KR970071890A - 지락 과전압 계전기의 고장판단 방법 - Google Patents

지락 과전압 계전기의 고장판단 방법 Download PDF

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Publication number
KR970071890A
KR970071890A KR1019960011567A KR19960011567A KR970071890A KR 970071890 A KR970071890 A KR 970071890A KR 1019960011567 A KR1019960011567 A KR 1019960011567A KR 19960011567 A KR19960011567 A KR 19960011567A KR 970071890 A KR970071890 A KR 970071890A
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KR
South Korea
Prior art keywords
number component
overvoltage relay
ground fault
calculating
imaginary number
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Application number
KR1019960011567A
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English (en)
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KR0179877B1 (ko
Inventor
김영돈
Original Assignee
이종수
Lg 산전 주식회사
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Priority to KR1019960011567A priority Critical patent/KR0179877B1/ko
Publication of KR970071890A publication Critical patent/KR970071890A/ko
Application granted granted Critical
Publication of KR0179877B1 publication Critical patent/KR0179877B1/ko

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    • 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
    • H02H3/26—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 difference between voltages or between currents; responsive to phase angle between voltages or between currents
    • H02H3/32—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 difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
    • H02H3/34—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 difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors of a three-phase system

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  • Emergency Protection Circuit Devices (AREA)

Abstract

본 발명은 전력 수용가의 배전반에서 안정적 전력공급을 위해 사용하는 지력 과전압 계전기에 있어서, 영상 변압기를 통해 입력되는 기본 주파수 성분의 신호에 고조파성분이 포함됨으로 인해 이 기본 주파수 성분이 왜곡되고 이로인하여 발생하는 오동작을 방지하기 위한 방법을 제공하는 것으로, 입력 영상전압을 복소수로 표현하고 이를 재귀적 DFT(Recursive Fourier Discrete Transform)를 이용하여 전압의 크기를 구하고 이를 처리하여 직교함수의 특성으로 인한 고조파 성분의 왜곡으로 인한 지락 과전압 계전기의 오동작을 방지할 수 있게 한 것이다.

Description

지락 과전압 계전기의 고장판단 방법
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음
제2도는 정지형 지락 과전압 계전기의 내부 구성도, 제3도는 제2도에서 이상 발생기 각 부의 출력파형도, 제4도는 디지탈형 지락 과전압 계전기의 구성도, 제5도는 입력 영상전압의 파형도.

Claims (1)

  1. 입력 아날로그 영상전압을 디지탈 영상전압으로 변환한 값에 대하여 임의의 샘플링 시점에서 디지탈 값을 수집하는 제1단계와, 상기 제1단계에서 수집한 입력 영상전압의 디지탈 값으로부터 재귀적 DFT(recursive Fourier Discrete Transform)로 실수성분과 허수성분을 구하고 이 실수, 허수성분으로부터 그 크기를 계산하는 제2단계와, 제2단계에서 구한 크기와 설정된 영상전압 정정치를 비교하여 고장으로 판단되면 소정시간을 지연시키는 제3단계와, 상기 제3단계에서 지연되는 시간이 기 설정된 동작시간 정정치보다 크면 고장으로 판단하여 계전기 동작명령을 하달하는 제4단계로 이루어짐을 특징으로 하는 지락 과전압 계전기의 고장판단 방법.
    ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.
KR1019960011567A 1996-04-17 1996-04-17 회로 차단기의 과전류 차단 제어 장치 및 방법 KR0179877B1 (ko)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019960011567A KR0179877B1 (ko) 1996-04-17 1996-04-17 회로 차단기의 과전류 차단 제어 장치 및 방법

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019960011567A KR0179877B1 (ko) 1996-04-17 1996-04-17 회로 차단기의 과전류 차단 제어 장치 및 방법

Publications (2)

Publication Number Publication Date
KR970071890A true KR970071890A (ko) 1997-11-07
KR0179877B1 KR0179877B1 (ko) 1999-05-15

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Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019960011567A KR0179877B1 (ko) 1996-04-17 1996-04-17 회로 차단기의 과전류 차단 제어 장치 및 방법

Country Status (1)

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KR (1) KR0179877B1 (ko)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101281307B1 (ko) * 2005-10-10 2013-07-03 제너럴 일렉트릭 캄파니 머신 상태 모니터링 방법, 모니터링 시스템 및 주파수 정류시스템

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101281307B1 (ko) * 2005-10-10 2013-07-03 제너럴 일렉트릭 캄파니 머신 상태 모니터링 방법, 모니터링 시스템 및 주파수 정류시스템

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Publication number Publication date
KR0179877B1 (ko) 1999-05-15

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