NDLI: Optimal design analysis of grounding grids for substations built in nonuniform soil

Content Provider	IEEE Xplore Digital Library
Author	Weimin Sun Jinliang He Yanqing Gao Rong Zeng Weihan Wu Qi Su
Copyright Year	2000
Description	Author affiliation: Shandong Electr. Power Bur., China (Weimin Sun)
Abstract	The optimal design of grounding system can ensure the safety of a substation. The influences of reflective coefficient of double-layer soil and the thickness of top-layer soil and the grounding grid area on the optimum arrangement of grounding system were analyzed by a numerical method. It states the optimum compression ratio (OCR) should be determined by the target function of touch voltage reaching the minimum value. The OCR decreases with the increase of reflective coefficient, when the soil resistivity of the bottom-layer soil is smaller than that of upper-layer soil, the arranged horizontal conductors are more uniform than that when the soil resistivity of the bottom-layer soil is higher than that of upper-layer soil. The formulae to calculate the OCR of double-layers soil structure are obtained from analysis results, which can provide reference for engineers to design the grounding systems of substations with high safety.
Starting Page	1455
Ending Page	1460
File Size	503978
Page Count	6
File Format	PDF
ISBN	0780363388
DOI	10.1109/ICPST.2000.898183
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2000-12-04
Publisher Place	Australia
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Grounding Substations Soil Conductors Safety Voltage Power system reliability Surface resistance Optical character recognition software Conductivity
Content Type	Text
Resource Type	Article

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