A330 electrical system Distribution - normal configuration AC distribution network
ELEC DC
• In normal configuration, each engine-driven generator supplies its associated AC BUS. • The AC ESS BUS is normally supplied from AC BUS 1.
DC BAT BAT 1 25 V 5A
DC 1
DC APU BAT 2 26 V 0A
DC ESS
APU BAT 25 V 5A DC 2
STAT INV
DC distribution network • In normal configuration, normal DC systems are split into two networks : DC BUS 1 in parallel with DC BAT BUS and DC BUS 2.
TR 1 28 V 50 A
ESS TR 28 V 50 A
TR 2 28 V 50 A
APU TR 25 V 100 A
AC1
AC1
AC2
AC2
• Each DC network is supplied by its own TR. • More specifically, ESS TR systematically feeds DC ESS BUS, which allows a better segregation between DC 1 and DC 2. • Two batteries are connected to the DC BAT BUS via the Battery Charge Limiter (BCL). • Each battery has its own HOT BUS bar (engine/APU fire squib, ADIRS, CIDS, PRIM and SEC computers, slide warnings, parking brake, etc). • The third battery is dedicated to APU starting.
STL 472.755/92 Issue 4
3.3