... energy conservation 2.Low noise&environmental protection 3.Power Transformers 4.IP20 IP23 5.IEC ISO 1,11kV ... , S11 ,3 phase oil immersion power transformer 2,high efficiency, low loss 3, ... JB/T 3837-1998 technical data:1) Rated Power: 30~2500kVA2)Rated HV: 6KV,6.3KV, ... off-circuit-tap-changing distribution transformer. Customized transformers of different specification are available upon the demand ...