Design and Engineering Practice of Substation Grounding

doi:10.11930/j.issn.1004-9649.2014.11.40.5

Abstract

Abstract: In order to meet the requirements for grounding grid to adapt to developments of power system, the security analysis is becoming the basis of grounding grid design. Taking the design and construction of a typical 220 kV substation with high soil resistivity as an example, based on field measurement and lab simulation, the relationship between the security of grounding grid and investment budget on different stages is analyzed and both security and economic factors are considered into the grounding design. On the premise that the parameters of the grounding grid, such as potential rise of conductors, field potential difference, field step voltage and touch voltage, satisfy the requirements of primary and secondary devices for operating and personal safety, the choice of design values of grounding impedances should be scientific to achieve the economy improvement. Accordingly, the balance of safety and economy of the design is obtained. The method of grounding grid design based on safety and economic analysis is thus developed.

Key words: grounding grid, parameter design, security property, economic analysis, substation, the simulation calculation, impedance, soit

CLC Number:

TM863

LI Qian, ZHANG Bo. Design and Engineering Practice of Substation Grounding[J]. Electric Power, 2014, 47(11): 40-45.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.2014.11.40.5

https://www.electricpower.com.cn/EN/Y2014/V47/I11/40

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