Study on Amplitude Characteristics of Electromagnetic and Vibration Parameters for “Plug-in” Type High-Voltage Conductor Connection Structures in GIS

The “plug” type high-voltage conductor connection structures is extremely prone to parts loosening under frequent action, its connection reliability will be drastically reduced under continuous mechanical vibration, posing a great threat to the equipment safety. To study the overall vibration characteristics of the “plug-in” type conductor connection structures in gas insulated switchgear (GIS), this paper firstly proposed a finite element calculation procedure with “electromagnetic-mechanical” coupling by combining physical ontological relationship and elastic dynamics equations, and then established a finite element calculation model by taking 126 kV “plug-in” type disconnector chamber as the study object. Finally, the electromagnetic and vibration parameter amplitudes and their distribution characteristics of the “plug-in” type connecting structures were investigated and analyzed. Results show that the distribution of electromagnetic and vibration parameters is strongly correlated with the geometric structure, and the amplitude is the largest at the confluence of the internal conductor structure. The acceleration signal is more sensitive to the detection of vibration information compared with the displacement vibration signal. The distribution of the vibration amplitude is related to the size of the structural constraint stiffness and vibration attenuation characteristics. The results provide effective references for GIS vibration detection and maintenance.