CN211907187U

CN211907187U - Folding three-phase transformer

Info

Publication number: CN211907187U
Application number: CN202020285940.0U
Authority: CN
Inventors: 胡石林
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-03-10
Filing date: 2020-03-10
Publication date: 2020-11-10
Anticipated expiration: 2030-03-10

Abstract

The folding three-phase transformer is a folding symmetrical transformer. The core is divided into three units along the center line of the yoke from the axial direction of the core, and the three units are respectively represented by A ', B ' and C '. Each iron yoke is folded into 120 degrees by stacking one or more iron yoke sheets along the length direction of the iron yoke, the bent part of each iron yoke sheet is provided with an R arc, and the iron yoke sheets and the iron core column sheets are stacked into A ', B ' and C ', and the three units are combined into the transformer core. The iron yoke and the iron core column are connected by the inclined surface and the trapezoidal connecting structure, so that lamination is facilitated, connection between a cylinder and a rectangular area is guaranteed, the problem of difficulty in manufacturing three-phase symmetrical transformation is solved, and production of a three-phase symmetrical transformer is realized; on the other hand, the symmetry of the three-phase transformer is realized, the magnetic circuit of the iron core is reduced, the unbalanced loss of the circuit is reduced, the harmonic amplitude of the circuit is reduced, and the temperature of the transformer is reduced; the material for the three-phase transformer is reduced at a large rate.

Description

Folding three-phase transformer

Technical Field

The utility model relates to a whole electric power trade is a foldable three-phase transformer.

Background

At present, three-phase transformers used in the power industry are all linear asymmetric transformers. The main reason is that the manufacturing process of the three-phase symmetrical transformer is complex and cannot be implemented.

SUMMERY OF THE UTILITY MODEL

For the problem that can't implement of solving among the background art that three-phase symmetrical transformer preparation technology is complicated, the utility model provides a foldable three-phase transformer, concrete technical scheme is as follows.

A folding three-phase transformer comprises an iron core column and an iron yoke, wherein the iron core column is formed by overlapping a plurality of iron core column iron sheets; the iron yoke is formed by overlapping a plurality of iron yoke iron sheets, and is characterized in that: the iron yoke iron sheet is bent by 120 degrees along the length direction, the bent part is an R arc, the iron yoke iron sheet and the iron core column iron sheet are stacked into three units A ', B' and C ', and the three units A', B 'and C' are combined into a transformer iron core; at the junction of the iron yoke and the iron core column, the odd number layers are connected by adopting 45-degree inclined planes, and the even number layers are connected by adopting 90-degree trapezoids.

The structure adopts three-part lamination, and a bevel and trapezoidal connecting structure is adopted between the iron yoke and the iron core column, so that the lamination is convenient, and the connection of a cylinder and a rectangular area is ensured.

Preferably, the folded three-phase transformer may be a voltage transformer.

Owing to adopted above technical scheme, compare with prior art, the utility model discloses: 1. three-part lamination is adopted, and a connection structure of an inclined surface and a trapezoid is adopted between the iron yoke and the iron core column, so that the lamination is convenient, the connection of a cylinder and a rectangular area is ensured, the problem of difficulty in manufacturing three-phase symmetrical transformation is solved, and the production of the three-phase symmetrical transformer is realized; 2. the symmetry of the three-phase transformer is realized, the magnetic circuit of an iron core is reduced, the unbalanced loss of a circuit is reduced, the harmonic amplitude of the circuit is reduced, and the temperature of the transformer is reduced; 3. the material for the three-phase transformer is reduced at a large rate.

Drawings

Fig. 1 is a schematic structural view of the present invention;

fig. 2 is a schematic structural diagram of the iron core unit of the present invention;

fig. 3 is a schematic structural view of the core column of the present invention;

fig. 4 is a perspective view of the iron core unit of the present invention;

fig. 5 is a front view of a conventional three-phase in-line transformer;

FIG. 6 is a top view of FIG. 5;

FIG. 7 is a front view of a conventional three-phase in-line transformer after being cut;

FIG. 8 is a top view of FIG. 7;

FIG. 9 is a front view of a re-assembled transformer core;

FIG. 10 is a top view of FIG. 9;

FIG. 11 is a perspective view of FIG. 9;

FIG. 12 is a perspective view of a re-assembled transformer core;

FIG. 13 is a perspective view of FIG. 12 cut away in the axial direction;

FIG. 14 is a top view of FIG. 13;

fig. 15 is a side view of the core unit of the present invention;

fig. 16(a) is a schematic view of a connection mode of a single-layer yoke and a core limb according to the present invention;

fig. 16(b) is a schematic view of the connection mode of the double-layer yoke and the core limb according to the present invention;

fig. 17 is a structural diagram of the transformer of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to (fig. 1), a folding three-phase transformer includes three core legs (fig. 1), an upper yoke and a lower yoke, the three core legs having three respective vertical positions disposed at three vertices of an equilateral triangle, as shown in (fig. 4), the yoke being a connecting core connecting the three core legs, as shown in (fig. 1) divided into an upper yoke and a lower yoke. The core legs are connected in a star shape along the center line of the yoke in the axial direction. At 120 degrees to each other in one plane.

