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2. RO32 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
What does TS 3.8.3 State?
- If FOST level is between 39,500 gal and 46,000gal of fuel oil restore volume to within limits
26
What does TS SR 3.8.1.6 have you verify?
- That each air receiver is ≥ 190#
27
What will happen on a loss of ctrl air to the TCC?
- It extends
28
What does TS 3.8.1 Require?
- 2 EDGs operable M 1-4 & opposite 1 EDG from opposite unit to support ESW
29
How is ctrl air designed to fail on a loss of 250V DC?
- Valves will fail in a position such that a control air pathway will be available to the TCC
30
What is the EDG auto trip with a loss of 250V DC?
- Mechanical Overspeed
31
What supplies power to the EDG 1Kv inverter
- 250V DC Battery Charger/Battery
32
Will a loss of 250v DC cause the EDG to be in operable?
- Yes, A loss of power will render the EDG inoperable, it can not auto start and load.
33
If you lose normal power to the HVAC supply or exhaust fan, what does it swap to?
- The EDG will power it
34
IF the EDG output Bkr is in closed or Lockout position, what does it defeat?
- Defeats Load Shed
35
What loads sequence on during a load shed w/out an SI?
CCW pump ESW pump MDAFW pump NESW pump
36
What loads sequence on during a load shed w/an SI?
- 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
If you have a load shed without an SI, will your CCP auto restart?
No it won't, you will have to manually restart it
38
What does TCC do when the HEA trips?
Extends [Fuel Racks close]
39
Will loss of one Jacket Water pump cause the EDG to be inop?
No
40
What are the EDG stops (not trips)
``` 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
When are the Loadshed available lights on
When the EDG output breakers are open. | Will remain on if output breakers are in pull to lock.
42
If there's an SI then a blackout what happens to EDG loads
Loads will re-strip & sequence on
43
If there's a blackout then an SI what happens to EDG loads
ECCS loads will not strip. Load conservation loads will strip and any ECCS loads not already loaded will sequence on.
44
Does a loss of DC power cause the EDG to trip
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
On a loss of the 1kV inverter what happens to the speed transmitters and Woodward Governor
They are transferred to the EDG PT output AND EDG control fails to remote
46
When is speed droop mode in effect
While the EDG is being paralleled
47
What does it mean to be in speed droop mode
When the grid frequency drops the EDG throttles fuel to lower EDG speed (prevent the EDG from picking up ALL grid load)
48
Explain what happens on an incomplete start sequence
- 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
When is the turbocharger jet assist used and for how long
Rolled by starting air for 20 seconds ONLY on a fast start
50
Will loss of 1 fuel oil transfer pump cause the EDG to be inoperable
No
51
Will loss of HVAC cause the EDG to be inoperable
Yes

2. RO32 Systems (54 decks)

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