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51 Cards in this Set
- Front
- Back
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describe the function of the EDGs
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supply independent, auto emergency source of electrical power to safeguard busses if normal & reserve power are lost. (10 seconds) load shed or SI.
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describe the fly ball weights
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mounted on output shaft & provides mechanical governor control if electric governor control fails. (governor uses to see what speed is)
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describe the mechanical linkage
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mechanically transmits the governor output to the fuel injector racks. (loss of hydraulics causes fuel racks to move to minimum position)
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describe the fuel racks.
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transmits the input from the mechanical linkage to control the stroke of the fuel injector pumps.
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describe the fuel injector pumps
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injector fuel into individual cylinders in the correct quantity to control engine speed.
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describe the electric governor
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engine speed and breaker position input to the edg governor to provide a speed correction signal & determine whether the governor operates in the isochronous or speed droop modes. (controls fuel to control speed)
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describe the mechanical governor
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controls engine speed if the electric governor fails. speed set point is higher than the electronic governor . (loss of control power places unit in service)
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describe the manual starting air valve.
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allows a manual edg start during a loss of 250vdc by aligning 40Psig control air through the fail ports of sv1,2,3 to pov-1,2 and jav-1. (push back in to avoid losing air pressure)
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describe the manual fuel valve
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allows operator to shutdown edg even w/loss of 250vdc
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describe the starting air valves
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admit 240psig starting air to the engine through starting air manifolds Which align air to each engine cylinder through air distributor & inlet valves during piston down stroke.
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describe the throttle control cylinder
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allows fuel racks travel to respond to engine governor air-operated, spring opposed cylinder with a normally spring entended actuating piston. valves fail such that air flow is available to TCC.
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describe the solenoid operated 3-way pilot valves.
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supply control air path to pov-1,2,4 & jav-1
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describe the solenoid operated 3-way valves for operating modes selection
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determines if electric or mechanical governor is In control. (when de-energized , passes control to pov-4 allowing TCC to retract.)
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fuel oil day tank
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tech spec has 70 usable gallons that gives you 16 mins to see what is wrong
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fuel oil storage tank
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46,000 gallon tech spec limit allows for one diesel to run @ full capacity for 7 days.
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lube oil tank
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tech spec is 395 gal. need 500 gal to run.
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fuel oil transfer pumps location.
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u1 supplies both units CD. u2 supplies both units AB
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fuel oil storage tank location
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CD on u1 side. AB on u2 side.
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describe the lube oil system for edgs
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keeps diesel supplied with clean lube oil @ proper temp.
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describe the edg fuel oil system.
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stores, transfers & supplies fuel oil for use in diesel.
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describe the jacket water system.
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cools engine cylinders, turbo charger & governor oil system, aux jacket water pump runs while diesel is off.
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describe the edg starting air system
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provides compressed air @ 240psig for starting engines, assists turbo with acceleration. another header taps off for 100psig valve control
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describe the edg crankcase breather system
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removes oil vapors & minimize oil leakage from the crankcase
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describe the edg intake air and exhaust gas system.
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provides clean cool air for combustion. collect hot burned gasses discharged from the diesel & directs it through the turbo charger to atmosphere.
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describe the edg Woodward governor system
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maintain engine speed while operating in any configuration.
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describe the edg generator excitation system
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can help create magnetic field if generator is not creating a strong enough field.
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flow path of lube oil system
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lube oil sump tank acts as reservoir for lube oil as the engine is not provided with an internal sump
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flow path of fuel oil system
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only in service during diesel runs. storage tanks to transfer pump, through filter to day tank, gravity drains from day tank to filter and fuel pump to edg.
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flow path of jacket water system.
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normally usues demon water from mup. backup source is esw
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flow path of starting air system
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starting air compressor to air receivers. can go through reducer filters to air control valves or it can go to starting air valves.
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flow path of crankcase breather system.
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maintains negative pressure to prevent leaks. removes air from oil and sends oil back through oil seperator. air vents to atmosphere.
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describe the flow path of intake and exhaust gas system.
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turbo charger compressor takes suction on the outside air through a filter & air silencer.
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describe the function of the diesel generators room ventilation system.
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(recirculation cycles on temp 70-95 degrees) maintains temperature in the diesel room between 60-130 degrees and the interior of the control panels less than 104 to extend life of equipment
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describe the function of the esw system as a support system to the edgs
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removes heat from the induction air in the turbo charger after coolers, circulating lube oil & jacket water systems at their respective coolers.
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describe how the lube oil system is aligned for an auto start of edg
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when shutdown, continuously purified by the bypass filter pump and filter (takes suction on lube oil tank & discharges to filter)
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describe how the jacket water system is aligned for an auto start of edg
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when shutdown aux jacket water pump /heater maintains temperature 140-155. takes suction off main return header , discharges through electric heater.
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describe how the fuel oil system is aligned for an auto start of edgs
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two pumps per diesel. normally in auto
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describe how the local sub panel settings are in auto start of edg
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regulator in auto,remote control
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automatic or manual trips for edg (bigcflange)
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bearing high temp, incomplete start, generator overcurrent,cardox actuation,fuel oil extreme low pressure,lube oil low pressure, air chest pressure high, neutral ground overcurrent, generator phase differential, electrical overspeed.
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automatic or manual start for edg
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start & come up to rated speed & voltage in 10 secs on load shed or SI.
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describe an incomplete start signal
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failure to reach 95% speed, 80% voltage in time
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edg output breaker closure
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capable of auto closure to the safety busses when edg @ 95% speed & 80% voltage output breakers close.
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edg emergency mode auto trips
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electrical overspeed, generator phase differential, incomplete start.
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edg loss of 250vdc trips
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maunual pull button on Worthington control module (manual fuel valve). mechanical overspeed. (same with appendix r)
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locate the TCC
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@ top of diesel near the end by governor.
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describe the throttle control cylinder positions for various system alignments.
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allow the edg to be rolled using air jack without the potential of starting. (the throttle control cylinder keeps the fuel racks closed to prevent fuel from entering Injector & cylinder) the knife switches in control room defeats trip interlock to allow diesel to roll. (withdrawn, not extended)
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explain why extension tools are used on the pet cocks.
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to prevent oil from spraying sensitive equipment.
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discuss disposable of fuel oil sample collected after diesel run.
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waste collection locker outside misc lube oil room.
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describe the aeo actions prior to and during diesel run
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monitor, local readings, check for leaks.
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describe equipment monitored during run.
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lo temp, jw temp, filter d/p, lube oil tank level.
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describe the post edg run actions taken
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remove sample from day tank to check for water. auto start alignment.
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