Answer / bhupesh

DC series motor, always!!
because of its high stating torque and speed control..
But now a days, like in Delhi metro squirrel cage induction
motor is used becoz of its compact design, less maintenance
and regenerative current system.
also some improvements are made for better speed control..

Answer / hemlata

Series wound dc motor due to it has low resistance field and armature winding (according to ohms low I=V/R) advantage high current magnetic field inside the motor strong,produce high torque (turning force)

Answer / himabindu

D.C. Series motor since it has a high starting torque

Answer / fulchand mahato

(a) →high starting torque.
(b)→better speed control.
(c)→low maitanance cost.

Answer / surender kumar

Series motors are widely being used in traction systems, due to good starting torque ,speed controlling quality.
In general terms series motors are starting on load and performing great in compare to rest motors.

Now induction motors are also being apply in traction with SCR it is recent development.

11 KV Power cable end earth connection insulation got burned wht is the reson pl give the resons

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An 11kv system consisting of an underground cable to a sub station about 300 meters away was shut down for about 10 hrs. On energising, it tripped off on earth fault about 10---20 mins later 6 times but since than it is not tripping.its already 3 weeks now. The SPAJ was found to be fine. what could be the cause.No test had been done to determine the cause of the trippings till now because of demand.

2 Answers