Relationship Between Lightning Overvoltage and Impulse Grounding Resistance of 500 kV Transmission Line

doi:10.11930/j.issn.1004-9649.201707066

Abstract

Abstract: In order to consider the dynamic dispersion process of lightning current in lightning protection line, tower, grounding grid and soil after lightning strike transmission line, the full-wave electromagnetic transient model of transmission line-pole-grounding grid is established to calculate the impact grounding resistance and counter overvoltage. Based on the full-wave electromagnetic transient model, from the concept of impact grounding, the influence of soil resistivity, lightning current wavefront time and amplitude on the transmission line is directly reflected on the lightning overvoltage, and the lightning overvoltage and the grounding resistance are calculated. The formula is fitted. Studies have shown that both the reduction of the wavefront time and the increase of the soil resistivity increase the impact grounding resistance value and the lightning overvoltage. The impact grounding resistance value regardless of the spark effect is independent of the lightning current amplitude, and the lightning overvoltage increases proportionally with the lightning current. When designing the grounding grid, consider the effective length of the grounding grid ray that can reduce the lightning overvoltage value.

Key words: 500 kV transmission line, lightning overvoltage, integrated model, impact grounding resistance, lightning protection

CLC Number:

TM863

GAN Yan, GU Dewen, ZHANG Chang, YAO Yong, HUANG Ruiying. Relationship Between Lightning Overvoltage and Impulse Grounding Resistance of 500 kV Transmission Line[J]. Electric Power, 2018, 51(9): 118-125.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.201707066

https://www.electricpower.com.cn/EN/Y2018/V51/I9/118

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