Partial Discharge Characteristics of Metal Particles on Spacer Surface in GIS Based on High Sensitivity Measurement

被引：0

作者：

Xu Y. ^{[1
,4
]}

Liu W. ^{[2
]}

Chen W. ^{[3
]}

Yang J. ^{[5
]}

Zhao K. ^{[5
]}

Liu Y. ^{[5
]}

机构：

[1] School of Electrical & Electronic Engineering, North China Electric Power University, Beijing

[2] Department of Electrical Engineering, Tsinghua University, Beijing

[3] State Grid Corporation of China, Beijing

[4] China Electric Power Research Institute, Beijing

[5] State Grid Jiangsu Electric Power Research Institute, Nanjing

来源：

Gaodianya Jishu/High Voltage Engineering | 2019年 / 45卷 / 09期

基金：

国家重点研发计划;

关键词：

GIS; Micro-metal particles; Partial discharge; Pulse current method; Spacer surface; Ultra-high frequency method;

D O I：

10.13336/j.1003-6520.hve.20190831003

中图分类号：

学科分类号：

摘要：

In recent years, flashover faults frequently occur in GIS insulators, and micro-metal particles on the surface of the insulator are generally considered to be flashover inducement. However, the partial discharge level of the micro-metal particles of different lengths on the surface of GIS insulator under the actual operating voltage is not known yet. Consequently, based on the pulse current mutual reference method, we established a measurement system for highly sensitive GIS pulse current partial discharge which had a PD resolution of up to 0.02 pC. Near the actual operating voltage level, the partial discharge phenomenon of 0.5 mm, 2 mm, 5 mm, 8 mm and 10 mm micro-metal particles on the surface of 126 kV GIS spacer were observed. It is found that the partial discharge of metal particles below 5 mm on the surface of the insulator is less than 1 pC, which is difficult to detect by the UHF method. The influences of the length and position of micro-metal particles on the surface on the discharge characteristics can be revealed. The shorter the particle length is, the lower the field strength of the insulator surface and the lower the discharge amount will be. It is proven that there exist the shortcomings of the current PD test and the UHF method for the detection of mi-cro-metal particles on the surface of GIS insulator. © 2019, High Voltage Engineering Editorial Department of CEPRI. All right reserved.

引用

页码：2707 / 2714

页数：7

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