243 / 2022-03-14 21:32:49

Application of UHF and HFCT partial discharge detection in GIS cable terminal defect

Cable terminal,Partial discharge,Ultra high frequency,High frequency current,Dry and hard of silicone oil

Abstract: Power cable is widely used in urban power grid, which safe and stable operation is of great significance to reliable power supply. By means of UHF and other live detection methods, the cable faults can be detected in time , avoiding equipment damage and power failure. In this paper, a partial discharge defect of GIS cable terminal was found by UHF and HFCT methods. The location of discharge power was determined by amplitude location and time difference location. The defect type was diagnosed by long time accumulative PRPD. The disassembly result shows that there is discharge trace on the surface of epoxy resin, there are yellow liquid drop and impurities on the terminal, and there are white mark and powder after dry and hard of silicone oil. The disassembly result verifies the validity of online detection method and provides reference for preventing similar defects.