Start Stop

Question 1

Steps to be taken and observations made to initiate start sequence

Answer 1

Operator records head and tail water on form 84a
Ensure gen dc pilot light for dc protective relays is on
Run gate limit to 25%
Place 1cs in the start position observe green light go out and red turns on
Observe FWS operation from indicator lights.
Wait for auxiliaries to time out and gen to roll

Question 2

Contacts of 1cs1

Answer 2

Momentary contact that is only closed when held in the start position
A slip contact closed only in start and after start
A TAT contact that is closed in the stop and after stop.

Question 3

What type of relays are the 4g1
4g1x
63x1a
63x1b

Answer 3

Westinghouse mg6 clapper relay- 4g1 4g1x
Non retentive time delay closing relay- 63x1a
Westinghouse sg relay- 63x1b

Question 4

4g1 closes contacts to?

Answer 4

Start the dc turbine oil pump (6qdc1)
Start the ac turbine oil pump
Start generator cooling water
Closes a contact in the generator auxiliary run timer circuit
Closes a contact to seal itself in
Closes a contact to energize 4g1x2 relay.

Question 5

What determines when and which generator is started as required?

Answer 5

TVA load schedule determines the time in order to meet load demand.
Once time is determined operator checks form 103b for available generator with lowest month previous hours and starts it.