Electric Traction | State the function of following equipment in power circuit of AC locomotive: (A) Tap changer (B) Traction Transformer (C) Circuit breaker (D) Smoothing reactor

(A) Functions of Tap Changer: Used to control the voltage to the traction motors through the rectifier for speed control.

(B) Functions of Traction Transformer: Steps down the voltage to the suitable value for the traction motor. It has a ratio of 20:1.

(C) Functions of Circuit Breaker: Disconnects the locomotive equipment from the supply in the event of fault in the equipment / loco.

(D) Functions of Smoothing Reactor: Smoothen out the ripples in the DC output current of rectifier.