Causes of discharge fault of basin insulator of gas insulated metal enclosed switchgear

LIU Gaoming; CHEN Guojing; SUN Qingfeng; MA Jianyan; LI Xianliang; XU Ting

doi:10.11973/lhjy-wl202312007

PHYSICAL TESTING AND CHEMICAL ANALYSIS PART A:PHYSICAL TESTING > 2023 > 59(12): 30-33,62. > DOI: 10.11973/lhjy-wl202312007

LIU Gaoming, CHEN Guojing, SUN Qingfeng, MA Jianyan, LI Xianliang, XU Ting. Causes of discharge fault of basin insulator of gas insulated metal enclosed switchgear[J]. PHYSICAL TESTING AND CHEMICAL ANALYSIS PART A:PHYSICAL TESTING, 2023, 59(12): 30-33,62. DOI: 10.11973/lhjy-wl202312007

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Causes of discharge fault of basin insulator of gas insulated metal enclosed switchgear

1. State Grid Huzhou Power Supply Company, Huzhou 313000, China;
2. Shandong Taikai High Voltage Switchagear Co., Ltd., Taian 217000, China;
3. Zhejiang Electric Power Boiler & Pressure Vessel Supervision and Inspection Institute Company Limited, Hangzhou 310014, China;
4. Hangzhou Kaida Electric Power Construction Co., Ltd., Hangzhou 311100, China;
5. State Grid Lishui Power Supply Company, Lishui 323000, China;
6. State Grid Hangzhou Power Supply Company, Hangzhou 310009, China

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Received Date: January 11, 2023

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Abstract

A discharge fault occurred on the basin insulator of gas insulated metal enclosed switchgear in a 220 kV substation. The causes of the discharge fault were analyzed by means of macroscopic inspection, penetration detection and X-ray detection. The influence of different pouring gaps on the electric field under high voltage environment was calculated by simulation software. The results show that the pouring gap would distort the electric field of the basin insulator. Under the condition of equal gap depth and arc length, the smaller the width of the pouring gap was, the greater the distortion of the electric field was, and the easier the gap was to be broken down, so that the basin insulator was prone to flashover.
- gas insulated metal enclosed switchgear,
- basin insulator,
- pouring gap,
- coefficient of expansion,
- electric field distribution

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