Partial discharge monitoring system for PD characteristics of typical defects in GIS using UHF method

GIS is now widely used in power system because of its compact structure, easy maintenance, and reliable operation. It is necessary to detect partial discharge (PD) in GIS because partial discharge (PD) causes deterioration of insulation and losses of power system. UHF method has great advantages of high sensitivity, strong anti-interference ability, the ability of locating PD sources, and recognizing the defect type. In this, the partial discharge monitoring system for GIS Based on UHF Method is introduced including both the hardware and software systems. A PD detection and diagnosis test system for GIS is also established based on the monitoring system above. The PD characteristics of two typical defects in GIS are researched, and the Phase Resolved Partial Discharge (PRPD) spectrograms are drawn after dealing with the PD Pulse Sequence of typical defects models, by which the type of defect could be identified.