Statistical Analysis of Partial Discharge Faults of HV Cables

Abstract

High voltage XLPE cable has become the mainstream of power transmission equipment. At present, the application experience of cable condition diagnosis technology is insufficient, and there is still room for improvement in key issues such as technical limitations, application methods, detection cycle and evaluation criteria. Therefore, it is very important to get more accurate cable condition evaluation criteria by statistical analysis of cable faults. In this paper, the partial discharge fault of cable is analyzed. First of all, the guidelines and regulations of existing cables in China are studied, and the standards related to partial discharge and temperature in current cable condition evaluation are understood. Secondly, the typical cable fault cases are collected, the partial discharge data of the fault cable is recorded, and its distribution form is obtained. Finally, on the basis of the above research work, a calculation method of conditional fault probability of cable under given local discharge amplitude is proposed, which can reflect the severity of partial discharge fault of high voltage cable to a certain extent.