if transformer winding burn on dc supply then
why not alternator rotor winding please post
answer on y.sakhare@rediffmail.com
Answers were Sorted based on User's Feedback
Answer / anil
there should be a relative motion to induce an emf i.e
either a rotating rotor field with dc or alternating supply
to the stationary core in case of transformer if we give
constant dc than there is a constant flux linking with the
secondary which will not produce any emf in secondary and
thus since there is no opposition to the primary emf and
the resistance of winding is very small this will lead to
high currents in primary and thus may lead to the burning
this is not in case of alternator since the rotor is
rotating
Is This Answer Correct ? | 12 Yes | 3 No |
Answer / yogesh
every conductor produces magnetic field around it when you give ac or dc supply.but in ac supply the flux is alternating which produces self induced emf in winding which opposes supply vtg so currunt limits.but in dc supply there is no self induced emf.so when dc supply given to xmer no self induced emf produced to limit the current and in alternator or dc motor there also no induced emf produced but to limit the current the winding resistance made high ie above 100 ohms wheres xmer wdg resistance is in points range ie 0.1 ohm etc
Is This Answer Correct ? | 8 Yes | 1 No |
Answer / antaratara ghosh
With reference to the ans#2, the impedance of the
transformer is mostly inductance whereas in sync m/c it is
resistive...so if we apply a dc voltage in trafo, there
will be no inductance and the total impedance becomes very
very small.. thus I=(E-V)/Z will be very high for
trafo...due to this high current trafo windings will burn
but not sync m/c....
Is This Answer Correct ? | 0 Yes | 2 No |
Answer / k.prakashchandra
The windings in both the cases will not burn out if the
cooling is perfect.When it comes to motors or gen, it is
advisable to specify whether field or armature instead of
just rotor or stator.In case of large HT gen, the field is
the rotor.When Dc is applied and current is =V/DC
resistance.The same with the Tr.At the rated DC current, the
heating in tr will be less as there are no iron losses.
Is This Answer Correct ? | 0 Yes | 10 No |
What is the major differences between RCCB & ELCB? If we use ELCB of less sensitivity why does it trip often and can we control it from tripping?
What is Residual Voltage & Residual Current?
If one d.g. is unable to take full load of system, then second d.g. will take care of partly Load.for this condition RPM of both DG set should be equal.By using Synchronization panel RPM of dg sets are match, is it true?
in ac system the current wave form becomes zero for every half cycle then how can we get continuous supply can any one answer to this plsss
WHY DISEL GENRATOR SET SHUT DOWN IN OVER LOAD CONDITIONS
why we use the 100% and 95% stator earth fault protection for the synchronus generator ?
0 Answers Operational Energy Group,
How to setting the volume of RTCC panel AVR (11kv) controller
0 Answers CNF Automotive India,
what is difference between mccb,mcb,elcb,pccb
what is rotary ups?
which is dangerous AC or DC? If so why?
In dc ckt. 24v or 110v, which one is more efficient and why?
Why USe In -48 DC Volt !