Research on Influencing Factors of Lightning Back-Strike Intruding Overvoltage of 500 kV Substation

doi:10.11930/j.issn.10.11930.2015.6.72

Abstract

Abstract: In order to reasonably choose lightning intruding overvoltage protection measures, the influencing strength(expressed by the significance level F) and sensitivity range of the main factors of lightning back-strike intruding overvoltage are studied with orthogonal experimental design (OED) method and ATP-EMTP simulation by taking a 500 kV substation as an example. The calculated results show that the ratio of F values between system operation and system parameters, including the distance between No 1 and No 0 tower, the installation location of CVT, the distance between arrester and equipment, the lightning point and tower impulse grounding resistance, are 5.56, 2.13, 1.00, 4.64, 24.58, 7.58 respectively. Meanwhile, several measures, including lowering the impulse grounding resistance of tower from 10 Ω to 5 Ω, setting the distance between No 1 and No 0 tower as around 200 m, and improving the lightning protection of the incoming line segment of 0~900 m, can significantly reduce the level of lightning back-Strike intruding overvoltage.

Key words: substation, lightning intruding wave, overvoltage, ATP-EMTP, multiple-wave impedance model, orthogonal experimental design (OED)

CLC Number:

TM863

WANG Jiannan, JIANG Kun, LUO Renyi. Research on Influencing Factors of Lightning Back-Strike Intruding Overvoltage of 500 kV Substation[J]. Electric Power, 2015, 48(6): 72-79.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.10.11930.2015.6.72

https://www.electricpower.com.cn/EN/Y2015/V48/I6/72

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