CN212113408U

CN212113408U - Concentric axial full-split single-phase transformer

Info

Publication number: CN212113408U
Application number: CN202020141786.XU
Authority: CN
Inventors: 靳冲; 柴淑颖; 张冬冬; 李晓新; 李亚良; 徐国杰
Original assignee: China Railway Electric Industry Co Ltd
Current assignee: China Railway Electric Industry Co Ltd
Priority date: 2020-01-22
Filing date: 2020-01-22
Publication date: 2020-12-08
Anticipated expiration: 2030-01-22

Abstract

The utility model discloses a full split single phase transformer of concentric type axial, including iron core post and winding, two iron core posts about the iron core has for mouthful style of calligraphy structure, every iron core post stacks two pairs of windings along the axial, every comprises a high voltage winding and secondary low voltage winding to the winding, a high voltage winding sets up in the inboard iron core post side of being close to promptly, secondary low voltage winding sets up in the outside. The secondary high-voltage winding in the concentric axial full-split single-phase transformer can work independently and simultaneously, and has the advantages of ingenious structure, small volume, small occupied area and low manufacturing cost.

Description

Concentric axial full-split single-phase transformer

Technical Field

The utility model belongs to the technical field of the traction power supply transformer makes, concretely relates to full split single-phase transformer of concentric type axial.

Background

In an electric power system, a split transformer is widely used in a plant substation and a backup substation. The split transformers are classified into radial split transformers and axial split transformers. In recent years, with the development of a converter technology, the requirement on the technical level of transformer power supply is improved year by year, a split transformer is required to have large capacity in some occasions, a high-capacity transformer is bound to increase the current of a low-voltage secondary winding, the conventional secondary low-voltage winding is arranged close to the inner side of an iron core column, and the outlet of a lead is axially led out, so that the integrity of an insulating end ring at the end part of the winding is damaged, certain threat is brought to the stability of the winding, and the axial outlet of the secondary low-voltage winding also brings difficulty to designers about the design and arrangement of an insulating structure of a transformer body and the lead. Therefore, a concentric axial full-split single-phase transformer is urgently needed to solve the problem which always puzzles the technical personnel in the field in the prior art.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a full split single phase transformer of concentric type axial, secondary high voltage winding can the autonomous working among this full split single phase transformer of concentric type axial, again can the simultaneous working, has that the structure is ingenious, small, area is little, low in manufacturing cost's advantage.

In order to achieve the purpose, the utility model adopts the following technical scheme:

the utility model provides a single-phase transformer is divided entirely to concentric type axial, includes iron core post and winding, its characterized in that: the iron core is a square structure and is provided with a left iron core column and a right iron core column, each iron core column is stacked with two pairs of windings along the axial direction, each pair of windings is composed of a primary high-voltage winding and a secondary low-voltage winding, the primary high-voltage winding is arranged on the inner side, namely the side close to the iron core column, and the secondary low-voltage winding is arranged on the outer side.

Further preferably, the two pairs of windings on each core limb are symmetrically placed in height direction with respect to the core limb centre.

Further preferably, the winding directions of the two primary high-voltage windings in the two pairs of windings are opposite, and the leads of the upper primary high-voltage winding and the lower primary high-voltage winding are led out from the middle of the tail end, so that the same potential at the leading-out position of the middle lead is realized, and the leads penetrate through the middle insulating end ring to be led out, are directly short-circuited and are connected in parallel through the external lead.

Further preferably, two secondary low-voltage windings in the two pairs of windings are placed outside, and the leads are directly led out in a radial direction.

The utility model has the advantages that:

the large-capacity split transformer in the prior art causes that the current of a secondary low-voltage winding is very large, the size and the number of wires are large, the opening size of upper and lower end rings of the winding is large due to the fact that the traditional form of axially leading out the wires by placing the secondary low-voltage winding on the inner side, and the stability of the coil is affected; on the other hand, because a full-split structure is adopted, the secondary low-voltage windings have small mutual influence, and a plurality of branches have no electrical connection and only weak magnetic connection, so that each secondary winding can work independently and simultaneously; the two pairs of windings on each iron core column are symmetrically arranged in the height direction relative to the center of the iron core column, so that the magnetic fields of the secondary low-voltage windings are the same, and the half-crossing impedances of the sides of the secondary low-voltage windings are the same; in practical application, if a plurality of windings are needed to supply a plurality of loads, the method for using a plurality of common transformers has higher cost and large occupied area, and adopts the concentric axial full-split single-phase transformer to replace two single-phase transformers, thereby reducing the material cost of an iron core and an insulating part, reducing the occupied area, saving the foundation cost of the transformer and having economic significance for the application in places with short working places.

Drawings

Fig. 1 is the structural schematic diagram of the coaxial full-split single-phase transformer of the present invention.

Fig. 2 is the electrical schematic diagram of the concentric axial full-split single-phase transformer of the present invention.

Fig. 3 is the lead-out schematic diagram of the concentric axial full-split single-phase transformer of the present invention.

