CN103269061A - Anti-aging protective device of lightning arrester and with impedance alterable - Google Patents
Anti-aging protective device of lightning arrester and with impedance alterable Download PDFInfo
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- CN103269061A CN103269061A CN2013102061518A CN201310206151A CN103269061A CN 103269061 A CN103269061 A CN 103269061A CN 2013102061518 A CN2013102061518 A CN 2013102061518A CN 201310206151 A CN201310206151 A CN 201310206151A CN 103269061 A CN103269061 A CN 103269061A
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- lightning arrester
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Abstract
The invention relates to the field of lightning arresters, in particular to an anti-aging protective device of a lightning arrester and with impedance alterable. The anti-aging protective device of the lightning arrester and with the impedance alterable comprises an insulation adapter, an impedance increasing impedor, an impedance changing switch and an impedance changing controller, wherein the lighting arrester to be protected is connected to the insulation adapter and then is connected to a cable through a binding post, a conducting bar and a conducting post and finally is connected to an upper connecting bar through a conducting rod, the impedance increasing impedor and the impedance changing switch are connected between the upper connecting bar and a lower connecting bar in parallel, and the lower connecting bar is connected to the ground through the impedance changing controller. According to the anti-aging protective device of the lightning arrester and with the impedance alterable, the lighting arrester aging online detection technique which is quite mature at present is adopted, the chargeability of the lighting arrester to be protected is reduced with the impedance automatic-changing method, the aging process of an aged lighting arrester can be delayed, time for maintaining is gained for sites, especially unattended sites or complicated sites, and the probability of explosion of lighting arresters is reduced.
Description
Technical field
The present invention relates to the lightning arrester anti-aging protective device in lightning arrester field, particularly a kind of variableimpedance.
Background technology
Lightning arrester is to be directed to ground for giving tacit consent to electric current (particularly, conducting lightning currents), and the overvoltage of induction is restricted to level with the capacity of the equipment that is connected to the protective device downstream or material coupling.For this reason, lightning arrester is connected between the phase and ground to protected power devices usually.
Known lightning arrester has at least a rheostat to be embodied as the overvoltage protection member, namely its resistance (or impedance) value according to being applied to the voltage of its electrode the electric member of marked change.Specifically, the voltage of rheostat at its electrode place has very high resistance (or impedance) when not reaching threshold value, surpasses this threshold value, and impedance significantly descends.Therefore, in normal running, namely under the normal voltage level, rheostatic impedance is enough high, thus be directed to ground pass electric current (being called leakage current) can ignore (for example, have milliampere level an intensity).Rheostat preferably uses metal oxide varistor (MOV).
Yet current-carrying rheostatic aging (lightning strike also can accelerate this and wear out) can cause its impedance to reduce gradually, thereby leakage current intensity is increased.The increase of this leakage current causes rheostat significantly heating owing to Joule effect, and this self-heating helps to reduce impedance, therefore increases the intensity of leakage current.This phenomenon (being called heat dissipation) causes the rheostat surface temperature significantly to increase, and these may be for example greater than 150 ℃.Equipment and material around the heat energy that rheostat discharges when its end-of-life enough is delivered to, this can cause serious fire and or risk of short-circuits.
In case lightning arrester is in operation aging, then bring potential safety hazard to system, need in time to handle to change, avoid the generation of explosion accident, but the restriction of some actual conditions is for example not in place to the aging detection of lightning arrester, unattended operation scene etc., the processing to aging lightning arrester is incured loss through delay in the capital, makes hidden danger in time not get rid of, and all there is similar problem in a lot of systems.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of lightning arrester anti-aging protective device of variableimpedance; be used for being connected on protected lightning arrester circuit; be mainly used in the ageing state of the protected lightning arrester of real time monitoring; when protected lightning arrester has just entered ageing state; can increase impedance automatically; thereby reduce the chargeability of protected lightning arrester, play the effect of the ager process that delays protected lightning arrester, gain time to maintenance.
Technical scheme of the present invention is: the lightning arrester anti-aging protective device of variableimpedance; this device comprises an insulation adapter; one increases the resistance impedance; one becomes the resistance switch, and a rheostatic controller, shielded lightning arrester insert described insulation adapter; be connected to cable by binding post, busbar, conductive pole; arrange to last connection by conducting rod again, described go up to connect row and connect between the row parallel connection down be equipped with and describedly increase the resistance impedance and become the resistance switch, describedly connect row down by described rheostatic controller ground connection.
Described insulation adapter is the Connection Block that protected lightning arrester inserts usefulness, plays sealed insulation.
