CN115527757A

CN115527757A - Transformer device

Info

Publication number: CN115527757A
Application number: CN202211285442.6A
Authority: CN
Inventors: 程祥; 王智洋; 王聪; 谢洪生; 李海超; 阎放
Original assignee: Shenyang Vycon New Energy Technology Co ltd
Current assignee: Shenyang Vycon New Energy Technology Co ltd
Priority date: 2022-10-20
Filing date: 2022-10-20
Publication date: 2022-12-27

Abstract

The invention discloses a transformer, comprising: the iron core groups are arranged at intervals and comprise magnetic yokes; the first windings are wound on two adjacent iron core groups; and the second windings are wound at the magnetic yokes and are triangular connection windings. The second winding is arranged at the magnetic yoke of the iron core group and is a triangular connection winding, so that third harmonic caused by iron core saturation can form circulation inside the triangular connection winding, and thus consumption does not affect an external power supply, the third harmonic caused by iron core saturation can be eliminated, voltage waveform is improved, and operation stability of the transformer is improved.

Description

Transformer

Technical Field

The invention relates to the technical field of transformers, in particular to a transformer.

Background

The three-dimensional wound iron core is a wound iron core, the whole iron core is formed by splicing three identical single frames, three core columns of the spliced iron core are arranged in an equilateral triangle three-dimensional manner, each single frame is formed by sequentially and continuously winding a plurality of trapezoid material strips, the cross section of the wound single frame is close to a semicircle, the cross section of the spliced single frame is a quasi-polygon which is very close to a whole circle, and the trapezoid material strips with different sizes of the single frames are wound and are obtained by cutting and processing by a special broken line cutting machine. The suit cutting processing can realize the processing without waste materials, namely the material utilization rate is 100 percent during suit cutting. No seam exists between the three-dimensional wound core layers, the magnetic circuits are uniformly distributed, no obvious high-resistance area exists, and the distortion phenomenon of the magnetic flux density at the seam is avoided.

In the related art, the distribution transformer occupies a large proportion of the whole power transformer, and the single-machine capacity is small, so that the distribution transformer has a great influence on the electric energy transmission efficiency of the power system. Nowadays, energy is increasingly scarce and energy conservation becomes a basic national policy, and the aims of reducing the loss of a distribution transformer and saving the production cost are commonly pursued by people.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the second winding is arranged at the magnetic yoke of the iron core group and is the triangular connection winding, so that third harmonic waves caused by iron core saturation can be eliminated, voltage waveform is improved, and operation stability of the transformer is improved.

According to an embodiment of the present invention, a transformer includes: the iron core groups are arranged at intervals and comprise magnetic yokes; the first windings are wound on two adjacent iron core groups; and the second windings are wound at the magnetic yokes and are triangular connection windings.

According to the transformer provided by the embodiment of the invention, the second winding is arranged at the yoke of the iron core group and is the triangular connection winding, so that third harmonic caused by iron core saturation can form circulation in the triangular connection winding, thereby consuming and not influencing an external power supply, eliminating the third harmonic caused by iron core saturation, realizing voltage waveform improvement and improving the operation stability of the transformer.

According to some embodiments of the invention, the second winding comprises: the inner winding is arranged on the inner side of the outer winding, the inner winding is a low-voltage winding, and the outer winding is a high-voltage winding.

According to some embodiments of the invention, the inner winding is a star-connected winding.

According to some embodiments of the invention, the outer winding is a delta connection winding.

According to some embodiments of the invention, the set of iron cores further comprises: the first winding is wound on the first column body of one of the iron core groups and the second column body of the other iron core group.

According to some embodiments of the present invention, the number of the yokes is two, the two yokes are respectively connected to both ends of the first column and the second column, the core assembly is ring-shaped, and the second winding is disposed at the yoke located above.

According to some embodiments of the invention, a junction between the yoke and the first cylinder is arc-shaped; and/or the joint between the magnetic yoke and the second column body is arc-shaped.

According to some embodiments of the invention, the shape of the cross-section of the iron core group is one of a stepped shape, a circular shape, a complex shape and a polygonal shape.

According to some embodiments of the invention, the number of said iron core groups is three, and three of said iron core groups surround a triangular ring.

