Premium Membership ♕

Save 50% on all EEP Academy courses with Enterprise Membership Plan and study specialized LV/MV/HV technical articles & guides.

Home / Technical Articles / Ultra-high voltage (UHV) AC gas insulated switchgear (GIS) for 1000kV and above

UHV GIS structure

Ultra-high voltage (UHV) AC gas insulated switchgear (GIS) can correctly work only if all its internal components are properly assembled and the metal enclosure is filled with SF6 gas at the required density. That’s obligatory. As in the lower HV voltage levels, the density of filled SF6 gas in UHV switchgears depends on the required internal arc extinction and insulation performance.

Ultra-high voltage (UHV) AC gas insulated switchgear (GIS) for 1000kV and above
Ultra-high voltage (UHV) AC gas insulated switchgear (GIS) for 1000kV and above (on photo: Jingmen substation, China; credit: ABB)

Structurally, GIS mainly comprises the current-carrying part (or internal conductor), insulation structure, enclosure, operating mechanism, gas system, grounding system, auxiliary circuit, and components.

In GIS, some components have their own separate gas chambers and some components are connected together and share the same gas chamber. Different chambers may be filled with gas of different densities. The conductive parts inside the metal enclosure are supported on the latter using cast epoxy resin insulators and different chambers are connected electrically with metal fittings.

Premium Membership Required

This technical article/guide requires a Premium Membership. You can choose an annually based Plus, Pro, or Enterprise membership plan. Subscribe and enjoy studying specialized technical articles, online video courses, electrical engineering guides, and papers. With EEP’s premium membership, you get additional essence that enhances your knowledge and experience in low- medium- and high-voltage engineering fields.

Check out each plan’s benefits and choose the membership plan that works best for you or your organization.

Good To Know!Save 50% on all video courses by purchasing Enterprise plan.

Log In »Purchase »

Premium Membership

Get access to premium HV/MV/LV technical articles, electrical engineering guides, research studies and much more! It helps you to shape up your technical skills in your everyday life as an electrical engineer.
More Information

Edvard Csanyi

Electrical engineer, programmer and founder of EEP. Highly specialized for design of LV/MV switchgears and LV high power busbar trunking (<6300A) in power substations, commercial buildings and industry facilities. Professional in AutoCAD programming.

Leave a Comment

Tell us what you're thinking. We care about your opinion! Please keep in mind that comments are moderated and rel="nofollow" is in use. So, please do not use a spammy keyword or a domain as your name, or it will be deleted. Let's have a professional and meaningful conversation instead. Thanks for dropping by!

seventy one  −  67  =  

Learn How to Design Power Systems

Learn to design LV/MV/HV power systems through professional video courses. Lifetime access. Enjoy learning!

Subscribe to Weekly Newsletter

Subscribe to our Weekly Digest newsletter and receive free updates on new technical articles, video courses and guides (PDF).
EEP Academy Courses - A hand crafted cutting-edge electrical engineering knowledge