The difference between dry-type transformers and oil-immersed transformers
1. From the appearance, the packaging methods are different. For dry-type transformers, the iron core and coils can be directly seen, while for oil-type transformers, only the outer shell of the transformer can be seen.
2. Lead differently. Dry-type transformers mostly use silicone rubber bushings, and oil transformers mostly use porcelain bushings;
3. The capacity and voltage are different. Dry-type transformers are generally suitable for power distribution. Most of the capacity is below 3150KVA and the voltage is below 10KV. Some can reach 35KV. Oil-immersed transformers can handle the full capacity from small to large, and the voltage levels can also handle all voltages.
4. Insulation and heat dissipation are different. Dry-type transformers generally use resin insulation, natural air cooling, and large-capacity fan cooling, while oil transformers are insulated with insulating oil. The insulating oil circulates inside the transformer, and the heat generated by the coil radiates to the transformer radiator (chip).
5. From the perspective of application, dry-type transformers are mostly used in places that require "fire and explosion protection", and are generally easy to use in large buildings and high-rise buildings; however, oil transformers are mostly used outdoors, and there is an "accident oil pool" dug in the center. " may be sprayed or leaked, causing a fire.
6. Different load capacities. Ordinary dry-type transformers must operate at rated capacity. It would be better if oil-type transformers can be overloaded.
7. Fees vary. For transformers of the same capacity, the purchase price of dry-type transformers is higher than that of oil-type transformers.