ransformer is different from ordinary oil-immersed transformers due to thefact that it is provided without conservator. The fins on corrugated tank act as radiatoand can swell up or shrink to compensate the oil volume variation. Such kind of structrecan isolate the transformer oil from the atmosphere Protect the oil and the insulation against degradation, therefore, enhance the running reliability This type of transformers has been widely used for city grid upgrasing and in industrial and mining