Characteristics of the Partial Discharge in the Development of Conductive Particle-Initiated Flashover of a GIS Insulator

Junping Zhao, Zhengjie An, Bin Lv, Zhicheng Wu and Qiaogen Zhang
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Junping Zhao: State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an 710049, China
Zhengjie An: State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an 710049, China
Bin Lv: State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an 710049, China
Zhicheng Wu: State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an 710049, China
Qiaogen Zhang: State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an 710049, China

Energies, 2020, vol. 13, issue 10, 1-11

Abstract: Conductive particles are one of the most important defects which can greatly degrade the performance of gas-insulated metal-enclosed switchgear (GIS). Many efforts have been made to clarify the influence on the withstand voltage, understand the flashover mechanism, and build a comprehensive model to describe the particle-initiated flashover. In this study, a partial discharge (PD) signal detected through a photomultiplier (PMT) and recorded by a high-speed data acquisition (DAQ) system was used to analyze the discharge development of a conductive particle-contaminated GIS insulator under constant high AC voltage. An additional PMT was used as a reference to eliminate the dark count of the PMT and the data collection method of a DAQ system was optimized to capture the pulse waveform of each PD to obtain detailed physical information. Spectra of the PD pulse amplitude over pulse width, PD counts within various amplitude ranges over time and phase resolved partial discharge (PRPD) patterns of the PDs in different stages are obtained through the captured PD waveforms. Characteristics of the PDs from the application of the high AC voltage up to the flashover of the insulator were then analyzed, and it was found that the features of the PDs in the near-flashover stage were significantly different to the previous stages.

Keywords: partial discharge; insulation defect; photomultiplier tube; PRPD pattern; flashover (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: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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