1.Certificate ISO9001,ISO14001 2.Made with IEC,ANSI 3.Oil immersed Distribution/Power Transformer 4.Low loss, Pollution free 10KV S11 ... S11, SZ9,SFZ9,SSZ9,SFSZ9,S10,SFZ11 and SFSZ11 series oil-immersed transformer ,with voltage class 10--110KV, and capacity 30--90000KVA ... Ministry of Electric Power and Machine Building jointly. The oil vacuum purification plants are our patent products and had been ...