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AAS 1 > AC Power Distribution > Flashcards

AC Power Distribution Flashcards

1
Q

The AC generators are connected to the what?

A

AC Busses

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2
Q

AC Generators (often called alternators) are used as the primary source of electrical power on what type of aircraft?

A

almost all transport category aircraft

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3
Q

Where DC is needed, what is used?

A

Rectifiers

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4
Q

For emergency situations some aircraft can utilize what?

A

APU or a Ram Air Turbine (RAT). Inverters can also be employed.

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5
Q

AC power can provide more what than a DC system?

A

power per weight of equipment

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6
Q

Most AC generators require what?

A

Constant Speed Drive (CSD) to maintain a constant frequency

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7
Q

The sole job of the CSD is to provide what?

A

constant 400Hz, regardless of throttle position.

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8
Q

Proper oil level is critical for what?

A

proper oil temperature

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9
Q

If a warning light comes on during flight, what should be done with the CSD?

A

disconnected immediately and inspected upon landing

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10
Q

Early generators were composed of what?

A

a generator unit and a CSD

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11
Q

The IDG contains both what?

A

the generator and the CSD in one unit

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12
Q

What generator is similar to the basic IDG?

A

The Variable Speed Constant Frequency (VSCF) generator

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13
Q

What happens to the RPM when dealing with the VSCF system?

A

The RPM of the drive and generator will change along with the engine.

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14
Q

How does the VSCF maintain a constant frequency?

A

Thru the use of solid state components

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15
Q

What does VSCF have located directly on the converter assembly?

A

BITE

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16
Q

The output of the typical AC generator is 115 AC. This is converted by what?

A

Transformer-Rectifier Units (TRU) where DC is needed

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17
Q

What is a TRU?

A

a step-down transformer and a full wave rectifier in one unit

18
Q

What is the TRU’s output?

A

28vdc

19
Q

What are two basic configurations used to distribute electrical power?

A

Split-buss system
Parallel system

20
Q

The split-buss electrical system contains what?

A

the completely isolated power generating systems

21
Q

When a generator fails, what happens to it?

A

the failed generator is isolated by the Generator Breaker (GB)

22
Q

What is one advantage of the Split-buss system?

A

that each generator operates independently

23
Q

Split-buss systems are more tolerant of what?

A

Frequency Variance

24
Q

Parallel systems require what?

A

strict operating limits

25
Q

What power distribution system has all AC generators connected to one distribution buss and maintains equal load sharing among all the generators?

A

Parallel

26
Q

In a Parallel system, should a generator fail, what happens to the failed unit?

A

The failed unit is isolated from the bus by the GB and flight continues using the remaining two generators to supply power.

27
Q

What are all generators synchronized and connected by?

A

The Tie Busses

28
Q

The busses are often referred to as what?

A

Synchronizing tie busses

29
Q

When closed, what does the Split System Breaker (SSB) do?

A

connects all generators together (paralleling the system)

30
Q

On modern aircraft with a parallel or split-parallel buss system, what is essential?

A

a centralized means of controlling power distribution between individual load busses is essential

31
Q

The power manipulation that happens between individual load busses must take place in a fraction of a second. To achieve this need, modern aircraft employ a what?

A

A solid State Buss Power Control Unit (BPCU)

32
Q

What does the BPCU do?

A

Receives data from the Generator Control Units (GCU’s) and the various ties, busses, and breakers in the system.

They are essentially small computers for a specific purpose.

33
Q

What are GCU’s used for?

A

GCU’s are used for each engine to monitor and regulate the generators output

34
Q

If a GCU detects a malfunction it will inform what?

A

The BPCU
Which will then ensure the appropriate power distribution system configuration

35
Q

What does the SSB control?

A

Controls power between all generators or parallels all the generators and is controlled by the BCU’s (BPCU’s)

36
Q

The BPCU also receives what?

A

Input information from load controllers which sense real system current and provide control signals for the CSD or VSCF

37
Q

If a system fault occurs, what does the BPCU do?

A

initiates the corrective action and records the fault in a non-volatile memory

38
Q

What is a No-Break Power Transfer (NBPT)?

A

an incorporated system that can automatically change the AC power source without a momentary interruption of power

39
Q

Synoptic pages cover what?

A

a variety of critical aircraft systems that are important for the pilot and also for the technician to help with troubleshooting

40
Q

What do Synoptic pages provide?

A

they provide the viewer real time status data of the system and of the major components in the system

AAS 1 (25 decks)

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