Insulator: Learn the Purpose, Cost, and Lead Time to Procure

Insulator – the tubular steel is at high voltage while the I-beam at the bottom is at ground potential.

Purpose of insulator

Insulators make sure the energized parts do not touch the ground. All substation equipment in contact with an energized line or bus employs an insulator.

Do you see all the insulators including the pantograph switch with its stack? Image credit: First Energy – Lorain County Substation.

Cost of insulator

  • 138kV nominal voltage insulator: ~$500 each
  • 230kV nominal voltage insulator: ~$650 each
  • 345kV nominal voltage insulator: ~$1000 each
  • 500kV nominal voltage insulator: ~$1800 each

Lead time to procure insulator

~8 weeks

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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Insulator: Learn the Purpose, Cost, and Lead Time to Procure 1

Substation Major Equipment

It's only stupid-simple, let's begin.

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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A transformer develops an internal fault. Which device would you install on the transformer high-side to interrupt fault current?
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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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