Electrical systems Y1 W2

Electricity is generated in the voltage range of

• 13.8kv to 24kv

• 44 kV to 138 kV

• 2 kV to 34.5 kV

• 12kv to 21kv

Transmission lines are energized in the voltage range of

• 44kv to 138kv

• 19.9kv to 34.5kv

• 230kv to 765kv

• 13.8kv to 24kv

Sub transmission lines are energized in the voltage range of

• 44kv to 138kv

• 230kv to 765kv

• 2kv to 34.5kv

• 13.8kv to 24kv

Distribution lines are energized in the voltage range of

• 44kv to 138kv

• 13.8kv to 24kv

• 2kv to 34.5kv

• 230kv to 765kv

DC transmission lines have _ conductors

• 4

• 2

• 3

• 1

Services are low-voltage lines that travel from ____ to _____

in an overhead system.

Secondaries are low-voltage lines that travel from ________ to ________

in an underground system.

Secondaries are low-voltage lines that travel from ____ to ____

in an overhead system.

What are the three major functions of a substation?

• Change the voltage of circuits from one level to

  another

• Control the flow of power by adjusting the voltage

  and current

• Connect or disconnect lines or equipment from each

  other

• Generate electricity

• To transmit large blocks of power over

  long distances with a minimum of loss

Services are low-voltage lines that travel from ________ to _____

in an underground system.