Answer Posted / shyabi
As we all know Magnetic flux (Fi) is proportional to V/f ,
Where V is the applied voltage and f is the system
frequency. Whenever V increases or f reduces due to faults
or addition or removal of load (higher) changes magnetic
flux density of the transformer tending to increase. Also
fi= BxA,where B= Magnetic flux density, and A= area of
cross section, then as fi increases the transformer will
not have sufficient area to accomodate the excess peak flux
created by the scenarios like overvoltage or underfrequency
operation of the transformer. Then the transformer get rid
of the linear operating region ( Further increase in
voltage will not make any change at output). Hysterisis or
core loss will be higher during this period. Hence the
efficiency of the transformer reaches very low.
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