Answer / shyamkr

actually i don't understand what you actually want to ask in
this question...
there are any reasons because of which the excotor coil
fails in alternator
i)due to earth fault in excitor winding.
ii)due to short circuit of two or more turns.
iii)due to insufficient exciting current.
and some more...
i don't know whether i have given the thing you want in
this question or not........

Answer / satya prakash devagupthapu

the exciter coil of alternators fails due to
1)when the diode plate not properly work at the back of alternator which is connected to compound wound generator rotor.(the exciter field coil connections of alternator are connected to compound wound generator rotor).
2)and major reason is AVR failures also.

To avoid these failures of components maintain equal and correct load on each phase of the generator.
and avoid loose connections at the diode plate terminals.

Answer / pillay

thanks & sorry Shyamkr.It is suppose to be what are the
reasons 1} WHY the excitor coil of a alternator can fail.
2} How to prevent reoccurance.

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