CN207651311U - A kind of three dimensional wound core loaded capacity-regulated transformer - Google Patents

Abstract

The utility model discloses a three-dimensional winding iron core on-load capacity regulating transformer, which comprises a box body of the transformer, a coil and an iron core in the box body, and the coil is connected with a tap changer to adjust the gear position of the transformer under the condition of uninterrupted power supply; The iron core adopts a three-dimensional triangular wound core structure, which is composed of three identical single frames, including three core columns. The core columns are arranged in an equilateral triangle three-dimensionally. The lengths of the magnetic circuits of the three core columns are exactly the same and the shortest. The coil includes a high-voltage coil and a low-voltage coil, the high-low and low-voltage coils are directly wound on the iron core, and the iron core and the coil are clamped and fixed by an integral clamp. Due to the use of a three-dimensional triangular wound core structure, the material strips are tightly wound and the magnetic direction of the material strip is completely consistent with the magnetic circuit direction of the core, so as to solve the noise caused by the incoherent magnetic circuit of the stacked core. The integrated frame-type clamp increases the pressure area of the coil by 16%, and improves the short-circuit resistance of the coil.

Description

A three-dimensional wound core on-load capacity regulating transformer

technical field

The utility model relates to the technical field of electric equipment, in particular to an on-load capacity regulating transformer.

Background technique

At present, my country's rural electricity consumption is characterized by strong seasonality and concentrated electricity consumption. Rural electricity consumption is mainly concentrated in summer and autumn, mainly for electric irrigation, electricity for agricultural production, and processing of agricultural and sideline products, accounting for about 20% of the annual electricity consumption. 80% of electricity, the rest of the season is mainly lighting electricity. In busy seasons of intensive electricity consumption, transformers are seriously overloaded, sometimes even 200% overloaded; on the other hand, in off-season electricity consumption, the load rate is lower than 30%, and the phenomenon of "big horses and small carts" appears . In addition, the iron cores used in the on-load capacity regulating transformers on the market are all stacked iron cores, and the main disadvantage of the stacked iron cores is that there are many air gaps formed by joints in the magnetic circuit, which increases the reluctance of the magnetic circuit, thus Increased no-load loss and no-load current; The direction of the local magnetic circuit is inconsistent with the high magnetic permeability direction of the silicon steel strip; the gap between the sheets is not close enough, which reduces the lamination coefficient and increases the noise; the three-phase magnetic circuit Unbalanced, resulting in unbalanced three-phase current of the power transformer.

Utility model content

The utility model aims to solve the above-mentioned technical problems in the related art at least to a certain extent. Therefore, the utility model proposes a three-dimensional wound core on-load capacity regulating transformer with reasonable structure, safety and reliability, energy saving and material saving, three-phase balance and low noise.

The technical scheme that the utility model solves its technical problem adopts is:

A three-dimensional wound core on-load capacity regulating transformer, including a transformer box, a coil in the box, and an iron core. Adjust the gear position of the transformer; the core adopts a three-dimensional triangular wound core structure, that is, it is composed of three identical single frames, including three core columns, and the core columns are arranged in an equilateral triangle three-dimensionally. The lengths are exactly the same, the coils include high-voltage coils and low-voltage coils, the high-low voltage coils are wound on the iron core, and the coils are clamped and fixed around the iron core by an integral clamp.

As an improvement of the above technical solution, the single frame is formed by successively winding several strips of material, the strips are closely wound and the direction of magnetic conduction is completely consistent with the direction of the magnetic circuit of the iron core.

As a further improvement of the above technical solution, the single frame includes two left and right cylinders, the cross section of the single frame is close to a semicircle, and the core column is formed by combining two single frame cylinders. The cross section is a polygon close to a full circle.

Further, between the iron core and the low-voltage coil, and between the low-voltage coil and the high-voltage coil, insulating cardboard and stays are provided, and longitudinal oil passages are provided between the high-voltage and low-voltage coil layers.

Further, the clip includes a central screw and a triangular pressure plate, the central screw is arranged at the center of the iron core, and the triangular pressure plate is connected to both ends of the central screw to compress the coil to ensure that the coil has sufficient axial force. Compression force.

Preferably, the clamps include upper and lower clamps and tensioning screws, the upper and lower clamps are triangular frame structures, and are respectively arranged at the upper and lower ends of the coil, between the coil and the upper and lower clamps Iron yoke insulation is provided, and the tension screw fixes the upper clamp, the iron core and the lower clamp as a whole.

