Special design ZYD-300 double-stage vacuum insulating oil purification plant can quickly remove water, trace water, gas, particles as well as acetylene, hydrogen, methane and other harmful ingredients from oil effectively to improve oil’s dielectric strength, effectively making sure electric equipments working safely and normally. Series ZYDvacuum insulating oil purification plant is particularly suitable for treating high-grade transformer oil, super-voltage transformer oil and new transformer oil. It can be used for filtration of more than 110V substation live line work onsite. Meanwhile, Series ZYD vacuum insulating oil purification plant can be used as independent vacuum source with functions of vacuum drying and vacuum oiling.