For 600 V dc line for tramcars

For 600 V dc line for tramcars

Right Answer is:

The track is connected to negative of the supply

SOLUTION

  • We use 25kv ac supply which runs in overhead lines. Now pentagraph is the device that is used to give that supply to train. The overhead catenary wire acts as a positive supply.
  • The tracks below are earthed via each of the electric poles on the side of the tracks. The positive of the wire goes via resistor banks to the positive point on the motor.
  • The negative terminal of the motor is connected to the locomotive’s wheel assembly which passes the current to the earth via tracks i.e the rails acts as a return conductor(negative terminal).
  • Current flows only when the circuit is closed and there should be a potential difference and ground is neutral so it closes the circuit.
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