11.6 Flashcards by Connor Harry

How many IDGs are on each engine to generate AC current ?

1 per engine

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Whats used to turn AC into DC. ?

TRU

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What turns DC into AC ?

Static inverter

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What does an electrical power system consist of ?

-Generator which produces electrical energy

-Distribution subsystems providing electrical energy to consumers

(These are both slept into AC and DC )

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What supplies emergency supply to the essential consumers in an emergency ?

Essential bus

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Whats the use of a battery tray ?

To catch any corrosive electrolytes split from battery

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Whats thermal runaway ?

When the battery produces more heat then it is dissipating.

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How often does a battery have to be serviced ?

Every 2000 flight hours

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What will a battery cell rise to during charging ?

1.5v

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What will a battery cell drop to when it’s discharged ?

1.0v

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What battery is constant current method usually used on ?

Ni-Cd

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If battery’s are in parallel, does the current or voltage output go up ?

Current

( battery’s in series gives greater voltage output )

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What does the battery master switch connect when turned on ?

Both battery’s to Essential bus bars

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What does the main battery switch connect when turned on

MAIN battery to MAIN bus No.1

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When disconnecting battery, do you remove negative or positive lead first ?

Negative

( when re-applying you connect negative last )

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What battery is use do 787 ?

Lithium-ion battery

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How many cells are in a lithium-ion battery ?

8 cells

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Whats the advantages of lithium-ion battery’s over Ni-Cd ?

-Improved power quality
-recharges quick
-weight 30% less
-no memory degradation
-compact

What is a DC starter generator used for ?

Start engines

Whats load shedding ?

Reduce the electrical load to a acceptable level in the event of a system overload

How many phases does a AC electrical power system consist of ?

3 phase
( 400HZ )

Where do you get 200v from on the 3 phase AC electrical system ?

Between each phase
( get 115v between a phase and neutral )

How do you control the AC generators output ?

CPU

Is the speed of the generators output proportional to speed of rotor ?

Yes

Whats used to ensure that there is a constant output speed out of the generator ?

Constant speed drive

Where is the constant speed drive fitted ?

On engine with the generator

Whats the purpose for an oil circuit ?

To cool and lubricate the CSDU (constant speed drive unit )

Whats the two ways the CSD ( constant speed drive ) is monitored ?

Circuits alerting the crew automatically Indications displayed on the ECAM

When do you reset the CSD only ?

On the GROUND

What is the IDG speed ?

12,000 RPM

What does the GCU control ?

Varys the voltage and frequency of the CSGU

Whats the three basic forms of AC generation systems ?

Non - parallel Parallel Frequency wild

What does a current transformer do ?

Allows you to read a circuits current without breaking the system. ( has three pick coils which picks up magnetic fields )

How many degrees apart are the three phases on a AC system ?

120 degrees

Whats used to regulate the voltage ?

GCU

Whats the purpose of a busbar ?

Distribute electrical power

Whats a transformer used for ?

Transform voltages up or down

Whats the two circuit protective devices ?

Fuses Circuit breakers

What are fuses and circuit breakers used to prevent ?

Current that flow higher than the maximum allowed ( overload ) or a short circuit

What is used to check a fuse to ensure it hasn’t blown ?

Multimeter

How many times can you reset a circuit breaker ?

Once

How do you know a circuit breaker is tripped ?

White collar will show

Explain a virtual circuit breakers ?

Monitored on a computer

How many pins does a DC gpu connector have ?