Brainscape's Knowledge GenomeTM


Top Flashcards (Certified)
All Flashcards

system > diesel > Flashcards

diesel Flashcards

(76 cards)

Start Studying
1
Q

Purpose of EDG

A

EDG system is a safety related system that is installed as an ES system to provide an alternate source of power to the ES buses in the event of a LOOP. Provides power for safe s/d and c/d of primary plant when offsite power is NOT available

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

SBO diesel purpose

A

Used to backup EG-Y-1A/B by supplying either 1D or 1E 4160V bus of the 1C 4160V bus if 1D/1E have power

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

EG-Y-1A/B specs
Description, speed, gen

A

Fairbanks-Morse 12 cyclinder (2 cycle engine, 900 RPM (fast start), 450 RPM (slow start)
3.0MW w/ 3.3MW overload rating, 8 pole 4kv 60hz 3 phase

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

EG-Y-1A/B auto starts

A

On ES (won’t load) or UV (will load) on 4kv buses (2 of 3 via UV relays)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

EG-Y-1A/B exciter-regulator
(auto voltage reg)

A

Controls generator output by controlling field current
Auto voltage reg: compares generator output to setpoint
UNIT: ES standby mode with zero speed droop
Parallel: monthly testing when synched w/ grid, 70% speed droop

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

EG-Y-1A/B exciter-regulator
(Manual voltage reg)

A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Over-speed governor function

A

Stops engine if governor fails to hold the engine speed under max safe speed. Single weight and spring. On overspeed, weight moves outward overcoming spring pressure which forces lever and rod downward tripling latch

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Speed adjustment

A

Changes engine speed when running ALONE (isochronous, UNIT) or change LOAD when paralleled to system

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Speed droop control function

A

Adjusts the engines resistance to load change. A setting > 0 will cause decrease in engine speed when unit is running alone

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Speed droops control (what happens when paralleled to grid at 0 speed droop, when diesel hz>grid hz, and when diesel hz< grid hz

A

0 speed droop = unstable
Diesel hz > grid hz = Diesel assumes entire load of grid and go to overload
Diesel Hz < Grid Hz = Diesel will reject load (Reverse Power)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

EDG Trips
Parameter, type, on ES
Low Lube Oil Pressure

A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

EDG Trips
Parameter, type, on ES
Start Failure

A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

EDG Trips
Parameter, type, on ES
High Crankcase Pressure

A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

EDG Trips
Parameter, type, on ES
STOP pushbuttons (engine and control room)

A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

EDG Trips
Parameter, type, on ES
Low lube oil pressure
(running)

A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

EDG Trips
Parameter, type, on ES
86G Diesel Generator Fault

A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

EDG Trips
Parameter, type, on ES
Engine overspeed & emergency local trip

A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Emergency stop and reset lever
Function

A

Trips the overspeed governor. Engine CANNOT be restarted until the overspeed stop is reset with the Reset lever

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Unit/Parallel Switch function

A

Selects voltage droop mode and selects which rheostat pot controls the field strength. Unit position shorts out voltage droop resistor. Voltage droop ensure EDG does NOT carry excessive VAR loading

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

Shutdown Solenoid function

A

DC current used to energize S/D solenoid taking governor to no fuel position. ALL S/D interlocks ultimately energize this solenoid

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

Ready to load light

A

Comes on when >59 hz and >4100V

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

86G generator fault relays

A

Lockout relay must be reset at 1D/1E 4160V breakers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

AC EDG transfer pump
(DF-P-1A/C)
Auto start and trip setpoints

A

Auto starts: 20” level (from TOP of tank)
Trips: 15” from Top of Tank (high level), 13” HI-Hi with lockout
Auto starts: 24” level (from TOP) alarm comes in on pump start

