A 320 Electrical Limitation

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Limitations The Airbus A320 electrical power system consists of a three-phase 115/200-volt 400-hertz constant frequency AC system and a 28-volt DC system. Each of the aircraft’s three generators can supply the whole network. The system follows a powering priority system of; Engine Generators (IDG), External Power, APU, Emergency Generator (RAT), and then Batteries. In normal configurations two transformer rectifiers convert AC power into DC power. The airbus also has two Integrated Drive generator (IDG), which are driven by each engine. As long as each engine IDG is available then the two sides remain electrically isolated. The limitations for the IDG are: the IDG should not be disconnected when engine not turning (operation or wind milling) and the IDG disconnect should not be pressed more than 3 seconds. The IDG can only be reconnected on the ground. The a320’s two batteries have an automatic cut-off to prevent complete battery discharge when the aircraft is not powered or the airplane is on the ground. The limitation for this is that the batteries will shut off at 25% capacity to ensure APU start after an overnight. The min battery voltage is 25.5v and BAT voltage should be checked with BAT switch OFF. Battery require a 20 minute charge if BAT voltage below 25.5v. Max continuous load per generator 100% (90Kva). Max continuous load per TR (continuous) 200 A. Electrical Outlet use is prohibited during takeoff and landing. Emergency Generator produces 5 kva of power. Source A319 320 321 Limitations. Web. 20 Apr. 2014.

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