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737-800 SAI > Electrical System > Flashcards

Electrical System Flashcards

1
Q

BAT DISCHARGE (AMBER LIGHT)

A

With the BAT switch ON, excessive battery discharge is detected

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2
Q

TR UNIT (AMBER LIGHT)

A

On the ground: Any TR has failed

In flight: TR1 or TR2 and TR3 has failed

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3
Q

ELEC (AMBER LIGHT)

A

A fault exists in the DC power system or the Standby power system. The ELEC light is inhibited in flight

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4
Q

BAT (SWITCH)

A 
BAT Switch (OFF) : Removes power from the battery bus and switched hot battery bus when operating with normal power sources available.
Removes power from the battery bus, switched hot battery bus, DC standby Bus, Static inverter and AC standby bus when battery is the only power
BAT Switch (ON) (Guarded Position) : Provides power to the switched hot battery bus
Energizes relays to provide automatic switching of standby electrical system to battery power with loss of normal power
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5
Q

DRIVE (AMBER LIGHT)

A

IDG low oil pressure caused by: IDG failure, Engine Shutdown, IDG automatic disconnect due to high oil temp, IDG disconnected through the generator drive DISCONNECT switch.

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6
Q

STANDBY POWER OFF (AMBER LIGHT)

A

One or more of the following busses are unpowered: AC standby bus, DC standby bus, battery bus

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7
Q

STANDBY POWER (SWITCH)

A

AUTO:
COND: In flight or on the ground and the AC transfer busses powered..
AC standby bus is powered by the AC transfer bus #1
DC standby bus is powered by the TR 1/2/3

COND: In flight, or on the ground, loss of all AC power
AC standby bus is powered by battery through the static inverter
DC standby bus is powered by battery
Battery bus powered by battery

OFF (Center position): STANDBY PWR OFF illuminates and AC standby bus, static inverter, and DC standby bus are not powered

BAT (UNGUARDED POSTION):
AC standby bus is powered by battery through the static inverter
DC standby bus is powered by battery

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8
Q

GRD PWR (SWITCH)

A

OFF: Disconnects ground power from AC transfer buses
ON:
- Removes prev connected power from AC transfer busses
- Connects ground power to AC transfer busses if power quality is correct

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9
Q

TRANSFER BUS OFF (AMBER LIGHT)

A

related transfer bus is not powered

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10
Q

SOURCE OFF (AMBER LIGHT)

A

No source has been manually selected to power the related transfer bus or the manually selected source has been disconnected
Note: if the other transfer bus is powered, both transfer busses will be powered via the BTB

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11
Q

GEN (SWITCHES)

A

OFF: Disconnects IDG from the respective AC transfer bus by opening generator circuit breaker
ON: Connects IDC to the respective AC transfer bus by disconnecting previous power source and closing the generator circuit breaker

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12
Q

BUS TRANSFER (SWITCH)

A

Auto (guarded position) :

  • BTB’s operate automatically to maintain power to AC transfer busses from power source.
  • DC cross tie relay automatically provides normal or isolated operation as required

OFF :

  • isolates the AC transfer bus 1 from AC transfer bus 2 if only 1 IDG is supplying power to both AC transfer buses
  • DC cross tie relay opens to isolate the DC bus 1 from DC bus 2
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13
Q

APU GEN (SWITCHES) (OFF)

A

Scenario: APU generator powering both AC transfer buses

  • moving a single APU GEN switch to the OFF illuminates related SOURCE OFF light. APU continues to power both AC transfer busses
  • Subsequently moving the other APU GEN switch to OFF disconnects APU generator from the tie bus and removes APU power from AC transfer buses
  • If 1 APU GEN ON and 1 IDG GEN are powering the AC transfer busses moving the APU GEN OFF will result in the 1 IDG powering both AC transfer busses
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14
Q

APU GEN (SWITCHES) (ON)

A

Scenario: Neither AC transfer bus powered by IDG - moving a single APU GEN switch ON:

  • connects both AC transfer busses to the APU generator
  • disconnects external power, if connected
  • opposite SOURCE OFF light illuminates until the other APU GEN switch is moved to ON

Scenario: Both AC transfer busses powered by IDG’s - moving an APU GEN switch ON:

  • powers the related AC transfer bus from the APU generator
  • other AC transfer bus continues to receive power from the IDG
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15
Q

Electrical System is primarily powered by ?

A

2 engine IDG’s

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16
Q

An IDG supplies what kind of power ?

A

3 phase, 115 volt, 400 cycle alternating current (AC)

17
Q

What supplies DC power ?

A

TRU (28 volt) and the main battery / battery charger

18
Q

What supplies backup power for the AC / DC standby system

A

The main and aux batteries

19
Q

External power is what kind of power

A

AC

20
Q

What does the AC power system consist of ?

A

transfer bus, a main bus, two galley buses, and a ground service bus

21
Q

What supplies power to the AC standby bus

A

Transfer bus 1

22
Q

Automatic Load shedding (engine generators)

A

For single GEN operation: galley and main bus on transfer bus 2 shed first followed by galley and main bus on transfer bus 1

23
Q

TRU’s convert (blank) AC into ?

A

TRU’s convert 115 volt AC to 28 volt DC

24
Q

TRU #1 gets power from ?

A

AC Transfer bus #1

25
Q

TRU #2 and #3 get power from ?

A

AC Transfer bus #2

26
Q

TRU #3 has back up power from ?

A

AC Transfer bus #1

27
Q

Under normal conditions what do TRU #1/2/3 power ?

A

TRU #1/2 power the DC bus #1/2 and the DC standby bus

TRU #3 power the battery bus and serves as a back up power source for TRU #1/2

28
Q

What kind of batteries ? How many ?

A

2 batteries (main and aux) , 24 volt nickel-cadmium batteries

29
Q

How long can the batteries provide standby power?

A

60 mins when fully charged

30
Q

Battery voltage range

A

22-30 volts

31
Q

What DC busses are powered from the battery following a loss of both generators?

A

Battery bus
DC standby bus
hot battery bus
switched hot battery bus

32
Q

The standby system provides what kind of power?

A

115 volt AC and 24 volt DC to essential systems in the event of loss of all engine or APU driven AC power

33
Q

What does the Standby power system consist off?

A 
Static inverter
AC standby bus 
DC standby bus
battery bus
hot battery bus
switched hot battery bus
main battery
aux battery
34
Q

The static inverter converts what power

A

24 volt DC from the battery to 115 volt AC to supply the AC standby bus during loss of normal electrical power

35
Q

The static inverter is controlled by the ?

A

Standby power switch and the battery switch on the overhead panel

737-800 SAI (15 decks)

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