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B300 Course > 24 Electrical Power > Flashcards

24 Electrical Power Flashcards

1
Q

Describe the B300 electrical system.

A

28 Volt DC, single loop, triple fed bus with a negative ground.

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2
Q

What components provide your electrical needs?

A

2 - 28v 300amp Starter gens, 24 volt nicad or 24 volt lead acid.

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3
Q

What are the 5 primary buses?

A

hot battery bus, center bus, triple-fed bus, left and right generator buses.

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4
Q

Termed a triple fed bus because?

A

Being fed by 3 primary power sources.

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5
Q

Describe the AC electrical system.

A

115 VAC & 26 VAC, single phase, 400Hz system, consisting of 2 static inverters, 2 bus transfer relays, ac power monitor circuit, CB’s and annunciators.

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6
Q

During simultaneous operation what happens to the inverters?

A

They are synchronised.

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7
Q

Power sources for the inverters?

A

1 - center bus, 2 right gen bus

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8
Q

The bus transfer relays located in the fuel control panel provide what purpose for the AC system?

A

Manually transfer AC equipment draw from one inverter to the other.

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9
Q

What is the function of the AC power monitor PCB

A

Monitors both 115/26 VAC buses, both switches and provides power to your #1/2 AC BUS anunciators, closes the sync line

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10
Q

Voltage and frequency regulation?

A

Voltage - +5% to -7%, freq 400 +/-1%

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11
Q

If a inverter switch is placed to the TRANSFER mode all its load is directed where?

A

It is shut down and load is transferred to the opposite inverter?

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12
Q

What is the optional AC elec system?

A

230 VAC 50Hz

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13
Q

What is the purpose of the AC Power Controller?

A

Distribute to AC power outlets, a RED diag led on the controller indicates a fault.

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14
Q

The DC generation and control system consists of?

A

2 dual purpose 28 volt, 300 ampere starter gen units for starting and electrical generation.

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15
Q

What would happen if excessive torque is applied at the starter gen spline?

A

it would shear.

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16
Q

Explain the winding used of the generators.

A

Series starter winding is used for starting, shunt field winding is used for generation.

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17
Q

Where is the GENERATOR CONTROL PANEL located and what is its purpose?

A

Main power distribution panel, line contactor relay control, voltage regulation, generator parralelling , differential voltage sensing, reverse current sensing , overvoltage, over excitation, cross starting

18
Q

Line contactor relay of starter gen system?

A

each starter gen is connected to its bus by a line contactor relay. the generator control panel will cut power at this relay when a fault is evident.

19
Q

Starter Gen paralleling

A

Maintains startgens electrical loads within 10% of each other, by measuring interpole winding voltages

20
Q

Overexcitation protection

A

The affected starter gen will be de-energized if generator bus voltage exceeds 28.25 VDC and output differential is greater than 15% for 5 seconds.

21
Q

Overexcitation protection

A

The affected starter gen will be de-energized if generator bus voltage exceeds 28.25 VDC and output differential is greater than 15% for 5 seconds.

22
Q

Reverse current and polarity protection.

A

If a starter generator is under performing or becoming a load of the system the GCP will open the line contactor relay and remove the affected starter gen from the circuit.

23
Q

Over voltage protection

A

If a starter gen exceeds 32.5 VDC, an inverse time delay will trip an internal field de-energizing the affected starter gen. Requiring a manual reset.

24
Q

What happens if voltage exceeds 40 VDC from a starter generator?

A

A completly seperate circuit will open the line contactor relay to immediately disconnect the starter gen.

25
Q

Cross start overload current limiting for starter generators?

A

limits the output current from the starter gen being used for cross starts

26
Q

Generator control relay for starter gens?

A

Located on the main power distribution panel near the generator control panel used for energizing respective contacts in regards to your ON or STARTER ONLY switch.

27
Q

Generator bus tie and bus sense switches.

A

pilots outboard sub panel, Analyzes bus voltages and automatically close the generator bus tie relays when no fault exists, bus -sense simulates and overcurrent in the TEST position.

28
Q

Bus Tie Relays

A

3 bus tie relays to connect to your battery, left gen and right gen bus ties, located on the aft power distribution panel, battery power distribution panel.

29
Q

What is the purpose of the 2x DC-DC Converter Power Supply?

A

Converts to a dual 24 VDC output to power your PFD, MFD, Attitude Heading Computer 1 & 2, During engine start.

30
Q

What 2 batteries can be used on the aircraft?

A

Nickel Cadmium (24VDC 36 amph) and Lead-Acid (Recombinant gas 24VDC 42amph)

31
Q

What charging methods are available for Lead Acid Batteries

A

Constant potential, constant current

32
Q

What charging methods are available for Ni-Cad Batteries

A

Constant Voltage, constant current

33
Q

How would you charge the batteries still fitted to the aircraft?

A

Via an external power source at 1/2 of the capacity rate.

34
Q

How would you charge the batteries still fitted to the aircraft?

A

Via an external power source at 1/2 of the capacity rate.

35
Q

What buses are used to form the single loop triple fed system?

A

L & R Generator busses and battery bus.

36
Q

What are the positions of your battery bus and generator busses?

A

Battery bus = cockpit fuel control panel, generator busses = aft of the engine firewall, center bus = forward center aisle floor

37
Q

Where does your avionics power distribution come from?

A

co pilots circuit breaker panel.

38
Q

Where is the main power distribution panel located?

A

Centre aisle floorboard in-between emergency exits.

39
Q

What may be used to power the primary buses during ground operations?

A

GPU

40
Q

What is the triple fed system protected by?

A

Current limiters and bus-tie relays

41
Q

The battery bus and generator buses are all tied together by?

A

The center bus

B300 Course (37 decks)

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