The structure of oil immersed distribution transformer

The oil immersed distribution transformer core is built up of cold rolled oriented grain steel sheet with low specific losses, insulated on both sides by a thin inorganic coating. Uniform pressing, stiffness and solidity of the columns assure a low noise level. the polemounted transformers are filled with mineral oil, according to IEC standards. The oil is previously treated and dried. Upon demand, filling can be made by using insulating silicon oil or vegetable and biodegradable.