With double-stage vacuum system, two vacuum separating chambers and molecule adsorption technology, this double-stage vacuum transformer oil purifier can increase the purification effectiveness more than three times and efficiently and completely dewater, degas, remove particles to get higher dielectric strength and optimize performance of the oils. Features : 1.Adopting double-stage vacuum system to highly improve working vacuum value. 2.Two vacuum separating chambers with efficient oil atomizing device to increase separating size and separating time and ensure the drying degree and improve dielectric strength which is higher than 70 kv. 3.A suitable purifier for on-line oil purification of substations over 110 kv. 4.Deeply purifying high-grade transformer oil and ultrahigh voltage transformer oil. 5.Independent function of vacuum oil filling and drying. 6. Duplex stereo flash evaporation technology 7.Multi-stage precision purification system; mesh filtration combined with molecule adsorption technology. 8.Efficient heating system to make heating uniformity and decrease power consumption. 9.Double-infrared liquid level controller 10.Interlocked protective system to connect oil pump, heater and liquid level controller. If there has any fault, the purifier will be power off automatically.