Abstract: Abstract: High voltage disconnector is an important component of power system, which has advantages that other electrical equipment does not have and plays an irreplaceable role.High voltage disconnector ensures the security and stability of power system to a great extent.Based on the function of high-voltage disconnector in power system, this paper analyzes the common faults of high-voltage disconnector, and puts forward some suggestions for its future development.The performance of high voltage disconnector is affected by many factors. It is of great significance for reliable operation of power system to solve the problem from the root and improve the performance of equipment.