... oil purifying device, with its special feature of transformer on-load tap-changer, has the capacity to eliminate the following ... large transformers widely installed on-loading switches with frequent on-load switching can produce arcs which will lead to oil ... 50Hz380V/50HzRating flux(L/min)7,10,127,10,12Rating pressure(MPa)0.50.5inlet diameterDN15~DN20DN15~DN20outlet diameterDN15~DN20DN15~DN20filter ...