now the supply for traction is 25KV AC.connected through
pantograf. this supply is given to an onload tap changing
transformer with a secondary voltage of 800v. this through
semiconductor devices converted and applied to traction
motor. the return path is the rails through brushes in the axils
25 KV single phase AC is fed from the feeding post which is
steped down by the transformer to about 600V required by DC
series motors but before feeding this voltage to DC motors
it is converted in to DC by rectifiers and filtered with
the help of choke filter.
The 25 KV single phase AC supply is applying to the step
down transformer by the feeding post line.The return path
of the current is track line.the track line is connected to
the proper earth for the safety purpose.The stepped down AC
supply is converted to the rectified DC supply by the
rectifier, filter circuit.now the DC supply is connected to
the DC series motor.DC series motor is very suitable for
startind high torque.
Train moves on 25kv single phase AC voltage supplied through
the catenary wire by pantograph on the roof of the train .
then it goes through converter inverter process where the
voltage is reduced and make suitable for the 3 phase
induction motors.and the track is connected is connected as
generally electrical train gets supply of 25kv dc from the
above wiring in the train .in train we convert the dc to ac
by using inverter then we use the electric supply and the
return path of current is the track of rail which is
an electric bulb is connected on a holder. one end of the wire
is connected to the phase and the remaining one connected to
earth instead of neutral. the bulb will glow or not? if yes
then what is the need of neutral?