Auto Transformer(Oil & Dry Type)
Convetional type , three phase, 50Hz supply frequency , copper winding, double wound , "A" Class insulation, self cooled, oil immersed, ONAN (cooling), inddor/outdoor type, designed to ensure better cooling , low noise level , better impulse.
They need a cooling medium to prevent overheating and potentially causing a fire or explosion. The most significant distinction between the two transformers is their cooling medium. Dry-type transformers employ air as a cooling medium, while oil-filled ones, as the name suggests, use oil.