Gas Insulated Substation: Learn the Purpose, Cost, and Lead Time to Procure

Gas insulated substation
GIS substation

Purpose of Gas Insulated Substation

Air has a dielectric strength of 33kV/cm. SF6 gas, on the other hand, has a dielectric strength of ~83kV/cm. Naturally, when the live parts are immersed in a pressurized gas chamber they can be placed a lot closer. Every piece of equipment (except the transformer or any other coil product) that makes up a substation can be neatly packed in an enclosed gear that is filled with SF6.

Cost of gas insulated substation

  • Single leg/bay of 138kV breaker and a half substation (not including protective relays – equipment only): ~$500,000.
  • 345kV gas-insulated bus only: ~$2,600 dollars per feet.

Lead time to procure gas insulated substation

~1 year

Information on cost and lead time is for your general knowledge only. Contact vendor with your equipment specifications for actual figures.

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Gas Insulated Substation: Learn the Purpose, Cost, and Lead Time to Procure 1

Substation Major Equipment

It’s only stupid-simple, let’s begin.

What’s the purpose of a conventional power transformer?
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A transformer develops an internal fault. Which device would you install on the transformer high-side to interrupt fault current?
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Which combination of devices would you use to implement power line carrier?
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You are building an interconnect station, tying wind farm generation to the power grid. At the substation, the sources are tied through a tie-breaker. Which device would you install to make sure the sources are synchronized?
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An industrial facility is plagued with voltage flicker (due to harmonics) and poor power factor at the service entrance. Which device would you install to fix both issues?
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For which event should a surge arrester operate? Check all that apply.
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In a distribution substation, the available ground-fault current on the low side of the step-down transformer is excessive, over-dutying the switching equipment. What is your cost-effective solution to reducing the fault current?
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Aleen Mohammed

Aleen Mohammed

Registered Professional Engineer | MSEE
Skillset: Substation Design | Power System Studies | Arc Flash Study
DISCLAIMER: ALL VIEWS EXPRESSED IN THIS ARTICLE ARE MINE ALONE.

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