What is the cost of an insulator?

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

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

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

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

Substation Major Equipment

It’s only stupid-simple, let’s begin.

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

Switching surge

Phase-to-ground short-circuit

Temporary overvoltage

Lightning strike

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

Wave trap and line tuner

Wavetrap, capacitor coupled voltage transformer, and line tuner

Wave trap, capacitor voltage transformer and line tuner

An industrial facility is plagued with voltage flicker and poor power factor at the service entrance. What’s the remedy?

Install capacitor bank

Voltage regulator

Harmonic filter bank

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 check voltage magnitude and synchronization?

Ideal transformer

Power transformer

Voltage transformer

Current transformer

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

Buy new transformer with higher impedance (%Z)

Add current limiting fuses in series on the switchgear

Add inductor in the transformer neutral

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

Circuit breaker

Circuit switcher

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

Your score is

The average score is 38%