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4703 > EDGs > Flashcards

EDGs Flashcards

1
Q

What are the EDG Auto Starts?

A
  • Load Shed (Loads to Bus)
  • SI (does not load to bus)
  • LOOP
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2
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)
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3
Q

What are the EDG Trips available Without DC Power?

A
  • Mechanical Overspeed

- Worthington/Manual Fuel Valve (MFV)

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4
Q

What are the only EDG TRIPS available after the EDG Auto Starts on an SI, LOOP 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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5
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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6
Q

How do the starting air valves fail on a loss of 100# ctrl air?

A
  • Fail as is
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7
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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8
Q

Where does the field flash come from on a fast speed start?

A
  • Field flash comes from 1kV inverter
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9
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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10
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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11
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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12
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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13
Q

How can a load shed signal be disabled?

A

-When the EDG output breaker control switch is in close or lockout

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14
Q

When do run relays energize to allow power to bus?

A
  • Run relays energize at 95% running speed. At this point they start auxiliary equipment, input to Load Conservation, and provide necessary interlocks and permissives
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15
Q

What is disabled on a Slow Speed Start?

A
  • Jet Assist

- Field Flash

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16
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)
17
Q

How is Generator excitation/field flash failure affected on a loss of ctrl pwr while the diesel is running?

A
  • No impact
18
Q

Are the EDG trip relays energize or de-energize to trip?

A
  • Energize to Trip
19
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

20
Q

How is ctrl air designed to fail on a loss of 250V DC?

A
  • Valves will fail in a position such that a control air pathway will be available to the TCC
21
Q

What is the auto trip with a loss of 250V DC?

A
  • Mechanical Overspeed
22
Q

What supplies power to the EDG 1Kv inverter

A
  • 250V DC Battery Charger/Battery
23
Q

Will a loss of 250v DC cause the EDG to be in operable?

A
  • Yes, A loss of power will render the EDG inoperable, it can not auto start and load.
24
Q

If you lose normal power to the HVAC supply or exhaust fan, what does it swap to?

A
  • The EDG will power it
25
Q

What loads sequence on during a load shed w/out an SI?

A

CCW pump
ESW pump
MDAFW pump
NESW pump

26
Q

What loads sequence on during a load shed w/an SI?

A
  • 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)
27
Q

What powers the Normal and Alternate ESW cooling supply valves?

A

ABD-A and ABD-D (Train Specific)

4703 (11 decks)

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