为优化户外气体绝缘开关设备（gas insulated switchgear, GIS)变电站的布置，采用了气体绝缘母线（gas insulated line, GIL)连接主变和GIS设备。通过技术、经济比较，此方案能节省变电站占地和投资，并能提高连接的可靠性，促进两型一化智能变电站的建设。同时，从出厂、交接、预防性试验及检修等角度分析了应用GIL连接带来的问题，提出相应的建议方案。

The application of gas-insulated line (GIL) connection was analyzed through techno-economic comparison, for the layout optimization of outdoor gas-insulated switchgear (GIS) substation. The result shows that this method has some advantages, such as economic in investment, little in occupy floor, reliable in connection, and it can promote the “resource conserving, environmental friendly and industrialized” substation construction. This paper put forward some proposals for the application of GIL connection, based on the deep analysis on the problems of using GIL connection during factory, handover preventive testing or maintenance.