ATR and General turboprop Electrical power design
From your question I take it you are not trained on ATR as Pilot or engineer?
As mentioned in the preceding threads,Turboprops (ATR included) primarily employ 28VDC electrical power.Most turboprops use DC generators, supplemented by one or more batteries to power equipment and services such as avionics, exterior lights, and motors, that draw a heavy electrical load. Some of the DC power is changed inverted to 28V , 400 Hz AC power for certain Avionic requirments, indicator synchronization functions,lighting, as well as general "hotel" services modes such as galley, toilet and cabin cleaning etc.
The heart of most DC systems is the battery.It provides electrical when Generators are not working..asuch as at pre flight(before GPU connection of engine 2 start in Hotel mode in the case of ATR) and during emergency operations.
The distribution of DC and AC power is divided into functional groups (gangs) referred to as "buses" which give priority to certain equipment during normal, abnormal, and emergency configurations.Distribution buses branch out from central locations, each protected by a circuit breaker. Main buses serve most of the aircraft's electrical demands. Essential busses feed power to equipment having top priority.
Last edited by Trackdiamond; 22nd Nov 2013 at 16:57.