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FCOM > Electrical systems > Flashcards

Electrical systems Flashcards

1
Q

Three kind of current are available:

A
  • Direct current (DC)
  • Alternating current with constant frequency (AC)
  • Alternating current with variable frequency (ACW)
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2
Q

The two DC:

  • starter
  • generators
A
  • From 0 to 45% NH as a NH starter mode

- Above 61,5% NH generator mode

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3
Q

DC power voltage …

A

28 VDC

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4
Q

The ACW Generator is driven by the … , and is available when …

A
  • Reduction Gear Box

- NP > 66%

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5
Q

Is there ACW available in Hotel Mode or with the propeller feathered ?

A

No

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6
Q

When the propeller is unfeathered (CL in AUTO), the NP is maintained at a minimum of … , in order to have ACW
(minimum 66%)

A

70,8%

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7
Q

The GND HDLG BUS is disconnected when …

A

Airborne

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8
Q

BAT OFF or BAT ON with the EXT PWR not available, the GND HDLG BUS is supplied by the HOT MAIN BAT BUS for ground
servicing only when:

A
  • The refueling panel is open
  • The cargo door control panel is open
  • The passenger door is open
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9
Q

If the GEN are available, will the GPU operate ?

A

The GPU has always priority

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10
Q

Batteries:

  • MAIN
  • EMER
A
  • 24V Ni-Cd, 43 Ah

- 24V Ni-Cd, 15 Ah

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11
Q

TRU (Emergency supply)

A

The TRU provides power to the emergency loads in case of dual DC generators loss.
It is supplied by the ACW bus 2.

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12
Q

TRU

A

Transformer Rectifier Unit

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13
Q

BTC

A

Bus Tie Contactors

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14
Q

The BTC is used in case of generation failure, and it …

A

Connects the networks (left and right)

- Allows DC BUS 1 and 2 on line when only one generator is operating (Hotel Mode operation or GPU)

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15
Q

ACW to DC through TRU …

A

ACW power 115V/200V - DC power 28 VDC

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16
Q

GCU

A

Generator Control Unit

- One for each generator and provides the control for the generator contactor and the start contactor

17
Q

BPCU

A

Bus Power Control Unit

- Provides control for BTC, BATTERY START CONTACTOR, load shedding, EXTERNAL POWER functions and SVCE BUS contactors

18
Q

The DC distribution consists of … buses and they are the following:

A
  • 11
  • Two main buses: DC BUS 1 and 2
  • HOT MAIN BAT BUS and HOT EMER BAT BUS
  • DC EMER BUS, DC ESS BUS and DC STBY BUS
  • UTLY BUS 1 and 2
  • DC SVCE BUS
  • GND HDLG BUS
19
Q

SHED on the DC panel sheds the …

A
  • DC SVCE BUS

- DC UTLY BUS 1 and 2

20
Q

How many static inverters are there ?

A

2

21
Q

The static inverters …

A

Convert ACW to AC constant frequency

22
Q

AC power (constant frequency)

A
  • VAC 26 V

- VAC 115 V

23
Q

UNDV

A

DC STBY

24
Q

OVRD

A

Xfer/stby busses from HOT MAIN to HOT EMER BAT BUS

25
Q

Arrows

A

Emergency supply indicators (respective battery discharging)

26
Q

EMER BAT CHG - FAULT

A

Overheat detected by MFC or failure of contactor.

ELEC on CAP.

Contactor auto opens if: thermal runaway/bus voltage

27
Q

Bat sw - OVRD

A

Insures basic mode operation by overriding all other protections

28
Q

Bat sw - ON

A
  • Basic mode: STBY busses supplied by HOT MAIN BAT BUS.

- Ext or gen power: DC STBY bus transferred to HOT EMER BAT BUS AC STBY BUS to DC BUS 1

29
Q

Bat sw - OFF

A

ESS BUS, DC STBY BUS + INV 1 are isolated from HOT MAIN BAT BUS DC EMER BUS is isolated from HOT EMER BAT BUS

30
Q

BTC

A

Allows BPCU to control BTC operation. Ext power, hotel mode or single gen operation, BTC is closed (green flow bar)

31
Q

BTC - ISOL

A

BTC and BTR opened (released

out)

32
Q

DC BUS OFF

A

Respective bus not supplied.

ELEC on CAP

33
Q

EXT PWR - AVAIL

A

GPU has been checked by BPCU for over/under voltage, over current and polarity

34
Q

DC GEN 1 - FAULT

A

Generator FAULT Lt. Extinguishes above 61.5% NH if GEN is operating normally

35
Q

DC GEN 2 - FAULT

A

Protection trip by GCU;
Auto reset if underspeed: in other cases manual.
BTC auto closes

36
Q

DC SVCE/UTLY BUS

A
  • In automatic shedding
    One of the DC SVCE/UTLY 1 and 2 busses is shed 1 bus SHED (BCPU).
    ELEC on CAP.
  • In OFF
    All DC SVCE/UTLY 1 and 2 busses are shed DC SVCE supplies power in flight and on ground during airplane servicing operations.

UTLY BUSSES suplly nonessential loads

37
Q

ACW BUS OFF

A

Associated bus not supplied

38
Q

ACW GEN 1 /2 - FAULT

A

Auto reset in case of under/over speed: manual reset otherwise.

ACW SVCE BUS auto shed if 1 GEN is out

39
Q

ACW GEN 2 and ACW GEN 1

A

Min NP for ACW = 66 %.

The fuel governing mode maintains a MIN NP of 70.8% to be always above 66%.

The fuel governing mode is cancelled with the propeller feathered (No ACW).

FCOM (15 decks)

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