Dry-type transformer

Abstract

The invention provides a dry-type transformer. The dry-type transformer comprises a transformer coil and a coil cooling part, the transformer coil comprises a first coil and a second coil which are formed by winding windings, each winding comprises a conductive wire core and an insulating skin wrapping the wire core, the first coil and the second coil are each covered with a solid insulating layer, and the coil cooling part comprises a cooling liquid shell and aheat exchanger. The cooling liquid shell is provided with a containing cavity used for containing the insulating cooling liquid, the transformer coil is arranged in the containing cavity, and the insulating cooling liquid is used for exchanging heat with the transformer coil; and the heat exchanger is provided with a heat exchange flow channel, and the heat exchange flow channel is connected with the containing cavity of the cooling liquid shell, so that the insulating cooling liquid exchanges heat with a heat exchange medium outside the heat exchange flow channel when circulating into the heat exchange flow channel. The dry-type transformer is better in cooling effect.

Description

technical field [0001] The invention relates to the technical field of power equipment, in particular to a dry-type transformer. Background technique [0002] The transformer coil of a dry-type transformer is a whole made of epoxy resin and a conductor. Some existing dry-type transformers are installed under the transformer coil or driven by an external fan to cool the transformer coil. The cooling medium is air. , leading to poor cooling effect, and the temperature around the transformer coil is easy to be too high. [0003] There are also some dry-type transformers that arrange metal heat-conducting plates or U-shaped pipes inside the coils, and then connect them to external radiators for cooling, but installing metal plates in the transformer coils will result in larger transformer coils and may be due to the internal insulation level of the coils. Not enough to cause electrical failure. The cooling method of arranging one or more layers of U-shaped pipes inside the tra...

AI Technical Summary

Problems solved by technology

[0002] The transformer coil of a dry-type transformer is a whole made of epoxy resin and a conductor. Some existing dry-type transformers are installed under the transformer coil or driven by an external fan to cool the transformer coil. The cooling medium is air. , leading to poor cooling effect, and the temperature around the transformer coil is easy to be too high

[0003] There are also some dry-type transformers that arrange metal heat-conducting plates or U-shaped pipes inside the coils, and then connect them to external radiators for cooling, but installing metal plates in the transformer coils will result in larger transformer coils and may be due to the internal insulation level of the coils. Not enough to cause electrical failure

The cooling method of arranging one or more layers of U-shaped pipes inside the transformer coil and connecting the U-shaped pipes to the external radiator not only has similar problems, but once the U-shaped pipes have coolant leakage problems, the transformer coils will be damaged. There will be electrical failure or direct scrapping

In summary, the transformer coils of existing dry-type transformers are inefficiently cooled by air, which leads to unsatisfactory heat dissipation effects of dry-type transformers, and the structure of transformers based on the design of using air heat dissipation is not compact.

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