Tower Air-gaps discharge characteristics and insulation coordination for UHV AC double-circuit line

The Journal of Engineering

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[1] State Key Laboratory of Power Grid Environmental Protection, China Electric Power Research Institute, Wuhan 430074, People's Republic of China;

关键词: power transmission lines;    poles and towers;    insulators;    lightning protection;    air gaps;    electrodes;    overvoltage protection;    power transmission protection;    distance 7.2 m;    distance 6.7 m;    distance 6.5 m;    distance 2.9 m;    time 1000.0 mus;    discharge voltage gradient;    UHV AC double-circuit tower;    lightning impulse;    wavefront switching impulse voltage;    inverse V-string;    tower air-gap discharge characteristics;    lightning protection air-gap configurations;    phase air-gap configurations;    double-circuit UHV AC power transmission line system;    tower frame discharge testing;    insulation coordination;    power frequency voltage;    discharge characteristics curves;    high-voltage electrode;    inverse V-type insulator tower air-gaps configuration;    UHV AC double-circuit line;   

DOI  :  10.1049/joe.2018.8720

来源: publisher

【 摘 要 】

In order to give out inverse V-type insulator tower air-gaps configuration of double-circuit UHV AC power transmission line, different distance air-gaps from high-voltage electrode to tower frame discharge tests of inverse V-string are carried out. Discharge characteristics curves of power frequency voltage, 1000 μs long wave-front switching impulse voltage, and lightning impulse of UHV AC double-circuit tower are obtained. Results show that the 50% discharge voltage gradient of bottom phase air-gaps is higher than middle phase. 1000 μs wave-front switching impulse 50% discharge voltage gradient of bottom phase air-gaps is 4.6% higher than the middle phase. Based on the test results and the characters of operating voltage and overvoltage of UHV AC power transmission system, the UHV AC double-circuit tower inverse V-type insulator air-gaps configuration is proposed. The air-gap configurations of power frequency voltage and switching overvoltage are 2.9 and 6.5 m, and the lightning protection air-gaps are 6.7 and 7.2 m, in mountains and plains.

【 授权许可】

CC BY