With the avantages of being compact in structure,simple in operation,convenient in maintanance and low in application cost,the series are new necessary products used in power mining enterprises,especially when their oil are used in electric equipments,such as transformer,mutual inductor and switch. The purifier can remove free water,free air and particulate contamination,and can make the filtered oil reach or be closed to the standard of the new oil.The product could also be operated together with BJ series to treat aging and waste oil,so it is assistant without doult.