정류기 부분방전신호 검출을 위한 SHF대역 전자파 센서의 성능평가

초록

DC power traction system utilizes rectifier in order to convert AC to DC. Currently, a research on preventive diagnosing facilities to detect rectifier fault in advance is in progress. It is efficient to detect partial discharge signals by electromagnetic wave detection in order to detect insulation fault of rectifier. Although VHF, UHF sensors were adopted to detect partial discharge of power facilities, due to characteristics of urban railway, excessive noise occurs in 500MHz ~ 1.5GHz UHF bandwidth. Consequently, in this paper, comparison and estimation for performance of SHF sensor which had devised to detect partial discharge signal of urban railway rectifier has conducted. In order to estimate performance of SHF sensor, we have compared the sensor with existing UHF sensor on sensitivity upon frequency bandwidth generated by pulse generator, and also we have verified performance of the SHF sensor by detection results of partial discharge signal from urban railway rectifier.