Search

Premium Membership

Study specialized electrical engineering articles, papers & video courses in low/high voltage areas. Get 50% OFF on all courses at the EEP Academy with the Enterprise Plan.

Home / Technical Articles / Main components of a Gas Insulated Substation (GIS) you should know about

GIS components

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 air-insulated substation (AIS).

Main components of a Gas Insulated Substation (GIS) you should know about
Main components of a Gas Insulated Substation (GIS) you should know about

Operation of a GIS uses most of the same principles as operating an air insulated substation (AIS) although the various active components are physically configured differently. The first obvious difference is that the blades of the disconnect switches and the grounding switches used in a GIS are surrounded by grounded metallic enclosures.

This enclosure prevents the blades from being readily and easily visible to determine their fully opened or fully closed position. The second obvious difference relates to the bus conductors being located inside grounded metallic enclosures.

These enclosures prevent the bus from being grounded with portable personnel grounds except at very discrete locations, such as air-to-gas bushing terminations at transmission lines and transformer banks.

Generally a GIS requires more extensive electrical interlocking between the circuit breakers, disconnect switches (isolators), and grounding switches. The specific detailed method of operating and interlocking is generally specified by the ultimate user of the GIS.

Contents:

  1. Circuit Breaker
  2. Disconnect Switches
  3. Nonfault-Initiating Grounding Switches
  4. High Speed (Fault-Initiating) Grounding Switches
  5. Three-Position Disconnect/Grounding Switches
    1. Voltage Transformers (VTs)
    2. Current Transformers (CTs)
  6. Switch Viewports
  7. Gas Compartments and Zones
  8. Interlocking
  9. Local Control Cabinets (LCCs)

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.

Note that an Enterprise subscription plan includes a 50% discount on all video courses and bundles at the EEP Academy.

Log In »Learn More »

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
author-pic

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!

three  ×  3  =  

EEP Academy Video Courses

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