According to some embodiments of the invention, a gap is provided between two adjacent iron core groups.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural diagram of a transformer according to an embodiment of the present invention.

Reference numerals:

100. a transformer;

10. an iron core group; 11. a magnetic yoke; 12. a first column; 13. a second cylinder;

20. a first winding; 21. an inner winding; 22. an outer winding;

30. a second winding.

Detailed Description

Embodiments of the present invention will be described in detail below, the embodiments described with reference to the drawings being illustrative, and the embodiments of the present invention will be described in detail below.

A transformer 100 according to an embodiment of the present invention is described below with reference to fig. 1.

As shown in fig. 1, a transformer 100 according to an embodiment of the present invention includes: a plurality of iron core group 10, a plurality of first winding 20 and a plurality of second winding 30, a plurality of iron core group 10 interval sets up, and iron core group 10 includes yoke 11, and first winding 20 is around establishing on two adjacent iron core groups 10.

The second winding 30 is wound around the yoke 11, and the second winding 30 is a delta connection winding. Therefore, the second winding 30 is arranged at the yoke 11 of the iron core group 10, and the second winding 30 is a delta connection winding, so that third harmonic caused by iron core saturation can form circulation current inside the delta connection winding, thereby consuming and not influencing an external power supply, eliminating the third harmonic caused by iron core saturation, and achieving the purposes of improving voltage waveform and improving the operation stability of the transformer 100.

Therefore, the second winding 30 is arranged at the yoke 11 of the iron core group 10, and the second winding 30 is a delta connection winding, so that third harmonic caused by iron core saturation can form circulation current inside the delta connection winding, thereby consuming and not influencing an external power supply, eliminating the third harmonic caused by iron core saturation, realizing improvement of voltage waveform, and improving the operation stability of the transformer 100.

Wherein the second winding 30 includes: the winding comprises an inner winding 21 and an outer winding 22, wherein the inner winding 21 is arranged on the inner side of the outer winding 22, the inner winding 21 is a low-voltage winding, and the outer winding 22 is a high-voltage winding. The high-voltage winding and the low-voltage winding may be input and output sections, respectively, and the input and the output sections are different windings according to the application range of the transformer 100. For example, the input voltage is 10kv, the output voltage is 0.22/0.4kv, and the input terminal is the high-voltage winding and the output terminal is the low-voltage winding. Or the input voltage is 0.22/0.4kv, the output voltage is 10kv, at this time, the input end is a low-voltage winding, and the output end is a high-voltage winding.

And the high-voltage winding is wound on the outer side of the low-voltage winding, so that external harmonic waves can be isolated through the high-voltage winding, and the influence of the external harmonic waves on the stable operation of the low-voltage winding is avoided.

Wherein the inner winding 21 may be a star connection winding, and the outer winding 22 may be a delta connection winding. Specifically, the current input ends of the three coils of the winding are head ends, and the current output ends are tail ends. Three ends are connected together, and the other three ends are connected into a three-phase power supply to form a star connection winding. The head end of each coil is connected with the tail end of the other coil to form three parallel terminals, and the three terminals are connected into a three-phase power supply and form a triangular connection winding. Taking the power supply 380V as an example, the coils of each phase of the star-connected winding are subjected to 220V, while the delta-connected winding is subjected to 380V, the star-connected winding being similar to a series connection and the delta-connected winding being similar to a parallel connection.

The sine wave current of three times and multiples of three times is generated due to the load of the transformer 100, and is characterized in that three-phase current flows in one direction, and if one winding in the transformer 100 is a triangular connection winding, the sine wave current forms a circulating current inside the triangular connection winding, so that the consumption does not affect an external power supply. If the transformer 100 is a star-connected winding, this current will be fed back to the low voltage side of the transformer 100, affecting the quality of the power supply.

If no delta connection winding is provided on the inner winding 21 and the outer winding 22, the magnetic flux formed by the sine wave current does not have a third harmonic magnetic flux circuit in the transformer 100, and the transformer 100 case generates heat.

As shown in fig. 1, the iron core set 10 further includes: the first and

second columns

12 and 13, the first and

second columns

12 and 13 are disposed at both ends of the yoke 11, and the first winding 20 is wound around the first column 12 of one of the iron core groups 10 and the second column 13 of the other iron core group 10. That is, the first winding 20 is wound between two iron core groups 10, and further, the first winding 20 may be wound between the first column 12 and the second column 13 of two adjacent iron core groups 10, so that the first column 12 and the second column 13 may be wound together by the first winding 20, thereby implementing the function of the transformer 100.

