Purpose of insulator

Insulators make sure the energized parts do not touch the ground. In the picture, the tubular steel is at high voltage while the I-beam at the bottom is at ground potential. All substation equipment touching an energized line or bus employs an insulator.

Do you see all the insulators including the pantograph switch with its stack?

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.

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