The conductive pipes of GW16 and GW17 disconnectors have a problem of water seeping-in

which results in corrosion of inner elements and harms safe operation of the disconnectors. However

there is no good method to effectively solve this problem at present. In this study

the main causes of water seeping-in

the current waterproofing measures and the corresponding problems were analyzed

and a new waterproofing method was presented for the disconnectors

including modification of local structures of the moving contact and rain cover

and application of heat-shrinkable material technology. Strict test demonstrated the effectiveness of the present waterproofing method.