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Systems > EDG Aux > Flashcards

EDG Aux Flashcards

1
Q

What is the rating of the EDGs?

A

20 cylinder, 900 rpm, 2600kW

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2
Q

How long can an EDG be run unloaded before it will need to be run fully loaded? for how long? Why?

A

Can be run unlaoded 4.5 hr before needing >1hr fully loaded.
Fully loaded run needed to remove carbon buildup in exhaust line. Full load run produces exhaust gas hot enough to burn off the carbon deposits

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3
Q

What is the load carrying capacity of the EDG?

A

Each EDG capable of carrying ECCS power requirements for 2 hrs - 10% overload rating of EDG
Capable of carrying ALL SSD loads

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4
Q

What is the purpose of the EDG Air Start SYstem?

A

Provides all of the equipment necessary to compress, store, and deliver high pressure air sufficient to start the diesel engine without reliance on AC electrical power

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5
Q

On an EDG Start Signal, what does the Air Start System to?

A

Air Start Solenoid ENERGIZES - energized by 125vdc;
Air routed through air start solenoid to pinion of 1st motor, then to 2nd motor
Air operates a diaphragm against spring pressure to open Air Start Relay;
Relay routes air to Air Start Motors (BOTH MUST ENGAGE TO ROTATE ENGINE)

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6
Q

What is the air start requirement/pressure/sequence for starting the EDG?

A

If 70 psig air pressure not sensed at inlet to air start motor w/in 3 seconds of start signal, start solenoid is de-energized and 1 second later the start solenoid is re-energized to attempt another start (15 seconds total before lockout)

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7
Q

What RPM must the EDG be able to achieve from Air Start Motor in order to start?

A

75rpm

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8
Q

What is required from the Air Start System for EDG to be Operable?

A

Must be able to start the EDG in 10 seconds
1 bank of receivers is required to keep operable
1 bank at >220psig provides enough air and pressure for 3 starts
1 bank at >175 psige will only provide 1 start - 48 hr to restore

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9
Q

What is the purpose of the EDG Jacket Water Cooling System?

A

Closed loop water system, which removes heat of combustion during diesel engine operation.
During standby conditions, the system maintains engine in pre-warmed state using an IMMERSION HEATER

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10
Q

What is the design capacity of the Jacket Cooling Water System?

A

Sufficient heat removal to maintain engine coolant outlet temp below 190F using engine driven water pumps

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11
Q

How does the Jacket Cooling Water System Cool the Engine?

A

Water flows through the engine, lube oil cooler and DGCW Hx.

Uses a Hx to cool the water with Service water Via DGCWP as a heat sink

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12
Q

What is the purpose of the Jacket Water Cooling System Immersion Heater? Power Source? Temp Range?
Interlock?

A

Used to maintain water 125F to 155F to pre-warm engine when in standby
Powered by 28-3/38-3/29-4 (Only Opp Div ONLY component)
On Engine Start heaters inhibited when speed >200rpm

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13
Q

What is the Immersion Heater impact on EDG Operability?

A

INOP of oil temp <85F

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14
Q

What is the purpose/Flow Path of the Jacket Cooling Water System TCV?

A

It splits the flow between teh HX and the Bypass Line

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15
Q

What is the Purpose of the DG Cooling Water System?

A

Open Loop system providing a heat sink for the EDG Jacket Water System through Hx.
May also be used as alternate source of water for ECCS Room Coolers and CCSW Keep Fill

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16
Q

When does the DGCWP Start?

A

Immediately on EDG Start Signal - start of DGCWP will maintain CCSW System full and ready for system startup

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17
Q

What is the Cribhouse Intake Temperature Impact on the EDG?

A

If Intake >95F then DGCW and CCSW Systems INOP

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18
Q

How many EDG CWPs can take suction off the same CW bay?

A

NO MORE THAN 2 ARE ALLOWED TO TAKE SUCTION OFF THE SAME SOURCE

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19
Q

When the DGCWP is aligned to ECCS RM Cooler, what is the condition of the EDG?

A

INOP

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20
Q

How long can EDG Run w/out cooling?

