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KR940020648A - Digital relay method for load ground protection of electronic switchgear - Google Patents

Digital relay method for load ground protection of electronic switchgear Download PDF

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Publication number
KR940020648A
KR940020648A KR1019930002071A KR930002071A KR940020648A KR 940020648 A KR940020648 A KR 940020648A KR 1019930002071 A KR1019930002071 A KR 1019930002071A KR 930002071 A KR930002071 A KR 930002071A KR 940020648 A KR940020648 A KR 940020648A
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South Korea
Prior art keywords
image
load
ground fault
phase difference
current
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KR1019930002071A
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Korean (ko)
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KR950009124B1 (en
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허노재
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김정국
현대중공업 주식회사
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters

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  • Emergency Protection Circuit Devices (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)

Abstract

본 발명은 영상전압 및 영상전류의 위상차와 영상전류의 값을 이용하여 부하가 지락으로부터 손상되지 않도록 보호하는 것으로서 종래에는 부하를 지락사고로부터 보호하기 위하여 전력계통의 접지방식에 따라서 특성에 알맞는 계전기를 선택 사용하였으므로 설치운용상에 많은 어려움이 있었음은 물론 계전기를 잘못 선택하였을 경우에는 디지탈 배전반의 계전성능이 저하되어 지락사고의 발생시 계전기능을 발휘하지 못하였다.The present invention is to protect the load from damage from a ground fault by using the phase difference of the image voltage and the image current and the value of the image current. Conventionally, the relay suitable for the characteristics according to the grounding method of the power system to protect the load from the ground fault Since the selection was used, there were many difficulties in the installation operation, and if the relay was selected incorrectly, the relay performance of the digital switchboard was degraded and the relay function was not performed in the event of a ground fault.

본 발명은 부하에 공급되는 전원의 영상전값과, 영상전류 및 영상전압의 위상차를 이용하는 것으로서 부하의 종류, 용량 및 특성등에 따라서 지락사고의 발생시 영상 과전류비와, 설정값 이상의 영상전류 및 영상전압의 위상차에 따른 전원의 차단 지연시간을 부하에 손상을 주지 않는 범위 내에서 실험을 통하여 미리 설정 및 룩업 테이블에 저장하여 두고, 부하로 공급되는 전원의 영상전류 및 영상전압을 일정주기로 샘플링하여 저장하고, 샘플링한 영상전류와 영상전압의 위상차를 산출 및 기준 위상차와 비교함과 아울러 영상전류의 값과 기준 영상전류의 값으로 영상 과전류비를 산출 및 설정값과 비교하여 지락사고의 발생을 판별하고, 지락사고 발생이 판별될 경우에는 차단 지연시간을 룩업 테이블에서 리드한후 리드한 차단 지연시간동안 지락사고가 지속될 경우에 차단하여 부하에 공급되지 않도록 함으로써 지락사고가 발생하면, 설정된 차단 지연시간 후에 전원을 차단하여 지락사고로 인한 부하의 손상을 방지할 수 있고, 부하의 종류, 용량 및 특성에 따라 간단히 동작변수만을 변경시키면 되어 설치운용이 간편함은 물론 작업 소요시간이 단축되며, 부하에 손상을 주지 않는 범위 내에서 순간적인 지락사고가 발생될 경우에는 부하로 계속 전원을 공급하여 부하를 정지됨이 없이 계속 동작시킬 수 있다.The present invention utilizes the phase change value of the power supplied to the load, the phase difference between the image current and the image voltage, and according to the type, capacity and characteristics of the load, the image overcurrent ratio at the occurrence of a ground fault, The power off delay time according to the phase difference is stored in the preset and lookup table through experiments within the range that does not damage the load, and the video current and the video voltage of the power supplied to the load are sampled and stored at regular intervals. The phase difference between the sampled image current and the image voltage is calculated and compared with the reference phase difference, and the image overcurrent ratio is calculated and compared with the set value using the value of the image current and the reference image current to determine the occurrence of a ground fault. If an incident occurs, the blocking delay time is read from the lookup table, and then the blocking delay time is If a ground fault occurs by shutting off if the accident persists and not supplying it to the load, it can cut off the power after a set shutdown delay time to prevent damage to the load due to the ground fault, and according to the type, capacity and characteristics of the load It is easy to install and shorten the operation time by simply changing the operation variables. If a momentary ground fault occurs within the range that does not damage the load, the power is continuously supplied to the load without stopping the load. You can keep it running.

Description

전자식 배전반의 부하 지락보호를 위한 디지탈 계전방법Digital relay method for load ground protection of electronic switchgear

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제1도는 본 발명의 디지탈 계전방법이 적용되는 전자식 배전반의 구성을 보인 회로도.1 is a circuit diagram showing the configuration of an electronic switchgear to which the digital relay method of the present invention is applied.

