Why DC excitation is used for alternators? Why cant it be AC?
- 35 Answers
- 69746 Views
- ABB, Ace Info, Alstom, Shalivahana Power, I also Faced
- E-Mail Answers
Answer Posted / ketan
when the rotor is rotating via a prime mover.. dc excitation
is given so that constant poles are generated on the rotor
and if ac excitation is given, the poles developed will be
alternating and hence the frequency of the current developed
will be much higher and hence, an ideal Rotating Magnetic
Field(RMF) wont be developed which is generated(for a
3-phase) iff dere's a 120* time phase difference n 120*
space phase diff. is dere. and also due to ac current
flowing dere will be an self induced emf as well
contributing to further losses.
| Is This Answer Correct ? | 7 Yes | 2 No |
Post New Answer View All Answers
What type of a DC motor would you use for a lift?
why we permissive overreach in distance protection.where it is applicable to use in long r short lines
What are the Return ( Monthly / quarterly/ Annual submitted to Electical Inspector for an establishment (Factory in Maharashtra-- Small scale category having seperate HT line of 22KV ) as per Maharashtra Electricity Act
What is the BS(British Standard)code for 11kv motor
What is center gravity load in substation?
bitumar
why electron produce magnetic field when it is in motion?
How generating electric power export to grid from the generating station ?
why i can not use thimble on capacitor duty contactor
Explain about technical and non technical losses in distribution system?
previous year paper of ntpc bhel for degree in electrical enng
Diagram on interconnectivity of 11kv transformer with RMU (i.e, one incoming and two outgoing or two incoming and one outgoing)
How halogen & merquery lamp works.
how can we select the appropriate VCB ?
how to calculate the battery AH
