General Electrical System Architecture on ATR aircraft.
The electrical power generation on ATR aircraft(upto 500 series at least) is provided by the following sources:
- Main and Emergency Batteries
- 2 engine-driven DC starter/generators
- 2 AC wild (ACW) frequency generaors
- 2 external power units (AC and DC)
In addition, 2 static inverters (supplied by DC system) provide CONSTANT frequency AC power.
The ACW electrical system can also supply DC electrical system through a Transformer Rectifier Unit (TRU).This available on 500 series onward but feature as an opton in some 400 and 300 series. ATRs.
The electrical distribution is ensured by electrical buses which feed the electrical equipment demanding. The Dc system has 11 busses!
Two separate networks (left and right side) run individually and can be connected in case of generation failure thanks to bus tie connectors (BTC)