This product conform to the state standards GBI094 " Power transformer" and CB /T6451 the three-phase oil-immersed power transformer technical parameters and requirements" .This product scope of on-load changer for 30 ± 4 x 2.5%kV; 35 ± 3 x 2.5%kV per cent in a side, kV on-load changer swilch by pressure regulating range in manual and electric or automatic adjusting voltage, to ensure that the output voltage stability.Therefore.it is widely applied to high voltage quality requirements of scientific research,buildings, hotels, enterprises and institutions. This product is the updated products, with better run economic benefits.