Dry type transformer

Abstract

The invention relates to the technical field of transformers, and in particular to a dry type transformer. The dry type transformer comprises a transformer main body, an upper clamping member and a lower clamping member, wherein the transformer main body comprises iron cores and high-voltage coils and low-voltage coils which are assembled on the iron cores. The dry type transformer has the beneficial effects that a low-pressure mold formed by combining two half molds is adopted to facilitate the operation; when copper bars and copper foils are welded, the copper bars inside the copper foils are cut along the diagonal line to reduce the cost of raw materials; a pouring hole is reserved in a limiting board between an inner mold and an outer mold of the high-voltage coils and the height of resin is measured by adopting a limiting gauge to ensure that the usage amount of the resin is reduced and the outer surface is beautiful; the clamping members are formed by bending steel plates and circular arcs are formed by adopting laser cutting to ensure that the mechanical strength is high and the appearance is beautiful; steel pull plates adopt magnetic isolating steel plates and long circular grooves are milled in the middle parts of the steel pull plates to avoid eddy current heating; the iron cores adopt cross-core screw structures and the stacking adopts a seven-step in-out joint process to reduce the noise and the loss of the transformer; and the high-voltage coils adopt cake structures to reduce the usage amount of the iron cores, the copper wires and the copper foils.

Description

technical field [0001] The invention relates to the technical field of transformers, in particular to a dry-type transformer. Background technique [0002] At present, the low-voltage mold of the dry-type transformer adopts an integral type with a support plate in the middle. It takes a long time for the operator to install and remove the mold, and the work efficiency is low; when the low-voltage copper bar is wound, the outer lead wire row is higher than the inner lead wire The copper bar welded with the copper foil is a whole piece without cutting. The low-voltage insulator uses the inner lead bar that fixes the low-voltage coil of each phase. The waste of copper bar is large, the amount of insulators is large, and the cost of raw materials is high; the upper part of the high-voltage inner film is installed The flange cover plate is welded with a 50mm high stop box, the amount of resin poured is large, which wastes raw materials, and the excess resin needs to be polished, ...

AI Technical Summary

Problems solved by technology

[0002] At present, the low-voltage mold of the dry-type transformer adopts an integral type with a support plate in the middle. It takes a long time for the operator to install and remove the mold, and the work efficiency is low; when the low-voltage copper bar is wound, the outer lead wire row is higher than the inner lead wire The copper bar welded with the copper foil is a whole piece without cutting. The low-voltage insulator uses the inner lead bar that fixes the low-voltage coil of each phase. The waste of copper bar is large, the amount of insulators is large, and the cost of raw materials is high; the upper part of the high-voltage inner film is installed The flange cover plate is welded with a 50mm high stop box, the amount of resin poured is large, which wastes raw materials, and the excess resin needs to be polished, which makes the process complicated; the high-voltage coil adopts a four-section spiral structure, radially between the layers The amount of mesh cloth is large, the distance between the axial sections is large, the amount of iron core, copper wire, and resin is large, and raw materials are wasted; the clamp adopts channel steel type, which is not beautiful in appearance and poor in mechanical strength. The two ends of the clamp are connected by side screws , easy to deform; the steel drawing plate is made of ordinary steel plate, and the middle is not milled, the drawing plate is easy to generate heat and the eddy current loss is large, the two ends are made of round steel, turned into large and small heads with a lathe, and passed between the clamp hole and the drawing plate hole, The appearance is ugly; the base adopts channel steel type, and when the transformer is installed in place, the front and rear ends of the channel steel of the base tend to be upturned, the mechanical strength is poor, and the appearance is ugly; when installing the fan, in order to ensure a safe distance between the bare electrode of the high-voltage coil and the fan Generally, the width of the lower clamp is increased to connect with the channel steel of the base, and the channel steel of the lower clamp is seriously wasted; the iron core adopts a five-step in and out seam process, the process coefficient is large, the no-load loss is large, the upper and lower iron yokes are not perforated, and the iron core Noisy when running

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