... &energy conservation 2.Low noise&environmental protection 3.Power Transformers 4.IP20 IP23 5.IEC ISO 1,15kV ... , S11 ,3 phase oil immersion power transformer 2, aluminum or copper Winding 3, high ... iron core is made of high-quality cold-rolled silicon-steel plate. High-voltage winding group is made ... 1987 JB/T 3837-1998 Technical Data:1) Rated Power: 30~2500kVA2)Rated HV: 6KV,6.3KV, 10KV ...