In the figure, 1, a first secondary low-voltage winding; 2. a second low-voltage winding II; 3. a secondary low-voltage winding III; 4. a secondary low-voltage winding IV; 5. a first primary high-voltage winding; 6. a second primary high-voltage winding; 7. a primary high-voltage winding III; 8. a fourth primary high-voltage winding; 9. an iron core; 10. leading out of the secondary low-voltage winding lead on the upper side; 11. leading out of the secondary low-voltage winding lead at the lower side; 12. leading out of the upper primary high-voltage winding lead; 13. the lead of the lower primary high-voltage winding is led out.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings:

as shown in fig. 1, 2 and 3, the embodiment includes an iron core 9, a primary high-voltage winding, and a secondary low-voltage winding, the primary high-voltage winding includes a primary high-voltage winding one 5, a primary high-voltage winding two 6, a primary high-voltage winding three 7, and a primary high-voltage winding four 8, the secondary low-voltage winding includes a secondary low-voltage winding one 1, a secondary low-voltage winding two 2, a secondary low-voltage winding three 3, and a secondary low-voltage winding four 4, and on a conventional single-phase square iron core 9, the iron core 9 is in a square structure, and has left and right iron core columns which adopt a full-split structure form, and the two iron core columns and the four primary high-voltage windings are symmetrically arranged around;

the iron core 9 is fixed and symmetrically installed by a clamping piece, iron yoke insulating cushion blocks are arranged at the upper and lower iron yokes of the window of the iron core column, the middle of each iron core column is separated by the insulating cushion block, an inner side winding head-out gap is reserved, and a primary high-voltage winding and a secondary low-voltage winding of each iron core column are clamped by a pulling plate or a pulling screw rod of the iron core column; two pairs of windings are stacked on each iron core column along the axial direction, each pair of windings consists of a primary high-voltage winding and a secondary low-voltage winding, the primary high-voltage winding is arranged on the inner side, namely the side close to the iron core column, and the secondary low-voltage winding is arranged on the outer side.

The upper side winding unit corresponding to the left iron core column consists of a secondary low-voltage winding I1 and a primary high-voltage winding I5, and the lower side winding unit consists of a secondary low-voltage winding II 2 and a primary high-voltage winding II 6; the upper side winding unit corresponding to the right iron core column consists of a secondary low-voltage winding III 3 and a primary high-voltage winding III 7, and the lower side winding unit consists of a secondary low-voltage winding IV 4 and a primary high-voltage winding IV 8; the two pairs of windings on each core limb are symmetrically arranged in the height direction with respect to the core limb centre.

The winding directions of a primary high-voltage winding I5 and a primary high-voltage winding II 6 corresponding to the iron core column on the left side are opposite, leads of the primary high-voltage winding I5 and the primary high-voltage winding II 6 are led out from the middle part of the tail end, see an upper primary high-voltage winding lead outlet 12 and a lower primary high-voltage winding lead outlet 13, the same potential at the lead outlet of the middle part is realized, the leads penetrate through a middle insulating end ring to be led out, see an upper primary high-voltage winding lead outlet 14 and a lower primary high-voltage winding lead outlet 15, and the leads are directly short-circuited and connected in parallel through external leads; the secondary low-voltage winding I1 and the secondary low-voltage winding II 2 corresponding to the iron core column on the left side are placed on the outer sides, and the lead wires are directly led out in the radial direction, namely the lead wire outlet 10 of the secondary low-voltage winding on the upper side and the lead wire outlet 11 of the secondary low-voltage winding on the lower side.

The winding directions of a primary high-voltage winding three 7 and a primary high-voltage winding four 8 corresponding to the right iron core column are opposite, leads of the primary high-voltage winding three 7 and the primary high-voltage winding four 8 are led out from the middle part of the tail end, see an upper primary high-voltage winding lead outlet 12 and a lower primary high-voltage winding lead outlet 13, the same potential at the lead outlet of the middle part is realized, the leads penetrate through a middle insulating end ring to be led out, see an upper primary high-voltage winding lead outlet 14 and a lower primary high-voltage winding lead outlet 15, and the leads are directly short-circuited and connected in parallel through external leads; and the secondary low-voltage winding three 3 and the secondary low-voltage winding four 4 corresponding to the iron core column on the right side are placed on the outer sides, and the lead wires are directly led out in the radial direction, namely the lead outlet 10 of the secondary low-voltage winding on the upper side and the lead outlet 11 of the secondary low-voltage winding on the lower side.

The embodiment is only an illustration of the concept and implementation of the present invention, and is not a limitation, and the technical solution without substantial transformation is still within the protection scope under the concept of the present invention.

Claims

1. The utility model provides a single-phase transformer is divided entirely to concentric type axial, includes iron core and winding, its characterized in that: the iron core is in a square structure and is provided with a left iron core column and a right iron core column; two pairs of windings are stacked on each iron core column along the axial direction, each pair of windings consists of a primary high-voltage winding and a secondary low-voltage winding, the primary high-voltage winding is arranged on the inner side, namely the side close to the iron core column, and the secondary low-voltage winding is arranged on the outer side.

2. The concentric axial full split single phase transformer of claim 1, wherein: the two pairs of windings on each core limb are arranged symmetrically in the height direction with respect to the core limb centre.

3. The concentric axial full split single phase transformer of claim 2, wherein: two primary high-voltage windings in the two pairs of windings are opposite in winding direction, and leads of the upper primary high-voltage winding and the lower primary high-voltage winding are led out from the middle of the tail end, so that the same potential at the leading-out position of the middle lead is realized, and the leads penetrate through the middle insulating end ring to be led out, are directly short-circuited and are connected in parallel through the external lead.

4. The concentric axial full split single phase transformer of claim 2, wherein: two secondary low-voltage windings in the two pairs of windings are placed on the outer sides, and lead wires are directly led out in the radial direction.