170㎸ 가스절연 개폐장치의 뇌과전압 해석

This paper presents lightning overvoltage analysis results of 170㎸ switch gear in gas insulated substation. The overvoltage is originated from lightning stroke to transmission line interconnected. To calculate the overvoltage in transmission line and substation, EMTP model which include distributed transmission line model of BUS, circuit breaker was built.