4회선 인입철구 구조를 가진 154 kV 변전소의 뇌과전압 해석

Lightning Surge Analysis in 154 kV S/S due to Flashover on the 4 Circuits Tower

This paper describes the analysis results for the protection of lightning surge at 154 kV substation. We found that the surge arrester is needed at the inlet structure. The maximum overvoltage is about 1,500 kV at the circuit breaker without the surge arrester at the inlet structure. This value can be lower than 600 kV by installing the surge arrestor at the inlet structure. In addition to the incoming surge from transmission line, the shield wire should be considered to prevent the shielding failure by the direct lightning stroke.