A 
Slow Idle (450rpm)- 42 Min
Fast Idle (900rpm)- 10 Min
Fully Loaded (900rpm)- 3 min
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21
Q

What limitations are there on CCSW with the 2/3 EDG in service? WHY?

A

With 2/3 EDG loaded:
If inlet (INTAKE) temp <82F No restrictions
>82F &<91F - no more than 3 U2 CCSW Pumps
>92F - no more than 2 U2 CCSW Pps

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22
Q

Where does EDG Cooling Water Discharge to?

A

Service Water 36” Discharge Header for U2 and U3

2/3 discharges to U2 CCSW Discharge Header - then 48” SW Header

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23
Q

What are teh power sources for the EDG CWPs?

A

U2: 29-2
U3: 39-2
2/3: 28-3/38-3

(They match their EDG Division)

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24
Q

What is the purpose of the Lube Oil System for the EDGs?

A

To remove the heat of conbustion during diesel engine operation. During Standby conditions, the system maintains the engine in a pre-warmed state by use of an immersion heater.

25
Q

What are the Pumps associated with the EDG Lube Oil System and their power sources?

A

Turbo Oil Pump : - dedicated flow to turbocharger for bearing lube and residual heat during shutdown - 28-3; 38-3; 29-4
Circ Oil Pump: Circs Oil through accessory racks to maintain oil level and provides pressurized oil to main crackshaft bearing and engine gallery: same as TOP

Engine Driven Pumps:
Scavenging Oil Pump : Suction to Main and Piston Oil Pumps
Piston Pump: Supplies oil to cool and lube piston pin bearing and cylinders
Main Oil Pump: Supplies oil to main bearing, gear train camshaft and rocker arm

26
Q

How does the Main Oil Pump supply oil to the crack shaft?

A

A feeder tube supplies the crankshaft main bearings

27
Q

Which Lube Oil systems are continuously running?

A

Turbo (Soak Back) and Circ Oil Systems:

These two help to remove the latent heat from the components and provide pre-lube. Both take suction off engine oil sump.
Powered by 28-3, 38-3, 29-4 (Opposite Division)

28
Q

What local oil indications should exist when the engine is in standby and operating?

A

Standby: Upper bullseye should have no oil, lower bullseye should be full
operating: Both should be full
IMMEDIATELY after shutdown: both will be empty for ~10min

29
Q

What is the capacity and required fill level for the EDG Main Fuel Oil Tanks?

A

15,000gal capacity; Requires 10,000gal or 7day LCO

30
Q

How long is the fuel in the main fuel tank expected to be able to supply the EDG?

A

2 days at full load or 4 days at half-load

- MUST BE ABLE TO DELIVER REPLACEMENT FUEL W/IN 8 hr

31
Q

What is the capacity of the EDG day tanks? Supply time for EDG? How does it get refilled?

A

700gal tank to supply 4hr run @ 100% load
TS requires 245gal min to run 1 hr at 110% load
Kept full using Fuel Oil Transfer Pump autocycle w/ level switch

32
Q

How is the EDG emergency shutdown performed?

A

Fuel Rack Lever (preferred)

Emergency shutoff switch

33
Q

What other components can the EDG Fuel Oil Transfer Pump supply? What happens when these other components are being supplied?

A

U2 FOTP can supply IC Make-up pumps
U3 FOTP can supply 2/3DFP
When these configurations are lined-up the associated EDG is INOP

34
Q

What is the purpose of the Combustion and Exhaust Air systems for the EDG?

A

Diesel engine combustion air sysstem provide compressed air to teh engine cylinders in the quantity necessary to support diesel fuel combustion. Exhaust system ports away exhaust fumes

INtake and exhaust from roof

35
Q

What is the EDG Turbocharger purpose?

A

Converts thermal energy of exhaust gas into work by compressing intake air - provides the motive force to an ejector to maintain negative pressure in crankcase when EDG is running

36
Q

When does the EDG Ventilation System Start? When does it shutoff

A

Auto Start when EDG reaches 800rpm

Must be manually secured

37
Q

When in standby, what provides the U2 and U3 EDG room ventilation?

A

TB Vent (Not the engine room vent system)

38
Q

Where does the EDG Room Vent take suction?

