INPUT             3 PHASE 50 Hz 4 WIRE ( Voltage to be specified ).

OUTPUT         3V D.C. ( Minimum ) @ 5000 AMPS ( Maximum )

                        Output Volts and Amps to be specified.

RATING         200 KW ( Maximum continuous rating )

% RIPPLE      1.04 % Approx.

COOLING      Naturally air cooled.

TRANSFORMER IRON CORE Constructed from a five limb iron core design, to give a high zero phase sequence reactance, with the three centre limbs used for mounting the coils. Core material UNISIL 35M6.

TRANSFORMER WINDINGS Coils are concentrically wound with NOMEX covered copper strip, between the input and output windings is a copper earthed screen, all coils are insulated with class "F" insulation and varnish vacuum impregnated.

INPUT WINDING ( Mains voltage ) 3 PHASE 50 Hz STAR 4 WIRE

OUTPUT 1 ( 4.3 Volts A.C. minimum ) 3 PHASE 50 Hz STAR 4 WIRE

OUTPUT 2 ( 4.3 Volts A.C. minimum ) 3 PHASE 50 Hz DELTA 3 WIRE

Voltages and ratings to suit specified K.W. output.

RECTIFIERS Each output from the transformer is connected in series with a naturally air cooled three phase silicon bridge rectifier, which in turn are connected in parallel, to give a 12 pulse D.C. supply.

CONTROL Coarse control via three phase stepless variable transformer feeding the input to the main transformer. Fine control via three phase stepless variable transformer feeding a 10:1 ratio three phase Booster transformer in series with the input lines to the main transformer.