CN100426616C - Protective relay device - Google Patents

Abstract

The invention aims to eliminate a point of an accident without fail even in the case of an accident in a protection interval that occurs during system swing at the time of an open phase and protect an electric power system with respect to a protective relay system in the electric power system. The swing detection circuit (PSB) 11 detects swing in an electric power system, and an open-phase state detection circuit (LOP) 12 detects an open-phase state. A negative-phase change component directional relay (forward determination element) (DI2-D(F)) 13F operates by determining an accident in the direction of protection (forward direction). Outputs of these circuits and the relay are inputted to an AND circuit 15. Only when a system accident occurs during system swing (PSB in operation) in the open-phase state (LOP in operation) and the system accident is determined to be located forward from the relevant terminal (substation) (DI2-D(F) activated), a trip permission signal 16t is transmitted to a target terminal, and a circuit breaker trip signal 19 is outputted.

Description

The protection relay system

Technical field

The present invention relates to a kind of protection relay system, even if in the swing of following the electric power system phase shortage, during the generation accident, also can positively remove accident point, the protection electric power system.

Background technology

The protection relay system of protection electric power system is judged the accident that produces in the object of protection scope of electric power system, make the disconnect action, cuts off this accident part.This protection relay system calculates the range finding impedance according to voltage, electric current that the converting equipment of electric power system is imported, has zone (load area) according to it, judges whether it is the interior accident of object of protection scope.In addition, under the situation of the accident in the object of protection scope, send (trip) signal that opens circuit to disconnect.

Figure 27 is expression based in the existence zone (load area) of the range finding impedance Z that perfects the trend under the load condition of electric power system, detect the figure of the relation of key element (mho characteristic, ohm property) with the accident direction.

Like this, under sound load condition, the existence zone (load area) of the range finding impedance of trend is present on the position of the operating space that leaves accident direction detection key element (mho characteristic, ohm property).Therefore, mho relay, eyeshade (Block ラ イ Application ダ) relay can not carried out the action of unwanted detection accident.

But big if the trend of electric power system becomes, the impedance of then finding range detects the operating space of key element near the accident direction.Therefore, produce under the situation of swing in electric power system, enter the operating space that the accident direction detects key element, although be not accident, relay moves without reason sometimes, disconnect occurs and opens circuit.

Therefore, when electric power system is swung, detect this dancing usually, locking comprises the action output that the accident direction detects the distance relay of key element.

Basic structure in the past is, when the swing of one-time detection electric power system, after this action output of locking distance relay even if under the situation of accident, also continue the action output locking (value before keeping) of distance relay in the guard interval of electric wire is sent in generation.But, this means the accident in the guard interval in system's swing is failure to actuate mistakenly.

Make by the accident in the swing of this system and to send the wire protective relay-set to move in the situation about disposing; the level of the with good grounds zero-phase-sequence current that takes place to be produced because of accident, negative-phase sequence current etc. comes the mode of the action output locking of de-preservation relay system.But under this mode, owing to do not consider the selectivity of accident direction, the protection relay system might carry out waste motion to the accident of guard interval outside.

In recent years, even if the accident in the only accurate open circuit protection interval is also thought in strong request in system's swing.As applicant of the present invention shown in " the protection relay system " of August 27 calendar year 2001 application; propose following method; the uneven composition of the voltage and current that utilization is measured to from electric power system extracts for example negative-phase sequence composition, the direction of correctly judgement accident (for example with reference to patent documentation 1).

But, so utilizing the imbalance of measuring voltage, electric current to become to assign in the method for judgement accident direction, under the situation that often has uneven composition, this imbalance composition itself becomes reasons of error, has the wrongheaded problem of direction.The single-phase closed circuit more single-phase non-full-phase state in no-voltage time etc. is the representative instance that often has uneven composition.

At this situation, shown in " the digital form directional relay " of application on January 28th, 2002, also propose following method as same applicant, even if under the situation that often has uneven composition, also can judgement accident direction (for example with reference to patent documentation 2).

Patent documentation 1: the open 2003-070151 communique of Japan's special permission

Patent documentation 2: the open 2003-224928 communique of Japan's special permission

Summary of the invention

Under the present situation of this existing protection relay system, even if user side needs accident in the guard interval that produces in the system's swing when the phase shortage also removal accident fast.

The object of the present invention is to provide a kind of protection relay system, even if, also can positively remove accident point for the accident in the guard interval that produces in the swing of the system when the phase shortage, the protection electric power system.

Protection relay system of the present invention is being detected the electric power system swing by swing detection portion when, detected under the state of electric power system phase shortage by the phase shortage test section; having under the situation of the place ahead accident by negative-phase sequence (variable quantity) the place ahead accident judgement section judges; send the disconnect permission signal that opens circuit by the other side's terminals side of Department of Communication Force between the system protection terminal; in addition; open circuit and allows under the situation of signal receiving disconnect from the other side's terminals side by Department of Communication Force, export break signal to the disconnect of electric power system.

Therefore, even if in the swing of the system of non-full-phase state under the situation of generation accident, also can be only to correctly removal accident of inner accident.

Protection relay system of the present invention is being detected the electric power system swing by swing detection portion when, detected under the state of electric power system phase shortage by the phase shortage test section; having under the situation of the place ahead accident by negative-phase sequence (variable quantity) the place ahead accident judgement section judges, to the disconnect output break signal of electric power system.

Therefore, even if in the swing of the system of non-full-phase state under the situation of generation accident, also can be only to correctly removal accident of the place ahead accident.

Protection relay system of the present invention is being detected the electric power system swing by swing detection portion when, detected under the state of electric power system phase shortage by the phase shortage test section; having under the situation of the place ahead accident by zero phase-sequence (variable quantity) the place ahead accident judgement section judges; send the disconnect permission signal that opens circuit by the other side's terminals side of Department of Communication Force between the system protection terminal; in addition; open circuit and allows under the situation of signal receiving disconnect from the other side's terminals side by Department of Communication Force, export break signal to the disconnect of electric power system.

Therefore, even if in the swing of the system of non-full-phase state, produce under the situation of inner ground fault, also correctly removal accident.

Protection relay system of the present invention is being detected the electric power system swing by swing detection portion when, detected under the state of electric power system phase shortage by the phase shortage test section; having under the situation of the place ahead accident by zero phase-sequence (variable quantity) the place ahead accident judgement section judges, to the disconnect output break signal of electric power system.

Therefore, even if in the swing of the system of non-full-phase state, produce under the situation of the place ahead ground fault, also correctly removal accident.

Protection relay system of the present invention is when detecting the electric power system swing by swing detection portion; detect by the phase shortage test section under the state of electric power system phase shortage; judge have under the situation of the place ahead accident at least one side by negative-phase sequence (variable quantity) the place ahead accident judging part and zero phase-sequence (variable quantity) the place ahead accident judging part; send the disconnect permission signal that opens circuit by the other side's terminals side of Department of Communication Force between the system protection terminal; in addition; open circuit and allows under the situation of signal receiving disconnect from the other side's terminals side by Department of Communication Force, export break signal to the disconnect of electric power system.

Therefore, in the swing of the system of non-full-phase state, produce under the situation of inner accident, can be only to the correctly removal accident of the inner accident of whole imbalances of ground fault and short circuit accident.

Protection relay system of the present invention is being detected the electric power system swing by swing detection portion when, detected under the state of electric power system phase shortage by the phase shortage test section; judge have under the situation of the place ahead accident at least one side, to the disconnect output break signal of electric power system by negative-phase sequence (variable quantity) the place ahead accident judging part and zero phase-sequence (variable quantity) the place ahead accident judging part.

Therefore, in the swing of the system of non-full-phase state, produce under the situation of inner accident, can be only to the correctly removal accident of the inner accident of whole imbalances of ground fault and short circuit accident.

Protection relay system of the present invention is being detected the electric power system swing by swing detection portion when, detected under the state of electric power system phase shortage by the phase shortage test section; detecting each three-phase current value by the current unbalance test section under the unbalance situation more than the adjusted value, to the disconnect output break signal of electric power system.

Therefore, even if in the electric power swing detection of non-full-phase state, under the situation of generation accident, also can detect the unbalance part of the electric current that produces because of this accident, removal accident positively.

Protection relay system of the present invention is when detecting the electric power system swing by swing detection portion; detect by the phase shortage test section under the state of electric power system phase shortage; receive by Department of Communication Force from the object of protection the other side's terminals side between relative terminal disconnect to this terminals side open circuit allow signal in; by negative-phase sequence (variable quantity) rear accident judgement section judges not with the situation of the rightabout accident of system protection direction under; send the disconnect permission signal that opens circuit by described Department of Communication Force from this terminal side direction the other side terminals side between described relative terminal; simultaneously, export break signal to the disconnect of electric power system.

Therefore, even if in the electric power swing detection of non-full-phase state near to square end under the situation of the place ahead accident judging part akinesia of generation accident and local terminal, as long as receive the permission signal that opens circuit from the other side's termination, then affirmation does not have the judgement based on the rear accident of negative-phase sequence variable quantity, can carry out disconnect and open circuit removal accident correctly.

Protection relay system of the present invention is when detecting the electric power system swing by swing detection portion; detect by the phase shortage test section under the state of electric power system phase shortage; receive by Department of Communication Force from the object of protection the other side's terminals side between relative terminal disconnect to this terminals side open circuit allow signal in; by zero phase-sequence (variable quantity) rear accident judgement section judges not with the situation of the rightabout accident of system protection direction under; send the disconnect permission signal that opens circuit by described Department of Communication Force from this terminal side direction the other side terminals side between described relative terminal; simultaneously, export break signal to the disconnect of electric power system.

Therefore, even if in the electric power swing detection of non-full-phase state near to square end under the situation of the place ahead accident judging part akinesia of generation accident and local terminal, as long as receive the permission signal that opens circuit from the other side's termination, then affirmation does not have the judgement based on the rear accident of zero phase-sequence variable quantity, can carry out disconnect and open circuit removal accident correctly.

Protection relay system of the present invention is when detecting the electric power system swing by swing detection portion; detect by the phase shortage test section under the state of electric power system phase shortage; receive by Department of Communication Force from the object of protection the other side's terminals side between relative terminal disconnect to this terminals side open circuit allow signal in; judge not under the situation with the rightabout accident of system protection direction by negative-phase sequence (variable quantity) rear accident judging part and zero phase-sequence (variable quantity) rear accident judging part both sides; send the disconnect permission signal that opens circuit by described Department of Communication Force from this terminal side direction the other side terminals side between described relative terminal; simultaneously, export break signal to the disconnect of electric power system.

Therefore, even if in the electric power swing detection of non-full-phase state near to square end under the situation of the place ahead accident judging part akinesia of generation accident and local terminal, as long as receive the permission signal that opens circuit from the other side's termination, then affirmation does not have the judgement based on the rear accident of negative-phase sequence variable quantity and zero phase-sequence variable quantity, can carry out disconnect and open circuit removal accident correctly.

