Oil-type hermetic transformers are normally produced with a closed tank equipped with fins that allow expansion during temperature changes. The tightness of the tank is up to 0.5 Bar. This type of transformer is the most used transformer type in the world. In hermetically insulated transformer, oil does not come into contact with air and its electrical properties are not compromised, extending the life of the transformer. At powers exceeding 3150kVA or in a transformer with a radiator, the transformer can still be hermetically sealed by means of a nitrogen pad.
For such transformers, the expansion of the insulating fluid is compensated by the elastic deformation of the oil cooling radiators attached to the tank. Protection against internal faults is provided by a DGPT device: Detection of Gas, Internal Overpressure and Oil Overtemperature.
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They are produced in the power range of 10-3.150 kVA, up to 36 kV high voltage level, three- or single-phase, oil-lubricated, ONAN, ONAF cooled, with no-load tap changer or automatic under-load tap changer, for both external and internal use
Free breathing transformers are equipped with an under-cover airbag or a casing to allow the oil to expand during temperature changes. Because it is not hermetic, the oil is always in contact with the air.
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