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1. Systems > EDGs > Flashcards

EDGs Flashcards

1
Q

What are the EDG Auto Starts?

A
  • Load Shed (Loads to Bus)

- SI (does not load to bus)

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2
Q

If an EDG auto starts on a Load Shed, does it load to the TBUS?

A

Yes, it loads to the TBUS

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3
Q

If an EDG auto starts on a SI without a load shed, does it load to the TBUS?

A

No it does not auto load to the TBUS

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4
Q

What are the EDG Auto Trips (With DC Power)?

A
  • Bearing Temp High* (195°F or 175@10°F/min
  • Incomplete Start
  • Gen Phase Overcurrent
  • CO2 Actuation
  • Fuel Oil Press Low* (10 psig)
  • Lube Oil Press Low * (25 psig)
  • Air Chest Press high (25 psig)
  • Neutral Overcurrent
  • Gen Phase Differential
  • Electronic Overspeed (110% 565 rpm)

*Enabled at 95% speed

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5
Q

What are the EDG Trips available Without DC Power?

A
  • Mechanical Overspeed

- Worthington/Manual Fuel Valve (MFV)

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6
Q

What are the only EDG TRIPS available after the EDG Auto Starts on an SI or Load Shed?
(With 250 VDC Available)

A
  • Gen Phase Differential
  • Electronic Overspeed (110%)
  • Manual Push Button
    (Control Switch HELD in Stop)
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7
Q

The starting Air Receivers are sized to do how many EDG starts?

A

Each tank has enough air to start the EDG 2 times and still have 100# for control air

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8
Q

What are the EDG Starts?

A
  • CR Control Switch
  • Local Push Button
  • Load Shed (loads to bus)*
  • SI (does not load to bus)*
  • Worthington/Manual Starting Air Valve (MSAV/Worthington) (allows start during loss of 250VDC control power)*
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9
Q

How do the starting air valves fail on a loss of 100# ctrl air?

A
  • Fail as is
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10
Q

What happens on a loss of the electronic governor?

A
  • EDG will speed up until Mechanical Governor takes over

* * Mechanical governor is the back up to Electronic governor, set point for mechanical governor is 61 Hz (523 RPM)

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11
Q

Where does the field flash come from on a fast speed start?

A
  • Field flash comes from 1kV inverter
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12
Q

Where does the field flash come from on a slow speed start?

A
  • Field flash comes from residual magnetism
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13
Q

At what percentage of rated speed does the field flash stop on a fast speed start?

A
  • 80% speed stops field flash during fast speed start
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14
Q

What are the 1KV inverter Loads?

A
  • Field Flash (Fast Start) (Slow Start if button is pushed)
  • Bearing Temp Monitor
  • Speed Transmitters
  • Local/Remote Control Transfer Relays
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15
Q

How long does the Throttle Control Cylinder (TCC) extend for on a EDG Trip and why?

A

TCC will extend for 2 minutes on trip to prevent re-start of EDG

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16
Q

Will a EDG start with a loss of 100# Ctrl Air?

A

No, because if 100 # (control air) system is lost, TCC extends on loss of air

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17
Q

How can a load shed signal be disabled?

A

-When the EDG output breaker control switch is in close (lights off) or lockout (lights won’t turn off)

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18
Q

When do run relays energize and what functions do they perform

A

Run relays energize at 95% running speed.

  • Start support equipment
  • Interlock for output breaker closure
  • Disable incomplete start circuit
  • De-energizes starting air valves SV-1 and SV-2
  • Input to load conservation circuit
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19
Q

What is disabled on a Slow Speed Start?

A
  • Jet Assist

- Field Flash

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20
Q

If an emergency start signal initiates at any time during the slow start, what will happen?

A
  • The slow start circuit automatically drops out and an emergency start takes place (Fast Speed)
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21
Q

Are the EDG trip relays energize or de-energize to trip?

A
  • Energize to Trip
22
Q

Are the EDG start relays energize or de-energize to run?

A
  • De-Energize to run

1/bus – want to run if lost power

23
Q

Is the EDG considered Inop during a surveillance?

