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Diesel Generator Flashcards

1
Q

What will automatically start the DG?

A

Starts in emergency mode- LOP, SIAS, AFAS

Starts in Test mode- CSAS

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2
Q

When will a DG trip when its running in emergency?

A

Overspeed, Low Lube oil pressure, Generator differential

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3
Q

The DG starts, what else starts?

A

Spray Pond Pump, Pump house fan, DG blg HVAC

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4
Q

What are the conditions for the DG output breakers to close automatically?

A

LOP, DG @ rated speed and voltage, No faults on normal or ALT breaker, Normal and ALT breakers open.

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5
Q

What are the conditions for the DG output breakers to be closed from the CR?

A

DG @ rated speed and voltage, No fault on the norm or alt breakers, alt supply breaker open

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6
Q

What power is the DG designed to supply?

A
  1. 5 MW continously

6. 05 MW 2/24 hours

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7
Q

On a loss of spray pond, how long can you run the associated DG?

A

2.6 minutes loaded

15 minutes unloaded

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8
Q

In the manual control of the DG, what is the engine speed limited to?

A

580-630 rpm while in droop mode

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9
Q

If we are operating the DG in parallel with offsite power in the test run mode. What happens if we receive a SIAS or AFAS?

A

The DG output breaker, PBA-S03B will trip open

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10
Q

What is the minimum jacket water and lube oil system temperature to maintain the DG operable?

A

105 degrees F

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11
Q

When will we have to call the DG inoperable, regarding level in the fuel oil storage tank?

A
  • FOST level is less than 80% and greater then 71% for 48 hrs or more
  • FOST level is less then 71%
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12
Q

What cools the DG?

A

Spray Pond (JW, LO, FO, and intercooler)

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13
Q

What are the fuel oil storage tanks designed for?

A
  • 7 days of continuous operation at rated power plus a 15% margin for testing
    Administrative level is 85% to ensure we are above TS minimum
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14
Q

What are the fuel oil day tanks designed for?

A
  • 60 min of continuous operation at rated power plus a 10% margin
  • 1100 gallons
  • Min TS level 550 gallon (2.75ft)
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15
Q

When will the fuel oil transfer pump automatically fill the fuel oil day tank?

A

At 65% level

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16
Q

How much fuel does the DG use at full rated load?

A

6.4-7.0 GPM

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17
Q

What are the makeup sources for the JW system?

A

Norm- Demin
Backup- CST
Emer- Fire Protection

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18
Q

How many consecutive starts are the starting air receivers designed for?

A

5

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19
Q

The starting air control valves open on a start signal, when do they begin to close?

A

approx 280 rpm

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20
Q

At what temperature does the electric circulating pump and heater maintain the JW temperature at when the DG is not running?

A

120-135 degree’s F

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21
Q

When will the overspeed shutdown butterfly valve be tripped by the overspeed governor?

A

660 RPM

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22
Q

Physically how does the DG start?

A

Introducing high pressure air into the top of the power pistons turning the crankshaft and accelerating it

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23
Q

How does an AO emergency stop the DG?

A
  • Manual shutdown push button on local control panel
  • Main governor load limit control knob to min. position
  • Fuel manual control handle in off position
  • Manually trip overspeed butterfly valve
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24
Q

When the DG is in standby or shutdown; what position are the fuel racks in?

A

Minimum position

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25
Q

What pump is normally running to maintain it in a standby condition?

A

The electric circ pump and heater (maintain oil 120-135 degrees F)

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26
Q

What happens during the five minute cooldown?

A

Tests emergency run solenoids and pneumatic trip circuits

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27
Q

When a DG automatically starts; how long before the load sequencer automatically starts the DG blg HVAC?

A

25 seconds

28
Q

How long does the DG have to reach rated speed and voltage?

A

10 seconds

29
Q

How long after a class 4160 bus is energized will the load sequencer begin sequencing on loads if the sequencer has power?

A

60 seconds

30
Q

Where do you check the excitation relays are reset?

A

They are inside the DG control panel cabinet.

31
Q

Approximately how long after the diesel generator shuts down does the field flash relay reset. (meaning the light coming on).

32
Q

When you are going to press the first out/ system reset button on the DG control panel, what do you need to be aware of?

A
  • Make sure there are no active faults. If there is contact the control room before moving forward.
  • If the DG in in Emergency mode DO NOT push the reset button as the DG will automatically start.
33
Q

If the DG is in cooldown and it receives a start signal in test; what happens?

