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http://dx.doi.org/10.5370/KIEE.2011.60.3.479

Proposition of Improved Neutral Grounding Method and Analytical Evaluation on Practicality in Underground Distribution System  

Jeong, Seok-San (원광대 대학원 전기공학과)
Lee, Jong-Beom (원광대 공대 전기정보통신공학부)
Jang, Seong-Whan (원광대 공대 전기정보통신공학부)
Kim, Yong-Kap (원광대 공대 전기정보통신공학부)
Kwon, Shin-Nam ((주)현대이앤아이)
Publication Information
The Transactions of The Korean Institute of Electrical Engineers / v.60, no.3, 2011 , pp. 479-485 More about this Journal
Abstract
In 22.9kV underground distribution system, power cables are provided with multiple-point ground in which each neutral line of the distribution cable(A, B, C phases) and three-wire common grounded at every connecting section. But in such grounding methods, circulating current flows between the neutral wire and grounding wire. And power loss due to circulating current also occurs in all conductors. Therefore it is getting necessary reducing circulating current in underground distribution system. This paper presents improved grounding method to overcome such problems. The proposed grounding method eliminates circulating current in the neutral line effectively and is verified that there is no electrical problem or any ineffectiveness of operating protection systems. These analyses are carried out by EMTP/ATPDraw to compare each grounding methods in steady and transient state. This grounding method suggested in this paper can be applied on real distribution system after field tests considering elimination of circulating current was implemented.
Keywords
Circulating current; Underground cable; Neutral wire; Combined distribution system; Grounding method; EMTP;
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