To be insulation level bear the adapt contactor of electric pressure of maximum pressure drop with increasing the resistance impedance with described change resistance switch, and increases resistance impedance uses in parallel, is used for controlling described increasing and hinders impedance and be connected with described protected lightning arrester or disconnect.
It is described that to increase the resistance impedance be about 20% the arrester valve piece made unit that is equivalent to protected lightning arrester standard residual voltage.
Described rheostatic controller be a kind of be monitor portion with the lightning arrester on-line measuring device; add the control device of threshold decision and marshalling switch drive part; the situation of change of the meritorious leakage current of this device energy real-time analysis lightning arrester; judging whether aging or deterioration of described protected lightning arrester, and control described change resistance switch motion according to predefined aging protection threshold value.
By said structure, the invention has the advantages that:
The present invention combines the aging online measuring technique of lightning arrester of current comparative maturity; utilize the method that becomes resistance automatically to reduce the chargeability of protected lightning arrester; the ager process of the lightning arrester that delays to have worn out; win the repair time for on-the-spot especially unattended operation or comparatively complicated scene, reduced the probability of Explosion of on Arrester.
Description of drawings
The invention will be further described in conjunction with the embodiments with reference to the accompanying drawings.
Fig. 1 is structural representation of the present invention,
Fig. 2 is vertical view of the present invention,
Fig. 3 is that the A of Fig. 1 is to view.
Among the figure: 1 binding post; 2 busbars; 3 insulation adapters; 4 conductive poles; 5 cables; 6 conducting rods; 7. go up and connect row; 8 increase the resistance impedance; 9 become the resistance switch; 10 shells; Connect row 11 times; 12 rheostatic controllers; 13 earth terminals.
Embodiment
Referring to Fig. 1, this protective device is the earth terminal that is serially connected in protected lightning arrester, and namely protected lightning arrester is by the present invention, again through earth terminal 13 ground connection.This device comprises shell 10, and insulation adapter 3 increases resistance impedance 8, becomes resistance switch 9, rheostatic controller 12, and insulation adapter 3 is Connection Blocks that protected lightning arrester inserts usefulness, plays sealed insulation; Increase the part that resistance impedance 8 employing standards are suitable for lightning arrester, be equivalent to about 20% arrester valve piece made unit of protected lightning arrester standard residual voltage.Become resistance switch 9 and adopt insulation levels to bear the adapt contactor of electric pressure of maximum pressure drop with increasing resistance impedance 8, and increase resistance impedance 8 use in parallel, be used for controlling increasing and hinder impedance 8 and be connected with protected lightning arrester or disconnect.
If protected lightning arrester is because of maintenance or replacing, leakage current is lower than aging protection threshold value, and rheostatic controller 12 is namely controlled change resistance switch 9 and moved, and makes to increase resistance impedance 8 and protected lightning arrester disconnection, realizes automatic drag reduction.
The concrete connected mode of this device is: protected lightning arrester inserts insulation adapter 3; be connected to cable 5 by binding post 1, busbar 2, conductive pole 4; arrange 7 by conducting rod 6 to last connection again; parallel connection is equipped with to increase and is hindered impedance 8 and change resistance switch 9 between last connection row 7 and the following row of connection 11, and following connection row 11 passes through rheostatic controller 12 and is connected with earth terminal 13.
The present invention combines the aging online measuring technique of lightning arrester of current comparative maturity, utilize the method that becomes resistance automatically to reduce the chargeability of protected lightning arrester, the ager process of the lightning arrester that delays to have worn out, be example with the 110kV lightning arrester: among the GB11032 in the table 6 rated voltage be the power station type lightning arrester of 108kV, 10kA nominal thunder and lightning residual voltage is 281kV, direct current 1mA reference voltage is 157kV, residual voltage ratio=281/157=1.79, be 450kV according to another requiring 110kV system equipment minimum rated lightning impulse tolerance level in the GB311.1 table 3, its insulation coordination COEFFICIENT K c=450/281 ≈ 1.6; The regulation that cooperates factor Kc according to 4.7.3, Kc 〉=1.4 are generally got by China, then have 0.2 super nargin space with respect to 1.6, that is to say, the residual voltage of lightning arrester improves 20% more also or within common safe range, increases the resistance impedance and utilized this space exactly.Certainly, the lightning arrester of different model, use from different places, some difference of this space, but this is super nargin space after all, after lightning arrester was aging, its residual voltage also can slightly descend.From chargeability expression formula Kh=U
Operation/ U
1mACan find out, increase by 20% valve block, be exactly the U with lightning arrester
1mABring up to 120%U
1mABe equivalent to chargeability and reduced by 16.7%; leakage current will inevitably be reduced within the safe range; the leakage current of the lightning arrester that is protected will be broken through aging threshold value again; also need to continue for some time; the aging speed of lightning arrester before the reference; can roughly judge the lightning arrester senile cause, different senile causes has determined the length of time expand, but common time expand is at the order of magnitude of the moon; if sealing problem appears in lightning arrester; then the time of Yan Changing then shorter, generally be the week or day the order of magnitude, at this moment; should promote alert levels, in time take measures.
