Simulation and analysis of a gas insulated switchgear explosion accident caused by a failure of high-voltage circuit breaker in a thermal power plant
This study analyses a gas insulated switchgear explosion accident caused by a failure of the circuit breaker (CB) in a thermal power plant, which resulted in the explosion of the CB and the burning of the potential transformer (PT). Through X-ray detection and disassemble examination of the damaged...
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doaj-6e996655c37743e2831b15c89db6e79d2021-04-02T12:46:02ZengWileyThe Journal of Engineering2051-33052019-03-0110.1049/joe.2018.5468JOE.2018.5468Simulation and analysis of a gas insulated switchgear explosion accident caused by a failure of high-voltage circuit breaker in a thermal power plantXun Zhang0Kai Dai1Wei Niu2Rongbin XieHuarong Zeng3Yi Wen4Xiaohong Ma5Electric Power Research Institute of Guizhou Power Grid Co. LtdChongqing UniversityElectric Power Research Institute of Guizhou Power Grid Co. LtdElectric Power Research Institute of Guizhou Power Grid Co. LtdElectric Power Research Institute of Guizhou Power Grid Co. LtdElectric Power Research Institute of Guizhou Power Grid Co. LtdThis study analyses a gas insulated switchgear explosion accident caused by a failure of the circuit breaker (CB) in a thermal power plant, which resulted in the explosion of the CB and the burning of the potential transformer (PT). Through X-ray detection and disassemble examination of the damaged CB, it is found that the A-phase moveable contact was not opened completely. After analysing the voltage waveform obtained from the phasor measurement unit recorder system, it is speculated that this failure is caused by the process of repeated arc strike. For verification and further analysis, the fault process is simulated in the EMTP; the arc is properly modelled by an extended KEMA's equation-based model which is proposed in this study. The simulation results match well with the actual situation; the contact gap would be repeated breakdown because its breakdown voltage is reduced, and the very fast transient overvoltage (VFTO) would be generated in these repeated strike processes. Due to the steep front and high amplitude of VFTO, the insulation of the PT would be damaged and led to the occurrence of PT short-circuit fault. The current would increase rapidly and causes the CB to explode subsequently.https://digital-library.theiet.org/content/journals/10.1049/joe.2018.5468circuit breakerspotential transformersovervoltagepower system measurementovervoltage protectionarcs (electric)EMTPgas insulated switchgearfault diagnosisthermal power stationsthermal power plantdamaged CBA-phase moveable contactvoltage waveformphasor measurement unit recorder systemrepeated arc strikesimulation resultsbreakdown voltagerepeated strike processesPT short-circuit faultgas insulated switchgear explosion accidenthigh-voltage circuit breaker failurepotential transformerX-ray detectiondisassemble examinationEMTPextended KEMA equation-based modelvery fast transient overvoltagecontact gapVFTO |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Xun Zhang Kai Dai Wei Niu Rongbin Xie Huarong Zeng Yi Wen Xiaohong Ma |
spellingShingle |
Xun Zhang Kai Dai Wei Niu Rongbin Xie Huarong Zeng Yi Wen Xiaohong Ma Simulation and analysis of a gas insulated switchgear explosion accident caused by a failure of high-voltage circuit breaker in a thermal power plant The Journal of Engineering circuit breakers potential transformers overvoltage power system measurement overvoltage protection arcs (electric) EMTP gas insulated switchgear fault diagnosis thermal power stations thermal power plant damaged CB A-phase moveable contact voltage waveform phasor measurement unit recorder system repeated arc strike simulation results breakdown voltage repeated strike processes PT short-circuit fault gas insulated switchgear explosion accident high-voltage circuit breaker failure potential transformer X-ray detection disassemble examination EMTP extended KEMA equation-based model very fast transient overvoltage contact gap VFTO |
author_facet |
Xun Zhang Kai Dai Wei Niu Rongbin Xie Huarong Zeng Yi Wen Xiaohong Ma |
author_sort |
Xun Zhang |
title |
Simulation and analysis of a gas insulated switchgear explosion accident caused by a failure of high-voltage circuit breaker in a thermal power plant |
title_short |
Simulation and analysis of a gas insulated switchgear explosion accident caused by a failure of high-voltage circuit breaker in a thermal power plant |
title_full |
Simulation and analysis of a gas insulated switchgear explosion accident caused by a failure of high-voltage circuit breaker in a thermal power plant |
title_fullStr |
Simulation and analysis of a gas insulated switchgear explosion accident caused by a failure of high-voltage circuit breaker in a thermal power plant |
title_full_unstemmed |
Simulation and analysis of a gas insulated switchgear explosion accident caused by a failure of high-voltage circuit breaker in a thermal power plant |
title_sort |
simulation and analysis of a gas insulated switchgear explosion accident caused by a failure of high-voltage circuit breaker in a thermal power plant |
publisher |
Wiley |
series |
The Journal of Engineering |
issn |
2051-3305 |
publishDate |
2019-03-01 |
description |
This study analyses a gas insulated switchgear explosion accident caused by a failure of the circuit breaker (CB) in a thermal power plant, which resulted in the explosion of the CB and the burning of the potential transformer (PT). Through X-ray detection and disassemble examination of the damaged CB, it is found that the A-phase moveable contact was not opened completely. After analysing the voltage waveform obtained from the phasor measurement unit recorder system, it is speculated that this failure is caused by the process of repeated arc strike. For verification and further analysis, the fault process is simulated in the EMTP; the arc is properly modelled by an extended KEMA's equation-based model which is proposed in this study. The simulation results match well with the actual situation; the contact gap would be repeated breakdown because its breakdown voltage is reduced, and the very fast transient overvoltage (VFTO) would be generated in these repeated strike processes. Due to the steep front and high amplitude of VFTO, the insulation of the PT would be damaged and led to the occurrence of PT short-circuit fault. The current would increase rapidly and causes the CB to explode subsequently. |
topic |
circuit breakers potential transformers overvoltage power system measurement overvoltage protection arcs (electric) EMTP gas insulated switchgear fault diagnosis thermal power stations thermal power plant damaged CB A-phase moveable contact voltage waveform phasor measurement unit recorder system repeated arc strike simulation results breakdown voltage repeated strike processes PT short-circuit fault gas insulated switchgear explosion accident high-voltage circuit breaker failure potential transformer X-ray detection disassemble examination EMTP extended KEMA equation-based model very fast transient overvoltage contact gap VFTO |
url |
https://digital-library.theiet.org/content/journals/10.1049/joe.2018.5468 |
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