Analyses of the Impulse Characteristics of Tower Grounding Devices Based on Electromagnetic Field

doi:10.11930/j.issn.1004-9649.2014.8.83.4

Abstract

Abstract: Potential rise of the transmission line towers depends on the grounding resistance when the lines or towers are stricken by lightning,which determines the overvoltage between the terminals of an insulator string and the performance against lightning strike of the transmission lines. Impulse characteristics of the grounding conductors manifest as spark effect and inductive effect, which make it different from the characteristics of the power frequency. Based on electromagnetic theory, a mathematical model was built to calculate the impulse grounding resistance of a typical grounding grid for towers with different length in different soil resistivity. The accuracy of the proposed model was verified by model tests and a comparison with the calculated grounding resistance at power frequency by the well-known grounding software CDEGS further reveals the difference between power and impulse characteristics, and confirms that there is an effective length for grounding system under impulse current.

Key words: grounding system, impulse characteristic, electromagnetic field, simulation analyses, tower, CDEGS, calculation model

CLC Number:

TM83

ZHU Chang-cheng, XING Peng-xiang, LU Hai-liang, LAN Lei, FENG Zhi-qiang. Analyses of the Impulse Characteristics of Tower Grounding Devices Based on Electromagnetic Field[J]. Electric Power, 2014, 47(8): 83-87.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.2014.8.83.4

https://www.electricpower.com.cn/EN/Y2014/V47/I8/83

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