The Difference Between Dry Type Transformers And Oil Immersed Transformers

(1) The packaging looks different. Dry-type transformers can see the core and coil directly. Oil-immersed transformers can only see the outside of the transformer.

(2) Dry-type transformers with different guiding forms mostly use silicon rubber sleeves, and oil-immersed transformers mostly use porcelain sleeves.

(3) The distribution network generally adopts dry-type transformers of different capacities and different voltages, most of which have a capacity below 1600 KVA, a voltage below 10 kV, and a voltage level below 35kV. Oil-immersed transformers can achieve various capacities and voltages. grade.

(4) Dry-type transformers with different insulation and heat dissipation generally use resin insulation, rely on natural air cooling, and rely on fan cooling for large capacity. Oil-immersed transformers are insulated by insulating oil, and the radiator of the transformer is heated by circulating the insulating oil inside the transformer.

(5) Dry-type transformers with different applicable places are mostly used in places that require "fire prevention and explosion prevention", and are easy to use in large buildings and high-rise buildings. However, oil-immersed transformers are almost used outdoors. After the "accident", the oil-immersed transformer will leak oil, which may cause a fire.

(6) The load capacity of dry-type transformers is different. Dry-type transformers usually work at fixed capacity, and oil-immersed transformers have good overload capacity.

(7) The purchase price of transformers and dry-type transformers of this capacity is much higher than that of oil-immersed transformers.

(8) The bigger difference between different oil-immersed transformers and dry-type transformers lies in their cooling medium. The former uses transformer oil as a cooling and insulating medium, and the latter uses air or other gases such as SF 6 as a cooling medium. For oil immersed transformers, the tank containing the solid transformer oil with the core and wire wraps is placed. Dry-type transformers typically encapsulate the iron core and coils on the cast parts with epoxy. Dip it in the special insulating paper for winding wire, and apply special insulating paint to prevent moisture from winding wire and iron core.