Low-voltage lead structure capable of reducing additional loss of three-dimensional wound core transformer

Abstract

This utility model relates to a low-voltage lead structure, specifically disclosing a low-voltage lead structure that can reduce the additional losses of a three-dimensional wound core transformer. It includes an a-phase low-voltage coil, a b-phase low-voltage coil, and a c-phase low-voltage coil. The starting terminals of each phase low-voltage coil are connected to the corresponding phase terminals via copper busbars. The ending terminals of each phase low-voltage coil are interconnected via copper busbars and connected to the 0-phase terminal. The phase terminals are arranged sequentially on the same side of the transformer where two phase low-voltage coils are located. The starting and ending copper busbars of the other phase low-voltage coil, located away from the plane containing the aforementioned terminals, are partially overlapped. This utility model features a simple lead busbar structure with minimal overall bending, meeting transformer performance requirements and offering high manufacturing efficiency. It is suitable for low-voltage lead structures in three-dimensional wound core transformers.

Description

Technical Field

[0001] This utility model relates to a low-voltage lead structure, specifically a low-voltage lead structure that can reduce the additional losses of a three-dimensional wound core transformer. Background Technology

[0002] A three-dimensional wound core transformer, also known as a "triangular wound core transformer," has a core composed of three identical core frames with nearly semi-circular cross-sections. These three frames are arranged symmetrically at 120-degree angles to each other in space, and the coils wound on the core to form phases a, b, and c are arranged in a triangular configuration. When the low-voltage lead structure of a three-phase transformer uses a star (y or y0) connection, the tails of the three low-voltage phases are connected, and a suitable lead is selected from the connection points as the zero phase. Due to the spatial structure of the three-dimensional wound core transformer, in designing the low-voltage lead structure, to facilitate user wiring by bringing the low-voltage terminals of each phase to the same side while ensuring balanced three-phase resistance, current technology uses copper busbars of similar length for the three phases. This is achieved by lengthening the copper busbars of two or one phase to make their lengths similar to those of another or two phases. However, the copper busbars in the above-mentioned technologies often have many bends and complex circuit arrangements, which ultimately increases the additional losses of the copper busbars as a whole and results in low production and processing efficiency. Utility Model Content

[0003] To address the aforementioned shortcomings in the existing technology, this utility model aims to provide a low-voltage lead structure that can reduce the additional losses of a three-dimensional wound core transformer, thereby simplifying the copper busbar arrangement, making the lead structure more reasonable, and reducing the additional losses generated by the copper busbar.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A low-voltage lead structure that can reduce the additional losses of a three-dimensional wound core transformer includes an a-phase low-voltage coil, a b-phase low-voltage coil, and a c-phase low-voltage coil. The a-starting terminal of the a-phase low-voltage coil, the b-starting terminal of the b-phase low-voltage coil, and the c-starting terminal of the c-phase low-voltage coil are connected to the a-phase terminal, b-phase terminal, and c-phase terminal respectively through the starting lead copper busbars of each phase. The a-end terminal of the a-phase low-voltage coil, the b-end terminal of the b-phase low-voltage coil, and the c-end terminal of the c-phase low-voltage coil are interconnected through the end lead copper busbars of each phase and connected to the 0-phase terminal. The 0-phase terminal, a-phase terminal, b-phase terminal, and c-phase terminal are arranged sequentially on the same side of two phase low-voltage coils of the transformer. The starting and ending lead copper busbars of the other phase low-voltage coil, which is away from the plane where the above terminals are located, are overlapped.

[0005] As a limitation of this utility model: the 0-phase terminal, the a-phase terminal, the b-phase terminal, and the c-phase terminal are arranged sequentially on the same side where the a-phase low-voltage coil and the c-phase low-voltage coil are located, the b-phase low-voltage coil is on a plane away from the terminal, and the b-phase start lead copper busbar and the b-phase end lead copper busbar are arranged in an overlapping manner.

[0006] As a limitation of this utility model: both the starting copper busbar of phase b and the ending copper busbar of phase b include horizontally arranged copper busbars and vertically arranged copper busbars, with the overlapping part located at the horizontally arranged copper busbar, and the length of the overlapping part being 20% ​​to 80% of the total length of the starting copper busbar of phase b.

[0007] As a limitation of this utility model: a safety gap is provided at the overlapping part of the copper busbar at the beginning of phase b and the copper busbar at the end of phase b.

[0008] As a limitation of this utility model: the a-start terminal and a-end terminal of the a-phase low-voltage coil are located on the same side of the plane as the terminals of each phase, and the c-start terminal and c-end terminal of the c-phase low-voltage coil are located on the same side of the plane as the terminals of each phase.

[0009] As a limitation of this utility model: a) the starting terminal and a) the ending terminal are located at the same outgoing position of the a-phase low-voltage coil; c) the starting terminal and c) the ending terminal are located at the same outgoing position of the c-phase low-voltage coil.

[0010] As a limitation of this utility model: a transition copper busbar is fixedly connected between the a-phase end lead copper busbar at the a-end terminal and the c-phase end lead copper busbar at the c-end terminal; the b-phase end lead copper busbar at the b-end terminal is connected to the transition copper busbar; and a 0-phase lead copper busbar for connecting the 0-phase terminal is led out from the b-phase end lead copper busbar.

