Switching Impulse Flashover Characteristics of Live Working Air Gaps in High Altitude Areas and Discharge Voltage Correction
Fang Yaqi1, Wang Linong2, Li Rui3, Liu Kai4, Song Bin2
1. School of Electrical and Electronic Engineering Hubei University of Technology Wuhan 430068 China; 2. School of Electrical Engineering and Automation Wuhan University Wuhan 430072 China; 3. Wuhan Power Supply Company State Grid Hubei Electric Power Co. Ltd Wuhan 430050 China; 4. China Electrical Power Research Institute Wuhan 430074 China
Abstract Since the air gap discharge voltage in high-altitude areas is significantly lower than that in low-altitude areas, the minimum approach distance required for live working increases. In order to ensure the safety operation of live working in high altitude areas, the switching impulse discharge tests are conducted on 750kV double-circuit tower in areas with altitude of 2 000m, 3 000m and 4 300m, and the discharge characteristics of equipotential worker-tower gap and bundle conductor-ground potential worker gap are obtained. The influences of altitude and worker's posture on the discharge characteristics of live working gaps are analyzed. Based on the test data, the applicability of the m-method recommended by IEC standard is evaluated. The results show that the existing method is not suitable for discharge voltage correction of live working gaps in areas with altitude above 3 000m. Finally, a modified m-method is proposed based on test data, which can be used to correct switching impulse discharge voltage of live working gaps at the altitude of 3 000~4 300m. In addition, the minimum approach distance of live working in areas at the altitude of 2 000~4 000m is determined.
Fang Yaqi,Wang Linong,Li Rui等. Switching Impulse Flashover Characteristics of Live Working Air Gaps in High Altitude Areas and Discharge Voltage Correction[J]. Transactions of China Electrotechnical Society, 2020, 35(12): 2681-2688.
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2020, Vol. 35 
