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.

Click For Next Item: Gas Insulated Substation

OR

Choose another major equipment

OR

Attempt the quiz

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

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?

Current transformer

Power transformer

Ideal transformer

Voltage transformer

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

Temporary overvoltage

Switching surge

Phase-to-ground short-circuit

Lightning strike

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

Circuit switcher

Either a breaker or a circuit switcher

Circuit breaker

Disconnect switch

What’s the purpose of a conventional power transformer?

Transform voltage and current

Transform power, voltage, and current

Transform voltage only

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 current limiting fuses in series on the switchgear

Buy new transformer with higher impedance (%Z)

Add inductor in the transformer neutral

An industrial facility is plagued with voltage flicker and poor power factor at the service entrance. Which device would you install to fix both issues?

Install capacitor bank

Voltage regulator

Harmonic filter bank

Your score is

The average score is 41%