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

Energies

Zhengjie An¹  Bin Lv¹  Qiaogen Zhang¹  Junping Zhao¹  Zhicheng Wu¹ 

[1] State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an 710049, China;

关键词: partial discharge;    insulation defect;    photomultiplier tube;    PRPD pattern;    flashover;   

DOI  :  10.3390/en13102481

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown