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Analysis of Switching Overvoltage in 345kV Underground and Combined Transmission Systems  

정채균 (원광대 전기공학과)
이종범 (원광대 전기전자 및 정보공학부)
강지원 (한전 전력연구원)
Publication Information
The Transactions of the Korean Institute of Electrical Engineers A / v.52, no.12, 2003 , pp. 713-721 More about this Journal
Abstract
This paper analyzes the switching overvoltage occurred on 345kV underground power cable system as well as combined transmission system using EMTP. Cable length and closing time, preinsertion resistance have effect on switching overvoltage. Therefore, this paper analyzes the switching overvoltage occurred on conductor and sheath with change of those parameters. Specially, the cross bonding position becomes discontinuity point because of the difference between surge impedance of metal sheath and that of lead cable. Thus, the transmission and the reflection of traveling wave complexly occur at this connection point. According to these influences, voltage between sheath and earth as well as voltage between joint boxes rise. Time to crest point of switching overvoltage is longer than lightning overvoltage. Even though the voltage induced by switching surge is smaller than lightning surge, that voltage may have serious effect on the metal sheath. Therefore, this paper also analyses the reduction effect of switching overvoltage when the preinsertion resistance of circuit breaker is considered.
Keywords
Switching surge; Underground transmission cable; Overvoltage; Preinsertion resistance; Circuit breaker;
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