Comparative Analysis of Partial Discharge and Mechanical Vibration Characteristics under Loose Bus Base with Foreign Body Defect of GIS

Abstract

The mechanical defect of GIS equipment is important factor that endangers the safe and stable operation of GIS equipment. In order to explore the partial discharge and vibration signal characteristics of GIS equipment under mechanical defects, this paper carried out the setting of loose bus base with foreign body defect based on the 550 kV GIS mechanical defect simulation platform. Partial discharge and mechanical vibration signal detection were carried out. The discharge and vibration characteristics of mechanical defect under different voltages and currents were compared and analyzed, and the mechanism was explained. The results show that, the loose bus base with foreign body defect of GIS can cause partial discharge and abnormal mechanical vibration. The amplitude of discharge signal increases with the increase of voltage and presents the characteristics of free particle discharge. The vibration signal is mainly composed of 100Hz frequency components, and the 100Hz amplitude will increase with the increase of voltage and current. The vibration signal contains 1000–1300 Hz harmonic component, but there is no discharge vibration characteristic. The conclusion of this paper can provide reference for multi-parameter joint fault detection of operating GIS equipment.