Which of the following methods is used to control speed of 25 kV, 50 Hz single phase traction ?
Correct answer: B. Tap changing control of transformer
- A. Reduced current method
- B. Tap changing control of transformer
- C. Series parallel operation of motors
- D. All of the above
Explanation
A 25 kV, 50 Hz single-phase traction system controls locomotive speed mainly by changing the transformer tap, which varies the voltage supplied to the traction motors. Series-parallel control is associated mainly with DC traction systems.
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