To test Transformer we give HT side 440V to see wheather that it is producing

To test Transformer we give HT side 440V to see wheather
that it is producing 17.6V on LT to verify Voltage ratio is
correct or not but when we give the 440V voltage to LT side
then what will happen to HT voltage ?

Question Posted / venkatesh

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To test Transformer we give HT side 440V to see wheather that it is producing 17.6V on LT to verif..

Answer / manohar mishra

For ratio test, only the change in voltage is to be measureD. If 440 V is fed to LV, HV voltage will go to a HIGH VALUE (11kV) making it difficult to measure. Blowing of fuses do not occur as there is no flow of current.

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To test Transformer we give HT side 440V to see wheather that it is producing 17.6V on LT to verif..

Answer / nithi

For ratio-test,the second answer may be correct.
But at the same time,if we apply high voltage in LV
side (in ratio-test also)for a longer period (in seconds),
LV winding cannot withstand, result in insulation break-
down,blown-out of fuses.
generally ratio-test is conducted with the
specified (allowable) voltage magnitude.so,practically this
much of voltage is not applied for LV side.I hope,this
answer will be correct.

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To test Transformer we give HT side 440V to see wheather that it is producing 17.6V on LT to verif..

Answer / nithi

Nothing will happen.Simply,fuse will blown-off.

REASON: LV windings normally have low resistance (fatty
winding) compared to HV side.so, at the moment of
application of high voltage the fuse will sacrifice itself
to pretect the transformer LV windings.

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