A320 Lounge Electrics 2

Question 1

How do you turn AC power into DC power?

Answer 1

Transformer Rectifiers

Question 2

How many TRs are there?

Answer 2

3.
TR1, TR2 and ESS TR

Question 3

What is the maximum output of the TR?

Answer 3

200A

Question 4

What does the TR normally put out in volts?

Answer 4

28V DC power

Question 5

What is the DC BAT BUS normally powered by?

Answer 5

DC1

Question 6

What is the HOT BAT BUS?

Answer 6

Some things are always connected to the battery, and always energised, such as the clock

Question 7

What is a BCL?

Answer 7

Battery Charge Limiter

Question 8

What does a BCL do?

Answer 8

Controls battery charging and discharging via a battery contactor. It closes the battery contactors when the voltage falls below 26.5V, to allow the batteries to charge.

It also connects batteries to DC BAT BUS when starting the APU, as the drain on the electrical system is high

Question 9

What is the DC ESS BUS normally connected to?

Answer 9

The DC BAT BUS

Question 9

What is connected by the battery contactors?

Answer 9

Battery to DC BAT BUS

Question 10

When ground power is connected, what is the maint bus connected to?

Answer 10

AC BUS 2 and DC BUS 2, using TR2

Question 11

If AC BUS 1 fails, how does DC1 get powered?

Answer 11

The DC TIE closes, and DC2 sends power through the DC BAT BUS to DC1.

This creates a big load on DC2, so the DC ESS BUS then gets powered by the AC ESS FEED closing, and power comes through the AC ESS BUS-ESS TR route

Question 12

If there is a failure of DC BUS 1, how is the DC ESS BUS and DC BAT BUS powered?

Answer 12

The DC TIE closes, and DC2 powers DC BAT BUS.

The ESS TR then provides power from the AC ESS BUS into the DC ESS BUS

Question 13

What happens when AC BUS 1 and AC BUS 2 fail?

Answer 13

There is no way to power DC1 or DC2 either.

RAT deployed

EMER ELEC CONFIG

Question 14

How long does it take for the RAT to deploy?

Answer 14

5 seconds to extend and a further 3 seconds to start generating blue hydraulic power

Question 15

What is a brief summary of the BUS use in EMER ELEC CONFIG?

Answer 15

Emergency generator powers AC ESS BUS and directly to the ESS TR, which powers the DC ESS BUS

Question 16

What happens if RAT fails in EMER ELEC CONFIG?

Answer 16

BAT 1 feeds a static invertor which powers AC ESS BUS, and sheds some stuff.

BAT 2 feeds the DC ESS BUS

Question 17

How long can you fly on battery only?

Answer 17

20-30mins

Question 18

What happens after landing in EMER ELEC CONFIG? Why?

Answer 18

Below 50kts, screens go blank, because the static invertor stops powering AC ESS BUS

Question 19

What is the order of priority of power?

Answer 19

Engine
External power
APU
EMER GEN
BAT

(Think GEARB for Generators, EXT, APU, RAT, BAT)

Question 20

What is the difference between the GEN1 pb and the GEN 1 LINE pb?

Answer 20

When using GEN 1 LINE, one fuel pump in each fuel tank remains connected to the electrical system

Question 21

As a rule of thumb, which busses are captain devices powered by?

Answer 21

ESS BUS

Question 22

As a rule of thumb, which busses are FO devices powered by?

Answer 22

No 2 BUS

Question 23

As a rule of thumb, which type of devices are powered by AC?

Answer 23

Visual devices

Question 24

As a rule of thumb, which type of devices are powered by DC?

Answer 24

Aural devices

Most computers

Question 25

Which screens are powered by which busses?

Answer 25

AC ESS provides Capt PFD, ND and E/WD

AC2 provides FO PFD, ND and SD (lower ECAM)

Question 26

Which busses power the MCDUs and FMGCs?

Answer 26

MDCU1 - AC ESS
MCDU2 - AC2
FMGC1 - DC ESS
FMGC2 - DC2

Question 27

Which busses power the RMPs and ACPs?

Answer 27

RMP1 - DC ESS
RMP2 - DC2
ACP1 - DC ESS
ACP2 - DC ESS

If the FO ACP was powered by DC2, FO wouldn’t be able to hear or talk, even to each other, in EMER ELEC