A

DG will trip on incomplete sequence

34
Q

When we are running a DG loaded; what is the minimum time it is recommended we run it?

A

four hours

35
Q

What is preferred power factor when running the DG?

A

1.0 lagging power factor

36
Q

To stop the DG locally, what position must the mode control switch be in? Stop from the CR position?

A

Locally it must be in local

CR must be in remote

37
Q

Describe the DG emergency stop sequence

A 
Run relays deenergize and run light off
Shutdown solenoid deenergizes
Generator breaker trip signal 
Engine stops with no cooldown
Warm-up pumps on
38
Q

If the DG is running and we lose class control power what happens?

A

DG trip. We lose the tripping capability of the output breakers. Must manually trip the output breaker to prevent motorizing the DG.

39
Q

If we lose non-class control power. What are the effects on a non-running DG?

A

Alarms and the CR couldn’t start the DG. The DG will still start in an emergency or via the emergency local push buttons

40
Q

When will the DG control equipment room normal AHU auto start?

A

Anytime its respective room temperature is greater than 105 degrees F.

41
Q

When will the DG room normal exhaust fan auto-start?

A

Anytime its respective room temperature is greater than 105 degrees F

42
Q

When should the clean/new fuel filters be selected on the DG?

A

Approx. 10 psid

43
Q

What are the injection pump(s) cooled by?

A

constant flow of fuel oil

44
Q

Where does the DG fuel oil day tank overflow go?

A

Back to the DG Fuel Oil storage tank

45
Q

What does the crankshaft in the DG do?

A

Coverts the reciprocation motion of the piston/connecting rods to rotational motion to drive the generator and auxiliary equipment.

46
Q

What do the camshafts on the DG do?

A

operate the fuel injection pumps and intake and exhaust valves to admit fuel and air into the cylinders and to discharge exhaust gases.

47
Q

What causes a generator differential?

A

When current into a generator winding is not equal to the current leaving that winding.

48
Q

When will the low engine oil pressure shutdown be bypassed?

A

20 seconds during startup and during shutdown when

49
Q

If we lose control air to the DG, can the diesel still start?

A

Yes. The fuel control cylinder requires air to turn “off” fuel. In this case the fuel control cylinder will always be “on”.

50
Q

What is a Blackout condition defined as?

A
  • Loss of off-site power
  • Main Generator trip
  • Both DG’s failed to start or failed to load onto the bus
51
Q

What supplies power to the Diesel Fuel oil transfer pumps?

52
Q

Where do the DG JW and LO circ pumps get power from?

53
Q

At what pressure do we get a DG engine lube oil pressure alarm/trip?

A

Alarm- 35 psig

Trip- 30 psig

54
Q

When will we get a JW high temperature trip?

A

205 degrees F

55
Q

If the DG would be running and we lose control air, what would be the only mechanical automatic trip that would trip the DG?

A

Overspeed shutdown butterfly valve (660 RPM)

56
Q

Explain the Fuel cylinder on a diesel start signal.

A
  • Off air is vented and “On” air is applied to the fuel cylinder and it fully shortens, thus positioning the fuel racks in the “full fuel position” or maximum.
57
Q

What does the injection pump do?

A

meter fuel according to engine load and deliver it to the injectors in timed relation with the engine firing order

58
Q

What do the fuel injectors do?

A

spray fuel into the cylinder where it is ignited by heat of compression

59
Q

What is some OE with painting and the DG?

A

Paint on the linkage of the jerk pump. Causes additional unneeded resistance on the pump.

60
Q

What is some OE with the DG first out and system reset button?

A

Button was pushed while restoring the DG. Do not push the DG first out and system reset if there are any DG trips or alarms in, unless directed by the CRS/SM.

61
Q

What is the mission time for the Emergency Diesel Generators at PV?

62
Q

What is the mission time of the Emergency DG Fuel system.?

A

Also 7 days

63
Q

Explain how the DG starts a SIAS and AFAS?

A

In the emergency mode in a “no load” standby.

64
Q

Explain the what the DG fuel cooler is cooling?

A

Actually cooling the bypass flow that is going back to the FOST. We don’t want pressure in the FOST raising. Which would be caused by the temperature rise.

65
Q

How does the turbocharger improve efficiency?

A

Delivering more oxygen to the engine and using exhaust air to drive the turbine

Area 4 (5 decks)

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