Application of Pre-Shutdown AC Voltage Test System for XLPE Power Cable

초록

: This paper describes AC test for long delivered drum length of cable using pre-breakdown partial discharge detection method, which can be applied to observe the causes of electrical breakdown of EHV XLPE insulation. This method is to de-energize applied voltage to cable rapidly using pre-breakdown partial discharge, and is able to prevent complete breakdown. As this effect, defects such as voids, metal particles and protrusion in cable can be observed clearly. AC resonant test set was used for PBD method. Localization of partial discharge was performed by time difference detection of the traveling wave. Accuracy of localization was 1% to the length of test cable. Through several experiments with XLPE cable, successful results of PBD method were obtained.