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in ONAN type transformer winding temperature is lower than oil
temperature at evening time but morning winding temp is higher
than oil temp what is the reason?
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Answer Posted / raziq ulla
In ONAN type cooling,in the evening oil temperature is
accumulation of both atmospheric temperature of whole day
and winding temperature, so that temperature of the winding
In the evening is lower than oil temperature. At night due
to cool atmosphere continues till morning temperature of
the oil get down to its normal value and the volume of the
oil in a transformer is higher than the volume of the
winding so the heat generated by the winding is dissipated
by the system easily so that temperature of the winding is
higher than the oil temperature.
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