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COAS 2022 > 24 Electrical > Flashcards

24 Electrical Flashcards

1
Q

What voltage does the DC system operate to?

A

28V DC

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2
Q

What does the GALY and CAB pb control?

A

Power to the main and secondary galley

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3
Q

What frequency does the AC system operate to?

A

400Hz

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4
Q

What voltage does the AC system operate to?

A

115/200V AC

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5
Q

How much power is generated by the generators?

A

90 KVA

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6
Q

What does the commercial pb control?

A

Commercial electric loads:
- Cabin and cargo lights
- Water and toilet system
- Drain mast ice protection
- Galleys

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7
Q

What does the GEN 1 LINE pb do?

A

Isolates GEN 1 from AC BUS 1

The number 1 fuel pumps in both inner tanks are now connected directly to GEN 1 (normally to AC BUS 1)

Used for smoke drill, sourcing smoke

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8
Q

When are the main galleys shed?

A

When only one generator is operating in flight
(or on the ground when the aircraft is being supplied by 1 engine generator only)

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9
Q

After the loss of AC BUS 1 and 2, how long does it take for RAT extension and emergency generator coupling?

A

8 seconds

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10
Q

What restrictions are there on the operation of the red guarded IDG pb?

A

Do not press for more than 3 seconds as it may damage the disconnect mechanism. The IDG should only be disconnected on a running or windmilling engine.

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11
Q

What happens if AC BUS 1 and 2 are lost simultaneously?

A

Emergency Electrical Configuration

If the aircraft speed is over 100 knots:
- RAT extends
- Emer gen driven by blue hydraulic system
- Emer gen connects to electrical network once operational (within tolerances)

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12
Q

What is the AC ESS FEED pb used for?

A

If AC BUS 1 is lost, then the AC ESS and DC ESS (via TR1) are also lost. AC ESS FEED allows AC BUS 2 to power the AC ESS BUS, and subsequently DC ESS BUS via the ESS TR.

The AC E

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13
Q

Which screens are lost in an AC BUS 2 FAULT?

A

FO PFD, ND and SD (Lower DU)

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14
Q

Which screens are lost in EMER ELEC?

A

FO PFD, ND and SD (Lower DU)

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15
Q

What is the normal configuration of the electrical system?

A

GEN 1 supplies AC BUS 1, which supplies AC ESS BUS and TR 1. This supplies DC BUS 1 , which supplies DC BAT BUS and DC ESS BUS.

GEN 2 supplies AC BUS 2, which supplies TR 2. This supplies DC BUS 2.

The two batteries are connected to the DC BAT BUS, and will be disconnected by the BCL when fully charged.

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16
Q

What is the reconfiguration of the electrical system in an AC BUS 1 fault?

A

AC BUS 1 is no longer supplied, which leaves the AC ESS BUS, TR 1, and subsequently DC BUS 1, DC BAT BUS, and DC ESS BUS without power.

In this situation, the AC ESS FEED pb can be pressed, to supply AC ESS BUS from AC BUS 2. AC ESS BUS then supplies the ESS TR, which supplies the DC ESS BUS.

DC BUS 2 supplies DC BUS 1 and DC BAT BUS automatically after 5 seconds

17
Q

What is the reconfiguration of the electrical system in a single TR fault?

A

The ESS TR automatically replaces the faulty one through the AC ESS BUS, and powers the DC ESS BUS. DC BUS 2 powers the DC BAT BUS and DC BUS 1 (in a TR1 fault)

18
Q

What is the reconfiguration of the electrical system in a double TR fault?

A

The ESS TR powers the DC ESS BUS from the AC ESS BUS. As both TRs are lost; DC BUS 1, DC BUS 2, and the DC BAT BUS are lost.

19
Q

What is the difference between emergency electrical configuration (loss of both generators) and the smoke configuration?

A

They are the same, except in the smoke configuration the number 1 fuel pumps in both inner tanks are connected upstream of the GEN 1 line connector (i.e. directly to GEN 1)

20
Q

What is the configuration of the electrical system in emergency electrical configuration in flight?

A

The EMER GEN (RAT, blue hydraulic system) supplies the AC ESS BUS, and the ESS TR. This supplies the DC ESS BUS.

21
Q

What is the configuration of the electrical system in emergency electrical configuration if the RAT stalls or on the ground below 100 kts?

A

The EMER GEN has nothing to drive it. The batteries supply the electrical system via the static inverter. AC SHED ESS BUS and DC SHED ESS BUS are lost.

22
Q

What happens below 50 kts on the ground in the emergency electrical configuration?

A

The AC ESS BUS is automatically shed, leading to the loss of all DUs.

23
Q

What is the output of the AC and DC systems?

A

AC - 90kva, 115/200V at 400Hz
DC - 28V

24
Q

Normal conditions, how does electrical system work?

A

2 IDGs power their respective AC busses.
AC1 powers AC essential bus.
Each AC bus powers a DC bus through a TR
DC bus 1 powers the DC Essential bus.
IDG1 therefore has approx 10% higher load

25
Q

What is the Bus Tie?

A

The bus tie allows power to be transferred between each side of the electrical system.
It allows the APU Gen to power both sides

26
Q

Abnormal conditions, how is the electrical system powered?

A

An emergency generator powered by a RAT supplies 5kva AC power to the AC Essential bus.
It also powers the DC Essential bus through the Essential TR (1kva output)

27
Q

When does emergency gen automatically deploy?

A

When AC bus 1+2 fail

28
Q

What happens in time between AC bus failure and Emergency generator taking over?

A

Rat deploys but takes approx 10s
Battery 1 powers AC Essential through Static Invertor
Battery 2 powers DC Essential bus

29
Q

QRH electrical procedures?

A

Emer elec systems remaining
Emer elec summary
CB Tripped

30
Q

3 occasions batteries connect to batt bus?

A

APU battery start
Flight on batteries only
Recharge cycle

31
Q

3 types of CB?

A

Monitored - green (ECAM after 1 min)
Unmonitored - black
Cannot be reset - red sleeved (WTB)

32
Q

AC Bus 1 fail?

A

AC Essential bus is powered by AC bus 2 via the AC Essential Feed (automatic)
AC Essential powers DC Essential through Essential TR
DC2 powers DC1 through DC Batt Bus

33
Q

Consequences of a TR 1+2 failure?

A

Lose DC 1+2

34
Q

Emer Elec Config?

A

Loss of AC1+2
Emergency generator powers AC Essential which powers DC Essential through Essential TR.
Only essential systems remain and CM1 has to be PF

35
Q

Emergency Smoke Config?

A

Similar to Emer Elec Config but initiated by pilots to isolate electrical smoke.
Differences:
1. Fuel pump stays on in each inner tank so gravity feed not required
2. Expected to return electrics to working condition before landing (reversible)

COAS 2022 (28 decks)

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