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to reduce heat which occur due current passing in the primary and secondary winding for transformer due to internal impedance and eddy currents
Usually A class of insulation is done on MV distribution transformers in which temperature must not exceed from65ºC as higher temperature may damage insulation resistance causing transformer failure.
any ventilation is used to be insure that the inner component of transformer or any machine get the heat out of it because the excessive heat can damage the transformer as it can melt the insulation
If dry type transformers self cooling limit exceeds (During more load) , air ventilation is must to maintain room temperature as good. Better should keep Max.5 deg C diff. between inlet and outlet room air temp.
in any electrical equipment ventilation is required as the losses in the equipment will be given out in form of heat.
All electrical installations need proper heat dissipation.
If this is dry transformer, generated heat is not supposed to be very high.
What type of ventilation is being used there, by the way?
If the ventilation is not by design, but needs extra ventilation. It is alarming.
It is really need to be diagnosed, and root cause has to be rectified.
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