The difference between dry type transformers and oil transformers

The difference between dry type transformers and oil transformers
Dry type transformer and transformer oil compared to, in addition to the same working principle, the biggest difference is that there is no oil inside the transformer, while there are many differences.
1. Cooling: oil immersed transformer is oil as the main means of insulating transformers, rely on oil as a cooling medium (self-cooled air-cooled water-cooled.). Booster station master general variants are oil-immersed, variations than 20KV / 500KV.Dry-type transformers rely on air convection cooling. Small-capacity transformer ratio 6000V / 400V.
2. The overall structure: from the appearance point of view, different packages, dry-type transformers can directly see the core and coil, and transformer oil transformer can only see the shell; dry-type transformers are mostly silicon rubber casing, while oil Most transformers
3, the capacity and the voltage is different: dry-type transformers are generally applicable to power distribution capacity 1600KVA mostly in less voltage 10KV or less, there are individual achieve 35KV voltage level; and oil-type transformers but they can do it all from small to large capacity voltage level also do all voltages; 1000KV UHV test line under construction in China, the use of certain oil-type transformers.
4, insulation and heat are not the same: dry-type transformers are generally used resin insulated by natural air-cooled, high-capacity cooling by fan, while oil-insulated transformers by insulating oil, insulating oil by circulating inside the transformer coil tropical produce to the transformer radiator (piece) on cooling.
5, the load bearing capacity different: Usually dry-type transformers should be operated at the rated capacity and the oil transformer overload better.