Design and Interface of GIS for Augmenting Capacity of Existing AIS in Highly Urbanized Area

Abstract

Due to increase in power demand, load on substation is increased day by day. In urban substation many a time it is not possible to provide extension to existing air insulated substation due to non availability of space to accommodate additional bays. In such case GIS extension is the only viable solution. In GIS extension the cables are drawn from the existing bus and they are connected to GIS equipment. There after depending upon the requirement, the GIS equipment is either connected to step down transformer or step up transformer and feeders are taken out for connection to grid. The extension of GIS from existing AIS substation need much engineering and also requires background of the equipment available in the market. Control and protection system of such expansion of GIS need critical review. Similarly operational configurations of GIS extension is different than those of independent AIS and GIS substation / switchgear also the Civil and structural work of such substation is a precise job. The project work examines various aspects of such GIS extension for given voltage class and brings out detail engineering and construction feature of such substation. The study will include equipment specification, retrofitting in the existing AIS (if it is an extension) and interface between AIS and GIS.