Calculation of Equivalent Resistance for Ground Wires Twined with Armor Rods in Contact Terminals

Gang Liu, Deming Guo, Pengyu Wang, Honglei Deng, Xiaobin Hong and Wenhu Tang
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Gang Liu: School of Electric Power, South China University of Technology, Guangzhou 510640, China
Deming Guo: School of Electric Power, South China University of Technology, Guangzhou 510640, China
Pengyu Wang: School of Electric Power, South China University of Technology, Guangzhou 510640, China
Honglei Deng: School of Electric Power, South China University of Technology, Guangzhou 510640, China
Xiaobin Hong: School of Mechanical & Automotive Engineering, South China University of Technology, Guangzhou 510640, China
Wenhu Tang: School of Electric Power, South China University of Technology, Guangzhou 510640, China

Energies, 2018, vol. 11, issue 4, 1-24

Abstract: Ground wire breakage accidents can destroy the stable operation of overhead lines. The excessive temperature increase arising from the contact resistance between the ground wire and armor rod in the contact terminal is one of the main reasons causing the breakage of ground wires. Therefore, it is necessary to calculate the equivalent resistance for ground wires twined with armor rods in contact terminals. According to the actual distribution characteristics of the contact points in the contact terminal, a three-dimensional electromagnetic field simulation model of the contact terminal was established. Based on the model, the current distribution in the contact terminal was obtained. Subsequently, the equivalent resistance of a ground wire twined with the armor rod in the contact terminal was calculated. The effects of the factors influencing the equivalent resistance were also discussed. The corresponding verification experiments were conducted on a real ground wire on a contact terminal. The measurement results of the equivalent resistance for the armor rod segment showed good agreement with the electromagnetic modeling results.

Keywords: ground wire; armor rod; contact resistance; conductive bridge; multiple contact points model; skin effect; current diffusion (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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