Application The machine, which is suit to electrical apparatus manufacture factory, power station, power supply department, transformer in railroad station and other department, can filter insulation oil for transformer, mutual inductor, electricity capacitance and hi-pressure switch. The machine also can deal with vacuum filtering and dry the heating oil circulation for the large electrical apparatus. Features The machine is mainly applied to the transformer, which power is under 330KV. It can remove the water, gas and impurities in oil hi-efficiently. It also can remove the polarity material in the used oil and reduce the acid value so that improve the voltage value and quality of oil to make sure the security of electrical apparatus. Various systems in the machine can run at the same time. They also can be used separately. Their speed is fast, the quality is good and the operation is security and reliable.