Research on the mechanical state detection technology of high voltage isolation switch based on torque and angle

The isolation switch in Gas insulated Switchgear (hereinafter referred to as GIS) serves as the critical power equipment within the power grid system; however, an effective method for detecting the mechanical state of the isolation switch is hitherto lacking. Hence, this paper investigates the detection approach for the mechanical state of the GIS isolation switch. This paper focuses on the research of a model 252 kV GIS isolation switch, simulating typical mechanical faults such as rust sticking, closing not in place, and three-phase inconsistency. The study utilizes a wireless automatic torque wrench detection system to collect torque-angle data during the opening and closing process under various simulated mechanical conditions. Key feature information such as mean torque of stationary section, peak torque of rigid minute/junction point, and Angle of overrun torque in the torque-angle curve are extracted for analysis of the characteristic laws of operating torque and rotation angle under different mechanical states. Finally, a mechanical state detection method for GIS isolation switches based on characteristic parameters of torque and angle is proposed to provide reasonable suggestions for the operation and maintenance of isolation switchgear.