Outdoor dry-type transformer

Abstract

The invention discloses an outdoor dry-type transformer which comprises a high-voltage coil, a low-voltage coil, an iron core, gap walls and an outer wall. Resin is cast to the space between the high-voltage coil and low-voltage coil and the space between a coil and the iron core to form the gap walls, the gap space is filled with the gap walls, resin is cast to form the outer wall wrapping the high-voltage coil, the low-voltage coil and the iron core, the three coils are connected into a whole by the outer wall, and the iron core is a closed three-dimensional wound core. Insulation between the high-voltage coil and the low-voltage coil and insulation between the low-voltage coil and the iron core are all solid insulation of the resin. As the dielectric constant of the resin is far larger than that of air, insulation distance can be greatly shortened, namely, the distance between the high-voltage coil and the low-voltage coil can be shortened, and the overall dimensions of the transformer coils are decreased. The high-voltage coil, the low-voltage coil and the iron core are cast together, deformation of the coils can be prevented, the short circuit resistance of the transformer is enhanced, the influence of external wind, sun and rain can be resisted, severe environments can be resisted, and the outdoor dry-type transformer can be used as an outdoor transformer.

Description

technical field [0001] The invention relates to a transformer, in particular to an outdoor dry-type transformer. Background technique [0002] At present, there are two kinds of transformers for outdoor use, outdoor dry-type transformer with planar stacked core structure (this structure has unbalanced three-phase magnetic circuit, large noise, and large no-load loss), oil-immersed transformer (the transformer is filled with oil, and the oil is not only flammable and not environmentally friendly). Due to the changeable outdoor climate and environment, the wind, sun, and rain will greatly interfere with outdoor equipment. At present, most of the transformers used outdoors are oil-immersed transformers (oil transformers). Transformers (dry transformers) are generally only used indoors. In order to stabilize the structure of the dry transformer, there is a dry transformer in which the high and low voltage coils and the iron core are poured into one body through resin, and the ...

AI Technical Summary

Problems solved by technology

In order to ventilate and dissipate heat from the air passage, the thickness of the pouring connector at the interval position is also relatively large. After forming, its physical properties are relatively poor, it is difficult to resist the harsh outdoor environment, and it is easy to age, deform and crack. Therefore, this structure cannot be used for outdoor transformers.

Images