SDG's

Question 1

What is the starting sequence of the SDG’s

Answer 1

The Powerlyx sees under voltage on 69kv EP bus. It starts a 150 second timer then it opens the MDS. Once the MDS is open a start signal is sent to both SDG’s. The first SDG to reach speed and voltage closes its output breaker to the dead bus. The second SDG Auto synchronizes to the bus and closes its output breaker. Then the tie breaker closes.

Question 2

What would you power if you only had one SDG?

Answer 2

1 CCW pump.
1 ESW pump.
1 NESW pump.
1 CCP.
And a control air compressor.

Question 3

What are the SDG’s used for?

Answer 3

To power one train in one unit.

Question 4

What is the primary purpose of the SDG’s?

Answer 4

Provide a source of power to power equipment needed for RCS inventory control.

Question 5

Are the SDG’s safety related?

Answer 5

NO

Question 6

What do the SDG’s use 48vdc for?

Answer 6

Breaker control power

Question 7

What do the SDG’s use 24vdc power for?

Answer 7

Indication lights

Question 8

Where is the MDS located in the power flow path?

Answer 8

Down stream of the EP transformer.

Question 9

What will open the MDS?

Answer 9

Low voltage on EP.

Question 10

What do you have to do if you want to operate an SDG breaker in test?

Answer 10

You have to in gage the aux contacts