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

Table Of Contents

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.

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.

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

Wave trap, capacitor voltage transformer and line tuner

Wave trap and line tuner

Wavetrap, capacitor coupled voltage transformer, and line tuner

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

Circuit switcher

Circuit breaker

Disconnect switch

Either a breaker or a circuit switcher

What’s the purpose of a conventional power transformer?

Transform power, voltage, and current

Transform voltage only

Transform voltage and current

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?

Install capacitor bank

Harmonic filter bank

Voltage regulator

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

Switching surge

Lightning strike

Phase-to-ground short-circuit

Temporary overvoltage

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?

Add series inductors

Add inductor in the transformer neutral

Buy new transformer with higher impedance (%Z)

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?

Voltage transformer

Ideal transformer

Power transformer

Current transformer

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The average score is 41%

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