Main And Auxiliary Transformers

Question 1

What is the output breakers for U1?

Answer 1

Oscar and

Oscar1

Question 2

What feeds transformer 4?

Answer 2

765kv and 345kv

Question 3

What feeds transformer 5?

Answer 3

345kv

Question 4

What is the normal and backup power supplies to the unit aux transformer cooling?

Answer 4

Normal is TCSN.

there is no backup.

Question 5

What is the power supplies to the main transformer cooling?

Answer 5

TCSN, TCSE.

Question 6

What is the power supplies to the Reserve Auxiliary Transformer cooling?

Answer 6

Normal TCSE.

Backup off site power from 34.5kv.

Question 7

Describe U2 main transformer cooling group operation, both normal and backup.

Answer 7

The cooling group selected will run continuously, and the other group will cycle on temperature 75*.
When normal power supply is lost it will automatically switch to the alternate power supply and start the fans after a 20 second delay.
If selected to manual both groups will run continuously.

Question 8

Describe U1 main transformer cooling group operation, both normal and backup.

Answer 8

The cooling group selected will run continuously, and the other group will cycle on temperature 70.
When normal power supply is lost it will automatically switch to the alternate power supply and start the fans after a 20 second delay when temperatures rises to 75.
If selected to manual both groups will run continuously.

Question 9

What temperature does the unit aux transformer cooling fans come on?

Answer 9

Normal 70*

Backup 75*