Study on the Partial Discharge Characteristics and Development Process in Use of the Multiple Discharge Patterns for the Typical Defects in Gas-Insulated Switchgear

This paper presents an experiment to study the partial discharge (PD) characteristics and development process of the physical models of general insulation defects in gas-insulated switchgear (GIS). Four types of typical artificial insulation defects are designed to imitate the insulation faults in an actual GIS. The experiment PD data are obtained from a 220-kV GIS equipment using ultrahigh-frequency (UHF) PD measurement. The PD data obtained by UHF detection are stored as phase-resolved pulse sequence (PRPS) data. Then, the multiple PD patterns, such as PRPS analysis pattern, phase-resolved PD pattern, and Δu pattern, can be calculated from the PRPS data sets. On the basis of the present experimental research, the multiple PD patterns can be used to classify different PD defects and evaluate the stage of PD development process comprehensively of each typical defect.