Affecting Factors of Short-Circuit Currents of Busbar at UHV AC Substation

doi:10.11930/j.issn.1004-9649.201804062

Abstract

Abstract: The affecting factors of short-circuit currents of 1 000 kV and 500 kV bus-bar at UHV AC substation are analyzed based on the components of corresponding self-impedance. And then the proportions of all factors to the short-circuit currents at 1 000 kV bus-bar and 500 kV bus-bar are proposed and determined, including the configuration of 1 000 kV power grid, the main transformer and the configuration of 500 kV power grid. The results indicate that the short-circuit currents of 1 000 kV bus-bar are greatly affected by the configuration of 1 000 kV power grid. The 500 kV power grid and the main transformer have a dominant influence on the short-circuit currents of 500 kV bus-bar at UHV AC substation. The results can provide theoretical support and decision-making reference for the optimization of short-circuit limit.

Key words: UHV, AC substation, short-circuit current, self-impedance, equivalent circuit

CLC Number:

TM713

TANG Jinrui, YANG Fanqi, HOU Tingting, HUANG Juanjuan, SHAO Chong, WU Xiaoshan. Affecting Factors of Short-Circuit Currents of Busbar at UHV AC Substation[J]. Electric Power, 2019, 52(4): 66-73.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.201804062

https://www.electricpower.com.cn/EN/Y2019/V52/I4/66

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