It is desirable that the busbars can continue operating without shutting down during GIS extension and withstand tests.In order to meet this requirement

a new structure has been developed in this paper.The structure has double isolating distance and a function of earthing the middle conductor connected between the double breaks effectively.The comparison between the proposed GIS structure and the conventional GIS structure with bus disconnector is made.Further

the shell manufacturing

mechanical movement patterns

the interior structure as well as the principle of contacting are involved as well.Lastly

the installation instruction of the new structure in the field is intr

oduced.The risk of ground faults caused by the breaks breakdown in the procession of the GIS extension and the commission withstand tests can be largely avoided with the new structure installed as the disconnector of a busbar.Besides

this structure can also evidently reduce the operational risk during the joint installation of GIS chambers and save the processing time of filling and releasing SF

6

gas

which aids to largely improve the working efficiency.