COMPARATIVE ANALYSIS BETWEEN AIR INSULATED AND GAS INSULATED SUBSTATION - A REVIEW

This paper presents a comparative analysis of gas insulated substation and air insulated substation. A brief study of both the substations is carried out. As the electricity demand is increasing day by day, the power companies are giving their active participation in fulfilling the consumer demand. The design of power substation is classified as air insulated substation and gas insulated substation where the air and gas has a key role in providing insulation. An AIS unit is basically a conventional switchgear technology where air is used as a primary dielectric for insulation. Key property of AIS unit is step-up systems in connection with power stations and transformer substations in the extra high voltage transmission system. Whereas the gas insulated substation works on the principle operation of completely enclosure of all the energized parts in metallic encapsulation compressed within sulphur hexafluoride gas. Both the substations have equal merits and demerits in different aspects. Taking into account a comparative analysis is made regarding design aspects, power losses, cost and reliability