As shown in (fig. 1, 3, 4), the core limb is formed by vertically stacking a number of core limb iron sheets.

The iron yoke unit (figure 4) is formed by transversely folding a plurality of iron yoke iron sheets.

The iron core column iron sheets and the iron yoke iron sheets are respectively laminated to form an iron core unit A ', an iron core unit B ' and an iron core unit C '. And combining the units A ', B ' and C ' together to form the three-phase star-shaped transformer core.

The following further explains that the three-phase star transformer of the present invention saves more iron core material compared with the existing three-phase in-line transformer. And the manufacturing method of the three-phase star transformer of the present invention will be described in detail.

Three core legs of the three-phase transformer A, B, C are connected by yokes into a straight line (fig. 5-8), the length of the magnetic path of the core:

L_a＝L_cc +2a +2b and L_b＝c

The magnetic flux of the iron core is inversely proportional to the length of the iron core and is proportional to the sectional area of the iron core, and the length is increased so as to keep the magnetic flux of the iron core unchanged. The sectional area of the iron core is correspondingly increased, and the magnetic sectional area of the iron core is L in order to keep three-phase symmetry Lb_a、L_cThe sectional areas of the magnetic paths of the iron cores are the same. Even then, the asymmetry problem of three-phase transformers cannot be solved completely.

4. The manufacturing method of the folding three-phase transformer comprises the following steps:

1) annealing the iron yoke iron sheet;

2) symmetrically placing the annealed iron yoke iron sheet into a first V-shaped groove with an R arc, and extruding, fixing, quenching and tempering and aging the iron yoke iron sheet by using another second V-shaped groove with an R' arc; the angles of the V-shaped grooves of the first V-shaped groove and the second V-shaped groove are both 120 degrees;

3) stacking a plurality of iron yoke iron sheets into an iron yoke iron sheet layer, stacking a plurality of iron core column iron sheets into an iron core column layer, and placing the iron yoke iron sheet layer and the iron core column iron sheet layer in a first V-shaped groove in the following way: firstly, two iron yoke iron sheet layers are placed, and then the two iron core column layers are closed to the joints at the two ends of the two iron yoke iron sheet layers to form an iron sheet layer, so that the iron sheet layers are stacked one on another and stacked to the last layer; then, the second V-shaped groove is used for extruding and fixing the iron yoke iron sheet layer and the iron column iron sheet layer; the iron yoke is formed by laminating a plurality of iron yoke iron sheets, and the iron core column is formed by laminating a plurality of iron core columns;

4) and (3) solidifying the iron core below the upper connection point of the iron yoke and the iron core column, and synthesizing the three units A ', B ' and C ' into the transformer iron core. The following production process is the same as the in-line transformer (fig. 17). The upper connection point is a connection point of the upper iron core column and the upper iron yoke.

Further, as shown in fig. 16(a and b), the iron sheet layers include a single layer and a double layer, the iron yoke iron sheet layers in the single layer are connected with the iron column layer by a 45 ° inclined plane, and the iron yoke iron sheet layers in the double layer are connected with the iron column layer by a 90 ° trapezoid.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims

1. A folding three-phase transformer comprises an iron core column and an iron yoke, wherein the iron core column is formed by overlapping a plurality of iron core column iron sheets; the iron yoke is formed by overlapping a plurality of iron yoke iron sheets, and is characterized in that: the iron yoke iron sheet is bent by 120 degrees along the length direction, the bent part is an R arc, the iron yoke iron sheet and the iron core column iron sheet are stacked into three units A ', B' and C ', and the three units A', B 'and C' are combined into a transformer iron core; at the junction of the iron yoke and the iron core column, the odd number layers are connected by adopting 45-degree inclined planes, and the even number layers are connected by adopting 90-degree trapezoids.

2. The foldable three-phase transformer of claim 1, wherein: the shown folded three-phase transformer is a voltage transformer.