CA2024488A1 - Method and apparatus for line power monitoring for uninterruptible power supplies - Google Patents

Method and apparatus for line power monitoring for uninterruptible power supplies

Info

Publication number
CA2024488A1
CA2024488A1 CA2024488A CA2024488A CA2024488A1 CA 2024488 A1 CA2024488 A1 CA 2024488A1 CA 2024488 A CA2024488 A CA 2024488A CA 2024488 A CA2024488 A CA 2024488A CA 2024488 A1 CA2024488 A1 CA 2024488A1
Authority
CA
Canada
Prior art keywords
reference waveform
power
waveform
rms value
line
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA2024488A
Other languages
French (fr)
Other versions
CA2024488C (en
Inventor
Richard V. Baxter, Jr.
Frederick A. Stich
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Prolec GE Waukesha Inc
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of CA2024488A1 publication Critical patent/CA2024488A1/en
Application granted granted Critical
Publication of CA2024488C publication Critical patent/CA2024488C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/24—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/50—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to the appearance of abnormal wave forms, e.g. ac in dc installations

Abstract

AC line monitoring is provided for uninterruptible power supplies to detect AC power system line faults by comparing the presently received cycle of the AC power line signal with a reference waveform. The reference waveform is formed of a composite of waveforms from prior cycles which adapts over time to the shape of the AC power line waveform, so that waveforms other than pure sinusoids can be accepted without triggering false fault conditions. The composite reference waveform may be formed of essentially all samples from prior cycles with exponentially decaying weighting. An excessive deviation of the current waveform from the reference waveform results in a fault being detected which causes switching of the uninterrupible power supply to provide backup power. The RMS value of the power line voltage is also estimated on a substantially real time basis, preferably by calculating the RMS value of the reference waveform, to provide a fault condition signal when the estimated RMS
value falls below a selected level, which also can be utilized to cause switching of the uninterruptible power supply.
CA 2024488 1989-09-08 1990-08-31 Method and apparatus for line power monitoring for uninterruptible power supplies Expired - Fee Related CA2024488C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/404,902 1989-09-08
US07/404,902 US5229651A (en) 1989-09-08 1989-09-08 Method and apparatus for line power monitoring for uninterruptible power supplies

Publications (2)

Publication Number Publication Date
CA2024488A1 true CA2024488A1 (en) 1991-03-09
CA2024488C CA2024488C (en) 1995-05-02

Family

ID=23601510

Family Applications (1)

Application Number Title Priority Date Filing Date
CA 2024488 Expired - Fee Related CA2024488C (en) 1989-09-08 1990-08-31 Method and apparatus for line power monitoring for uninterruptible power supplies

Country Status (6)

Country Link
US (1) US5229651A (en)
EP (1) EP0416569B1 (en)
JP (1) JP3190666B2 (en)
AT (1) ATE130474T1 (en)
CA (1) CA2024488C (en)
DE (1) DE69023579T2 (en)

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Also Published As

Publication number Publication date
DE69023579D1 (en) 1995-12-21
JP3190666B2 (en) 2001-07-23
EP0416569A2 (en) 1991-03-13
CA2024488C (en) 1995-05-02
JPH03150026A (en) 1991-06-26
ATE130474T1 (en) 1995-12-15
EP0416569B1 (en) 1995-11-15
DE69023579T2 (en) 1996-04-11
US5229651A (en) 1993-07-20
EP0416569A3 (en) 1992-03-18

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