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Frontiers of Electrical and Electronic Engineering

ISSN 2095-2732

ISSN 2095-2740(Online)

CN 10-1028/TM

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Front Elect Electr Eng Chin    2010, Vol. 5 Issue (4) : 501-504    https://doi.org/10.1007/s11460-010-0096-9
RESEARCH ARTICLE
A magnetic detecting and evaluation method of substation’s grounding grids with break and corrosion
Yang LIU(), Xiang CUI, Zhibin ZHAO
School of Electrical and Electronic Engineering, North China Electric Power University, Baoding 071003, China
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Abstract

The grounding grid buried in the earth will become a hidden danger to the safety of substations due to some faults of breaks or thinner conductors in corrosion. A novel method to get accurate status of grounding grid was proposed based on measuring magnetic induction intensity. The basic structure of grounding grid without working drawing was concluded, and the positions and the status of faults were diagnosed by this method. The completed detecting system, including hardware device of data measurement, diagnosis, and analysis software, was introduced concisely. The results of simulations and applications show that this method is simple and effective in the practical engineering.
Keywords grounding grid      fault status      magnetic induction intensity      diagnosis     
Corresponding Author(s): LIU Yang,Email:hdwlly@163.com   
Issue Date: 05 December 2010
 Cite this article:   
Yang LIU,Xiang CUI,Zhibin ZHAO. A magnetic detecting and evaluation method of substation’s grounding grids with break and corrosion[J]. Front Elect Electr Eng Chin, 2010, 5(4): 501-504.
 URL:  
https://academic.hep.com.cn/fee/EN/10.1007/s11460-010-0096-9
https://academic.hep.com.cn/fee/EN/Y2010/V5/I4/501
Fig.1  Grounding grid of a 220 kV substation
Fig.2  Calculation results of . (a) Distributions of in the whole area; (b) distributions of in local area
Fig.3  Measuring systems
Fig.4  Coordinate series built by injecting point
Fig.5  Measuring results of magnetic induction intensities. (a) Distributions of of judging conductors in direction; (b) distributions of of judging conductors in direction
Fig.6  A grounding grids of a 110 kV substation
Fig.7  Distributions of surface magnetic induction intensities
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