Protection relay system of the present invention is being detected the electric power system swing by swing detection portion when, detected under the state of electric power system phase shortage by the phase shortage test section; at the voltage that is detected electric power system by not enough voltage detection department is being under the situation below the adjusted value more than the certain hour, to the disconnect output break signal of electric power system.

Therefore, even if in the electric power swing detection of non-full-phase state, under generation accident and local terminal and the situation that the place ahead accident judging part of square end is not moved,, then can carry out disconnect and open circuit removal accident positively as long as voltage continues to descend.

Protection relay system of the present invention is when detecting the electric power system swing by swing detection portion; detect by the phase shortage test section under the state of electric power system phase shortage; under the situation of the accident that the system protection direction is arranged by negative-phase sequence (variable quantity) the place ahead accident judgement section judges; or detect each three-phase current value under the unbalance situation more than the adjusted value by the current unbalance test section; or receive by Department of Communication Force from the object of protection the other side's terminals side between relative terminal disconnect to this terminals side open circuit allow signal in; by negative-phase sequence (variable quantity) rear accident judgement section judges not with the situation of the rightabout accident of system protection direction under; or the voltage that detects electric power system by not enough voltage detection department more than the certain hour under the situation below the adjusted value; send the disconnect permission signal that opens circuit by described Department of Communication Force from this terminal side direction the other side terminals side between described relative terminal; simultaneously; when the disconnect of reception from the other side's terminals side to this terminals side opens circuit the permission signal, to the disconnect output break signal of electric power system.

Therefore, the negative-phase sequence variable quantity the place ahead accident judgement section judges by local terminal in the electric power swing detection of non-full-phase state has under the situation of the accident of protecting direction, can carry out disconnect and open circuit.In addition; even if under the situation of the accident that the protection direction can not be arranged by negative-phase sequence variable quantity the place ahead accident judgement section judges of local terminal; as long as confirm electric current unbalance, receive to open circuit from the other side's termination and allow signal, voltage to continue degradation down; then also can finally carry out disconnect and open circuit, correctly removal accident positively.

The protection relay system of protection relay system of the present invention; to negative-phase sequence (variable quantity) rear accident judgement section judges is to have with the judgement output of the rightabout accident of system protection direction to carry out exporting after the 1st time delay; simultaneously; after through the 1st time, continue output, till the 2nd time.In addition, continue that output has and the judgement period of output of the rightabout accident of this system protection direction between, stop negative-phase sequence (variable quantity) the place ahead accident judgement section judges that the judgement output of the accident of system protection direction is arranged.

Therefore, the laggard behaviour of generation rear accident is die and is removed, and because the trend of following this accident to remove is reversed and is judged as mistakenly under the situation that has the place ahead accident, can open circuit in certain prevention of the 2nd time disconnect mistake.And, because the influence that the place ahead accident produces and false judgment has under the situation of rear accident, do not stop disconnect to open circuit in the 1st time, and make negative-phase sequence (variable quantity) the place ahead accident judgement section judges have the judgement of the place ahead accident effective, can carry out disconnect really opens circuit, all false judgment to the place ahead accident and rear accident are taken measures removal accident correctly respectively.

Protection relay system of the present invention; to zero phase-sequence (variable quantity) rear accident judgement section judges is to have with the judgement output of the rightabout accident of system protection direction to carry out exporting after the 1st time delay; simultaneously, after through the 1st time, continue output, till the 2nd time.In addition, continue that output has and the judgement period of output of the rightabout accident of this system protection direction between, stop zero phase-sequence (variable quantity) the place ahead accident judgement section judges that the judgement output of the accident of system protection direction is arranged.

Therefore, the laggard behaviour of generation rear accident is die and is removed, and because the trend of following this accident to remove is reversed and is judged as mistakenly under the situation that has the place ahead accident, can open circuit in certain prevention of the 2nd time disconnect mistake.And, because the influence that the place ahead accident produces and false judgment has under the situation of rear accident, do not stop disconnect to open circuit in the 1st time, and make zero phase-sequence (variable quantity) the place ahead accident judgement section judges have the judgement of the place ahead accident effective, can carry out disconnect really opens circuit, all false judgment to the place ahead accident and rear accident are taken measures removal accident correctly respectively.

Protection relay system of the present invention; to negative-phase sequence (variable quantity) rear accident judging part and zero phase-sequence (variable quantity) rear accident judgement section judges is to have with the judgement output of the rightabout accident of system protection direction to carry out exporting after the 1st time delay; simultaneously; after through the 1st time, continue output, till the 2nd time.In addition; continue that output has and the judgement period of output of the rightabout accident of this system protection direction between, stop negative-phase sequence (variable quantity) the place ahead accident judging part and zero phase-sequence (variable quantity) the place ahead accident judgement section judges that the judgement output of the accident of system protection direction is arranged.

Therefore, have under the situation of the place ahead accident, can stop the disconnect mistake to open circuit really in the 2nd time in the trend counter-rotating false judgment of removing because of the accident of following the rear accident to cause.And, because the influence that the place ahead accident produces and false judgment has under the situation of rear accident, do not stop disconnect to open circuit in the 1st time, and make negative-phase sequence (variable quantity) the place ahead accident judging part and zero phase-sequence (variable quantity) the place ahead accident judgement section judges have the judgement of the place ahead accident effective, can carry out disconnect really opens circuit, all false judgment to the place ahead accident and rear accident are taken measures removal accident correctly respectively.

The invention effect

According to protection relay system of the present invention, even if in the swing of the system of non-full-phase state under the situation of generation accident, also can be only to correctly removal accident of inner accident.

According to protection relay system of the present invention, even if in the swing of the system of non-full-phase state under the situation of generation accident, also can be only to correctly removal accident of the place ahead accident.

According to protection relay system of the present invention, even if in the swing of the system of non-full-phase state, produce under the situation of inner ground fault, also correctly removal accident.

According to protection relay system of the present invention, even if in the swing of the system of non-full-phase state, produce under the situation of the place ahead ground fault, also correctly removal accident.

According to protection relay system of the present invention, in the swing of the system of non-full-phase state, produce under the situation of inner accident, can be only to the correctly removal accident of the inner accident of whole imbalances of ground fault and short circuit accident.

According to protection relay system of the present invention, in the swing of the system of non-full-phase state, produce under the situation of inner accident, can be only to the correctly removal accident of the inner accident of whole imbalances of ground fault and short circuit accident.

According to protection relay system of the present invention, even if in the electric power swing detection of non-full-phase state, under the situation of generation accident, also can detect the unbalance part of the electric current that produces because of this accident, removal accident positively.

According to protection relay system of the present invention; even if in the electric power swing detection of non-full-phase state near to square end under the situation of the place ahead accident judging part akinesia of generation accident and local terminal; as long as receive the permission signal that opens circuit from the other side's termination; then affirmation does not have the judgement based on the rear accident of negative-phase sequence variable quantity; can carry out disconnect and open circuit removal accident correctly.

According to protection relay system of the present invention; even if in the electric power swing detection of non-full-phase state near to square end under the situation of the place ahead accident judging part akinesia of generation accident and local terminal; as long as receive the permission signal that opens circuit from the other side's termination; then affirmation does not have the judgement based on the rear accident of zero phase-sequence variable quantity; can carry out disconnect and open circuit removal accident correctly.

According to protection relay system of the present invention; even if in the electric power swing detection of non-full-phase state near to square end under the situation of the place ahead accident judging part akinesia of generation accident and local terminal; as long as receive the permission signal that opens circuit from the other side's termination; then affirmation does not have the judgement based on the rear accident of negative-phase sequence variable quantity and zero phase-sequence variable quantity; can carry out disconnect and open circuit removal accident correctly.

According to protection relay system of the present invention; even if in the electric power swing detection of non-full-phase state under generation accident and local terminal and the situation that the place ahead accident judging part of square end is not moved; as long as voltage continues to descend, then can carry out disconnect and open circuit removal accident positively.

According to protection relay system of the present invention, the negative-phase sequence variable quantity the place ahead accident judgement section judges by local terminal in the electric power swing detection of non-full-phase state has under the situation of the accident of protecting direction, can carry out disconnect and open circuit.In addition; even if under the situation of the accident that the protection direction can not be arranged by negative-phase sequence variable quantity the place ahead accident judgement section judges of local terminal; as long as confirm electric current unbalance, receive to open circuit from the other side's termination and allow signal, voltage to continue degradation down; then also can finally carry out disconnect and open circuit, correctly removal accident positively.

According to protection relay system of the present invention; further; the laggard behaviour of generation rear accident is die and is removed, and because the trend of following this accident to remove is reversed and is judged as mistakenly under the situation that has the place ahead accident, can open circuit in certain prevention of the 2nd time disconnect mistake.And, because the influence that the place ahead accident produces and false judgment has under the situation of rear accident, do not stop disconnect to open circuit, and make negative-phase sequence (variable quantity) the place ahead accident judgement section judges have the judgement of the place ahead accident effective, can carry out disconnect really and open circuit in the 1st time.Thereby, all false judgment of the place ahead accident and rear accident are taken measures removal accident correctly respectively.

According to protection relay system of the present invention; further; the laggard behaviour of generation rear accident is die and is removed, and because the trend of following this accident to remove is reversed and is judged as mistakenly under the situation that has the place ahead accident, can open circuit in certain prevention of the 2nd time disconnect mistake.And, because the influence that the place ahead accident produces and false judgment has under the situation of rear accident, do not stop disconnect to open circuit, and make zero phase-sequence (variable quantity) the place ahead accident judgement section judges have the judgement of the place ahead accident effective, can carry out disconnect really and open circuit in the 1st time.Thereby, all false judgment of the place ahead accident and rear accident are taken measures removal accident correctly respectively.

According to protection relay system of the present invention; further; the laggard behaviour of generation rear accident is die and is removed, and because the trend of following this accident to remove is reversed and is judged as mistakenly under the situation that has the place ahead accident, can open circuit in certain prevention of the 2nd time disconnect mistake.And, because the influence that the place ahead accident produces and false judgment has under the situation of rear accident, do not stop disconnect to open circuit in the 1st time, and make negative-phase sequence (variable quantity) the place ahead accident judging part and zero phase-sequence (variable quantity) the place ahead accident judgement section judges have the judgement of the place ahead accident effective, can carry out disconnect really and open circuit.Thereby, all false judgment of the place ahead accident and rear accident are taken measures removal accident correctly respectively.

Therefore,, can provide a kind of protection relay system according to the present invention, even if, also can positively remove accident point for the accident in the guard interval that produces in the swing of the system when the phase shortage, the protection electric power system.

Description of drawings

Fig. 1 is the structure chart that expression is provided with the electric power system of protection relay system.

Fig. 2 is the internal logic figure of the protection relay system of expression the present invention the 1st execution mode.

Fig. 3 is the impedance operator figure of expression when utilizing mho relay (Mho) 22 to come the detection system swing with difference operate time of skew mho relay (O-Mho) 21.

Fig. 4 is the structure chart of expression wobble detection circuit (PSB) 11.

