Main Power (Sro Cert)

Front 1

Main power purpose

Back 1

The main power system distributes the electrical output from the main generator to the AC electrical distribution system and the pennsylvania-new jersey-maryland (PJM) power grid.

Hint 1

obj 1

Front 2

Main power transformers purpose

Back 2

Step up main generator output voltage from 25kV to 500kV for application to the 500kV switchyard.

Hint 2

obj 2a

Front 3

Main generator disconnect (52x60) purpose

Back 3

Provides isolation capability for the main generator and main power transformers from the 500kV switchyard, allowing the 500kV switchyard to remain in a ring configuration.

Hint 3

obj 2b

Front 4

Identify the purpose of the SF6 high pressure gas

Back 4

The high pressure SF6 gas, stored in a gas receiver, is used for arc quenching during breaker opening operations.

Low pressure cutout (high pressure system) 240 psig @ 70°F Opens breaker closing control circuit and trips the breaker if the breaker is closed. This ensures the breaker is opened while there is sufficient high pressure SF6 gas for arc suppression and quenching.

Hint 4

objective 4a

Front 5

Identify the purpose of the 500kV switchyard and breakers

Back 5

The purpose of the 500KV circuit breakers is to provide fault isolation of a transmission line without interrupting power to the operable lines.

Hint 5

Objective 2c

Front 6

From memory summarize/identify the interlocks associated with the Main Power System that are required to enable turning gear operation

Back 6

Both Generator Output Breakers (500Kv Bus BS6-5 and BS2-6) are open. OR #1 Generator Main Trans 500Kv Disconnect (52X60) is open AND DC Control Power for the Disconnect Motor is available.

Hint 6

objective 13

Front 7

State the purpose of the station power transformers

Back 7

The purpose of the station power transformers is to supply power from the 500KV switchyard to the 13.8KV ring bus for station

Hint 7

objective 2g

Front 8

State the purpose of the 13kV disconnect switches

Back 8

The purpose of the disconnect switches is to provide a mechanism to isolate sections of the 13.8KV ring bus for maintenance

Hint 8

obj 2d

Front 9

Summarize / explain the interlock associated with 1T30, 3T30, and 13T30 (2T30, 4T30, and 24T30)

Back 9

Disconnects 4T30, 2T30 and 24T30 are interlocked such that only two of the three disconnects can be closed at one time. This interlock prevents paralleling the station power transformers through the 13.8KV switchgear. Disconnects 1T30, 3T30 and 13T30 are interlocked in a similar manner. All 13.8KV disconnect switches are mechanically interlocked with their associated ground switches. The ground switch cannot be closed until the disconnect is open and/or the disconnect cannot be closed until the ground switch is open.

Hint 9

Objective 10

Front 10

State the purpose of the 13.8kV ring bus

Back 10

Purpose - the 13.8KV ring bus provides the electrical tie between the 500KV switchyard and the station AC electrical distribution system.

Hint 10

Objective 2e.

Front 11

State the purpose and voltages of the station light and power transformers

Back 11

#1/2 SLP are 13.8kv/208/110v - switchyard utility use.

#3/4 SLP 13.8/13.8. - 13.8KV supplies power to the island substation ring bus

Hint 11

objective 2h / 2i / 7

Front 12

Identify three major automatic actions which will occur if a generator or unit lockout is initiated (exclude alarm)

Back 12

1. Trips and blocks closing of generator output breaker BS6-5 and BS2-6
2. Initiates breaker failure protection for BS6-5 and BS2-6. 3. Trips the Main turbine.

Hint 12

Objective 19

Front 13

Summarize the immediate action required by HC.OP-AB.ZZ-0135

Back 13

IF the EDG fails to start automatically, THEN START AND LOAD as necessary

Hint 13

objective 22

Front 14

Name the 13.8 kV yard interlock associated with the breaker lineup.

Back 14

An operator can't close bkr 2-3 without either 1-2 or 4-5 open first (same interlock exists between 7-8 and 6-7 & 9-0)

Front 15

How many bus sections are on the 500 kV ring bus?

Back 15

6

#1 Bus section 10

#2 Salem - 5037 and bus section 10

#3 Red Lion - 5015

#5 New Freedom - 5023

#6 Main Generator

Front 16

What is the bus section are on the 13.8 kV ring bus?

Back 16

10

#1 Station transformer T1

#2 BX501 (1E) / 502 / 503

#3 SLP1 - 500 kV switchyard

#4 CX501 and SLP3 (island ring bus)

#5 Station transformer T2

#6 Station transformer T4

#7 AX501 (1E) / 502 / 503

#8 SLP2 - 500 kV switchyard

#9 DX501 and SLP4

#10 Station transformer T3

Front 17

What interlocks associated with the main power system?

Back 17

Mnemonic - The Grumpy Little Policeman Denied Parole To 3 Lovely Blow Pushers
Turning Gear, Low Pressure, Disconnect Parallel, 3 lockouts (SPT/Unit/Generator), Breaker Parallel