Electrical Transmission Lines

Question 1

In long transmission lines the incident component of voltage increases in magnitude and phase as we ____ the receiving end

Answer 1

move away from

Question 2

A 3.3KV/0.4KV transformer is installed on a?

Answer 2

Secondary disribution system

Question 3

What kind of clearance is required around fast growing trees?

Answer 3

12’ of side clearance, 10’ of overhanging clearance and 14’ of clearance underneath the distribution line

Question 4

What kind of clearance is required around slow growing trees?

Answer 4

8 ‘ side, 10’ overhanging and 10’ underneath

Question 5

What are the voltage ratings according to ANSI C84.1?

Answer 5

Medium Voltage: 600 - 69,000 volts
High Voltage: 69,000 - 230,000 volts
Extra High Voltage (EHV): 230,000 - 1 million volts
Ultra-high Voltage (UHV): 1 million or more volts

Question 6

Distribution main feeders or primary circuits operate at voltages between 2400 and _____?

Answer 6

34,500 volts

Question 7

Transmission Circuit

Answer 7

A set of conductors energized at voltages over 69,000 volts and transmitting over large blocks of electrical energy over long distances

Question 8

Substation

Answer 8

High voltage electric system facility used to switch generators, equipment, and circuits or lines in and out of the system, change ac voltages and change current type.

Question 9

Distributions Substation

Answer 9

Are located near the utilization point - transformers change the voltage to lower levels and circuits extend over shorter distances to customer’s premises.