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Flashcards in Electrical Deck (27):
0

Ac system composed of

2 idg
1 apu gen
1 inverter
1 ram air turbine
1 ac external power unit

1

Dc system composed of

2 nicad batteries
3 tru's
1 dc external power unit

2

Idg's and apu gen are rated at

40 kva
115v ac
400 hz
3 phase

3

RAT POWERS

AC ESS BUSE WHEN AC 1 and 2 are not powered

Acmp 3A

4

What does the static inverter do

Converts. 28 v dc power from batteries to 115 v AC POWER TO SUPPLY THE standby AC bus when AC power source is unavailable

5

Rat is rated to

15 kva
115 v AC
400 hz
3 phase

6

RAT is deployed when AC power sources are not powering AC buses

It powers within

8 seconds

7

RAT DEPLOYMENT

The batteries power what during 8 sec deployment

Dc ESS bus and
Standby AC bus

Through static inverter

8

NBPT does what

Avoids electrical transient in case of power transfer on ground

Allows momentary paralleling between AC power sources

It will do this within milliseconds, if not successful it will transfer with a minimum power interruption

9

DC system composed of

3 TRU
2 Nicad batteries
Dc external power on ground

10

TRU rated to

300 amps

Primary source of DC. Power

Converts 115 v AC to 28v DC

11

If 1 TRU fails

Remaining tru's will power buses if DC bus tie switch is in auto

Respective bus is powered through DC electrical network through ETC and DCTC

12

TRU 1 powers


5

DC bus 1
DC ESS bus1
DC gnd svc bus
Hot batt bus 1
Charges batt 1

13

TRU 2 powers


4

DC bus 2
DC ESS bus 2
Hot batt bus 2
Charges batt 2

14

TRU Ess powers



1

DC ESS bus 3

15

What type of batteries

2 Nicad 24v 27 amp

16

Batteries will provide essential systems power for ___ minutes in electrical emergency. ( RAT failure)

10

17

When will Batt 1 (2) over temp trigger

70°c for min 2 seconds

18

Min batt 2 temp for apu start

-20°c

19

DC gpu provides power to apu start bus when plugged in, what normally powers it

Batt 2

20

When to use DC GPU

Batt unavailable
Batt 2 below -20°c

21

2 types of circuit breakers

Thermal
Electronic

22

CB Are located in

Cockpit walls

Icc thermal ( Mx reset only)

Electronic SPDA REMOTE( resettable through MCDU)

23

Elec power priority

Respective IDG
APU GEN
GPU on ground w/o APU
Opposite


Onside
Inside
Outside
Crosside

24

What components can be load shed

Galleys
Right windshield heat

25

Where are the batteries located

One is in battery compartment in nose and other is in rear fuselage behind pressure bulkhead

26

What are 4 things you get back on AC ESS bus when rat deploys

AC fuel pump 2
Hyd 3a
1 slat channel
1 flap channel