Fig. 5 is the internal logic figure that expression utilizes the non-full-phase state testing circuit (LOP) 12 of overcurrent relay (OC-High) 31H, (OC-Low) 31L.

Fig. 6 is that expression is judged actuating range figure corresponding to the accident of the phase relation of negative-phase sequence variable quantity voltage Δ V2 and negative-phase sequence variable quantity electric current Δ I2.

Fig. 7 is that expression is judged actuating range figure corresponding to the accident of the variation 1 of the phase relation of negative-phase sequence variable quantity voltage Δ V2 and negative-phase sequence variable quantity electric current Δ I2.

Fig. 8 is that expression is judged actuating range figure corresponding to the accident of the variation 2 of the phase relation of negative-phase sequence variable quantity voltage Δ V2 and negative-phase sequence variable quantity electric current Δ I2.

Fig. 9 is the structure chart that expression is provided with the electric power system of the protection relay system that is not equipped with Department of Communication Force A, B.

Figure 10 is the internal logic figure that is not equipped with the protection relay system of Department of Communication Force A, B in expression the present invention the 1st execution mode.

Figure 11 is the internal logic figure of the protection relay system of expression the present invention the 2nd execution mode.

Figure 12 is that expression is judged actuating range figure corresponding to the accident of the phase relation of zero phase-sequence variable quantity voltage Δ V0 and zero phase-sequence variable quantity electric current Δ I0.

Figure 13 is the internal logic figure that is not equipped with the protection relay system of Department of Communication Force A, B in expression the present invention the 2nd execution mode.

Figure 14 is the internal logic figure of the protection relay system of expression the present invention the 3rd execution mode.

Figure 15 is the internal logic figure that is not equipped with the protection relay system of Department of Communication Force A, B in expression the present invention the 3rd execution mode.

Figure 16 is the internal logic figure of the protection relay system of expression the present invention the 4th execution mode.

Figure 17 be expression current unbalance detector (UNB) 43 carry out phase shortage the time the three-phase current that perfects phase poor (unbalance) detect the flow chart of step.

Figure 18 is the internal logic figure of the protection relay system of expression the present invention the 5th execution mode.

Figure 19 is the internal logic figure of the protection relay system of expression the present invention the 6th execution mode.

Figure 20 is the internal logic figure of the protection relay system of expression the present invention the 7th execution mode.

Figure 21 is the internal logic figure of the protection relay system of expression the present invention the 8th execution mode.

Figure 22 is the internal logic figure of the protection relay system of expression the present invention the 9th execution mode.

Figure 23 is the internal logic figure of the protection relay system of expression the present invention the 10th execution mode.

The structure chart of Figure 24 when to be expression with the no negative-phase sequence rear accident in the protection relay system of the present invention's the 10th execution mode confirm that circuit 53 is applicable to the protection relay system of the 9th execution mode.

Figure 25 is the internal logic figure of the protection relay system of expression the present invention the 11st execution mode.

Figure 26 is the internal logic figure of the protection relay system of expression the present invention the 12nd execution mode.

Figure 27 is expression based in the existence zone (load area) of the range finding impedance Z that perfects the trend under the load condition of electric power system, detect the graph of a relation of key element (mho characteristic, ohm property) with the accident direction.

Embodiment

Below, describe the execution mode of protection relay system of the present invention in detail with reference to accompanying drawing.

(the 1st execution mode)

The protection relay system of the 1st execution mode is described with reference to Fig. 1-Fig. 5.

Fig. 1 is the structure chart that expression is provided with the electric power system of protection relay system.

Among Fig. 1, TL is the electric wire that send as the object of protection of the A transformer station that connects electric power system, B transformer station.In each A of transformer station, B, the protection relay system Ry-A, the Ry-B that obtain electric current (I), voltage (V), execute protection computing by current transformer CT, transformer PT are set respectively.These protections relay system Ry-A, Ry-B use Department of Communication Force A, B to exchange each other to be used to the permission signal that opens circuit that allows the order of opening circuit of the other side's disconnect CB-B, CB-A.

Because protection relay system Ry-A, Ry-B structure are identical, so be that representative illustrates its internal structure with protection relay system Ry-A.

Fig. 2 is the internal logic figure of the protection relay system Ry-A of expression the present invention the 1st execution mode.

The 11st, wobble detection circuit (PSB).

System's swing detection method is recorded among No. 1 P65 of electric collaborative research the 37th volume.In view of the above, by catching the passing of locus of impedance, the mho relay (Mho) that detects key element as the different direction of active region is poor or two eyeshade pull up times are poor, the detection that executive system is swung with the operate time of skew mho relay (O-Mho).

Fig. 3 is the impedance operator figure of expression when utilizing mho relay (Mho) 22 to come the detection system swing with difference operate time of skew mho relay (O-Mho) 21.

Since system swing make under the situation that the track of impedance Z moves shown in arrow a, when t1, skew mho relay (O-Mho) 21 actions, when t2, mho relay (Mho) 22 actions.Under the time difference of t2-t1 is situation more than the adjusted value (setting value), be judged as system's swing (imbalance), lock the action of distance relay.In addition, open circuit, outside the track of impedance Z becomes the operating space of skew mho relay (O-Mho) 21, through removing the locking of distance relay after the certain hour in order to prevent mistake.

Fig. 4 is the structure chart of expression wobble detection circuit (PSB) 11.

Among Fig. 4, the 21st, skew mho relay (O-Mho), the 22nd, mho relay (Mho) 22,23rd, NOT circuit, the 24th, AND circuit.AND circuit 24 will be offset the action and being failure to actuate of mho relay (Mho) 22 of mho relay (O-Mho) 21 and set up as operation condition.

The 25th, as the delay timer (TDE) of confirming timer.Delay timer (TDE) 25 is exported " 1 " under the situation more than AND circuit 24 output " 1 " continuation T20 time of delay.

Promptly, the time difference t2-t1 of wobble detection circuit (PSB) 11 till the operating space that enters skew mho relay (O-Mho) 21 from system impedance Z plays the operating space that enters mho relay (Mho) 22, under the situation of stablizing (adjusting) time T 20 length than delay timer (TDE) 25, be judged as and produce swing in the electric power system, from this delay timer (TDE) 25 output system swing detection signals " 1 ".

In addition, under the situation that detects system's swing by this delay timer (TDE) 25, by making system's swing detection signal " 1 " continue the T21 time as the turn-off delay timer 26 that extends timer.

Thus, obtain PSB (the Power Swing Block) output of wobble detection circuit (PSB) 11.

Among Fig. 2, the 12nd, non-full-phase state testing circuit (LOP).

This non-full-phase state testing circuit (LOP) 12 can wait and detects non-full-phase state by obtaining each disconnect state in mutually of for example electric power system.

Under the situation that does not obtain described disconnect state, utilize overcurrent relay etc., can detect non-full-phase state.

Fig. 5 is the internal logic figure that expression utilizes the non-full-phase state testing circuit (LOP) 12 of overcurrent relay (OC-High) 31H, (OC-Low) 31L.

Among Fig. 5,31H, 31L are overcurrent relays.The operating value of overcurrent relay (OC-High) 31H is than the operating value height of overcurrent relay (OC-Low) 31L.32a, 32b, 32c are the AND circuit.Set up under each AND circuit 32a, 32b, the 32c situation that certain biphase current relay (OC-High) 31H action, remaining phase overcurrent relay (OC-Low) 31L are failure to actuate in 3 phases (A, B, C) of electric power system.

That is, each AND circuit 32a, 32b, 32c flow through to a certain degree electric current (OC-High) in mutually in 32 in mutually of electric power system, only one only flow through in mutually under the situation of the electric current (OC-Low) below the certain value and set up, and can detect phase shortage.The 33rd, the OR circuit, described AND circuit 32a, 32b, 32c arbitrary " with " under the situation that (and) condition is set up, finally detect phase shortage, obtain the LOP output of non-full-phase state testing circuit 12.

Among Fig. 2,13F is negative-phase sequence variable-quantity directional-relay (the place ahead accident judging part) (below be called negative-phase sequence the place ahead relay 13F), uses the negative-phase sequence variable quantity, judges the accident and the action of protection direction (the place ahead direction).The negative-phase sequence composition that this negative-phase sequence the place ahead relay 13F produces when only being extracted in accident, obtain negative-phase sequence variable quantity voltage Δ V2 and negative-phase sequence variable quantity electric current Δ I2, wait according to the phase relation of this negative-phase sequence variable quantity voltage Δ V2 and negative-phase sequence variable quantity electric current Δ I2 and judge the accident direction.

At first, for example obtain the negative-phase sequence amount of voltage by following formula (1).

3V _2m＝V _Am+V _B(m-8)+V _C(m-4)(1)

Here, m represents the sampling of current time.Below, establishing per 30 ° has data.Therefore, m-4 means the data before 120 °.

In addition, for example obtain the negative-phase sequence amount of electric current by following formula (2).

3I _2m＝I _Am+I _B(m-8)+I _C(m-4)(2)

Below, for example obtain negative-phase sequence voltage value before 1 cycle becomes component voltage with the imbalance of the negative-phase sequence voltage value of current time variable quantity by following formula (3).

ΔV _2m＝V _2m-V _2(m-12)(3)

In addition, for example obtain the variable quantity of uneven composition electric current of the negative-phase sequence current value of negative-phase sequence current value before 1 cycle and current time by following formula (4).

ΔI _2m＝I _2m-I _2(m-12)(4)

In the present embodiment, obtain the negative-phase sequence composition earlier, obtain variable quantity again, even if but obtain variable quantity earlier to obtain the negative-phase sequence amount more also just the same.

In addition, judge the place ahead accident according to the phase relation of negative-phase sequence variable quantity voltage Δ V2 and negative-phase sequence variable quantity electric current Δ I2.When the impedance of considering negative-phase sequence is clockwise reactance substantially, then forwardly under the situation of accident, Δ I _2mRelatively-Δ V _2mPostpone about 90 °.Therefore, by with Δ I _2mMove forward 90 °, and get and-Δ V _2mInner product, can find the phase relation of negative-phase sequence variable quantity voltage Δ V2 and negative-phase sequence variable quantity electric current Δ I2.When being formulated, for example shown in the following formula (5).

ΔI _2m∠90°*(-ΔV _2m)≥k ₁|ΔV _2m?|(5)

According to this formula (5), with Δ I _2m90 ° of amounts of moving ahead multiply by-Δ V _2mThe composition that obtains becomes k ₁Under the above situation, judge action.

Fig. 6 is the figure of this judgement operating space of expression.

Fig. 6 is that expression is judged actuating range figure corresponding to the accident of the phase relation of negative-phase sequence variable quantity voltage Δ V2 and negative-phase sequence variable quantity electric current Δ I2.

Obtain inner product operation ([Δ I with following formula (6) _{90 ° of 2 ∠}* (Δ V _2m)]).