Wherein, the number of the magnetic yokes 11 is two, the two magnetic yokes 11 are respectively connected to two ends of the first column 12 and the second column 13, the iron core group 10 is annular, and the second winding 30 is arranged at the magnetic yoke 11 above. That is, two yokes 11 are provided at both ends of the first and

second cylinders

12 and 13, and the second winding 30 is provided at the upper yoke 11, that is, the second winding 30 is provided on the upper yoke 11, so that on the one hand, the voltage waveform can be optimized through the second winding 30, the operation stability of the transformer 100 is improved, and the inconvenience of placing the second winding 30 on the lower yoke 11 for the placement of the transformer 100 is avoided.

Referring to fig. 1, a joint between the yoke 11 and the first column 12 is arc-shaped, and a joint between the yoke 11 and the second column 13 is arc-shaped. Like this, set to the arc at the junction of yoke 11 and first cylinder 12, can cut down the whole size of iron core group 10 on the one hand to reduce transformer 100's weight, on the other hand iron core group 10 is whole relatively level and smooth, thereby can promote transformer 100's operating stability.

And the shape of the section of the iron core group 10 is one of a step shape, a circle shape, a complex shape and a polygon shape. Wherein, the filling factor of the step-shaped iron core group 10 is only 0.89-0.9l, compared with the polygonal section, the value is lower, and in addition, the magnetic resistance and the volume of the step-shaped section are slightly larger than those of the polygonal section. The filling factor of the circular iron core group 10 and the composite iron core group 10 is higher and reaches 0.98l3, but the material utilization rate is lower, the material belt cutting difficulty is high, the production working hours are more, and the composite iron core group 10 is arranged. The filling coefficient of the polygonal iron core group 10 can reach 0.945-0.955, the material utilization rate can reach 100%, the material belt is in a trapezoidal shape, no excess material is generated in the cutting process, and therefore silicon steel sheets can be utilized completely. In addition, the trapezoidal material belt is convenient to cut, and the cutting working time is less than half of the curved material belt.

Wherein, the number of the iron core groups 10 can be three, and the three iron core groups 10 form a triangular ring. Wherein, iron core group 10 can be three, and three iron core group 10 can enclose and establish into triangle-shaped, and wherein, the structure of triangle-shaped is more stable, like this can be through the overall stability who promotes transformer 100. Also, the iron core groups 10 may be four or more.

And, referring to fig. 1, a gap is provided between two adjacent iron core groups 10. By arranging a gap between two adjacent iron core groups 10, an electrical gap can be formed between two adjacent iron core groups 10, thereby improving the safety of the transformer 100.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A transformer, comprising:

the iron core groups are arranged at intervals and comprise magnetic yokes;

the first windings are wound on two adjacent iron core groups;

and the second windings are wound at the magnetic yokes and are triangular connection windings.

2. The transformer of claim 1, wherein the second winding comprises: the inner winding is arranged on the inner side of the outer winding, the inner winding is a low-voltage winding, and the outer winding is a high-voltage winding.

3. The transformer of claim 2, wherein the inner winding is a wye connection winding.

4. The transformer of claim 2, wherein the outer winding is a delta connection winding.

5. The transformer according to claim 1, wherein the core assembly further comprises: the first winding is wound on the first column body of one of the iron core groups and the second column body of the other iron core group.

6. The transformer according to claim 5, wherein the number of the yokes is two, two yokes are respectively coupled to both ends of the first and second columns, the core assembly has a ring shape, and the second winding is disposed at the yoke positioned above.

7. The transformer of claim 5, wherein a junction between the yoke and the first leg is arcuate; and/or the joint between the magnetic yoke and the second column is arc-shaped.

8. The transformer according to claim 1, wherein the shape of the cross-section of the core group is one of a stepped shape, a circular shape, a complex shape and a polygonal shape.

9. The transformer according to claim 1, wherein the number of the iron core groups is three, and three iron core groups surround a triangular ring.

10. The transformer according to claim 1, wherein a gap is provided between two adjacent iron core groups.