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

  • 345kV and above: ~$5,000
  • 138kV insulator: ~$500

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.


Choose another major equipment


Attempt the quiz

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

Substation Major Equipment

It’s only stupid-simple, let’s begin.

Which combination of devices would you use to implement power line carrier?
Question Image
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?
Question Image
What’s the purpose of a conventional power transformer?
Question Image
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?
Question Image
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?
Question Image
For which event should a surge arrester operate? Check all that apply.
Question Image
A transformer develops an internal fault. Which device would you install on the transformer high-side to interrupt fault current?
Question Image

Your score is

The average score is 41%

Leave a Reply

This site uses Akismet to reduce spam. Learn how your comment data is processed.

Scroll to Top