Simulation of Inner-Potential Difference of Grounding Grid

doi:10.11930/j.issn.1004-9649.2014.3.111.4

Abstract

Abstract: With the increasing of power system capacity, the grounding short-circuit current that is withstanded by grounding grids of substations becomes higher and higher. The inner-potential difference may cause damage to cable and secondary equipment. A simulation model is presented in this paper. The grounding simulation software CDEGS is used to obtain the inner-potential difference under different conditions. The simulation results show that the lower soil resistivity leads to higher inner-potential difference, and the inner-potential difference of a cooper conductor is lower than the steel one’s; the larger grounding grid has the higher inner-potential difference. When inner-potential difference is greater than 1.4 kV, the cross-section of the steel conductor should be increased, or the coppered steel grounding grid should be chosen.

Key words: grounding grid, inner-potential difference, simulation analysis

CLC Number:

TM862

ZHANG Ting, ZHANG Xiao-liang. Simulation of Inner-Potential Difference of Grounding Grid[J]. Electric Power, 2014, 47(3): 111-115.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.2014.3.111.4

https://www.electricpower.com.cn/EN/Y2014/V47/I3/111

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