关键词: 全封闭组合电器（GIS）, 高海拔, 沙漠化地区, 盐渍土, 750 kV, 超长尺寸

Abstract: There is no corresponding technical data and standards to guide constructions of gas insulated switchgears(GISs) with super-long size and 750 kV voltage in high altitude areas with desertificated and saline soil. An introduction of this kind of GIS assembly practices in a 750 kV power transmission project is presented. Considering sandstorm weather as well as salt particles in air, many measures were used, such as dust-preventing covers for equipment, clearing elements and blowing-off dust on workers who are going into the resembling room. An integrated schedule for equipment delivery, installation and tests in field was designed and implemented for the quality control of GIS installation in conditions mentioned above, by which the safety and reliable operation of GISs can be ensured. This research and practice can be references for similar projects.

Key words: gas insulated switchgear (GIS), high altitude, desertificated land, saline soil, 750 kV, super-long size