Multi-Method Collaborative GIS Fault Defect Diagnosis Research

Based on the advantages and disadvantages of the UHF method and ultrasonic method in partial discharge(PD) online detection and location technology for Gas Insulated Switchgear (GIS), this study proposes a local discharge location method using a combined acousto-electric approach. An optical fiber EFPI sensor is employed for the ultrasonic sensor to enhance detection sensitivity. Experimental research was conducted by introducing simulated defects into a section of GIS busbar. The results indicate that this method simultaneously detects the ultrahigh-frequency and ultrasonic signals of PD, compares and verifies the two signals, accurately locates insulation defects, improves the efficiency of high-voltage electrical equipment maintenance, and ensures the secure operation of the power grid.