can any one help me out with how ac electrisity is generated and distributed on an aircraft?

Question

thanks aircraft engenering student

Answer 1

There's an AC alternator on each engine, so when the engines are running they generate power which is brought in to a central switching system. From there is is routed to the places that need it. You want me to describe a switching system?

On some aircraft there may also be a ram air turbine (RAT) for emergency power generation and an APU for ground power where the airport doesn't provide it via cable.

Magnetos are only used for generating the ignition power on gas engines.

Most commercial aircraft systems work on 115v 400Hz with 28v DC and 26v AC being used for some small loads.

Answer 2

It's generated by generators installed on the engine(s). It's distributed the usual way -- with wires. Most aircraft electrical systems are either 120/208 volt, 400 Hz, 3 Ph, Y, AC or 28 volt DC.

Answer 3

The Embraer Legacy business jet has both DC and AC power. The DC power system supplies 28V DC for all electrical loads and recharges the batteries. The Legacy has two engines. Each engine drives two independent generators rated at 400 amps each. There is also an Auxilary Power Unit starter-generator (28V/400 amps). An 250 VA/400 Hz single-phase static inverter converts 28V DC into 115V AC for power outlets in the cockpit, galley and cabin. There are two 24V DC/44 Ah/1 hour Ni-Cad batteries, one 24V DC/5 Ah/10 hour lead-acid backup battery and an external power source.

The Electrical Distribution Logic and Generator Control Units perform system management. Detected system failures are automatically isolated, causing some bus(es) to be deenergized.

Under normal operation, the electrical DC system is divided into isolated left and right electrical networks. The left network includes the two generators (operated in parallel) driven by the left engine and are connected to DC bus 1 (left) to supply essential DC bus 1, shed bus 1 and hot bus 1. Battery 1 is charged by the generators connected to DC bus 1. The other two generators power the right network driven by the right engine.

Both networks are interconnected through bus tie contactors in case of operation with less than four generators. The APU generator may replace any inoperative generator, or may be used before engine starting and supply the electrical system through the central DC bus in between the left and right buses. Ground power may also supply the electrical system through the central bus.

The two Ni-Cad batteries can supply at least 40 minutes of power for essential loads in an all-generator-failure condition. Battery 2 (right network) provides power for APU start.

The APU generator, when operating, is connected in parallel with the generators supplying DC bus 2.

The engine driven generators come on line when engine speed stabilizes above 56.4% N2.

Primary electrical power for engine control and the ignition system is provided by a permanent magnet alternator that is driven by the engine accessory gearbox. Initially 28V DC is used until N2 is above 10% for ignition and 50% for FADECs (full authority digital electronic control) which controls fuel metering.

Answer 4

R T
The power distribution is as answered in several replies , but the reply from "Randle W" showed his Ignorance to other people .
If you have nothing to add to the question , and you showed how stupid you are , try reading the sunday funnies .You may need an interpretor to get their meaning,Jacka_ _ .
PS who would call their spawn Randle ?

Answer 5

If your ignorance of spelling is any indication of your overall academic talents, I hope to never fly in anything with which you have been associated.

Answer 6

Magnetos