Due to the simple structure and low cost of the porcelain column high-voltage disconnectors

people often pay little attention to its debugging and maintenance

which leads to frequent faults of the disconnectors.Among them

there is still a lack of effective detection methods for mechanical faults.In this paper

taking the horizontal folding arm disconnector as the research object

the non-implantable torque detection system is used to measure the operating torque-angle curve during the opening and closing process.Meantime

the changing trend of the curve and the corresponding movement process are analyzed in detail.The experiments of various simulated mechanical faults are designed.According to the comparison results of the fault curve and the standard curve

the area ratio of closing and opening of the disconnector is less than 1 when the balance spring fails.The torque under jamming state is obviously bigger.When the action is not in place

the spindle rotating angle is smaller.On the basis of this

the diagnosis method of the mechanic al state of this type of disconnector based on torque-angle curve and the corresponding maintenance strategy are put forward

which provides a reference for the maintenance operation of this type of disconnector.