-ΔV _2m*ΔI _2m∠90°

＝-ΔV _2m·ΔJ _2m-ΔV _2(m-3)·ΔJ _2(m-3)(6)

Here, Δ J _2mBe with Δ I _2mMove forward variable quantity electric current after 90 ° is for example obtained by following formula (7).

$\mathrm{\Δ}{J}_{2m}=(\mathrm{\Δ}{I}_{2m}-2\mathrm{\Δ}{I}_{2m(m-2)}/\sqrt{}3---\left(7\right)$

Absolute value | Δ V _2m| for example obtain by following formula (8).

$\left|\mathrm{\Δ}{V}_{2m}\right|=\sqrt{{\left(\mathrm{\Δ}{V}_{2m}\right)}^2+{\left(\mathrm{\Δ}{V}_{2(m-3)}\right)}^2}---\left(8\right)$

The situation etc. that comprises resistance components R in negative-pahse-sequence impedance as long as the phase shift of electric current is changed, is altered to and judges that the best angle of sensitivity gets final product down, and the user can set.

Accident is judged the k in the formula (5) ₁Be the key element of determining to judge sensitivity, cooperate the condition of electric power system to determine.

By using the variable quantity of the so uneven composition electric parameters of negative-phase sequence variable quantity voltage Δ V2 and negative-phase sequence variable quantity electric current Δ I2, the influence of the electric parameters of the negative-phase sequence amount that can be difficult to be subjected to existing all the time (for example negative-phase sequence amount that produces because of the imbalance of non-full-phase state generation).In addition, the precision that direction that can the raising accident is judged.

In addition, though self-evident, phase-shifting voltages replaces dephased current, it is also identical to carry out the situation that accident judges.In addition, when obtaining the phase relation of negative-phase sequence variable quantity voltage Δ V2 and negative-phase sequence variable quantity electric current Δ I2,, also can carry out the apposition computing though carry out inner product operation with after 90 ° of certain electric parameters phase shifts.

(variation 1)

As the variation that the accident of negative-phase sequence the place ahead relay 13F of the 1st execution mode is judged, for example only carry out accident according to phase difference merely and judge.

As mentioned above, because forwardly in the accident ,-Δ V _2mWith Δ IV _2mBasically be same phase, so, then can judge by following formula (9) if its phase difference is made as Φ.

-ΔV _2m*ΔJ _2m

＝|-ΔV _2m||ΔJ _2m|cosφ≥|-ΔV _2m||ΔJ _2m|X (9)

At this moment, if X=0 judges that then actuating range is

$-\frac{\mathrm{\π}}{2}\≤\mathrm{\φ}\≤\frac{\mathrm{\π}}{2}$

If establish

$X=\frac{\sqrt{2}}{2},$

Then have

$-\frac{\mathrm{\π}}{4}\≤\mathrm{\φ}\≤\frac{\mathrm{\π}}{4}$

。Fig. 7 illustrates this judgement actuating range.

Fig. 7 is that expression is judged actuating range figure corresponding to the accident of the variation 1 of the phase relation of negative-phase sequence variable quantity voltage Δ V2 and negative-phase sequence variable quantity electric current Δ I2.

(variation 2)

In this variation 2, the operating space that the skew accident is judged.For example, if to judgement operating space shown in Figure 7-Δ V _2mMiddle substitution-(Δ V _2m-α Δ V _2m), then as shown in Figure 8, obtain being offset α Δ V _2mCharacteristic.In addition, α for example is a constant.

Fig. 8 is that expression is judged actuating range figure corresponding to the accident of the variation 2 of the phase relation of negative-phase sequence variable quantity voltage Δ V2 and negative-phase sequence variable quantity electric current Δ I2.

Here, on voltage direction, get the skew of judging operating space, but, then also can on the sense of current, be offset as if calculating to the swing of electric current executive system.

The determination methods of this negative-phase sequence the place ahead relay based on the 1st execution mode (DI2-D (F)) 13F is with basic identical on this aspect of phase difference of the variable quantity of the variable quantity of having negative-phase sequence current in mind and negative-phase sequence voltage based on the determination methods of variation 1, variation 2.

The 14th, single triggering (oneshort) timer.Described negative-phase sequence the place ahead relay 13F is in order to become the variable quantity of component voltage 3V2 and negative-phase sequence composition electric current I 2 to carry out computing according to the such negative-phase sequence of negative-phase sequence variable quantity voltage Δ V2 and negative-phase sequence variable quantity electric current Δ I2, even if in accident continues, the process certain hour also can move and reset.Therefore, this list triggering timing device 14 is when described negative-phase sequence the place ahead relay 13F judges the accident of the place ahead direction, is used to stablize this place ahead accident and judges that signal moves the extension timer of output.

The 15th, AND circuit (﹠amp; ).Each output signal of these AND circuit 15 described wobble detection circuit of input (PSB) 11, non-full-phase state testing circuit (LOP) 12, negative-phase sequence the place ahead relay 13F, (in the PSB action) generation systematic failures during only the system of (in the LOP action) swings under non-full-phase state, and judge that this systematic failures is during than the more close the place ahead of this terminal (transformer station) direction (DI2-D (f)), " with " condition sets up.

By this AND circuit 15 " with " condition sets up, send disconnect from dispensing device 16 to the other side's terminal (transformer station) B and open circuit and allow signal 16t.

The 17th, receiving system opens circuit when allowing signal 17r output signal " 1 " when receiving disconnect from the other side's terminal (transformer station) B.In addition, constitute the carrier wave transport unit by described dispensing device 16 and receiving system 17.

The 18th, AND circuit (﹠amp; ).AND circuit 18 will be respectively from the state of described receiving system 17, AND circuit 15 output signals " 1 ", promptly receiving disconnect from the other side's terminal (transformer station) B and open circuit and allow signal 17r and negative-phase sequence the place ahead relay 13F to be judged as than the more close the place ahead of this terminal (transformer station) A direction accident as condition, to the disconnect CB-A of this terminal (transformer station) A output break signal 19.

Therefore, only all be judged as under the situation of the place ahead accident, just may carry out disconnect and open circuit at the protection relay system Ry-A, the Ry-B that are positioned at guard interval A-B two ends.

As mentioned above, according to the protection relay system of the 1st execution mode, even if in the swing of the system of non-full-phase state under the situation of generation accident, also can be only to correctly removal accident of inner accident.

(other structure example of the 1st execution mode)

In addition; also can constitute in the swing detection of non-full-phase state in electric power system (in the LOP action) (in the PSB action); under the situation of the accident that detects protection direction (the place ahead) (DI2-D (F) action), do not wait for from opening circuit of square end being allowed signal 17r and carrying out disconnect and open circuit.

At this moment, as Fig. 9 and shown in Figure 10, at each protection relay system Ry-A, Ry-B each other, needn't be provided for exchanging the Department of Communication Force A, the B that open circuit and allow signal of the action that allows the other side's disconnect CB-B, CB-A.

Fig. 9 is the structure chart that expression is provided with the electric power system of the protection relay system that is not equipped with Department of Communication Force A, B.

Figure 10 is the internal logic figure that is not equipped with the protection relay system Ry-A of Department of Communication Force A, B in expression the present invention the 1st execution mode.

In view of the above, AND circuit (﹠amp; ) 15 each output signal by input wobble detection circuit (PSB) 11, non-full-phase state testing circuit (LOP) 12, negative-phase sequence the place ahead relay 13F, (in the PSB action) generation systematic failures during only the system of (in the LOP action) swings under non-full-phase state, and this systematic failures is judged as under the situation than (DI2-D (F) action) of the more close the place ahead of this terminal (transformer station) direction, " with " the condition establishment, to the disconnect CB-A of this terminal (transformer station) A output break signal 19.

Therefore, in system's swing of non-full-phase state, produce under the situation of the place ahead accident, can only correctly and immediately remove this place ahead accident.

(the 2nd execution mode)

The protection relay system of the 2nd execution mode is described with reference to Figure 11.

Figure 11 is the internal logic figure of the protection relay system Ry-A of expression the present invention the 2nd execution mode.

In the protection relay system of the 2nd execution mode shown in Figure 11, the negative-phase sequence the place ahead relay 13F in the protection relay system of the 1st execution mode shown in Figure 2 is replaced as zero phase-sequence the place ahead relay (zero phase-sequence variable-quantity directional-relay (the place ahead accident judging part)) 41F.

Zero phase-sequence the place ahead relay 41F uses the zero phase-sequence variable quantity to judge the accident and the action of protection direction (the place ahead direction).The zero phase-sequence composition that produces during only extraction accident of this zero phase-sequence the place ahead relay 41F, obtain zero phase-sequence variable quantity voltage Δ V0 and zero phase-sequence variable quantity electric current Δ I0, judge the accident direction according to the phase relation of this zero phase-sequence variable quantity voltage Δ V0 and zero phase-sequence variable quantity electric current Δ I0.

At first, voltage zero phase sequence amount and current zero phase sequence amount are for example come computing according to following formula (10) and (11).

3V _0m＝V _am+V _bm+V _cm (10)

3I _0m＝I _am+I _bm+I _cm (11)

In addition, voltage zero phase sequence variable quantity and current zero phase sequence variable quantity are obtained according to following formula (12) and (13), for example become the variable quantity of component voltage and uneven composition electric current as the imbalance with 1 cycle value before.

ΔI _0m＝I _0m-I _0(m-12)(12)

ΔV _0m＝V _0m-I _0(m-12)(13)

As for the accident determination methods of zero phase-sequence the place ahead relay 41F of the 2nd execution mode, identical with negative-phase sequence the place ahead relay 13F of the 1st execution mode of Fig. 2 except that using zero phase-sequence amount electric parameters to replace the negative-phase sequence amount electric parameters, so omit explanation.

Figure 12 is that expression is judged actuating range figure corresponding to the accident of the phase relation of zero phase-sequence variable quantity voltage Δ V0 and zero phase-sequence variable quantity electric current Δ I0.

So, by using the electric parameters of zero phase-sequence variable quantity, be difficult to the influence of the electric parameters of the zero phase-sequence amount (for example zero phase-sequence amount that produces because of imbalance) that is subjected to existing all the time in the non-full-phase state generation.Compare judgement precision that can raising accident direction with only using the zero phase-sequence amount.For example, under the situation that produces ground fault, use zero phase-sequence can detect high sensitivity sometimes.In addition, comparing with negative-phase sequence, the influence of accident more is prone in the electric power system of zero phase-sequence etc., is suitable for protection relay system shown in the 2nd execution mode, that use the zero phase-sequence variable quantity.As other advantage, the computing of zero phase-sequence amount is not free to be postponed.Therefore, be difficult to be subjected to the influence of frequency variation.

As mentioned above, according to the protection relay system of the 2nd execution mode, even if in the swing of the system of non-full-phase state, produce under the situation of inner ground fault, also correctly removal accident.

(other structure example of the 2nd execution mode)

In addition; also can constitute; in the swing detection of the non-full-phase state of electric power system (in the LOP action) (in the PSB action); under the situation of the accident that detects protection direction (the place ahead) (DI0-D (F) action), do not wait for from opening circuit of square end being allowed signal 17r and carrying out disconnect and open circuit.

At this moment, as Fig. 9 and shown in Figure 13, at each protection relay system Ry-A, Ry-B each other, needn't be provided for exchanging the Department of Communication Force A, the B that open circuit and allow signal of the action that allows the other side's disconnect CB-B, CB-A.

Figure 13 is the internal logic figure that is not equipped with the protection relay system Ry-A of Department of Communication Force A, B in expression the present invention the 1st execution mode.

In view of the above, AND circuit (﹠amp; ) 15 each output signal by input wobble detection circuit (PSB) 11, non-full-phase state testing circuit (LOP) 12, zero phase-sequence the place ahead relay 41F, (in the PSB action) generation systematic failures during only the system of (in the LOP action) swings under non-full-phase state, and this systematic failures is judged as under the situation than (DI0-D (F) action) of the more close the place ahead of this terminal (transformer station) direction, " with " the condition establishment, to the disconnect CB-A of this terminal (transformer station) A output break signal 19.

Therefore, in system's swing of non-full-phase state, produce under the situation of the place ahead ground fault, can only correctly and immediately remove this place ahead ground fault.

(the 3rd execution mode)

The protection relay system of the 3rd execution mode is described with reference to Figure 14.

Figure 14 is the internal logic figure of the protection relay system Ry-A of expression the present invention the 3rd execution mode.

In the protection relay system of the 3rd execution mode shown in Figure 14, different with zero phase-sequence the place ahead relay 41F of the protection relay system of the 2nd execution mode shown in Figure 11, add negative-phase sequence the place ahead relay 13F is in parallel by OR circuit 42.

That is, (in the PSB action) by zero phase-sequence the place ahead relay (DI0-D (F)) 41F or negative-phase sequence the place ahead relay (DI2-D (F)) arbitrary action of 13F, can be carried out disconnect and open circuit in system's swing of non-full-phase state (in the LOP action).

Though in only judging according to the direction of the zero phase-sequence variable quantity of zero phase-sequence the place ahead relay 41F, can not carry out direction to the short circuit accident of not following ground connection judges, but by adding the negative-phase sequence the place ahead relay 13F that judges with negative-phase sequence variable quantity travel direction, as the OR condition, can judge the whole uneven accident of ground fault and short circuit accident in high sensitivity.

In addition, the same with the 1st execution mode or the 2nd execution mode, by using the electric parameters of negative-phase sequence variable quantity or zero phase-sequence variable quantity, be difficult to the influence of the electric parameters of the negative-phase sequence amount that is subjected to existing all the time or zero phase-sequence amount (for example the imbalance that produces by non-full-phase state and the negative-phase sequence amount or the zero phase-sequence amount that produce).Compare judgement precision that can raising accident direction with only using negative-phase sequence amount or zero phase-sequence amount.

As mentioned above, according to the protection relay system of the 3rd execution mode, when in the swing of the system of non-full-phase state, producing under the situation of inner accident, can be only to the correctly removal accident of the inner accident of whole imbalances of ground fault and short circuit accident.

(other structure example of the 3rd execution mode)

In addition; also can constitute in the swing detection of non-full-phase state in electric power system (in the LOP action) (in the PSB action); under the situation of the accident that detects protection direction (the place ahead) (DI2-D (F) action or DI0-D (F) action), do not wait for from opening circuit of square end being allowed signal 17r and carrying out disconnect and open circuit.

At this moment, as Fig. 9 and shown in Figure 15, at each protection relay system Ry-A, Ry-B each other, needn't be provided for exchanging the Department of Communication Force A, the B that open circuit and allow signal of the action that allows the other side's disconnect CB-B, CB-A.

Figure 15 is the internal logic figure that is not equipped with the protection relay system Ry-A of Department of Communication Force A, B in expression the present invention the 3rd execution mode.

In view of the above, AND circuit (﹠amp; ) 15 by input wobble detection circuit (PSB) 11, each output signal of non-full-phase state testing circuit (LOP) 12 and the OR output signal of negative-phase sequence the place ahead relay 13F and zero phase-sequence the place ahead relay 41F, (in the PSB action) generation systematic failures during only the system of (in the LOP action) swings under non-full-phase state, and this systematic failures is judged as under the situation than (DI2-D (F) action or DI0-D (F) action) of the more close the place ahead of this terminal (transformer station) direction, " with " the condition establishment, to the disconnect CB-A of this terminal (transformer station) A output break signal 19.

Therefore, in system's swing of non-full-phase state, produce under the situation of the place ahead accident, can only correctly and immediately remove whole uneven the place ahead accident of ground fault and short circuit accident.

(the 4th execution mode)

The protection relay system of the 4th execution mode is described with reference to Figure 16.

Figure 16 is the internal logic figure of the protection relay system Ry-A of expression the present invention the 4th execution mode.

In the protection relay system of the 4th execution mode, the negative-phase sequence the place ahead relay 13F in the protection relay system of the 1st execution mode shown in Figure 2 is replaced as current unbalance detects relay (OC-UNB) 43.

Figure 17 be expression current unbalance detector (OC-UNB) 43 carry out phase shortage the time the difference between current (unbalance) of phase of not phase shortage detect the flow chart of step.

At first, obtain the effective value (step S1) of electric current 3 phase components.

Obtain maximum and the 2nd value (step S2) greatly in the effective value of this 3 phase current.

Obtain value poor of the maximum of 3 phase currents and the 2nd big value, if this value is bigger than adjusted value K, then output " 1 " (step S3 → S4),, then export " 0 " if below the adjusted value K.

If minimum value is in the phase shortage mutually in the current effective value of 3 phases, then be judged as and be essentially " 0 ", the difference that remains two means generation accident in system greatly, and produces unbalance.Other parts are identical with Fig. 2, so omit explanation.

In view of the above, detect under the situation of (PSB action) swing down,, carry out disconnect and open circuit by the unbalance detection (OC-UNB action) of electric current at non-full-phase state (in the LOP action).

As mentioned above, according to the protection relay system of the 4th execution mode, in the electric power swing detection of non-full-phase state, under the situation of generation accident, detect the unbalance amount of the electric current that produces because of this accident, removal accident positively.

In addition, in the swing detection of the non-full-phase state of electric power system (in the LOP action) (in the PSB action), under the situation that detects current unbalance (OC-UNB action), probabilistic determination that can be high is the generation accident, so can constitute receiving system 17 is not set yet, does not wait for from opening circuit of square end being allowed signal 17r and carrying out disconnect and open circuit.

(the 5th execution mode)

The protection relay system of the 5th execution mode is described with reference to Figure 18.

Figure 18 is the internal logic figure of the protection relay system Ry-A of expression the present invention the 5th execution mode.

In the protection relay system of the 5th execution mode, except that the structure of the protection relay system of the 1st execution mode shown in Figure 2, also use negative-phase sequence variable-quantity directional-relay (rear accident judging part) (below be called negative-phase sequence rear relay 13R), single triggering timing device 44, NOT circuit 45, AND circuit (﹠amp; ) 46, OR circuit 47.

Negative-phase sequence rear relay 13R is the same with negative-phase sequence the place ahead relay 13F, according to the phase relation of negative-phase sequence variable quantity voltage Δ V2 and negative-phase sequence variable quantity electric current Δ I2, judges the rear accident opposite with the protection direction (the place ahead) of electric power system.

But,, judge by following formula (14) because be and the rightabout judgement of the place ahead accident.

ΔI _2m∠90°*(-ΔV _2m)＜k ₂|ΔV _2m|(14)

According to this formula (14), with Δ I _2mAdvance 90 ° amount and-Δ V _2mThe not enough k of composition of gained multiplies each other ₂Situation under, judge action.

Fig. 6 illustrates this judgement operating space.

Because just the same when the explanation of concrete operation method and the judgement of the place ahead accident, so omit.

Accident is judged the k in the formula (14) ₂Be the key element of determining to judge sensitivity, cooperate the condition of electric power system to determine.

Single triggering timing device 44 is when described negative-phase sequence rear relay 13R judges the rear accident, is used to stablize this rear accident and judges that signal moves the extension timer of output.The output of this list triggering timing device 44 is input to AND circuit 46 through NOT circuit 45.

Also the disconnect from the other side's terminal (transformer station) B that is received by receiving system 17 to 46 inputs of this AND circuit opens circuit and allows signal 17r.

Thus, AND circuit 46 does not judge that at described negative-phase sequence rear relay 13R the state (DI2-D (R)) of rear accident is failure to actuate) under, when output signal " 1 " is opened circuit when allowing signal 17r in receiving system 17 input from the disconnect of the other side's terminal (transformer station) B.

The output of this AND circuit 46 and the output-parallel of judging single triggering timing device 14 of action from the place ahead accident that prolongs described negative-phase sequence the place ahead relay 13F are imported in the described OR circuit 47.In addition, the non-full-phase state of exporting, reaching from described non-full-phase state testing circuit (LOP) 12 from the output and the system's swing detection from described wobble detection circuit (PSB) 11 of this OR circuit 47 detects output-parallel, imports described AND circuit 15.

Promptly, when in system's swing of non-full-phase state (in the LOP action) (PSB action), even if negative-phase sequence the place ahead relay 13F of this terminal (transformer station) B side does not judge the place ahead accident (DI2-D (F) is failure to actuate), as long as receiving disconnect from the other side's terminal (transformer station) B opens circuit and allows signal 17r, can confirm that also negative-phase sequence rear relay 13R does not judge rear accident (DI2-D (R) is failure to actuate), carries out disconnect and opens circuit.

As mentioned above; protection relay system according to the 5th execution mode; even if in the electric power swing detection of non-full-phase state near to square end the generation accident; under the situation that the directional relay of the negative-phase sequence variable quantity of local terminal (DI2-D (F)) fails to move; as long as receive the permission signal that opens circuit from the other side's termination; then can carry out disconnect and open circuit correctly removal accident.

In addition, the same with the 1st execution mode, by using the electric parameters of negative-phase sequence variable quantity, the influence of the electric parameters of the negative-phase sequence amount that is difficult to be subjected to existing all the time (for example the imbalance that produces because of non-full-phase state produce negative-phase sequence amount).

(the 6th execution mode)

The protection relay system of the 6th execution mode is described with reference to Figure 19.

Figure 19 is the internal logic figure of the protection relay system Ry-A of expression the present invention the 6th execution mode.

In the protection relay system of the 6th execution mode, negative-phase sequence the place ahead relay 13F in the protection relay system of the 5th execution mode shown in Figure 180 and negative-phase sequence rear relay 13R are replaced as zero phase-sequence the place ahead relay 41F and zero phase-sequence rear relay 41R.

The protection relay system of structure in addition and described the 5th execution mode is identical, so omit explanation.

Promptly, when in system's swing of non-full-phase state (in the LOP action) (PSB action), even if zero phase-sequence the place ahead relay 41F of this terminal (transformer station) B side does not judge the place ahead accident (DI0-D (F) is failure to actuate), as long as receiving disconnect from the other side's terminal (transformer station) B opens circuit and allows signal 17r, can confirm that also zero phase-sequence rear relay 41R does not judge rear accident (DI0-D (R) is failure to actuate), carries out disconnect and opens circuit.

As mentioned above; protection relay system according to the 6th execution mode; even if in the electric power swing detection of non-full-phase state near to square end the generation accident; under the situation that the directional relay of the zero phase-sequence variable quantity of local terminal (DI0-D (F)) does not move; as long as receive the permission signal that opens circuit from the other side's termination; then can carry out disconnect and open circuit correctly removal accident.

In addition, the same with the 2nd execution mode, by using the electric parameters of zero phase-sequence variable quantity, the influence of the electric parameters of the zero phase-sequence amount that is difficult to be subjected to existing all the time (for example the imbalance that produces because of non-full-phase state produce zero phase-sequence amount).

(the 7th execution mode)

The protection relay system of the 7th execution mode is described with reference to Figure 20.

Figure 20 is the internal logic figure of the protection relay system Ry-A of expression the present invention the 7th execution mode.

In the protection relay system of the 7th execution mode shown in Figure 20; zero phase-sequence the place ahead relay 41F with respect to the protection relay system in the 6th execution mode shown in Figure 19; come the negative-phase sequence the place ahead relay 13F that adds in parallel by OR circuit 42F; in addition, by OR circuit 42R that negative-phase sequence rear relay 13R is in parallel with zero phase-sequence rear relay 41R.

The protection relay system of structure in addition and described the 6th execution mode is identical, so omit explanation.

Promptly, when in system's swing of non-full-phase state (in the LOP action) (PSB action), even if zero phase-sequence the place ahead relay 41F of this terminal (transformer station) B side or negative-phase sequence the place ahead relay 13F do not judge the place ahead accident (DI0-D (F)+FI2-D (F) is failure to actuate), as long as receiving disconnect from the other side's terminal (transformer station) B opens circuit and allows signal 17r, can confirm that also zero phase-sequence rear relay 41R and negative-phase sequence rear relay 13R do not judge rear accident (DI0-D (R)+DI2-D (R) is failure to actuate), carry out disconnect and open circuit.

As mentioned above; protection relay system according to the 7th execution mode; even if in the electric power swing detection of non-full-phase state near to square end the generation accident; under the situation that the directional relay (DI2-D (F)) of directional relay of the zero phase-sequence variable quantity of local terminal (DI0-D (F)) and negative-phase sequence variable quantity does not all move; as long as receive the permission signal that opens circuit from the other side's termination; then can carry out disconnect and open circuit correctly removal accident.

In addition, the same with the 1st execution mode or the 2nd execution mode, by using the electric parameters of negative-phase sequence variable quantity or zero phase-sequence variable quantity, be difficult to the influence of the electric parameters of the negative-phase sequence amount that is subjected to existing all the time or zero phase-sequence amount (for example the imbalance that produces because of non-full-phase state produce negative-phase sequence amount or zero phase-sequence amount).

(the 8th execution mode)

The protection relay system of the 8th execution mode is described with reference to Figure 21.

Figure 21 is the internal logic figure of the protection relay system Ry-A of expression the present invention the 8th execution mode.

In the protection relay system of the 8th execution mode shown in Figure 21, add not enough voltage relay (UV2 mutually) 48 in parallel with wobble detection circuit (PSB) 11 and non-full-phase state testing circuit (LOP) 12, as the AND condition of AND circuit 15.

Not enough voltage relay (UV2 phase) 48 with electric power system 3 mutually in the not enough voltage relay of 1 phase of phase shortage to have moved be prerequisite, the phase voltage that detects residue 1 phase is that following or this voltage between lines of adjusted value is below the adjusted value.The output of this deficiency voltage relay (UV2 phase) 48 is through confirming the described AND circuit 15 of timer 49 inputs.

Confirm that timer 49 continues under the situation of T4 more than the time in the detection output " 1 " of not enough voltage relay (UV2 phase) 48, output signal " 1 ", also change decline owing in system's swing, perfect the voltage of phase, so prevent the misoperation that temporary transient voltage descends and causes.In addition, the standard of the affirmation time T 4 of affirmation timer 49 is made as more than the 300ms.

In addition, in the protection relay system of the 7th execution mode, be not equipped with from the receiving system 17 that opens circuit and allow signal to square end (transformer station) B.

Promptly, in system's swing of non-full-phase state (LOP action in) in (PSB action), as long as confirm the not enough voltage detection signal of output from described not enough voltage relay (UV2 phase) 48 through confirming timer 49, even if then do not receive, also can carry out disconnect and open circuit from the permission signal that opens circuit to square end (transformer station) B.

That is, in electric power system 3 mutually 1 mutually under the state of phase shortage, if confirm the undertension of residue 1 phase,, do not wait for from opening circuit of square end being allowed signal 17r and carrying out disconnect and open circuit then with high probabilistic determination generation accident.

As mentioned above; protection relay system according to the 8th execution mode; even if generation accident in the electric power swing detection of non-full-phase state; under the situation of not moving based on local terminal and accident direction judging part to the negative-phase sequence variable-quantity directional-relay of square end or zero phase-sequence variable-quantity directional-relay etc.; as long as continue voltage decline (UV2 moves mutually); then can carry out disconnect and open circuit removal accident positively.

Above-mentioned is that the voltage of system is obtained (PT) and is positioned at the situation of sending electric wire side with respect to disconnect, but under the situation of bus bar side, the action of not enough voltage relay mutually preferably with 1 as condition.

In addition, limiting according to CB conditioned disjunction electric current under the phase shortage phase situation in addition, also preferably will move and be made as 1 phase mutually.

(the 9th execution mode)

The protection relay system of the 9th execution mode is described with reference to Figure 22.

Figure 22 is the internal logic figure of the protection relay system Ry-A of expression the present invention the 9th execution mode.

In the protection relay system of the 9th execution mode shown in Figure 22; accident judging part with the current unbalance detector (OC-UNB) 43 shown in the 4th execution mode of Figure 16; negative-phase sequence rear relay 13R shown in the 5th execution mode of Figure 18 and its single triggering timing device (T3); the accident judging part that NOT circuit 45 and the AND circuit 46 that allows signal receiving device 17 of opening circuit are constituted; the accident judging part that not enough voltage relay shown in the 8th execution mode of Figure 21 (UV2 phase) 48 and affirmation timer 49 constitute; all as standby, the negative-phase sequence the place ahead relay 13F by the protection relay system in OR circuit 52 and the 1st execution mode shown in Figure 2 and the place ahead accident judging part that single triggering timing device (T2) 14 constitutes are in parallel.

At this moment, the same with affirmation timer (T4) 49 of not enough voltage relay (UV2 phase) 48, to the output additional affirmation timer (T5) 50 of current unbalance detector (OC-UNB) 43, to the output additional affirmation timer (T6) 51 of AND circuit 46.

Thus, even if detect under the situation of current unbalance at current unbalance detector (OC-UNB) 43, the constant time lag T5 time that disconnect is opened circuit, even if confirming under the state that negative-phase sequence rear relay (DI2-D (R)) 13R is failure to actuate, receiving under the situation of the permission signal 17r that opens circuit, the constant time lag T6 time that disconnect is opened circuit, even if not enough voltage relay (UV2 phase) 48 detects under the situation of voltage reduction, the constant time lag T4 time that disconnect is opened circuit.

During this confirms the detection acknowledging time of each accident of timer T4, T5, T6, judging under the situation of inner accident by negative-phase sequence the place ahead relay (DI2-D (F)) 13F, can carry out disconnect immediately and open circuit, have under the situation of outside accident, can expect to remove this accident.Therefore, no matter whether produce inner accident, in case negative-phase sequence the place ahead relay (DI2-D (F)) 13F does not carry out under the situation of judging action, or under the situation because of outside accident delay accident removal, the arbitrary standby accident judging part that all can pass through current unbalance detector (OC-UNB) 43, AND circuit 46, not enough voltage relay (UV2 phase) 48, carries out disconnect and opens circuit after the time at the timer of confirming timer T4, T5, T6.

In addition, as described in above-mentioned the 8th execution mode, not enough voltage relay 48 can be carried out 1 action mutually according to the condition difference, and the timer time T 4 for confirming timer 49 can be set in more than the 300ms.Can set the timer time T 4 of the affirmation timer 50 of current unbalance detector (OC-UNB) 43 for same degree, or consider the affirmation time that this current unbalance detector (OC-UNB) 43 can shorten accident by described not enough voltage relay (UV2 phase) 48, be set at 200ms.For the timer time T 6 of the affirmation timer 51 of AND circuit 46, because confirm no outside accident (DI2-D (R) is failure to actuate), so to carry out the possibility that disconnect opens circuit extremely low because of outside accident, it is so short to set 100ms for.

Promptly, in system's swing of non-full-phase state (LOP action in) in (PSB action), even if negative-phase sequence the place ahead relay 13F of this terminal (transformer station) B side does not judge the place ahead accident (DI2-D (F) is failure to actuate), as long as confirm current unbalance detector (OC-UNB) 43 judgement accidents or confirm reception open circuit allow signal 17r in, negative-phase sequence rear relay (DI2-D (R)) 13R do not judge the rear accident or confirms not enough voltage relay (UV2 phase) 48 judgement accidents, then can carry out disconnect and open circuit.

As mentioned above; protection relay system according to the 9th execution mode; under the situation of the directional relay of the negative-phase sequence variable quantity of local terminal in the electric power swing detection of non-full-phase state (DI2-D (F)) action; can carry out disconnect opens circuit; in addition; even if make in the timing that produces owing to accident etc. under the situation of directional relay (DI2-D (F)) akinesia of the negative-phase sequence variable quantity of this local terminal; as long as confirm the unbalance of electric current; reception is from the permission signal that opens circuit to square end; voltage reduces continuation etc.; then can finally carry out disconnect and open circuit, correctly removal accident positively.

In addition, the same with the 1st execution mode, by using the electric parameters of negative-phase sequence variable quantity, the influence of the electric parameters of the negative-phase sequence amount that is difficult to be subjected to existing all the time (for example the imbalance that produces because of non-full-phase state produce negative-phase sequence amount).

(the 10th execution mode)

The protection relay system of the 10th execution mode is described with reference to Figure 23.

Figure 23 is the internal logic figure of the protection relay system Ry-A of expression the present invention the 10th execution mode.

In the protection relay system of the 10th execution mode shown in Figure 23; by AND circuit 54, being failure to actuate of negative-phase sequence rear relay 13R confirmed that circuit (no negative-phase sequence rear accident is confirmed circuit) 53 adds with respect to negative-phase sequence the place ahead relay 13F of the protection relay system in the 1st execution mode shown in Figure 2 is in parallel.

No negative-phase sequence rear accident confirm circuit 53 by negative-phase sequence rear relay 13R, with the rear of this negative-phase sequence rear relay 13R judge output prolong single triggering timing device 55 of continuing the T1 time, should list triggering timing device 55 (the NOT circuit 45 that outputs to after T11＞delay timer 56 T12), the output of this delay timer 56 that reverses with the AND circuit 54 of described negative-phase sequence the place ahead relay (DI2-D (F)) 13F constitutes the output delay T12 time.

