Influence of Ground Material on the Impulse Ground Impedance of Tower’s Grounding Devices

doi:10.11930/j.issn.1004-9649.2016.10.067.07

Abstract

Abstract: Grounding devices and soil resistivity affect the diffusion process when lightning current flows through grounding devices, and inherently affect the impulse grounding impedance of grounding devices. Based on the theory of electromagnetic fields and circuit method, this paper calculates the grounding impedance with different grounding materials, different lengths and diameters of grounding body, and different soil resistivity by using self-developed software. The time-domain voltage waveform is used to analyze the mechanism of the impulse grounding impedance influenced by above mentioned parameters. The analyzing results show that the magnetic permeability of grounding body has a great influence on the impulse grounding impedance. Under invariable cost of the grounding body, the longer grounding body of copper grounding device will lead the smaller impulse grounding impedance. Due to the limited effective length, the impulse grounding impedance reduction is not obvious with the increase of grounding body of steel grounding device. With the increase of soil resistivity, the impulse grounding impedance of copper grounding device increases linearly, but the impulse grounding impedance of steel grounding device is flattened out.

Key words: transmission line, grounding devices, impulse grounding impedance, time-domain voltage waveform, grounding material, the length and diameter of grounding body, soil resistivity

CLC Number:

TM86

CAO Fangyuan, SHI Weidong, KANG Peng, ZHANG Bo. Influence of Ground Material on the Impulse Ground Impedance of Tower’s Grounding Devices[J]. Electric Power, 2016, 49(10): 67-73.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.2016.10.067.07

https://www.electricpower.com.cn/EN/Y2016/V49/I10/67

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