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Ground Fault Current Variation of 22.9kV Multi Neutral Grounded Distribution System with CD Type Superconducting Cable  

Lee, Jong-Bae ((주)그린넷파워 엔지니어링팀)
Hwang, Si-Dole (한전전력연구원)
Sohn, Song-Ho (한전전력연구원)
Lee, Geun-Joon (충북과학대학 전기에너지시스템학과)
Publication Information
The Transactions of The Korean Institute of Electrical Engineers / v.56, no.6, 2007 , pp. 993-999 More about this Journal
Abstract
This paper discusses the effects of CD type superconducting cable operation in 22.9kV multi neutral grounded distribution system during L-G fault and counterplans to power system protection. In case of using the 3-phase CD-type superconducting cable, the inductance of superconducting cable system would be decreased due to the current of shield part of superconducting cable, which is opposite direction and nearly equal value with respect to main superconductor. However, when the shield circuit system is operated in shorted state, shield current decreases faulted ground current and give effects to power system protection scheme. This study examines the phenomena of single line to ground fault case in above mentioned system using the EMTDC program and discusses the right operation method of superconducting shield.
Keywords
HTS cable; multi neutral gounded; ground fault current; shield layer;
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