Dry Type Drive Isolation Transformer too hot? 5

[sparkview]

Dear all,

In a recent '2x500kW Battery Energy Storage project', we have been advised by the manufacturer to install two (2) 'Three Phase Dry Type Drive Isolation Transformer' of which nameplate can be seen below. The project is now commissioned, however, since a few days ago the Transformer is found to be extremely hot.

A thermal imaging camera shows that at the upper core of the Transformer, is at 182 degrees Celsius while the ambient temperature is about 30 degrees Celsius.
Both Transformers also release a smell of "burnt electronics". Can these Transformers be overheating? No hot spots can be observed directly and they only work for about 4-5 hours per day while the batteries are charging/discharging.

In advance many thanks for your support.

With kind regards,

Jairo Vrolijk

 

[prc]

In case of solar inverters also, the transformer Y neutral is not grounded. But according to electricuwe, the grounding will add harmonic currents. But my understanding is harmonic currents will not heat up core but only windings. But voltage harmonics or increased V/f can heat the core.