LOT 201.30 Offsite Electrical Flashcards Preview

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Flashcards in LOT 201.30 Offsite Electrical Deck (12):
1

LOT 201.30 Offsite Electrical


Which switchyard lines are not allowed to be counted toward tech specs?

Blessing 44 Line
Limited capability to provide required voltage

138 KV Blessing Line
Lines run below other lines

HILLJE 64 Line
Lines run below other lines

HILLJE 44 Line
Lines run below other lines

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2

LOT 201.30 Offsite Electrical


What provides control power for the Main Generator Breaker?

TB 250VDC 1A


Note:
Control power for the 13.8 kV breakers will come from either 125VDC Bus 1A or 1B. (Non-Class 125VDC busses)

3

LOT 201.30 Offsite Electrical


What will happen in the switchyard if a fault occurs on the standby transformer?

Unit 1:
All North Side breakers will trip

Unit 2:
All South Side breakers will trip

4

LOT 201.30 Offsite Electrical


What powers the 138 kV Emergency Transformer?

138 kV Blessing Line


Steps down voltage from 138 kV to 13.8 kV.

Can supply 1 ESF bus in each plant.


Note:
CP010 houses handswitch controls for the Emergency Transformer motor operated disconnect and the 13.8 kV feeder breaker to bus 1(2)K. 

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5

LOT 201.30 Offsite Electrical


What voltages are present on each side of the standby transformers?

345 kV / 13.8 kV


Note:
CP010 houses handswitch controls for the 13.8 kV feeder breakers.

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6

LOT 201.30 Offsite Electrical


What voltages are present on each side of the UAT?

25 kV / 13.8 kV


Note:
CP010 houses handswitch controls for the 13.8 kV feeder breakers.

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7

LOT 201.30 Offsite Electrical


Which 13.8 kV switchgears are normally powered from the standby transformers while at power?

1G STBY Bus 

2G STBY Bus


Loss of North Bus starts SDG 12

Loss of South Bus starts SDG 22

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8

LOT 201.30 Offsite Electrical


What is the purpose of a shunt reactor?

Compensate for line capacitance which can cause an elevated voltage during light load conditions.

9

LOT 201.30 Offsite Electrical


Where are the Unit 1 and Unit 2 standby transfomers powered from?

Unit 1:
North Bus

Unit 2:
South Bus

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10

LOT 201.30 Offsite Electrical


Which switchyard breakers can be operated from the control room?

Unit 1:
Y510 / Y520

Unit 2:
Y590 / Y600


Isolates the Main Transformer from the switchyard.


Note:
Visual Indication on CP007 AND CP010. Operable from CP007 ONLY.

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11

LOT 201.30 Offsite Electrical


What voltages are present on each side of the Main Transformer?

25 kV / 345 kV


Note:
CP007 houses handswitch controls for the Main Generator Circuit Breaker and the applicable unit switchyard pneumatic circuit breakers. 

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12

LOT 201.30 Offsite Electrical


Procedurally, what is the current rating of the standby transformer windings?

1621 Amps / Winding


Equivalent to 2 Aux Busses and all 6 ESF busses fully loaded.