Dry-type transformer with oval coil

Abstract

The invention discloses a dry-type transformer with an oval coil. The dry-type transformer comprises a shell, a transformer core body, a high-voltage binding post and a low-voltage binding post. The transformer core body is arranged in the shell, the transformer core body comprises an outer iron core, an iron core column, a first winding and a second winding, and the transformer core body is of a shell-type structure. The first winding and the second winding are wound on the iron core column to serve as coils on the low-voltage side and the high-voltage side to be connected with the low-voltage binding post and the high-voltage binding post, and the cross section of the iron core column is oval. The coils are wound on the iron core column with the oval section, compared with a traditional round winding column, the arrangement mode can fully wrap the magnetic induction lines, under the same perimeter of the section of the iron core column, the area which is not surrounded by the outer iron core is greatly reduced, and most of the magnetic induction lines are restrained in the transformer core body. And cables used by the first winding and the second winding have elliptical sections and are obliquely wound on the iron core column.

Description

technical field [0001] The invention relates to the technical field of dry-type transformers, in particular to a dry-type transformer with elliptical coils. Background technique [0002] Dry-type transformers are widely used in airports, buildings, factories and other places with large power consumption at the end of the power grid. Its good fire resistance is its main advantage over oil-immersed transformers. [0003] However, because there is no transformer oil in the dry-type transformer, its heat capacity is small, and the internal local temperature rise will quickly accumulate in one place. If it cannot be detected and exported in time, it will easily cause damage. The transformer winding is made of enameled wire. The integrity of the insulating varnish on the surface of the cable directly determines the insulation performance between the cables. Another frequent problem of the dry-type transformer that arises from this is that due to the high heat generation of the win...

AI Technical Summary

Problems solved by technology

[0003] However, because there is no transformer oil in the dry-type transformer, its heat capacity is small, and the internal local temperature rise will quickly accumulate in one place. If it cannot be detected and exported in time, it will easily cause damage. The transformer winding is made of enameled wire. The integrity of the insulating varnish on the surface of the cable directly determines the insulation performance between the cables. Another frequent problem of the dry-type transformer that arises from this is that due to the high heat generation of the winding, there will be cracks on the adjacent contact surfaces of the cables. The accumulation of heat will cause the insulation layer to age and fail. Once the insulation layer fails, the turn-to-turn short circuit will affect the normal use of the transformer.

Images