what will be the effect if we increase the excitation of a alternator??

what will be the effect if we increase the excitation of a
alternator??

Question Posted / mkrishno

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what will be the effect if we increase the excitation of a alternator??..

Presuminng that the field excitation is increased,incresed excitation produces more flux and hence more current which the winding may not handle resulting in the production of exessive heat.As a result the the alternator may burn

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what will be the effect if we increase the excitation of a alternator??..

Answer / jakeer

The output voltage will be high & due to this over voltage
relay will trip the Alternator.

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what will be the effect if we increase the excitation of a alternator??..

Answer / raul

If the excitation of an alternator is increased, then the
excitation voltage will increase, more flux in the air gap,
more rotor heating. But the excitation increase is governed
by the ROTOR HEATING LIMIT as per the generator capability
curve which over-rides the STATOR HEATING LIMIT. Above the
RHL, the automatic voltage regulator (AVR) takes over
control and starts reducing the excitation by Rotor current
limiter which acts in conjunction with the AVR.

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