Lightning Discharge Character of Shunt Gap Used for 220 kV Glass Insulator String

doi:10.11930/j.issn.10.11930.2015.8.92

Abstract

Abstract: Shunt gap for insulators is beneficial for protecting insulators and improving power supply reliability. However, there exist failure examples during shunt gap application. Lightning discharge test of shunt gap with typical geometry parameters for 220 kV glass insulators is performed to investigate relationship between geometry size and protection effect. The U50 discharge voltage of the gap is found and the arc path is analyzed. Possible explanation of protection failure is proposed. Test results indicate that shunt gap protection effect could be improved with smaller value of Z/Z0 and with larger value of Xc and Xp. Protection effect stabilizes when the value of Z/Z0 is smaller than 0.875. Arc exists at both sides of the gap under the lightning voltage. The arc bends to the insulator by the radial electrical field, which might be the main reason of protection failure under U50.

Key words: glass insulator, shunt gap, geometry parameter, lightning discharge, discharge character, discharge path, protection effect

CLC Number:

TM85

LI Te, ZHOU Guoliang, LIU Yan, XIE Cheng, ZHANG Ximing. Lightning Discharge Character of Shunt Gap Used for 220 kV Glass Insulator String[J]. journal1, 2015, 48(8): 92-96.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.10.11930.2015.8.92

https://www.electricpower.com.cn/EN/Y2015/V48/I8/92

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