The high voltage disconnector is widely applied to the substation

and their working conditions have great impacts on the safe operation of the substation. Over the years

the accident caused by disconnector mechanical failure has serious consequences. At present

for the mechanical defects such as the clamping stagnation of the conduct tube knuckle

failure of the balance spring

and uncompleted closing operation

the existing methods are mostly based on the preventive measures and the experience diagnosis

which are not complete. This paper proposes a method based on the corner signal of disconnector. In this paper

a GW6 type disconnector is used as the research object

the angle-time curve of three typical mechanical failure of the disconnector is measured and analyzed

and the disconnector mechanical failure diagnosis process based on the operating rod angle-time curve is established

which can provide guidance for the maintenance of the disconnector

discover the mechanical failure timely to prevent the accident from expanding.