trains run on ac or dc?? if ac or dc what are the advantages and disadvantages?

trains run on ac or dc??
if ac or dc what are the advantages and disadvantages?????

Question Posted / friend4u.friend4u

4 Answers
17236 Views
ABB, Infosys, I also Faced
E-Mail Answers

Answers were Sorted based on User's Feedback

trains run on ac or dc?? if ac or dc what are the advantages and disadvantages?????..

Answer / rocky

The overhead supply of the train is 25kv ac,single phase.
In earlier locomotives this ac supply was converted to dc
to run the DC Series Motor of locomotives.

But now a days, due to availability of IGBT converters &
speed controller drives, single phase induction motors are
being used. These single phase induction motors have better
efficiency and are more robust and maintenance free than
the DC Series motors, and so they are preferred choice for
locomotives these days

Is This Answer Correct ?

31 Yes

5 No

trains run on ac or dc?? if ac or dc what are the advantages and disadvantages?????..

Answer / rocky

In addition to this , in AC motors, the 25kv ac supply is
first converted to dc ant then again converted to ac to
have a better speed control as we cannot control speed with
50hz supply.

Is This Answer Correct ?

8 Yes

3 No

trains run on ac or dc?? if ac or dc what are the advantages and disadvantages?????..

Answer / ganesh.a

in india trains run on dc power and diesel,
trains can also be run in ac power.
eg: linear induction motor is used in high speed trains in
foreign countries which uses 3 phase ac power.
if ac
adv
no need of converter equipments
can be used for long distance with less cost
disadv
losses will be there
inductance, capacitance effect is there
more conductors needed
if dc
adv
losses wont be there
less no of conducters needed.
disadvan
it needs more cost for long distance
if there is a fault in on converter station
entire transmission will be affected.

Is This Answer Correct ?

3 Yes

0 No

trains run on ac or dc?? if ac or dc what are the advantages and disadvantages?????..

Answer / vinit92

the input given to the train in the form of dc
but alternator in train it will convert this 1500 v dc into 640 v ac . Siemens and X'Trapolis trains have 3 phase AC traction motors, best not to run them with DC.

Is This Answer Correct ?

6 Yes

9 No

Post New Answer

More Electronics Communications Interview Questions

Is the output power different from input power.? rated input voltage” Is that the voltage we give to the driver or the voltage which comes out from the driver?

0 Answers Garg Udyog,

Which gates are called as universal gate and what are its advantages?

0 Answers

which two layers of OSI perform error and flow control functions. how they are different

1 Answers

ripple factor of half bridge rectifier???

1 Answers ISRO,

what is race around condition

22 Answers National Youth Service, Samsung, TATA, Vodafone,

enlist, How many devices or components are use in circuits,PCB like power supply, UPS card, bus module card ,CP card?

1 Answers

What is sweep time?