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

Insulator
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.

Insulators
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.

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For which event should a surge arrester operate? Check all that apply.
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