The beneficial effects of the utility model are: the utility model adopts a three-dimensional triangular winding iron core structure, the material strips are tightly wound, and the magnetic conduction direction of the material strip is completely consistent with the magnetic circuit direction of the iron core, and the vibration is small during operation, which solves the problem of The noise caused by the incoherent magnetic circuit of the stacked iron core. And because the integrated frame-type clamp is adopted, the pressure-bearing area of the coil is increased by 16%, and the anti-short circuit capability of the coil is improved.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

Fig. 1 is a schematic diagram of the installation structure of the utility model;

Detailed ways

With reference to Fig. 1, a kind of three-dimensional winding iron core on-load capacity regulating transformer of the present utility model comprises the casing of transformer and the coil in casing, iron core 1, and described coil is wound on described iron core 1, and described coil and The tap changer is connected to adjust the gear position of the transformer under the condition of continuous power supply; it is characterized in that: the core 1 adopts a three-dimensional triangular wound core structure, that is, it is composed of three identical single frames, including three core columns, and the The stems are arranged in an equilateral triangle, and the lengths of the magnetic circuits of the three stems are exactly the same and the shortest, which ensures the balance of the three-phase power supply, greatly reduces the magnetic resistance, and significantly reduces the excitation current and no-load loss. The coil includes a high-voltage coil 3 and a low-voltage coil 2. The high-voltage and low-voltage coils 3 and 2 are wound on the iron core 1, and the coil is clamped and fixed around the iron core 1 by an integral clamp, so that the coil The pressure area is increased by 16%, which improves the short-circuit resistance of the coil. The single frame is formed by continuous winding of several strips, the strips are closely wound and the direction of magnetic conduction is completely consistent with the direction of the magnetic circuit of the iron core 1, and the vibration is small during operation, which solves the problem of stacking iron cores. Noise from discontinuous magnetic circuits.

In addition, the single frame includes two left and right cylinders, the cross section of the single frame is close to a semicircle, and the core column is formed by combining the cylinders of the two single frames, and the cross section of the core column is close to a full circle quasi-polygon.

Further, between the iron core 1 and the low-voltage coil, between the low-voltage coil and the high-voltage coil, there are insulating cardboards and stays, and at the same time, there are longitudinal oil channels between the high-voltage and low-voltage coil layers, so that the heat dissipation effect of the transformer is better.

Further, the clip includes a central screw and a triangular pressing plate 8, the central screw is arranged at the center of the iron core 1, and the triangular pressing plate 8 is connected to both ends of the central screw for compressing the coil to ensure that the coil has sufficient The axial compression force; the clamps include upper and lower clamps 6, 7, tensioning screw, the upper and lower clamps 6, 7 are triangular frame structures, respectively arranged on the upper and lower ends of the coil, An iron yoke insulation 4 is arranged between the coil and the upper and lower clamps 6 and 7, and the tension screw fixes the upper clamp 6, the iron core 1 and the lower clamp 7 as a whole.

The above specific structure and size data are specific descriptions of the preferred embodiments of the present invention, but the invention of the present invention is not limited to the described embodiments, and those skilled in the art can also use it without violating the spirit of the present invention. Various equivalent deformations or replacements can be made, and these equivalent deformations or replacements are all included within the scope defined by the claims of the present application.

Claims (6)

1. a kind of three dimensional wound core loaded capacity-regulated transformer, including the babinet of transformer and coil, iron core in babinet, described On the iron core, the coil is connect with tap switch to adjust transformer gear in the case that not powering off coil winding；Its It is characterized in that：The iron core uses stereo-triangular wound core structure, i.e., is put together by three identical single frames, including three Stem, the stem three-dimensional arrangement in equilateral triangle, three stem lengths of magnetic path are completely the same, and the coil includes high-voltage line Circle and low-voltage coil, the height, crimping circle are wound on the iron core, and the coil is fixedly clamped by the folder of integral type Around the iron core.

2. a kind of three dimensional wound core loaded capacity-regulated transformer according to claim 1, it is characterised in that：The single frame be by Several material strips are continuously wound successively, and it is complete that close and magnetic conduction direction and the magnetic circuit direction of iron core are wound between the material strip Unanimously.

3. a kind of three dimensional wound core loaded capacity-regulated transformer according to claim 1, it is characterised in that：The single frame includes Two cylinders of left and right, close to semicircle, the stem is formed by the cylinder split of two single frames, described for the single frame cross section Stem cross section is close to full circle.

4. a kind of three dimensional wound core loaded capacity-regulated transformer according to claim 1, it is characterised in that：The iron core with it is low It is equipped with that insulating board, stay, high and low pressure coil interlayer is equipped with simultaneously between crimping circle, between low-voltage coil and high-tension coil Longitudinal oil duct.

5. a kind of three dimensional wound core loaded capacity-regulated transformer according to claim 1, it is characterised in that：The folder includes Center bolt, triangle pressing plate, the center bolt are arranged in the center of the iron core, and the triangle pressing plate is connected to The both ends of center bolt ensure that coil has enough axial pressing forces for clamping coil.

6. a kind of three dimensional wound core loaded capacity-regulated transformer according to claim 1, it is characterised in that：The folder includes Upper and lower folder, stretching screw, the upper and lower folder are triangle frame posture structure, are separately positioned on the upper and lower end of coil, institute It states and is provided with core insulation between coil and upper and lower folder, upper clamping piece, iron core and lower clamping piece are fixed as one by the stretching screw It is whole.