CN203351363U - Lead structure of three-dimensional rolled core transformer with double split windings - Google Patents

Abstract

The lead wire structure of a three-dimensional wound core double-split transformer disclosed by the utility model includes three-dimensional wound cores arranged in a triangle and fixed between the upper clamp and the lower clamp, and A, B, C three-phase coil, the upper clamp is provided with a high-voltage lead bracket and the bracket is provided with A, B, and C phase high-voltage terminals, and each phase coil includes an upper high-voltage coil, a lower high-voltage coil, an upper low-voltage coil and a lower low-voltage coil. Coils, the upper high-voltage coil and the upper low-voltage coil are concentrically placed on the upper half of the three-dimensional wound core, the lower high-voltage coil and the lower low-voltage coil are concentrically placed on the lower half of the three-dimensional wound core, and the high and low voltage coils use triangle and star coils respectively. Shaped wiring structure, simple structure and material saving, solves the problem of complex three-dimensional lead wire structure of double-split transformer with three-dimensional wound core.

Description

Lead wire structure of a three-dimensional wound core double-split transformer

technical field

The utility model relates to the technical field of transformer lead wires, in particular to a lead wire structure of a three-dimensional wound core double-split transformer.

Background technique

In order to save investment and reduce floor space, double-split transformers are widely used in photovoltaic power generation, wind power generation, factory smelting, etc. Currently, the double-split transformers on the market are mostly laminated core transformers, whether they are oil-immersed or dry-type. It belongs to the traditional transformer, and its planar structure leads to unbalanced three-phase iron core magnetic circuit, no-load loss, large no-load current, large harmonics, and large noise.

In this case, the research and development of the three-dimensional wound core double-split transformer will have great market potential, but the three-dimensional wound core is a three-dimensional symmetrical structure, and its lead wire structure is relatively complicated, which must not only meet the balance of the resistance of each phase, but also save copper. .

Utility model content

In order to solve the above technical problems, the utility model provides a lead wire structure of a three-dimensional wound core double-split transformer. A problem with a complex structure.

In order to achieve the above object, the technical solution adopted in the utility model is:

A lead wire structure of a three-dimensional wound core double-split transformer, comprising triangularly arranged three-dimensional wound cores fixed between an upper clamp and a lower clamp, and A, B, and C three-phase coils respectively wound on the three-dimensional wound cores, The upper clamp is provided with a high-voltage lead bracket and the bracket is provided with A, B, and C phase high-voltage terminals, and each phase coil includes an upper high-voltage coil, a lower high-voltage coil, an upper low-voltage coil and a lower low-voltage coil. The upper high-voltage coil and the upper low-voltage coil are concentrically placed on the upper half of the three-dimensional wound core, the lower high-voltage coil and the lower low-voltage coil are concentrically placed on the lower half of the three-dimensional wound core, and the upper clamp and the lower clamp are respectively provided with There are A, B, C phase upper low-voltage terminal blocks and A, B, C phase low-voltage terminal blocks corresponding to the low-voltage coils of each phase;

The lead wire structure of the high-voltage coil: the upper and lower high-voltage coils of each phase coil are connected in parallel. After parallel connection, the incoming wire ends of the high-voltage coils of each phase are connected to the high-voltage terminals corresponding to the coils of each phase, and the incoming wire ends of the high-voltage coils of phase A are connected to To the outgoing line end of the C-phase high-voltage coil, the incoming line end of the C-phase high-voltage coil is connected to the outgoing line end of the B-phase high-voltage coil, and the incoming line end of the B-phase high-voltage coil is connected to the outgoing line end of the A-phase high-voltage coil, forming a triangular connection structure;

Lead wire structure of low-voltage coils: the upper low-voltage coils of each phase coil are connected from the upper part of the upper clamp with copper bars, and connected to the neutral point set in the middle of the upper clamp, so that the distance from the three-phase outlets to the neutral point is the same, and the upper low-voltage The incoming wire ends of the coils are respectively connected to the corresponding upper low-voltage terminals, and the lower low-voltage coils use U-shaped copper bars to lead from the side of the lower clamp to the neutral point, and the incoming wire ends are respectively connected to the corresponding lower low-voltage terminals. Form a star connection structure.

The improvement of the above technical solution lies in that the upper low-voltage terminal and the lower low-voltage terminal are located on the same side, and the phase connection positions of the upper and lower low-voltage terminals correspond to each other.

The improvement of the above technical solution lies in that the upper and lower voltage coils are connected to the neutral point by using a connection structure of copper tubes or copper bars.

