Fault Analysis of a Gas Circuit Breaker in the 154kV Power Line

154kV 전력계통 가스차단기 고장 분석

This paper describes fault analysis of a $SF_6$ gas circuit breaker of a transformer in a hydro power plant which is connected to the 154kV line. The fault is a single-line-to-ground fault, so that it gives power generation halt and economical loss. The analysis has been done in aspects of the status of the breaker, insulation degradation, surge invasion and earthing resistance of the switchyard.