Switching Impulse Test of UHV Live Working Insulating Tool and Experimental Electrode Optimization

doi:10.11930/j.issn.1004-9649.202203063

Abstract

Abstract: At present, the electrode arrangement still follows the low voltage level standard when the UHV live-working insulating tools are tested for operation impulse withstand voltage. However, the test voltage and the discharge interval are greatly increased, and discharge often occurs in the non-test channels such as the interval between insulating tools, and the interval between test electrode and the earth or surrounding frames. For this reason, standard wave switching impulse tests are conducted on the insulating tools used for live-working under typical working conditions and test conditions, and the discharge paths under test conditions are counted. An optimization scheme of using 8-bundle U-shaped analog wires is proposed, and corresponding tests are conducted for verification. The results show that using the 8-bundle U-shaped analog wires can significantly reduce the probability of dispersive discharge in non-test channels. The horizontal spacing of the test specimens shall not be less than 5m due to the presence of air gap arcing. After the test electrode is improved, the discharge voltage of the 6.3-m-long insulating rod is 2417 kV, which is 6.9% higher than that of the standard electrode, 32.1% higher than the minimum discharge voltage under typical working conditions. When the insulating tools are tested for withstand voltage, it is recommended to correct the test voltage according to the withstand voltage requirements of the working conditions.

Key words: UHV, live working, insulating tool, switching impulse, discharge characteristics, electrode optimization

YU Guangkai, LIU Ting, ZHU Kai, NIE Lin, LIANG Jiakai. Switching Impulse Test of UHV Live Working Insulating Tool and Experimental Electrode Optimization[J]. Electric Power, 2022, 55(8): 143-150.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202203063

https://www.electricpower.com.cn/EN/Y2022/V55/I8/143

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