Transient Voltage UWB Online Monitoring System for Insulation Failure Analysis and Fault Location of GIL

Ziwei Zhang, Dengwei Ding, Liang He, Weidong Liu, Cuifen Bai and Junjun Liu
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Ziwei Zhang: Sichuan Energy Internet Research Institute, Tsinghua University, Chengdu 610213, China
Dengwei Ding: Sichuan Energy Internet Research Institute, Tsinghua University, Chengdu 610213, China
Liang He: Sichuan Energy Internet Research Institute, Tsinghua University, Chengdu 610213, China
Weidong Liu: Sichuan Energy Internet Research Institute, Tsinghua University, Chengdu 610213, China
Cuifen Bai: Hebei Key Laboratory of Safety Monitoring and Mining Equipment, North China Institute of Science and Technology, Langfang 065201, China
Junjun Liu: Maintenance Center, State Grid Chengdu Power Supply Company, Chengdu 610041, China

Energies, 2021, vol. 14, issue 16, 1-11

Abstract: Transient voltage generated in ultra-high voltage (UHV) transmission system has a severe impact on the insulation state of gas-insulated transmission lines (GIL). In order to monitor the transient voltage process occurring in UHV GIL during operation, this paper constructs a transient voltage ultra-wideband (UWB) online monitoring system based on capacitive voltage division. This system has been applied in an 1100 kilovolt (kV) GIL utility tunnel project. It can be used to analyze the characteristics of the recorded transient voltage waveforms for distinguishing different types of insulation failure. In this paper, through the case studies in time domain and time–frequency domain, the case of SF 6 gap breakdown and that of post insulator flashover have differentiated characteristics in instantaneous frequency. Additionally, a case of secondary discharge is successfully estimated through the time–frequency distribution of the transient voltage. In order to find the malfunctioning chamber of GIL rapidly, a two-terminal TW-based fault location method based on this monitoring system is developed in this paper. The case study validates the locating accuracy which directly support for shortening the maintenance time of GIL.

Keywords: UHV GIL; transient voltage; on-line monitoring system; UWB voltage sensing (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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