Real On-Site Partial Discharge Measurement Technique in Medium Voltage Power Cable

Abstract

This paper presents the measurement and detection techniques of partial discharge (PD) on medium voltage power cable with the idea to propose simplest and accurate online on-site PD measurement. The Rogowski Coil (RC) has been choose as measuring sensor to detect and measure PD signal at site. A real 11kV site at northern Malaysia substation was selected to perform the measurement with considering current PD measurement technique by utility. The propose method is used to locate the PD signal in three phase MV underground cross-link polyethylene (XLPE) cable with 240 mm2 size and 3 km length between two substations. On-site measurement has been carried out to verify the ability of method to detect PD signal and compare with previous method by utility. The analysis of PD signal using FFT was performed to characterize the actual PD signal. In this paper, results indicate that the measurement technique performed better and easier in detecting PD signal for online condition.