Repeated Strike Process During Disconnector Operation in Ultra-High Voltage Gas-Insulated Switchgear

GUAN Yonggang (关永刚); CAI Yuanji (蔡元纪); CHEN Weijiang (陈维江); LIU Weidong (刘卫东); LI Zhibing (李志兵); YUE Gongchang (岳功昌); ZHANG Junmin (张俊民)

doi:10.1088/1009-0630/18/3/06

Plasma Science and Technology > 2016 > 18(3): 247-253. > DOI: 10.1088/1009-0630/18/3/06

GUAN Yonggang (关永刚), CAI Yuanji (蔡元纪), CHEN Weijiang (陈维江), LIU Weidong (刘卫东), LI Zhibing (李志兵), YUE Gongchang (岳功昌), ZHANG Junmin (张俊民). Repeated Strike Process During Disconnector Operation in Ultra-High Voltage Gas-Insulated Switchgear[J]. Plasma Science and Technology, 2016, 18(3): 247-253. DOI: 10.1088/1009-0630/18/3/06

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Repeated Strike Process During Disconnector Operation in Ultra-High Voltage Gas-Insulated Switchgear

1State Key Lab of Control and Simulation of Power System and Generation Equipments, Department of Electrical Engineering, Tsinghua University, Beijing 100084, China 2State Grid Corporation of China, Beijing 100031, China 3China Electric Power Research Institute, Beijing 100192, China 4School of Automation Science and Electrical Engineering, Beihang University, Beijing 100191, China

Funds: supported in part by National Natural Science Foundation of China (No. 51277106) and in part by the National Basic Research Program of China (973 Program) (No. 2011CB209405)

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Received Date: September 08, 2015

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Abstract

Abstract

Very fast transient over-voltage (VFTO), induced by disconnector operations in gas-insulated switchgears, has become the limiting dielectric stress at ultra-high voltage levels. Much work has been done to investigate single-strike waveforms of VFTO. However, little study has been carried out investigating the repeated strike process, which would influence VFTO significantly. In this paper, we carried out 450 effective experiments in an ultra-high voltage test circuit, and conducted calculations through the Monte Carlo simulation method, to investigate the repeated strike process. Firstly, the mechanism of the repeated strike process is proposed, based on the ex¬perimental results. Afterwards, statistical breakdown characteristics of disconnectors are obtained and analyzed. Finally, simulations of the repeated strike process are conducted, which indicate that the dielectric strength recovery speed and polarity effect factor have a joint effect on VFTO. This study enhances the understanding of the nature of VFTO, and may help to optimize the disconnector designed to minimize VFTO.

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References

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