1. Cooling method
Dry-type transformers being cooled by air convection, while oil-type transformers cooled by the media of oil, such as oil immersed with self-cooling, oil immersed with wind-cooling, and oil immersed with water-cooling
2. Lead forms
Most dry-type transformers use silicone rubber bushings, while most oil-type transformers use porcelain bushings;
3.Capacities and Voltages
Dry-type transformer is normally suitable for power distribution. Most of the capacities are below 1600KVA and the voltage is below 10KV. Some of them can reach 35KV voltage level. However, oil-type transformers can have full capacity from small to large and all voltage levels. Voltage; the ultra-high voltage 1000KV test line under construction in our country must use oil-type transformers.