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

DC EDG transfer pump (DF-P-1B/D)
Auto start, trips, control

A

AUTO Starts: 24” level (from TOP), Alarm comes in on pump start
Trips: 15” High Tank Level, 13” Hi-Hi with LOCKOUT
Control: Each pump has MANUAL-OFF-AUTO switches on EMMSB.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Duplex Filter Indication
10# differential pressure indicates dirty filter element
26
Fuel injection system function
Fuel injection pumps (2/cylinder) receive fuel oil at low pressure from engine driven/motor driven fuel pumps, measures it, builds high pressure, and delivers to fuel injection nozzle.
27
Fuel injection stick actions
IF fuel injector sticks, springs allow fuel injector rod to move even if 1 injector sticks allowing others to go to no fuel position.
28
Scavenging air flow Purpose
Removes exhaust gas during operation and acts as combustion air for next cycle
29
Blower (Supercharger) purpose
Provides scavenger air for starting and light load operation.
30
Inlet Air check valve action Startup (closed) Normal operation (open)
STARTUP (CLOSED) -> Valve plate closed when starting diesel NORMAL OPERATION (OPEN) -> Raising load creates suction, valve gradually opens to direct flow directly to turbo with only some flow to air blower.
31
EG-P-7A/B Jacket Coolant Pump (Engine Driven) function
Provides cooling to cylinder liner, turbocharger, and lube oil via Engine Driven EG-P-7A/B pump.
32
EG-P-8A/B Aux Jacket Coolant Pump Function
Used for standby heating when diesel shutdown
33
Air Coolant system Function
Designed to cool the scavenging air before it enters the engine. **Supplies cooling for the fan driven gear box via Engine Driven EG-P-2A/B.** Rejects its heat in the Air Cooler Coolant Radiator.
34
Standby Heater System Purpose
**Used when the diesel is NOT operating or <250rpm to maintain oil temperature** in engine sump warm while engine not running
35
Standby Heater system interlock
**Heater is interlocked with pump so it can ONLY OPERATE when the pump is running. **
36
Diesel Lube oil system purpose
Removes friction by lubrication. A lubrication oil booster/accumulator is installed that supplies the upper main bearings with lubricating oil during the diesel start.
37
Low Lube Oil Pressure Switches (OPLS, **OPL1, 2, 3**) Purpose/setpoint
OPL 1, 2, 3 protection during normal operation trips diesel at 16@ lowering (2 out of 3) with ES or NO ES.
38
Low lube oil pressure switch OPLS Function/setpoint
OPLS for prolonged low speed, no load operation, activated 20 sec after 250 rpm. Set at 7# lowering OR <=16# after reaching 810 rpm. Trips Diesel (defeated by ES).
39
Two air start Reservoirs (EG-T-1A/B-1/2) Function, capacity
Function: Two per diesel generator to provide motive force for initial rotation of engine on startup. Capacity: 225
40
What reservoir pressure will diesel start at
>100# reservoir pressure but won’t load in 10 second mission time
41
Air start Compressors (EG-P-1A/B) Power supply and backup
1A ES MCC/1B ES MCC Provided with separate 12v dc battery and charger
42
Emergency Diesel Air Start Solenoids (EG-V-16A/B/C/D) Function
De-energized to inject air directly to start pistons moving (which drives the engine driven fuel injection pumps) starting the engine.
43
Emergency Diesel Air Start Solenoids (EG-V-16A/B/C/D) Fail position
OPEN on loss of power (1P DC, 1Q DC). This means the diesel generator will START on loss of power.
44
EDG Testing 2 hour loaded run
@ Defeat AS1 (Air Start 1) or AS2 (AirStart 2): On Defeat AS1, diesel starts on AS2. On defeat AS2, diesel starts on AS1 If an ES comes in while Group 1 or 2 are selected when actual ES or UV occurs, ES comes in other side to start diesel.
45
EDG Testing 2 hour loaded run Third switch function
Third Switch allows bypass of air start solenoid contacts to test individual solenoids Every month you select different EF-V-16 to air start diesel
46
EDG Testing Quarterly Test Switch
**ES Test switch in Group 1 position (“A” start relay) causes diesel to start ONLY on “A” relay during LOOP/ES.** Drops out connection to air start relay so you get light indication but no EDG start.
47
EDG testing Power Transfer Test
2R frequency, 1 EDG per outage
48
Diesel Room Ventilation EDG Room supply fan (AH-E-29A/B) function
provide heating and ventilation for the diesel generator control rooms.** AH-E-29A/B suction lines are the path for diesel combustion air (fan discharges do NOT provide combustion air.)**
49
Diesel Room Ventilation Heater trips Fan Trips Other considerations
Heater trips: 160F heater trips (auto reset) 190F heater trips (manual reset) Loss of air flow de-energizes heating coils Fan trips: 125F IF AH-E-29A/B (EDG room supply fan) is NOT available, declare associated EDG INOPERABLE and enter appropriate 3.7.2 clock
50
SBO Diesel (EG-Y-4) Purpose
Provides power to ES buses and “C” 4kv on station blackout
51
EG-Y-4 (SBO diesel) Electric generator ratings
3000kw (3MW) w/ 3.3MW overload rating. 8 pole, 4160v, 60 hz, 3 phase generator