Although illustrated and described embodiments of the invention, for the ordinary skill in the art, be appreciated that without departing from the principles and spirit of the present invention and can carry out multiple variation, modification, replacement and modification to these embodiment, scope of the present invention is limited by claims and equivalent thereof.
Claims (4)
1. the lightning arrester anti-aging protective device of variableimpedance is characterized in that:
This device comprises an insulation adapter; one increases the resistance impedance; one becomes the resistance switch; one rheostatic controller; shielded lightning arrester inserts described insulation adapter, is connected to cable by binding post, busbar, conductive pole, arranges to last connection by conducting rod again; described go up to connect row and connect between the row parallel connection down be equipped with and describedly increase the resistance impedance and become the resistance switch, describedly connect row down by described rheostatic controller ground connection.
2. according to the lightning arrester anti-aging protective device of the described variableimpedance of claim 1, it is characterized in that: described rheostatic controller be a kind of be monitor portion with the lightning arrester on-line measuring device, add the control device of threshold decision and marshalling switch drive part.
3. according to the lightning arrester anti-aging protective device of the described variableimpedance of claim 1, it is characterized in that: described change resistance switch is insulation level and increase the resistance impedance and bear the adapt contactor of electric pressure of maximum pressure drop.
4. according to the lightning arrester anti-aging protective device of the described variableimpedance of claim 1, it is characterized in that: described to increase the resistance impedance be about 20% the arrester valve piece made unit that is equivalent to protected lightning arrester standard residual voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310206151.8A CN103269061B (en) | 2013-05-29 | 2013-05-29 | The arrester anti-aging protection device of variable impedance |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310206151.8A CN103269061B (en) | 2013-05-29 | 2013-05-29 | The arrester anti-aging protection device of variable impedance |
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| CN103269061A true CN103269061A (en) | 2013-08-28 |
| CN103269061B CN103269061B (en) | 2018-03-02 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0462694A2 (en) * | 1990-06-21 | 1991-12-27 | Electric Power Research Institute, Inc | Protective device for temporary system overvoltages |
| US6459559B1 (en) * | 1999-01-14 | 2002-10-01 | Dale Jack Christofersen | Thyristor controlled dynamic voltage suppressor for electric power systems |
| JP2003070156A (en) * | 2001-08-27 | 2003-03-07 | Nittan Co Ltd | Lighting rod system and unit |
| CN102484419A (en) * | 2009-08-31 | 2012-05-30 | Abb技术有限公司 | A method and a device for overvoltage protection, and an electric system with such a device |
| CN102664384A (en) * | 2012-05-02 | 2012-09-12 | 胡勇坚 | Intelligent tripping method for power supply lightning arrester |
| CN203301139U (en) * | 2013-05-29 | 2013-11-20 | 安徽通辰电气有限公司 | Variable-impedance arrester anti-aging protection device |
-
2013
- 2013-05-29 CN CN201310206151.8A patent/CN103269061B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0462694A2 (en) * | 1990-06-21 | 1991-12-27 | Electric Power Research Institute, Inc | Protective device for temporary system overvoltages |
| US6459559B1 (en) * | 1999-01-14 | 2002-10-01 | Dale Jack Christofersen | Thyristor controlled dynamic voltage suppressor for electric power systems |
| JP2003070156A (en) * | 2001-08-27 | 2003-03-07 | Nittan Co Ltd | Lighting rod system and unit |
| CN102484419A (en) * | 2009-08-31 | 2012-05-30 | Abb技术有限公司 | A method and a device for overvoltage protection, and an electric system with such a device |
| CN102664384A (en) * | 2012-05-02 | 2012-09-12 | 胡勇坚 | Intelligent tripping method for power supply lightning arrester |
| CN203301139U (en) * | 2013-05-29 | 2013-11-20 | 安徽通辰电气有限公司 | Variable-impedance arrester anti-aging protection device |
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| CN103269061B (en) | 2018-03-02 |
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