Aircraft Electrical Power Distribution Systems
Currently, many aircraft systems rely on hydraulic, pneumatic, and other mechanical forms of systems, though this trend is currently changing as newer technological capabilities progress. With the advancing technologies and benefits of the aircraft electrical system, aircraft design is shifting to favor electronic equipment over traditional mechanical systems. Aircraft electrical systems can save an aircraft weight and reduce expenditures across various segments, making them desirable. The aircraft electrical system operates to generate and distribute power throughout an aircraft, providing power for various systems, instruments, and components. Electronic equipment and systems may feature AC or DC power, and understanding these types and their functionalities can help one in designing aircraft and their electrical systems.
Functionality Of Aircraft electrical power system
Alternating current (AC) electrical systems are very common on multi-engined turbine powered aircraft. Alternating current is a type of electric current that reverses direction regularly. AC power is used for many types of equipment, including appliances and systems plugged into wall sockets or aircraft seat plugs. The typical generator for AC power distribution operates at 400Hz and is three-phase. 400Hz outputs serve as the standard for aircraft and aerospace applications due the ability to use compact, lightweight generators. Although higher frequencies for large distance powering may cause voltage drops, the ability to reduce the weight of an aircraft is a critical benefit that makes them worthwhile for use over other types. An alternator is a type of AC device which may be present on an aircraft to power the battery and act as a starter.
Unlike the reversing direction of alternating currents, direct current (DC) power flows in a single direction. DC power flows through conductors well, such as a cable wire for aircraft electrical system components, as well as through semiconductors and insulators. DC power is often seen on both smaller planes, as well as larger airliners which may use DC and AC power. Applications that DC power serves include electronic circuits, automotive batteries, telecommunication, and high-voltage power transmission. DC power may be used for powering and signal applications, and DC power is typically 28VDC when used for powering aircraft components.