The purifier can deeply and quickly purify insulating oil of all kinds of electrical equipments, it's produced higher than national standard and can quickly remove water, gases, particles from contaminated/waste oil, improve dielectric strength, shorten period of oil treatment. This machine is widely used in all industries such as power plants, power stations, power companies, metallurgy, petrifaction, machinery, traffic, railways etc. Especially for on site transformer overhauling with 110 KV or over, drastically remove poisonous gases such as firedamp from new oil or imported oil. It's equipped with one special device for additives, which is easy to operate. The additives which put into the device are innocuous. The process of depolarization is a physical process and never destroys oil quality, the oil after recycling up to international standard.