The difference between dry-type transformer and oil-immersed

Oil-immersed transformer uses oil as its main insulation and oil as its cooling medium (self-cooling, air-cooling, water-cooling) . The main transformer of General step-up station is oil-immersed type, and its ratio is 20KV/500kv v. Dry-type transformers rely on Air convection for cooling. Small Capacity Transformer Ratio 6000V/400v V. Dry-type transformer and oil-type transformer, in addition to the same principle, the biggest difference is that there is no oil inside the transformer, and there are many differences.
　　

 1, from the appearance, the packaging form is different, dry-type transformer can directly see the iron core and coil, and oil-type transformer can only see the transformer shell;

2, lead the form is different, dry-type transformer mostly uses silicone rubber bushing,

3, capacity and voltage are different, dry-type transformer is generally suitable for power distribution, capacity is mostly below 1600KVA, voltage is below 10KV, there are individual to achieve 35KV voltage level; However, the oil-type transformer can achieve the full capacity from small to large, and the voltage level can also achieve all the voltage.

4. Insulation and heat dissipation are not the same, dry-type transformers are generally resin-insulated, relying on natural, air-cooled, large-capacity Fan cooling, and oil-type transformers are insulated by insulating oil, the heat produced by the coil is transferred to the radiator of the transformer by the circulation of insulating oil inside the transformer.

5. From the point of application, dry-type transformers are mostly used in places that need to be "fire-proof and explosion-proof" , which are easy to be used in large buildings and high-rise buildings, while oil-type transformers may have oil spouts or leakage after "accidents" , causes the fire, mostly applies in the outdoor, and has the site to dig the establishment "the accident oil pool" the place.

6, to the load bearing capacity is different, the general dry-type transformer should run under the rated capacity, and the oil-type transformer overload capacity is better.

7, the cost is not the same, the same capacity transformer, dry-type transformer purchase price than oil-type transformer price to be higher.