극초단파 부분방전 검출장치를 통한 가스절연개폐장치 유지보수 연구

Abstract

Gas insulated switchgear (GIS) was replaced with indoor, compact, and closed-terminal types in accordance with emphasis on maintenance, safety and facilitation. There is a drawback of the long duration in the accident-restoration caused by the impossibility of verification for the fault section within easy range of a technician in the existing GIS facility. Therefore, the partial discharge (PD) measurement techniques were used in the applied voltage state. In this study, the criterion point of PD detector for GIS was obtained by verifying the huge amount of data in the installed and operated systems under Korea Railroad corporation. The criterion point for the judgment on existence/absence of the PD occurrence in GIS was determined with realignment of criterion value through the reflection of the corresponding warning number by detecting pC and PPS values of the ultra high frequency sensor in abnormality and the adjacent sensor. As a result, the scientific and systematic judgment of criterion in the maintenance was secured not only to decrease in economic losses by use-suspension of the operating equipments but also to prevent the accidents by the PD in advance.