A

From the vent penthouse on the roof

39
Q

What are the requried temperatures that ventilation is intended to maintain in the EDG rooms? Basis?

A

Max 140F - prevent damage to electrical components
Min 45F - based on ability of EDG electric heater and Circ Oil system to maintain the engine warm and ready to fast start

Jacket water does not have antifreeze, so this helps to keep above freezing

40
Q

What operates the EDG Room Dampers?

A

Normal: IA

Backup : N2 air cylinders

41
Q

Which components of EDG share common breaker?

A

Immersion heater and lube oil Circ Oil Pump

42
Q

What position must the control switch for EDG be in to autostart?

A

Must be in AUTO

43
Q

WHat is the power supply scheme for the 2/3 EDG auxiliaries?

A

Powered from U2 UNLESS:
U2 (28-1/28-3) not available
2/3 EDG tied to U2 and is not tied to U2
U3 ECCS and not tied to U2
Local C/S for aux selected to U3

44
Q

What are the EDG Trips?

A 
Bypassed on Auto Start:
Hi Crankcase Pressure (0.8" H2O)
Low Water Pressure (<35# after 2min >800rpm)
Hot Engine (200F)
Low Oil Pressure (<17# 2min &>200rpm OR <44# 2 min >800rpm)
Never Bypass:
Engine Overspeed
Gen. Hi Differential Current
45
Q

What sequence creates a lockout during autostart?

A

If engine fails to reach 200rpm w/in 15 second of start signal - failure to start occurs and engine is locked out

46
Q

What are teh droop settings for the EDG and when are they enabled? Why?

A

5 during normal/emergency operation so that there is minimal frequency drop as ECCS systems are picked up
55 during tests lined up to the grid to prevent overloading the EDG

47
Q

How can the Circ Oil Pump or Turbocharger Oil Pump cause EDG INOP?

A

If they are off for more than 48 hours OR Lube oil temp <85F, EDG INOP

48
Q

What is performed if EDG cools to <87F?

A

DOA directs to install heaters in room

49
Q

What happens to the EDG on loss of 125VDC?

A

If in standby: EDG will not start

If running: EDG governor shutdown solenoid will not energize preventing engine from shutting down

50
Q

What happens on failure of EDG Vent Start?

A

High Temp Alarm Likely

51
Q

In what conditions is the EDG INOP?

A

Air start valve closed
EDG is loaded for testing (due to droop setting)
When paralleled to grid
Less than 10000 gal in tank (or FOTP aligned to other component)
ANY SUPPORT SYSTEM NOT ABLE TO PERFORM INTENDED FUNCTION
EDG Low Tem <85F

52
Q

What are teh autostart signals for the EDG?

A

Undervoltage on 4kV-1
Undervoltage on 4kV bus that feeds 4kV-1 bus
Main feed breaker open at 23-1/24-1
Both Main Feed &Reserve Feed Breaker open to 4kv Bus feeding dash bus
ECCS Signal of 2# DW or -59” (no time delay)

53
Q

What is the power source for the DGCWP?

A

U2: 29-2
U3: 39-2
2/3: 28-3/38-3

54
Q

What is the power for the EDG Fan and FOTP?

A

U2: 29-2
U3: 39-2
2/3: 28-1/38-1

55
Q

What is the power supply for the EDG Circ Oil Pumps?

A

U2: 28-3
U3: 38-3
2/3: 29-4

OPPOSITE DIVISION

56
Q

What is the power source for the EDG Immersion Heater?

A

U2: 28-3
U3: 38-3
2/3: 29-3

(OPPOSITE DIVISION)

57
Q

What is the power source for teh Starting Air Compressors?

A

U2: 28-2 / 29-2
U3: 38-2 / 39-2
2/3: 28-1 / 38-4

There are two, one from each division

58
Q

What is the power supply for the AIR START SOLENOID?

A

EDG DC

59
Q

What supplies EDG Logic/Control Power?

A

U2: 2B-1
U3: 3B-1
2/3: RB Dist Panel (U2 normal, U3 alt)

Unit EDGs are Div 2 - Essential components; 2/3 EDG is Div 1

Systems (97 decks)

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