A
  • EDG is INOP during testing because the Load Shed signal is deactivated
24
Q

When the TCC extends, what is it doing?

A
  • Forces the fuel racks closed
25
Q

What does TS 3.8.3 State?

A
  • If FOST level is between 39,500 gal and 46,000gal of fuel oil restore volume to within limits
26
Q

What does TS SR 3.8.1.6 have you verify?

A
  • That each air receiver is ≥ 190#
27
Q

What will happen on a loss of ctrl air to the TCC?

A
  • It extends
28
Q

What does TS 3.8.1 Require?

A
  • 2 EDGs operable M 1-4 & opposite 1 EDG from opposite unit to support ESW
29
Q

How is ctrl air designed to fail on a loss of 250V DC?

A
  • Valves will fail in a position such that a control air pathway will be available to the TCC
30
Q

What is the EDG auto trip with a loss of 250V DC?

A
  • Mechanical Overspeed
31
Q

What supplies power to the EDG 1Kv inverter

A
  • 250V DC Battery Charger/Battery
32
Q

Will a loss of 250v DC cause the EDG to be in operable?

A
  • Yes, A loss of power will render the EDG inoperable, it can not auto start and load.
33
Q

If you lose normal power to the HVAC supply or exhaust fan, what does it swap to?

A
  • The EDG will power it
34
Q

IF the EDG output Bkr is in closed or Lockout position, what does it defeat?

A
  • Defeats Load Shed
35
Q

What loads sequence on during a load shed w/out an SI?

A

CCW pump
ESW pump
MDAFW pump
NESW pump

36
Q

What loads sequence on during a load shed w/an SI?

A
  • CCP
  • SI pump
  • RHR pump
  • CCW pump
  • ESW pump
  • MDAFW pump
  • CTS pump (Starts when Phase B active)
  • NESW pump (Starts/Then Trips if CTS/ Phase B active)
37
Q

If you have a load shed without an SI, will your CCP auto restart?

A

No it won’t, you will have to manually restart it

38
Q

What does TCC do when the HEA trips?

A

Extends [Fuel Racks close]

39
Q

Will loss of one Jacket Water pump cause the EDG to be inop?

A

No

40
Q

What are the EDG stops (not trips)

A 
Control room switch
Local push button (HEA trip)
Control Room push button (HEA trip)
Manual Fuel Valve (only when DC is off)
Incomplete start
Diesel HEA trips
41
Q

When are the Loadshed available lights on

A

When the EDG output breakers are open.

Will remain on if output breakers are in pull to lock.

42
Q

If there’s an SI then a blackout what happens to EDG loads

A

Loads will re-strip & sequence on

43
Q

If there’s a blackout then an SI what happens to EDG loads

A

ECCS loads will not strip. Load conservation loads will strip and any ECCS loads not already loaded will sequence on.

44
Q

Does a loss of DC power cause the EDG to trip

A

If the EDG is already running it will not trip on a loss of DC power because SV-6 keeps air on the throttle control cylinder

45
Q

On a loss of the 1kV inverter what happens to the speed transmitters and Woodward Governor

A

They are transferred to the EDG PT output AND EDG control fails to remote

46
Q

When is speed droop mode in effect

A

While the EDG is being paralleled

47
Q

What does it mean to be in speed droop mode

A

When the grid frequency drops the EDG throttles fuel to lower EDG speed (prevent the EDG from picking up ALL grid load)

48
Q

Explain what happens on an incomplete start sequence

A
  • Stops giving air to EDG after 10 seconds if not at rated speed
  • Energizes the start relays
  • De-energizes the starting air valves
  • Extends the Throttle control cylinder for 2 mins
  • Seal-in circuit prevents start of EDG until reset from the control room
49
Q

When is the turbocharger jet assist used and for how long

A

Rolled by starting air for 20 seconds ONLY on a fast start

50
Q

Will loss of 1 fuel oil transfer pump cause the EDG to be inoperable

A

No

51
Q

Will loss of HVAC cause the EDG to be inoperable

A

Yes

1. Systems (56 decks)

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