Hermetic Type Transformers

They are produced in the power range of 25 – 5000 kVA, up to 36 kV high voltage level, three or single phase, oiled, with natural cooling (ONAN), with no-load tap changer or automatic under load tap changer, to be used both outside and inside. Hermetic oil-type distribution transformers are manufactured with the principles of balancing oil pressure and atmospheric pressure at the desired temperature by filling oil under vacuum, and preventing the cooling oil from coming into contact with the atmosphere.

In hermetic oil-type distribution transformers, the internal heat as a result of changing oil pressure due to thermal changes is controlled by the natural expansion and contraction of the boiler wave walls. It is mechanically designed and manufactured to withstand these effects.

Hermetic oil type distribution transformers have lower heights compared to transformers with expansion tanks. Therefore, it can be used in smaller areas.

Since the oil does not come into contact with the atmosphere in hermetic transformers, it does not require oil change at certain intervals as in transformers with expansion tanks.