Transformer distribution transformer CE,SGS certification Excellent cost performance High reliability and stability ... oxygen-free copper3.Multilayered cylindric structure for high-voltage winding, toroidal structure for low-voltage winding, fine performance4.New insulation ... treatment, maintenance free S9-M-630~10000/10 Electric Power Distribution TransformerPrimary voltage: 6, 6.3, 10, 10.5, 11 ...