제2도는 본 발명의 디지탈 계전방법을 보인 도면으로서, (가)는 메인루틴을 보인 신호흐름도, (나)는 인터럽트 루틴을 보인 신호흐름도.2 is a diagram showing a digital relay method of the present invention, (a) is a signal flow diagram showing the main routine, (b) a signal flow diagram showing the interrupt routine.

Claims (3)

부하로 공급되는 각 상의 전류 및 각 상간의 전압을 샘플링하여 영상전류 및 영상전압을 산출하는 영상전류/전압 산출과정과, 상기 영상전류/전압 산출과정에서 산출한 영상전류 및 영상전압의 위상차를 산출하는 위상차 산출과정과, 상기 영상전류/전압 산출과정에서 산출한 영상전류를 기준 영상전류와 비교하여 영상 과전류비를 산출하는 영상 과전류비 산출과정과, 상기 위상차 산출과정에서 산출한 위상차 및 영상 과전류비 산출과정에서 산출한 영상 과전류비를 설정한 기준 위상차 및 기준 영상 과전류비와 각기 비교하여 지락사고의 발생을 판단하는 판단단계와, 상기 판단단계에서 지락사고의 발생을 판단할 경우에 부하의 전원을 차단시키는 전원 제어 단계로됨을 특징으로 하는 전자식 배전반의 부하 지락보호를 위한 디지탈 계전방법.An image current / voltage calculation process for calculating an image current and an image voltage by sampling current and voltages between each phase supplied to a load, and calculating a phase difference between the image current and image voltage calculated in the image current / voltage calculation process. A phase difference calculation step of calculating a phase difference and an image over current ratio by comparing the image current calculated in the image current / voltage calculation step with a reference image current, and the phase difference and image over current ratios calculated in the phase difference calculation step. A judgment step of judging the occurrence of a ground fault by comparing the image overcurrent ratio calculated in the calculation process with the reference phase difference and the reference image overcurrent ratio, respectively, and in the case of determining the occurrence of a ground fault, Digital relay method for protecting the load ground of the electronic switchgear characterized in that the power control step of blocking. 제1항에 있어서, 판단단계는 산출한 위상차 및 영상 과전류비가 모두 설정한 기준 위상차 및 기준 영상 과전류비 이상으로 될 경우에 지락사고의 발생으로 판단하는 것을 특징으로 하는 전자식 배전반의 부하 지락보호를 위한 디지탈 계전방법.The method of claim 1, wherein the determining step comprises determining that a ground fault occurs when the calculated phase difference and the image overcurrent ratio are equal to or greater than the set reference phase difference and the reference image overcurrent ratio. Digital relay method. 제1항에 있어서, 전원 제어단계는, 지락사고의 발생일 경우에 지락사고 발생 누적시간을 증가시키고 지락사고의 발생이 아닐 경우에 지락사고 발생 누적시간을 감소시키면서 지락사고 발생 누적시간이 설정된 차단 지연시간 이상으로 될 경우에 전원을 차단시키는 것을 특징으로 하는 전자식 배전반의 부하 지락보호를 위한 디지탈 계전방법.The method of claim 1, wherein the power control step includes: setting a cumulative time of ground fault occurrences while increasing the accumulated time of ground fault occurrences in case of a ground fault; A digital relay method for protecting the load ground of the electronic switchgear, wherein the power supply is cut off when the delay time is exceeded. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019930002071A 1993-02-15 1993-02-15 Digital relaying method of electronic switch-board for protecting load-grounding Expired - Fee Related KR950009124B1 (en)

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Application Number Priority Date Filing Date Title
KR1019930002071A KR950009124B1 (en) 1993-02-15 1993-02-15 Digital relaying method of electronic switch-board for protecting load-grounding

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Application Number Priority Date Filing Date Title
KR1019930002071A KR950009124B1 (en) 1993-02-15 1993-02-15 Digital relaying method of electronic switch-board for protecting load-grounding

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KR940020648A true KR940020648A (en) 1994-09-16
KR950009124B1 KR950009124B1 (en) 1995-08-14

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100334428B1 (en) * 1999-01-22 2002-05-02 권영한 A Controller for Fault Indicator of Power Lines
KR100342096B1 (en) * 1997-07-10 2002-06-26 린다 유 퓨스 Solid state overload relay
KR100383724B1 (en) * 2000-12-22 2003-05-14 이창영 An automatical power supply switching apparatus
US6989977B2 (en) 2002-01-28 2006-01-24 Kabushiki Kaisha Toshiba Digital directional relay

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100342096B1 (en) * 1997-07-10 2002-06-26 린다 유 퓨스 Solid state overload relay
KR100334428B1 (en) * 1999-01-22 2002-05-02 권영한 A Controller for Fault Indicator of Power Lines
KR100383724B1 (en) * 2000-12-22 2003-05-14 이창영 An automatical power supply switching apparatus
US6989977B2 (en) 2002-01-28 2006-01-24 Kabushiki Kaisha Toshiba Digital directional relay

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Publication number Publication date
KR950009124B1 (en) 1995-08-14

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