Interested to Buy Any Domain ? << Click Here >> for more details...
Why DC excitation is used for alternators? Why cant it be AC?
- 35 Answers
- 78429 Views
- ABB, Ace Info, Alstom, Shalivahana Power, I also Faced
- E-Mail Answers
Answer Posted / roy
AC itself produces alternating flux ,so If u gives AC to the
field coil the generator will give transformer action.there
is no need of rotating it.
In case if we rotate the field ,constant field will not be
produced.For every cycle of rotation ,there will continuous
change in the pole wrt 3 wdg of armature,result in irregular
waveform.we cannot get pure sinusoidal 3 phase supply.
so to overcome from above, dc excitation is given so that
constant field strength will be maintained.
| Is This Answer Correct ? | 0 Yes | 0 No |
Post New Answer View All Answers
Pls mail me utility & Dg related question with answer
what are the accessories need to be added while doing estimation for the following: 1.MCCB 2.MCB 3.ACB
brief notes on ammeters
why 1.7Uo for HV cable Hi pot test?IE standard why?
what is the formula of starting current of 3phase and 1 phase motor???
what is the k var ratting of 1250kva
State nyquist stability criterion.
What is expention fastener (Fan)
Dear All, I am new in construction company , my boss ask a question at time of interview , If we have 60MW generation and Single Power Transformer step-up we have. if CMR 50/60MVA , ONAN, ONAF respectively , is it sufficient or not ? for that much power to transfer,
What are the factors which influence the choice of specific magnetic and electric loadings of a synchronous machine?
what is the operating time for LBB and how does the LBB relay realise whether cb is opened or not?
What is the unit of charge and current?
I have motor of 3 H.P. How i found the rating of capacitor use in it in single phase motor..???
whether fibre optic cable in high voltage earth conductor is used for protection circuits
describe the phenomena of vacuum interruption in C.B