52
SBO diesel interlocks
High crankcake pressure (2 of 3) > 0.5” Water Low Lube Oil Pressuer Idle <5# Start Failure <250rpm or <20# lube oil pressure in 9 seconds Low Lube Oil Pressure Running (2 of 3) <16# when >810rpms 86G Differential Overcurrent **must be reset at 1F 4160V Bus** Overspeed Trip 960-1020
53
SBO Diesel CAN’T cross connect multiple 4kv busses to 1F 4kv SBO bus Explain interlock
Interlocks look at breaker 52 contacts (not an admin interlock). For example, if SBO diesel sees 1C breaker 52 contacts CLOSED, it won’t close onto 1D 4kV. The normal feeder breaker must also be OPEN.
54
SBO Diesel 1Y 480 V disconnect switch has NO kirk key interlock Explain
It will be Opened under load only by procedurally opening 480V feeder to minimize arc damage
55
What provides DC control and DC motor power for the SBO diesel
A 1R DC distribution panel in the SBO diesel switchgear room is normally supplied by the battery charger
56
SBO Diesel Emergency Operations
Automatic ES load sequencing is NOT permitted while the SBO diesel is supplying power to 1D or 1E bus. Large ES motors should remain in PTL unless operation is required. When operation is required, large ES motors should be started one at a time
57
Diesel Generator Operations Unit switch position function
Shorts out voltage droop resistor
58
Diesel Generator Operations Parallel switch position function
Allows voltage droop circuit to work, this ensures EDG doesn’t carry excessive VAR loading if grid voltage drops
59
Speed droop purpose
Prevents EDG from trying to control grid frequency when connected to grid.
60
ES Standby conditions
Diesel set to AUTO start on ES with Speed droop at 0% and unit/parallel switch in Unit Control switch on EMIP at Normal **SDR (auto electronic trips) and 5A (gen fault and manual electronic trip) are TRIP RELAYS**, should be de-energized in relay cabinet, they prevent EDG restart for 60 secs
61
*Low speed/load ops Pre cautions*
Running diesel at low speed or low load can lead to build-up of oil in exhaust (fire hazard). You must load the diesel to 50% (1.5 MWe) for 30 minutes and load to 100% for 1 hour prior to shutdown.
62
**What are the conditions and sequence of events for the Emergency Diesel Generator (EDG) to automatically start and connect to the bus?**
The EDG will AUTO Start on an ES signal (4# RB, 1600#, or 500# RCS) OR on a loss of voltage 3760 for 10 sec or 2400V for 1.5sec. Diesel Gen breaker CLOSES when diesel is up to speed and voltage, both normal bus feeder breakers OPEN, and bus was de-energized for >3 seconds. Time delay allows fields to collapse before closing breaker and block loading.
63
Emergency Diesel Operations How to stop a runaway diesel?
Only way to stop a runaway diesel is to CLOSE air intake EG-V-15A/B **and** inject CO2 into air intake or diesel itself.
64
What happens on loss of 1A/1B DC power?
While operating in PARALLEL, excitation is lost but no power to OPEN 4kV breaker. Requires immediate tripping of gen breaker using manual plunger (inside 4kV breaker) to stop motoring and limit damage.
65
What happens on loss of 1P/1Q DC power?
Excitation lost but output breaker will OPEN. Diesel can only trip on overspeed (loss of interlocks)
66
What happens to the Emergency Diesel Generator (EDG) if it is in standby mode and an automatic start is initiated?
IF in STANDBY, diesel will AUTO Start (air start valves fail OPEN), exciter INOPERABLE, Diesel cannot be stopped by ANY electrical pushbuttons (MCR, 1E Bus, EMIP)
67
What to do if EDG is in standby and Ready to Load Light is NOT Illuminated following start?
Must adjust ES voltage rheostat (local) to >4.1kV since Console exciter in AUTO or place CR exciter in MANUAL and use console rheostat
68
Precautions & limitations If DC is lost to the D/G and its 4160V ES bus while operating in parallel with the grid what do you do?
then the generator breaker must be tripped immediately using the manual plunger at the breaker. This will stop motoring of the D/G and limit damage to the generator.
69
How many gallons required in DT-T-1 to support EDG operations?
25,000 gallons, DF-LI-152 must indicate 98 inches (dipstick would have to be >99 – 9/16” )
70
What low receiver air pressure setpoint would declare EG-Y-1A/B inoperable?
<175# and EG-Y-1A/B is not running
71
Which dampers, if NOT available would consider the diesel inoperable?
AH-E-29A/B
72
What position of voltage control position in requires CRO and AO to perform voltage adjustments at panel rheostat?
Voltage control in: **Auto**
73
Administrative time clock must be entered for how many days if what happens?
14 days, if SBO diesel is removed from service for extended periods.
74
OP-TM-864-901 What is not permitted if SBO diesel is supplying power to 1D or 1E 4kv bus?
Auto ES load sequencing
75
What position should Large ES motors be in, how should they be started if needed?
Pull to lock, started one at a time if needed
76

system (16 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions