The working environment of high voltage disconnector is relatively harsh

which often leads to various faults and problems and brings huge safety hazards to the operation of power grid. For improving the maintenance quality of high voltage disconnector

a high voltage disconnector defect analysis simulation based on the spindle torque-rotation angle characteristics is proposed. The simulation platform is set up and the non-implantable spindle torque-rotation angle detection system is used to measure the spindle torque-rotation angle characteristic curve during the opening and closing process and analyze the movement characteristics of the high voltage disconnector. The simulation results prove that the correlation coefficient of the closing section is 0.81 in accordance with the spindle torque-angle characteristic curve in the jam state

which proves that the high voltage disconnector is far from the normal state

and can directly reflect the jamming defect. In case of the fatigue state of the balance spring it is know through the spindle torque-angle characteristic curve that the closing area is lower than the opening area

and the correlation coefficient of the closing section is much lower than the normal value

indicating that the balance spring is in a fatigue state. The method in this paper has certain application value.