The GW16/17-550 outdoor HV disconnectors are widely used in the power grid.However

this type of disconnectors has such defects as contact overheating

movement block

and insufficient switch.Therefore

the internal structure of this type of disconnector is analyzed in this paper

some corresponding feasible measures are raised

and some disconnectors are subsequently modified successfully.Some suggestions about the design and manufacture of the disconnectors are as follows: ①narrowing the gap between the positioning bolt of the active contact and the matched hole;②adding insulation part on the operation lever in the conductive tube and replacing insulation wheels by stainless steel wheels;③ adopting non-welded structure and rustproof material

and adding an adjusting screw at the bottom of operation lever in the lower conductive tube;④applying sealant to the juncture of the upper and lower conductive tubes to prevent rain infiltration.The result shows that after transformation

the modified equipment runs well

and no recurrence of similar defects occurs.