R  The GCU 1 or GCU 2 enables closure of the BTC 1 or BTC 2 if no 
R R R R R R R  overcurrent condition and no "GLC welded" failure occurred (Ref: 24-22-00). The networks 1 and 2 are supplied in priority order: - by the corresponding generator, - by the ground power unit, - by the APU GEN, - or by the other generator. 
R R R R  NOTE : Locking of the two BTCs and isolation of the two channels is____ possible by action on the BUS TIE pushbutton switch; this control is located on the ELEC panel on the cockpit overhead panel. 
R  **ON A/C ALL
 (3) Distribution The alternating current distribution network comprises three independent parts. The network 1 mainly comprises the AC BUS 1, the AC ESS BUS and the AC SHED ESS BUS which are three-phase, 115 V/400 Hz busses. The AC BUS 1 supplies the essential busses in series. The AC BUS 1 and the AC ESS BUS also deliver 26 V/400 Hz power supply through their 115/26 V transformer. In the event of AC BUS 1 loss, AC ESS BUS and the AC SHED ESS BUS can be manually restored by the transfer of power supply directly from the AC BUS 2. It is possible to perform the transfer by action on the AC ESS FEED pushbutton switch on the ELEC panel, after illumination of the FAULT legend. In the event of AC BUS 1 and AC BUS 2 loss (emergency configuration), the AC ESS BUS and AC SHED ESS BUS are restored on the CSM/G when the RAT hydraulic power is available.
 **ON A/C 001-049, 051-099, 101-105, 201-203,
 When landing gear is extended, AC ESS BUS and AC STAT INV BUS are supplied by battery 1 via the static inverter. The network 2 includes the AC BUS 2 which is a three-phase, 115 V/400 Hz bus.
 It also delivers 26 V/400 Hz power supply through a 115/26 V transformer.
 NOTE : To carry out ground service operations (Ref. Para. C.), the____ external power receptacle provides independent and direct supply to a part of the network 2.

R **ON A/C 106-149, 151-199, 204-299, 301-399, 401-499,
 During RAT deployment or when the following two conditions are both met:
 -main landing gear compressed,

 -and A/C speed below 100 Knots,
 AC ESS BUS and AC STAT INV BUS are supplied by battery 1 via the
 static inverter.
 The network 2 includes the AC BUS 2 which is a three-phase, 115
 VAC/400 Hz bus.
 It also delivers 26 VAC/400 Hz power supply through a 115/26 VAC
 transformer.

 NOTE : To carry out ground service operations (Ref. Para. C.), the
____ external power receptacle provides independent and direct supply to a part of the network 2.
 **ON A/C ALL
 B. DC Generation and Distribution
 (Ref. Fig. 005)
 (1) DC Power Sources
 The power sources of direct current are:

 -three identical transformer rectifiers and two identical batteries.
 In normal configuration, the two normal TRs (TR 1 and TR 2) and
 possibly the batteries supply direct current.
 In the event of loss of one or both TR, part of the DC network is
 transferred to the ESS TR.

 (a) TR Each TR transforms the three-phase alternating current into direct current (28VDC).
 1 TR1 and TR2
_ Upon energization, the two normal TRs operate and supply the DC network via a contactor controlled by the internal TR logic. In case of failure, the TR sends a FAULT signal to the CFDS for maintenance purposes.
 2 Essential TR
_ Upon energization, the essential TR operates and supplies the DC network via a contactor.

 DC Generation and Distribution - Schematic Figure 005
 1EFF : 1 1R 1CES  ALL  1 11 1 24-00-00 Page 29 Aug 01/05

 To reset the TR push the TR RST pushbutton switch 15PU located on the relay box 103VU.In addition,the TR sends its electrical parameters to the lower ECAM display unit. In addition, the TR sends its electrical parameters to the lower ECAM display unit.
 (b) Batteries Each of the two batteries has a nominal 23 AH capacity and a 24 VDC voltage. The main functions of the batteries are:
 -
to start the APU in flight and on the ground,

 -
to supply the essential network in some configurations. A BCL controls each battery contactor when the BAT pushbutton switch is in the AUTO configuration. In addition, each BCL includes a BITE and a self monitoring system which analyzes internal and peripherical fault information. Initiation of the test is possible via the CFDS or at each power up on ground. Each BCL delivers electrical parameters and warnings concerning each battery to the lower ECAM display unit.

 (2) Distribution The direct current distribution network is divided into two parts. The network 1 comprises the DC BUS 1, the DC BAT BUS, the DC ESS BUS and the DC SHED ESS BUS. The TR 1 supplies the network 1. The network 2 comprises the DC BUS 2. The TR 2 supplies the network
　
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