Answer / iamdon

This is due to residual magnetism in the core which is
inherenly present.

Author:arbelectbit@yahoo.com

Answer / avd

I am not agree with you people. Residual magnetism can not
produce any emf. You need a variable flux or rotating
conductor to produce emf, which is not the case.
There will not be any voltage in sec winding if primary is
kept open.

Answer / shyam

bcoz even if the hv(secondary side) is opend there will be
a small amount of flux flows through the core of the
transformer

Answer / thuranga

we can find voltage on lv side even when we remove hv
side,is because of its residual flux present in the
core......and this can happen only if there is no perfect
grounding to the transformer.
even though the grounding is not present, the voltage appear
for only a short time,as that voltage will get consumed by
the inductance and capacitance on the LV side of the
transformer.

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