Gas Insulated Switchgear And Gis Substation Essentials

Gas insulated substation gis design.

Gas insulated switchgear and gis substation essentials.

The sf 6 gas which has high dielectric property acts as an insulating medium to the high. The metal enclosed gas insulated switchgear inherently follows the criteria for new substation design and offers a higher reliability and flexibility than other solutions. Gas insulated substations gis differ from air insulated substations substations we usually see such that all the substation equipment such as busbars circuit breakers current transformer potential transformers and other substation equipment are placed inside sf 6 modules filled with sf 6 gas. Gis there are two terms presented in iec gas insulated switchgear and ieee gas insulated substations in ieee c37 122 gas insulated switchgear gis.

Gas insulated switchgear and substations. Gas insulated substations gis use circuit breakers disconnect switches and grounding switches and have various means of indicating their position either opened or closed so the same as in ais. Gas insulated substations gis primarily use sulphur hexafluoride gas as the primary insulator. A gas insulated substation gis uses a superior dielectric gas sf6 at moderate pressure for phase tophase and phase to ground insulation the high voltage conductors circuit breaker interrupters switches current transformers and voltage transformers are in sf6 gas inside grounded metal enclosures.

Gas insulated switchgear and gis substations substation essentials course overview there is a continuous increase in the application of gas insulated switchgear gis into electric power transmission substations. With today s ever increasing land and civil cost for substations the ability to accommodate more and more. Gis substation simply put in the gis system all the live components are enclosed in a grounded metal enclosure then the whole system housed in a chamber full of gas. A compact multicomponent device enclosed in a grounded metallic case in which the basic insulating medium is sf6 gas.

Gis substations can therefore be smaller than conventional air insulated substations. The circuit breaker disconnectors and earth switches. Main components of a gas insulated substation gis you should know about. The course also addresses gis substation topics such as installation substation design insulation coordination grounding testing and condition monitoring.

Due to the gas enclosed design gis is the most suitable solution for indoor and underground substations. The higher the voltage the more applicable is the use of gis switchgear. The need for higher reliability more compactness and insensitivity to environmental factors are the key drivers for the evolution of sf6 gas insulated switchgear gis. The superior dielectric and arc quenching properties of the sf6 gas allow a substantial reduction in the size of the switchgear.

Gas insulated switchgear is the most modern form of high voltage switchgear.