Thus, even if negative-phase sequence rear relay (DI2-D (R)) 13R judges action rear accident and exports from the signal of single triggering timing device 55 beginning time expand T11 that T12 time of delay of delay timer 56 also can continue the output from the affirmation signal of the no rear accident of NOT circuit 45.Therefore, as long as in time of delay T12, negative-phase sequence the place ahead relay (DI2-D (F)) 13F judges the place ahead accident, then can carry out disconnect and open circuit.In addition, after process T12 time of delay, during time expand T11, stop the disconnect of judging based on the place ahead accident of described negative-phase sequence the place ahead relay (DI2-D (F)) 13F to open circuit at least.Therefore, even if under the situation of the temporary transient erroneous judgement of negative-phase sequence rear relay (DI2-D (R)) the 13R side of having no progeny accident, as long as in time of delay T12, then judge the action useful effect based on the place ahead accident of negative-phase sequence the place ahead relay (DI2-D (F)) 13F, can carry out disconnect and open circuit.

Here, the time that the time expand T11 of described single triggering timing device 55 means under the situation that is detected the rear accident by negative-phase sequence rear relay (DI2-D (R)) 13R, the locking disconnect opens circuit, so consider the operate time of disconnect etc., be set in about 200ms-1s.T12 time of delay of delay timer 56 mean for example because under the situation of the place ahead accident (accident protection range in), negative-phase sequence rear relay (DI2-D (R)) 13R mistake carries out the time that accident is judged under the situation of action, the disconnect of prevention error lock object of protection opens circuit, so be set in about 20-40ms.

As mentioned above; protection relay system according to the 10th execution mode; in system's swing of non-full-phase state; detect the place ahead accident (DI2-D (F) action); confirm under the situation of no rear accident (DI2-D (R) is failure to actuate); all not only can positively carry out disconnect opens circuit; and; the laggard behaviour of rear accident (DI2-D (R) action) takes place dies and removes; reversing owing to the trend of following this accident to remove and detecting mistakenly under the situation of the place ahead accident (DI2-D (F) action); can carry out disconnect to mistake reliably opens circuit the locking T11 time; and; under the situation of error detection rear accident (DI2-D (R) action) owing to the influence of the place ahead accident generation (DI2-D (F) action); disconnect can not opened circuit the locking T12 time; make the detection (DI2-D (F) action) of the place ahead accident effective, can positively carry out disconnect and open circuit.Thereby, can take measures correctly removal accident to all error detection of the place ahead accident and rear accident.

In addition, the same with the 1st execution mode, by using the electric parameters of negative-phase sequence variable quantity, the influence of the electric parameters of the negative-phase sequence amount that is difficult to be subjected to existing all the time (for example the imbalance that produces because of non-full-phase state produce negative-phase sequence amount).

In addition; also can constitute in the swing detection of non-full-phase state in electric power system (in the LOP action) (in the PSB action); in the accident (DI2-D (F) action) that detects protection direction (the place ahead); confirming does not have under the situation of behind direction (rear) accident (DI2-D (R) is failure to actuate), does not wait for from opening circuit of square end being allowed signal 17r and carrying out disconnect and open circuit.

The structure chart of Figure 24 when to be expression with the no negative-phase sequence rear accident in the protection relay system of the present invention's the 10th execution mode confirm that circuit 53 is applicable to the protection relay system of the 9th execution mode shown in Figure 22.

In protection relay system shown in Figure 24, to adding identical symbol, and omit explanation with the described Figure 22 and the identical structure division of relay system of respectively protecting shown in Figure 23.

According to protection relay system shown in Figure 24; in the electric power swing detection of non-full-phase state; under the situation of the directional relay of the negative-phase sequence variable quantity of local terminal (DI2-D (F)) action; can carry out disconnect opens circuit; even if since the timing that accident produces wait under the situation of directional relay (DI2-D (F)) akinesia of the negative-phase sequence variable quantity of this local terminal; as long as confirm unbalance (the OC-UNB action) of electric current; receive the permission signal (17r) that opens circuit from the other side's termination; voltage reduces continuation (UV2 moves mutually) etc.; then can finally carry out disconnect and open circuit, correctly removal accident positively.

And, under the situation of error detection the place ahead accident (DI2-D (F) action) because the trend that the accident of following the rear accident to produce (DI2-D (R) action) is removed is reversed, not only can carry out disconnect to mistake reliably opens circuit the locking T11 time, under the situation of error detection rear accident (DI2-D (R) action) owing to the influence of the place ahead accident generation (DI2-D (F) action), disconnect can not opened circuit the locking T12 time, make the detection (DI2-D (F) action) of the place ahead accident effective, can positively carry out disconnect and open circuit.Thereby, can take measures correctly removal accident to all error detection of the place ahead accident and rear accident.

(the 11st execution mode)

The protection relay system of the 11st execution mode is described with reference to Figure 25.

Figure 25 is the internal logic figure of the protection relay system Ry-A of expression the present invention the 11st execution mode.

In the protection relay system of the 11st execution mode shown in Figure 25; with respect to zero phase-sequence the place ahead relay 41F of the protection relay system in the 2nd execution mode shown in Figure 11, by the AND circuit 54 affirmation circuit (no zero phase-sequence rear accident is confirmed circuit) 57 of being failure to actuate that add zero phase-sequence rear relay 41R in parallel.

No zero phase-sequence rear accident confirms that circuit 57 is replaced as zero phase-sequence rear relay 41R with the negative-phase sequence rear relay 13R of the no negative-phase sequence rear accident affirmation circuit 53 in the protection relay system of the 10th execution mode shown in described Figure 23 and Figure 24.For prolong based on the rear accident of this zero phase-sequence rear relay 41 judge output single triggering timing device 55, postpone to output to after the output based on the delay timer 56 of the prolongation output of this list triggering timing device 55, this delay timer 56 that reverses the NOT circuit 45 with the AND circuit 54 of zero phase-sequence the place ahead relay (DI0-D (F)) 41F, confirm that with the no negative-phase sequence rear accident in described the 10th execution mode structure of circuit 53 is identical, omit detailed action specification.

Therefore; protection relay system according to the 11st execution mode; in system's swing of non-full-phase state, detect the place ahead accident (DI0-D (F) action); confirm under the situation of no rear accident (DI0-D (R) is failure to actuate); not only can carry out disconnect really opens circuit; and; the laggard behaviour of rear accident (DI0-D (R) action) takes place dies and removes; reversing owing to the trend of following this accident to remove and detecting mistakenly under the situation of the place ahead accident (DI0-D (F) action); can carry out disconnect to mistake reliably opens circuit the locking T11 time; and; under the situation of error detection rear accident (DI0-D (R) action) owing to the influence of the place ahead accident generation (DI0-D (F) action); disconnect can not opened circuit the locking T12 time; make the detection (DI0-D (F) action) of the place ahead accident effective, can positively carry out disconnect and open circuit.Thereby, can take measures correctly removal accident to all error detection of the place ahead accident and rear accident.

In addition, the same with the 2nd execution mode, by using the electric parameters of zero phase-sequence variable quantity, the influence of the electric parameters of the zero phase-sequence amount that is difficult to be subjected to existing all the time (for example the imbalance that produces because of non-full-phase state produce zero phase-sequence amount).

In addition; also can constitute in the swing detection of non-full-phase state in electric power system (in the LOP action) (in the PSB action); in the accident (DI0-D (F) action) that detects protection direction (the place ahead); confirming does not have under the situation of behind direction (rear) accident (DI0-D (R) is failure to actuate), does not wait for from opening circuit of square end being allowed signal 17r and carrying out disconnect and open circuit.

(the 12nd execution mode)

The protection relay system of the 12nd execution mode is described with reference to Figure 26.

Figure 26 is the internal logic figure of the protection relay system Ry-A of expression the present invention the 12nd execution mode.

In the protection relay system of the 12nd execution mode shown in Figure 26; the place ahead accident judging part that constitutes with respect to the OR circuit 42F by negative-phase sequence the place ahead relay 13F of the protection relay system in the 3rd execution mode shown in Figure 14 and zero phase-sequence the place ahead relay 41F is confirmed circuit (no rear accident affirmation circuit) 58 by being failure to actuate of rear accident judging part that the AND circuit 54 OR circuit 42R that adds by negative-phase sequence rear relay 13R and zero phase-sequence rear relay 41R in parallel constitutes.

This no rear accident confirms that circuit 58 is with respect to the zero phase-sequence rear relay 41R in the no zero phase-sequence rear accident affirmation circuit 57 of the protection relay system of the 11st execution mode shown in Figure 25, by the OR circuit 42R negative-phase sequence rear relay 13R that adds in parallel.For the rear accident of the rear accident judging part that will constitute by the OR circuit 42R of this negative-phase sequence rear relay 13R and zero phase-sequence rear relay 41 judge single triggering timing device 55 that output prolongs, should list triggering timing device 55 the output of delay timer 56, this delay timer 56 that reverses of prolongation output delay after be input to NOT circuit 45 with the AND circuit 54 of described the place ahead accident arbiter (13F, 41F, 42F), confirm that with the rear accident of respectively not having in described the 10th, the 11st execution mode structure of circuit 53,57 is identical, omit detailed action specification.

Therefore; protection relay system according to the 12nd execution mode; in system's swing of confirming non-full-phase state, detect the place ahead accident (DI2-D (F) action or DI0-D (F) action); under the situation of no rear accident (DI2-D (R) is failure to actuate or DI0-D (R) is failure to actuate); not only can positively carry out disconnect opens circuit; and; the laggard behaviour of rear accident (DI2-D (R) action or DI0-D (R) action) takes place dies and removes; reversing owing to the trend of following this accident to remove and detecting mistakenly under the situation of the place ahead accident (DI2-D (F) action or DI0-D (F) action); can carry out disconnect to mistake reliably opens circuit the locking T11 time; and; under the situation of error detection rear accident (DI2-D (R) action or DI0-D (R) move) owing to the influence of the place ahead accident generation (DI2-D (F) action or DI0-D (F) action); disconnect can not opened circuit the locking T12 time; make the detection (DI2-D (F) action or DI0-D (F) action) of the place ahead accident effectively, can positively carry out disconnect and open circuit.Thereby, can take measures correctly removal accident to all error detection of the place ahead accident and rear accident.

In addition, the same with the 1st execution mode or the 2nd execution mode, by using the electric parameters of negative-phase sequence variable quantity or zero phase-sequence variable quantity, be difficult to the influence of the electric parameters of the negative-phase sequence amount that is subjected to existing all the time or zero phase-sequence amount (for example the imbalance that produces because of non-full-phase state produce negative-phase sequence amount or zero phase-sequence amount).

