... 2.free of pollution, heat-resistant, moisture proof 3.no partial discharge, higher reliability. Step down Dry Electrical Power ... rolled sillicon sheet2.Coil made of high quality oxygen-free copper3.Multilayered cylindric structure for high-voltage winding, ... relief valve, signal thermometer, gas relay8.Corrosion resisting treatment, maintenance free S9-M-630~10000/10 Ring TransformerPrimary voltage: 6, ...