Electrical Power

Aircraft use 3-Phase, 400Hz, 115VAC and 28VDC power. On this page we will learn a little about where it comes from and how its used.

AC Power

AC Power comes from the generators which mount on the accessory gear box of each engine (integrated drive), and the auxiliary power unit(constant speed).
DC Power

AC power is sent to the transformer rectifier units (TRUs) which then turns the AC into DC power and sends DC out for distribution.
Distribution

When the aircraft engines are online the generators supply AC voltage to distibution boxes. Power will then be distributed to the main and essential busses, as well as the TRUs which returns DC voltage for distribution.