The improvement of the above technical solution lies in that the lower low-voltage coil is connected to the neutral point from the side of the lower clip by using a U-shaped copper tube or copper bar.

The improvement of the above technical solution lies in that a support plate is provided at the middle of the upper clamping piece for fixing the neutral point terminal.

Beneficial effects of the utility model: the lead wire structure of the utility model simplifies the layout of the lead wires ingeniously, reduces the materials used, and makes the three-phase phase resistance and the line resistance of the high-voltage coil and the upper and lower low-voltage coils all reach balance, and the structure is simple and economical. material, which solves the complex problem of the three-dimensional lead wire of the three-dimensional wound core double-split transformer.

Description of drawings

Below in conjunction with accompanying drawing, the specific embodiment of the present utility model is described further.

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

Fig. 2 is a schematic diagram of the lead wire structure of the medium and high voltage coil of the present invention.

Fig. 3 is a top view structural diagram of the utility model.

Fig. 4 is a schematic diagram of the lead wire structure of the middle and upper low-voltage coils of the present invention.

Fig. 5 is a schematic diagram of the working circuit principle of the utility model.

Detailed ways

Referring to Fig. 1 to Fig. 4, the lead wire structure of a three-dimensional wound core double-split transformer provided by the utility model can make the three-phase phase resistance and line resistance of the high-voltage coil and the upper and lower low-voltage coils reach balance, and its structure includes a fixed Between the upper clamp 1 and the lower clamp 2 are three-dimensional wound cores 3 arranged in a triangle and A, B, and C three-phase coils respectively wound on the three-dimensional wound cores 3. The upper clamp 1 is provided with a high voltage Lead wire support 11 and support are provided with A, B, C phase high-voltage terminal 12, each phase coil includes upper high-voltage coil, lower high-voltage coil, upper low-voltage coil and lower low-voltage coil, and described upper high-voltage coil and upper low-voltage coil are concentric Placed on the upper half of the three-dimensional wound core 3, the lower high-voltage coil and the lower low-voltage coil are concentrically placed on the lower half of the three-dimensional wound core 3, wherein the high-voltage coil is a primary coil placed outside the three-dimensional wound core 3, and the low-voltage The coil is a secondary coil, placed between the high voltage coil and the three-dimensional wound core 3 . The upper clamping piece 1 and the lower clamping piece 2 are respectively provided with A, B, C phase upper low voltage connection terminals 13 and A, B, C phase lower low voltage connection terminals 21 corresponding to the low voltage coils of each phase.

The above double-split transformer adopts a Dy11y11 connection lead structure, that is, the high-voltage coil adopts a delta connection, and the low-voltage coil adopts a star connection, wherein the phase angle difference between the high-voltage coil and the low-voltage coil is 30°. The specific lead structure is as follows: the upper and lower high-voltage coils in each phase coil are connected in parallel to form the incoming and outgoing ends of the high-voltage coil, and after parallel connection, the incoming ends of the high-voltage coils of each phase are connected to the high-voltage terminals 12 corresponding to the coils of each phase. At the same time, the incoming line end of the A-phase high-voltage coil is connected to the outgoing line end of the C-phase high-voltage coil, the incoming line end of the C-phase high-voltage coil is connected to the outgoing line end of the B-phase high-voltage coil, and the incoming line end of the B-phase high-voltage coil is connected to the A-phase The outlet end of the high-voltage coil forms a triangular connection structure. The upper low-voltage coil of each phase coil is connected from the upper part of the upper clamp 1 by copper bars, and connected to the neutral point set in the middle of the upper clamp 1, so that the distance from the three-phase outgoing line end to the neutral point is the same, and the incoming line of the upper low-voltage coil The ends are respectively connected to the corresponding upper low-voltage terminal 13, and the lower low-voltage coil uses a U-shaped copper bar to connect the neutral point from the side of the lower clamp 2, and its incoming wire ends are respectively connected to the corresponding lower low-voltage terminal 21, forming Star connection structure, the working circuit principle of the above structure is shown in Figure 5, the left side is the delta connection method of the high-voltage coil, and the right side is the star connection method of the low-voltage coil.

