As the domestic economy develops, the national power grid and substation development requiresextremely high demand for the types and quantity of the high voltage apparatus. Currently the252kV GIS can be divided into two types: GIS and AIS. GIS requires much smaller occupied landand high reliability. Comparatively speaking, the AIS is much cheaper in terms of cost butoccupying much more land. Therefore, many customers need an inter-mediate type combining bothadvantages of GIS and AIS. This is the reason why the ZHW-252 HGIS was developed.

The HGIS consists of CB, DS, ES, FES, CT and gas bushing, can be used together with AIS, requiring smaller land but higher reliability and suitable cost.

1、High reliability

High reliability can be ensured based on the conventional 252kV GIS, which requires less site work and fulfilling the switchyard requirement.

2、More usability

Proven standard modular design, which has advantages such as simple structure, less installation work and cost etc.

3、Economically

Cost for HGIS is around 80% of that of the GIS and 60% of AIS, which is more economical.