In addition; also can constitute in the swing detection of non-full-phase state in electric power system (in the LOP action) (in the PSB action); in the accident that detects protection direction (the place ahead) (DI2-D (F) action or DI0-D (F) action); confirming does not have under the situation of behind direction (rear) accident (DI2-D (R) is failure to actuate or DI0-D (R) is failure to actuate), does not wait for from opening circuit of square end being allowed signal 17r and carrying out disconnect and open circuit.

The invention is not restricted to described each execution mode, the implementation phase in, in the scope that does not break away from its spirit, the present invention can carry out various distortion.And, in described each execution mode, comprise the invention in each stage.Therefore, can extract various inventions by the appropriate combination of the disclosed a plurality of constitutive requirements of each execution mode.For example, even if from the whole constitutive requirements shown in each execution mode, delete several constitutive requirements, or make several constitutive requirements combinations, all can solve the technical problem of invention, under the situation that obtains the invention effect, deleted or made up the formation after these constitutive requirements, as invention.

Claims (9)

1, a kind of protection relay system is equipped with:

Detect the swing detection portion of the swing of electric power system;

Detect the phase shortage test section of the phase shortage of electric power system;

Negative-phase sequence the place ahead accident judging part according to the phase relation from the variable quantity of the variable quantity of the voltage of electric power system, negative-phase sequence voltage that electric current is calculated and negative-phase sequence current, is judged the accident of system protection direction;

Department of Communication Force between the relative terminal of system protection, send to receive the disconnect permission signal that opens circuit; With

Circuit part; when detecting the electric power system swing by described swing detection portion; and detect under the state of electric power system phase shortage by described phase shortage test section; have by described negative-phase sequence the place ahead accident judgement section judges under the situation of accident of system protection direction; send the disconnect permission signal that opens circuit by described Department of Communication Force from this terminal side direction the other side terminals side between described relative terminal; in addition; open circuit and allow under the situation of signal receiving disconnect by described Department of Communication Force, to the disconnect output break signal of electric power system from the other side's terminals side between described relative terminal to this terminals side.

2, a kind of protection relay system is equipped with:

Detect the swing detection portion of the swing of electric power system;

Detect the phase shortage test section of the phase shortage of electric power system;

Negative-phase sequence the place ahead accident judging part according to the phase relation from the variable quantity of the variable quantity of the voltage of electric power system, negative-phase sequence voltage that electric current is calculated and negative-phase sequence current, is judged the accident of system protection direction; With

Circuit part; when detecting the electric power system swing by described swing detection portion and detecting under the state of electric power system phase shortage by described phase shortage test section; have by described negative-phase sequence the place ahead accident judgement section judges under the situation of accident of system protection direction, to the disconnect output break signal of electric power system.

3, protection relay system according to claim 2 is characterized in that:

Be equipped with negative-phase sequence rear accident judging part, according to the phase relation from variable quantity with the variable quantity of negative-phase sequence current of the voltage of electric power system, negative-phase sequence voltage that electric current is calculated, judgement has and the rightabout accident of system protection direction;

Timing portion, with the judgement output of having of making of this negative-phase sequence rear accident judging part with the rightabout accident of system protection direction, delay control was exported after 1 time, and, through the 1st time after, continue to export, till the 2nd time; With

The place ahead accident is judged blocking portion; continuing by this timing portion between output described negative-phase sequence rear accident judging part judgement period of output that make and the rightabout accident of system protection direction, stoping the judgement output of the accident that the system protection direction is arranged that described negative-phase sequence the place ahead accident judging part carries out.

4, a kind of protection relay system is equipped with:

Detect the swing detection portion of the swing of electric power system;

Detect the phase shortage test section of the phase shortage of electric power system;

Negative-phase sequence the place ahead accident judging part according to the phase relation from the variable quantity of the variable quantity of the voltage of electric power system, negative-phase sequence voltage that electric current is calculated and negative-phase sequence current, is judged the accident of system protection direction;

Zero phase-sequence the place ahead accident judging part according to the phase relation from the variable quantity of the variable quantity of the voltage of electric power system, zero phase sequence voltage that electric current is calculated and zero-phase-sequence current, is judged the accident of system protection direction;

Department of Communication Force between the relative terminal of system protection, send to receive the disconnect permission signal that opens circuit; With

Circuit part; when detecting the electric power system swing by described swing detection portion; and detect under the state of electric power system phase shortage by described phase shortage test section; at least one side by described negative-phase sequence the place ahead accident judging part and described zero phase-sequence the place ahead accident judging part judges under the situation of the accident that the system protection direction is arranged; send the disconnect permission signal that opens circuit by described Department of Communication Force from this terminal side direction the other side terminals side between described relative terminal; and open circuit and allow under the situation of signal having received disconnect from the other side's terminals side between described relative terminal to this terminals side by described Department of Communication Force, to the disconnect output break signal of electric power system.

5, a kind of protection relay system is equipped with:

Detect the swing detection portion of the swing of electric power system;

Detect the phase shortage test section of the phase shortage of electric power system;

Negative-phase sequence the place ahead accident judging part according to the phase relation from the variable quantity of the variable quantity of the voltage of electric power system, negative-phase sequence voltage that electric current is calculated and negative-phase sequence current, is judged the accident of system protection direction;

Zero phase-sequence the place ahead accident judging part according to the phase relation from the variable quantity of the variable quantity of the voltage of electric power system, zero phase sequence voltage that electric current is calculated and zero-phase-sequence current, is judged the accident of system protection direction; With

Circuit part; when detecting the electric power system swing by described swing detection portion and detecting under the state of electric power system phase shortage by described phase shortage test section; at least one side by described negative-phase sequence the place ahead accident judging part and described zero phase-sequence the place ahead accident judging part judges under the situation of the accident that the system protection direction is arranged, to the disconnect output break signal of electric power system.

6, protection relay system according to claim 5 is characterized in that:

Be equipped with:

Negative-phase sequence rear accident judging part according to the phase relation from the variable quantity of the variable quantity of the voltage of electric power system, negative-phase sequence voltage that electric current is calculated and negative-phase sequence current, is judged and the rightabout accident of system protection direction;

Zero phase-sequence rear accident judging part according to the phase relation from the variable quantity of the variable quantity of the voltage of electric power system, zero phase sequence voltage that electric current is calculated and zero-phase-sequence current, is judged and the rightabout accident of system protection direction;

Timing portion, export after the 1st time of judgement output delay to having of making of described negative-phase sequence rear accident judging part and described zero phase-sequence rear accident judging part and the rightabout accident of system protection direction, and after through the 1st time, continue output, till the 2nd time; With

The place ahead accident is judged blocking portion; between the judgement period of output of having of continuing by this timing portion that output described negative-phase sequence rear accident judging part and described zero phase-sequence rear accident judging part make and the rightabout accident of system protection direction, stop the judgement output of the accident that the system protection direction is arranged that described negative-phase sequence the place ahead accident judging part and described zero phase-sequence the place ahead accident judging part make.

7, a kind of protection relay system is equipped with:

Detect the swing detection portion of the swing of electric power system;

Detect the phase shortage test section of the phase shortage of electric power system;

Negative-phase sequence rear accident judging part according to the phase relation from the variable quantity of the variable quantity of the voltage of electric power system, negative-phase sequence voltage that electric current is calculated and negative-phase sequence current, is judged and the rightabout accident of system protection direction;

Department of Communication Force between the relative terminal of system protection, send to receive the disconnect permission signal that opens circuit; With

Circuit part; when detecting the electric power system swing by described swing detection portion; and detect under the state of electric power system phase shortage by described phase shortage test section; receive disconnect from the other side's terminals side between described relative terminal to this terminals side permission signal that opens circuit by described Department of Communication Force; and by described negative-phase sequence rear accident judgement section judges not with the situation of the rightabout accident of system protection direction under; send the disconnect permission signal that opens circuit by described Department of Communication Force from this terminal side direction the other side terminals side between described relative terminal; simultaneously, export break signal to the disconnect of electric power system.

8, a kind of protection relay system is equipped with:

Detect the swing detection portion of the swing of electric power system;

Detect the phase shortage test section of the phase shortage of electric power system;

Negative-phase sequence rear accident judging part according to the phase relation from the variable quantity of the variable quantity of the voltage of electric power system, negative-phase sequence voltage that electric current is calculated and negative-phase sequence current, is judged and the rightabout accident of system protection direction;

Zero phase-sequence rear accident judging part according to the phase relation from the variable quantity of the variable quantity of the voltage of electric power system, zero phase sequence voltage that electric current is calculated and zero-phase-sequence current, is judged and the rightabout accident of system protection direction;

Department of Communication Force between the relative terminal of system protection, send to receive the disconnect permission signal that opens circuit; With

Circuit part; when detecting the electric power system swing by described swing detection portion; and detect under the state of electric power system phase shortage by described phase shortage test section; receive disconnect from the other side's terminals side between described relative terminal to this terminals side permission signal that opens circuit by described Department of Communication Force; and judge not under the situation with the rightabout accident of system protection direction by described negative-phase sequence rear accident judging part and described zero phase-sequence rear accident judging part both sides; send the disconnect permission signal that opens circuit by described Department of Communication Force from this terminal side direction the other side terminals side between described relative terminal; simultaneously, export break signal to the disconnect of electric power system.

9, a kind of protection relay system is equipped with:

Detect the swing detection portion of the swing of electric power system;

Detect the phase shortage test section of the phase shortage of electric power system;

Negative-phase sequence the place ahead accident judging part according to the phase relation from the variable quantity of the variable quantity of the voltage of electric power system, negative-phase sequence voltage that electric current is calculated and negative-phase sequence current, is judged the accident of system protection direction;

The current unbalance test section from the electric current of each phase of electric power system, detects each alternate current value unbalance more than adjusted value;

Negative-phase sequence rear accident judging part according to the phase relation from the variable quantity of the variable quantity of the voltage of electric power system, negative-phase sequence voltage that electric current is calculated and negative-phase sequence current, is judged and the rightabout accident of system protection direction;

Department of Communication Force between the relative terminal of system protection, send to receive the disconnect permission signal that opens circuit;

Not enough voltage detection department, the voltage that detects electric power system is being below the adjusted value more than the certain hour; With

Circuit part; when detecting the electric power system swing by described swing detection portion; and detect under the state of electric power system phase shortage by described phase shortage test section; have by described negative-phase sequence the place ahead accident judgement section judges under the situation of accident of system protection direction; or detect each three-phase current value under the unbalance situation more than the adjusted value by described current unbalance test section; or at the permission signal that opens circuit by the disconnect of described Department of Communication Force reception from the other side's terminals side between described relative terminal to this terminals side; and by described negative-phase sequence rear accident judgement section judges not with the situation of the rightabout accident of system protection direction under; or the voltage that detects electric power system by described not enough voltage detection department more than the certain hour under the situation below the adjusted value; send the disconnect permission signal that opens circuit by described Department of Communication Force from this terminal side direction the other side terminals side between described relative terminal; and; open circuit when allowing signal when having received disconnect, to the disconnect output break signal of electric power system from the other side's terminals side to this terminals side.

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