The further improvement of the above connection structure is that the upper low-voltage connection terminal 13 and the lower low-voltage connection terminal 21 are located on the same side, and the upper and lower phase connection positions correspond. The lead wire structure of this embodiment is: as shown in Figure 4, the upper low-voltage coil It is composed of a1, b1, c1 three-phase upper and lower voltage coils, and the neutral point is set in the middle of the upper clamp 1, so that the distance from the three-phase copper bars to the neutral point is the same to achieve resistance balance. Among them, the incoming lines of a1 and c1 The end is located on one side of the upper clamp 1, but the incoming end of b1 is located at b1' on the other side of the clamp, and the copper bar is used to lead b1' from the upper part of the neutral point copper bar of the upper clamp 1 to a1 and c1 side, and then connect the corresponding upper low-voltage terminal 13. The lower low-voltage coil is composed of a2, b2, and c2 three-phase upper and lower voltage coils. U-shaped copper bars are used to fix along the side of the lower clamp 2, and the neutral points of the three phases are welded to balance, and then U-shaped copper bars are used to lead b2' to a2 and One side of c2, and then connect the corresponding upper low-voltage terminal 13, so that the upper low-voltage terminal 13 and the lower low-voltage terminal 21 are located on the same side, the appearance is simple and beautiful, and the connection is more convenient.

In order to achieve the balance of the three-phase resistance, the distance between the outlet end of the upper low-voltage coil and each connection point of the neutral point terminal is the same, and the distance between the outlet end of the lower low-voltage coil and each connection point of the neutral point terminal is the same. In addition, a support plate is provided in the middle of the upper clamp 1 for fixing the neutral point terminal, and the above connection structure may use copper tubes instead of copper bars. the

The above is only a preferred embodiment of the utility model, the utility model is not limited to the structure of the above-mentioned embodiment, the structure of the above-mentioned double split transformer can also be applied to the lead structure of Dy11d0 and Yd11d11, as long as it uses the same The means to achieve the technical effect of the utility model should belong to the protection scope of the utility model.

Claims (5)

1. the pin configuration of the two transformer with split windings of a three dimensional wound core, comprise the three dimensional wound core be triangularly arranged (3) that is fixed between upper clamping piece (1) and lower clamping piece (2) and respectively around the A on three dimensional wound core (3), B, the C three-phase coil, described upper clamping piece (1) is provided with high-voltage lead wire bracket (11) and this support is provided with A, B, C phase high-voltage connection terminal (12), it is characterized in that: each phase coil includes high-tension coil, lower high-tension coil, upper low-voltage coil and lower low-voltage coil, described upper high-tension coil and upper low-voltage coil are placed in the first half of three dimensional wound core (3) with one heart, described lower high-tension coil and lower low-voltage coil are placed in the latter half of three dimensional wound core (3) with one heart, be respectively equipped with the A corresponding with each phase low-voltage coil on described upper clamping piece (1) and lower clamping piece (2), B, C goes up low-voltage wiring terminal (13) and A mutually, B, C descends low-voltage wiring terminal (21) mutually,

The pin configuration of high-tension coil: upper and lower two high-tension coil connect in parallel in each phase coil, after in parallel, the end of incoming cables of each phase high-tension coil is connected on the high-voltage connection terminal corresponding with each phase coil (12), the end of incoming cables of A phase high-tension coil is connected to the leading-out terminal of C phase high-tension coil simultaneously, the end of incoming cables of C phase high-tension coil is connected to the leading-out terminal of B phase high-tension coil, the end of incoming cables of B phase high-tension coil is connected to the leading-out terminal of A phase high-tension coil, forms the delta connection structure;

The pin configuration of low-voltage coil: the upper low-voltage coil of each phase coil connects from the top of upper clamping piece (1), be connected to the neutral point that upper clamping piece (1) middle part arranges, make the three-phase leading-out terminal identical to the distance of neutral point, the end of incoming cables of upper low-voltage coil is connected to respectively corresponding upper low-voltage wiring terminal (13), lower low-voltage coil connects neutral point from lower clamping piece (2) side lead-in wire, its end of incoming cables is connected to respectively corresponding lower low-voltage wiring terminal (21), forms the star-star connection structure.

2. the pin configuration of the two transformer with split windings of a kind of three dimensional wound core according to claim 1, it is characterized in that: described upper low-voltage wiring terminal (13) and lower low-voltage wiring terminal (21) are positioned at the same side, and the phase place link position of upper and lower low-voltage wiring terminal is corresponding.

3. the pin configuration of the two transformer with split windings of a kind of three dimensional wound core according to claim 1, it is characterized in that: described upper low-voltage coil utilizes the connecting structure of copper pipe or copper bar to be connected to neutral point.

4. the pin configuration of the two transformer with split windings of a kind of three dimensional wound core according to claim 1, it is characterized in that: described lower low-voltage coil utilizes U-shaped copper pipe or copper bar to connect neutral point from lower clamping piece (2) side.

5. the pin configuration of the two transformer with split windings of a kind of three dimensional wound core according to claim 1 is characterized in that: the medium position of described upper clamping piece (1) is provided with supporting bracket for fixing neutral point.

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