Lightning Current Distribution of Insulated Ground Wire in 500 kV Transmission Line

doi:10.11930/j.issn.1004-9649.201606210

Abstract

Abstract: Ground wire icing severely affects the safeoperation of overhead transmission line in medium and heavyicing area. Direct Current (DC) melting ice is one of the effectivemeasures to solve overhead transmission line icing. When lightning stroke failure of the transmission line occurs, the lightning current distribution between insulated ground wire and towers decide the top potential of tower, which has impacts on lightning protection level and the grounding of transmission line. This paper uses the electromagnetic transient analysis program EMTP to calculate and analyze the lightning current distribution. The results show that the majority of lightning current pass through the towers in 500 kV transmission line, and lightning current amplitude, horizontal span of tower and grounding resistance have a greater impact on shunt coefficient of insulated ground wire and tower. This research has a significant theoretically value to tower shunt coefficient, potential's increase tower and economical design of power system.

Key words: transmission line, insulated ground wire, lightning current distribution, EMTP, shunt coefficient

CLC Number:

TM752

TANG Tao, XIANG Chengming. Lightning Current Distribution of Insulated Ground Wire in 500 kV Transmission Line[J]. Electric Power, 2018, 51(1): 64-70.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.201606210

https://www.electricpower.com.cn/EN/Y2018/V51/I1/64

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