Week 3

Question 1

What is the steel used for in line conductors?

Answer 1

Strength

Question 2

Why do companies “bundle” conductors in transmission?

Answer 2

To increase amperage capacity and reduce corona loss

Question 3

What do transmission lines use for lightning protection?

Answer 3

Shield wires

Question 4

What is the “right of way” when speaking of transmission lines?

Answer 4

It’s the land easement that allows power companies to access, construct, and maintain power lines, including the clearing of vegetation.

Question 5

Which type of transmission structures are ideal for lines operating at 345kV and below?

Answer 5

Wood pole structures

Question 6

Which of the following voltages are considered “main grid”?

a. 138kV b. 69kV c. 115kV d. 230kV

Answer 6

d. 230kV

Question 7

What is an “LTC”?

Answer 7

Load Tap Changer: It allows the power transformer to adjust voltage to changing conditions.

Question 8

Which part of the substation covers the entire footprint of the station, and slightly outside the fence?

Answer 8

The ground grid

Question 9

What are the three functions of a substation?

Answer 9

Change the voltage of circuits from one level to another
Connect or disconnect lines or equipment from each other
Control the flow of power by adjusting the voltage and current

Question 10

A substation changes the voltage from 345kV to 69kV. Which type of substation is this?

Answer 10

Subtransmission