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Simulation Study on the Vibration Characteristics and Vibration Fault Propagation of Insulated Metal-Enclosed Switchgear (GIS) Busbar

The existing methods of fault detection for Gas- Insulated metal-enclosed Switchgear (GIS) are mainly aimed at the discharge faults of GIS, and the related detection techniques for the abnormal noise and vibration of the GIS equipment are less reported. Therefore, the study of the vibration characteristics caused by the mechanical anomalies in the GIS equipment becomes particularly urgent. Based on the specific size of GIS equipment, the vibration characteristic simulation model of GIS busbar was constructed, and the vibration characteristics of the GIS equipment were simulated and analyzed. The simulation results show that there are five natural vibration frequencies of 416.62 Hz, 475.66 Hz, 504.77 Hz, 888.29 Hz and 1030.9 Hz near the natural frequency of 100 HZ. The vibration characteristics of the GIS equipment have low frequency characteristics. When the length of GIS shell is longer, the lowest natural vibration frequency tends to be lower; and when the GIS shell length is longer, the lowest natural vibration frequency is higher. When the insulator of the basin is loose, the vibration signal of the connection between the basin edge and the GIS shell is the strongest. The location of the sensor should be close to the connection between the basin insulator and the shell.