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

By Aleen Mohammed / August 10, 2019 September 16, 2021 / 1 minute of reading

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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Power Transformer

Circuit Breaker — Power Transformer

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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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Voltage regulator

Install capacitor bank

Harmonic filter bank

Which combination of devices would you use to implement power line carrier?

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Wave trap and line tuner

Wavetrap, capacitor coupled voltage transformer, and line tuner

Wave trap, capacitor voltage transformer and line tuner

What's the purpose of a conventional power transformer?

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Transform voltage and current

Transform voltage only

Transform power, voltage, and current

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

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Either a breaker or a circuit switcher

Circuit breaker

Circuit switcher

Disconnect switch

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

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Temporary overvoltage

Lightning strike

Phase-to-ground short-circuit

Switching surge

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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Add series inductors

Buy new transformer with higher impedance (%Z)

Add inductor in the transformer neutral

Add current limiting fuses in series on the switchgear

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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Power transformer

Current transformer

Voltage transformer

Ideal transformer

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