The manufacturing technology progress

design and manufacture of miscellaneous high voltage devices are more and more perfect and gradually formed their own complete quality control system nowadays.But problems in the connection between different equipment onsite appear continuously due to different manufacturers supply different main equipement.Common main equipment connected to GIS are power transformer（or reactor）

power cable and gas insulated lines（GIL） etc.This paper explains main points of direct connection mode and gives feasible measures.Direct connection docking part shall be set to detachable independent gas chamber

its interface size and supply division shall enough be communicated within different manufacturers or utilities.In this paper

the problems and solutions of direct connections of GIS to transformer

cable and GIL are analyzed such as connection size

installation space

mechanical stress and acceptance test.