Answer / md. zakir hosen

We know that,The air gap controls the amount of magnetic
field produced for a given current. In the equation
∫H·dL = n i , H is quite small in the iron because of its
high permeability. Nearly all of the integral accumulates in
the air gap even though the gap is very small compared to
the part of the closed path length in the iron. It reduces
the tendency of the iron to saturate to avoid harmonics in
the current.

thanking u
http://a2zengineering.blogspot.com/
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Answer / arockia doss.a

Actually the airgap in transformer is for transfer the
primary power to the secondary. Means the primary winding
input voltage level will be step up/down(Depends on type of
trf.) to the secondary winding.

This is exactly same with wats happening in a 3 phase ind.
motor between stator & Rotor.

Thats why we are calling ind. motor as "Rotating Trf".

Thanks ....

Answer / rakesh patel

It limits the short circuit current of the transformer and it also control the Saturation of the core.

Answer / engr. kashif

None of the above answers gives a satisfactory explanation.....some1 plz elaborate it....Thanks.

Answer / nain

hi
air gap depend upon the applied voltage / range of voltage
in that gap.if it is not sufficient gap then breakdown of
the voltage will occur.

Why the field rheostat is adjusted such that the voltmeter reads 380V

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