[0011] By adopting the above technical solution, the beneficial effects achieved by this utility model compared with the prior art are as follows:

[0012] This invention simplifies the arrangement of the copper busbars by arranging the terminals of each phase sequentially on the same side where the low-voltage coils of phases a and c are located. This allows the copper busbar structure of phases a and c to adopt the shortest path design. Simultaneously, the copper busbars at the beginning and end of phase b, which are located away from the terminals of other phases, are overlapped. This method of overlapping the beginning and end of the copper busbars utilizes the magnetic field cancellation effect of the reverse current to reduce the additional losses caused by the length of the copper busbars, thus balancing the three-phase resistance. The length, overlap length, and safety distance of the beginning and end copper busbars of phase b are all adjustable, and in practical applications, the specific values ​​of each parameter can be determined based on the simulation results of eddy current losses in the structural components. The overall length of the three-phase lead copper busbar in this invention is minimized, avoiding the problem of large losses in the overall accessories of the transformer due to the longer overall length of the copper busbar. Compared with the lead structure of the existing three-dimensional wound core transformer, the overall bending structure of the lead copper busbar in this invention is also greatly reduced, and the route layout of the lead copper busbar is simple, all of which improve the production efficiency of the processing and installation of the lead copper busbar. At the same time, it also solves the problem of the large overall space occupied by the existing lead copper busbar.

[0013] In summary, the copper busbar structure of this utility model is simple and reasonable, can meet the performance requirements of transformers, ensure that the resistance of each phase tends to be balanced, and at the same time reduce additional losses. It is suitable for the low-voltage lead structure of three-dimensional wound core transformers. Attached Figure Description

[0014] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0015] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model;

[0016] Figure 2 This is a top view of an embodiment of the present utility model;

[0017] Figure 3 This is a schematic diagram illustrating the wiring principle of the low-voltage lead structure in an embodiment of this utility model.

[0018] In the diagram: 1-a phase low-voltage coil, 11-a starting terminal, 12-a ending terminal, 13-a phase terminal, 14-a phase starting lead copper busbar, 15-a phase ending lead copper busbar;

[0019] 2-b phase low voltage coil, 21-b starting terminal, 22-b ending terminal, 23-b phase terminal, 24-b phase starting lead copper busbar, 25-b phase ending lead copper busbar;

[0020] 3-c phase low voltage coil, 31-c start terminal, 32-c end terminal, 33-c phase terminal, 34-c phase start lead copper busbar, 35-c phase end lead copper busbar;

[0021] 4-0 phase connection terminal, 41-transition copper busbar, 42-0 phase lead copper busbar. Detailed Implementation

[0022] The preferred embodiments of this utility model are described below with reference to the accompanying drawings. It should be understood that the low-voltage lead structure for reducing the additional losses of a three-dimensional wound core transformer described herein is a preferred embodiment and is only used for illustration and explanation of this utility model, and does not constitute a limitation thereof.

[0023] The directional terms or positional relationships used in this utility model, such as "upper" and "lower," are based on the positional relationships in the accompanying drawings of this utility model. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component must have a specific orientation, or that it must be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the content protected by this utility model. Example

[0024] This implementation example Figures 1-3 As shown, a low-voltage lead structure that can reduce the additional losses of a three-dimensional wound core transformer is presented. It includes an a-phase low-voltage coil 1, a b-phase low-voltage coil 2, and a c-phase low-voltage coil 3. The a-start terminal 11 at the beginning of the a-phase low-voltage coil 1, the b-start terminal 21 at the beginning of the b-phase low-voltage coil 2, and the c-start terminal 31 at the beginning of the c-phase low-voltage coil 3 are connected to the a-phase terminal 13, the b-phase terminal 23, and the c-phase terminal 33 respectively through the start-end lead copper busbars of each phase. The a-end terminal 12 (x terminal) at the end of the a-phase low-voltage coil 1, the b-end terminal 22 (y terminal) at the end of the b-phase low-voltage coil 2, and the c-end terminal 32 (z terminal) at the end of the c-phase low-voltage coil 3 are interconnected through the end lead copper busbars of each phase and connected to the 0-phase terminal 4.

[0025] like Figure 1 , Figure 2As shown, phase 0 terminal 4, phase a terminal 13, phase b terminal 23, and phase c terminal 33 are arranged sequentially on the same side of the transformer where two phase low-voltage coils are located, which facilitates wiring for the user. At this time, the other phase low-voltage coil becomes a low-voltage coil far from the plane where the terminals are located, and its lead copper busbar needs to be extended to its corresponding terminal. The starting and ending lead copper busbars of this low-voltage coil are overlapped. In this embodiment, the terminals are arranged sequentially on the same side where phase a low-voltage coil 1 and phase c low-voltage coil 3 are located. At this time, phase b low-voltage coil 2 is a low-voltage coil far from the plane where the terminals are located, and the starting lead copper busbar 24 and the ending lead copper busbar 25 of phase b are overlapped. Both the starting lead copper busbar 24 and the ending lead copper busbar 25 of phase b include horizontally arranged copper busbars and vertically arranged copper busbars. Figure 1 In this configuration, horizontally arranged copper busbars are those positioned horizontally, while vertically arranged copper busbars are those positioned vertically. The overlapping portion of the copper busbars is located at the horizontally arranged busbars. This method of overlapping the head and tail of the copper busbars utilizes the magnetic field cancellation effect of the reverse current to reduce additional losses caused by the length of the copper busbars, thus balancing the three-phase resistance. Generally, the vertical overlapping method is preferred, and a safety distance should be provided between the b-phase start-end lead copper busbar 24 and the b-phase end lead copper busbar 25 to ensure the magnetic field cancellation effect. In this embodiment, the safety distance is 10mm. The length of the overlapping portion between the b-phase start-end lead copper busbar 24 and the b-phase end lead copper busbar 25 is 20% to 80% of the length of the b-phase start-end lead copper busbar 24. In this embodiment, the length of the overlapping portion is approximately 70% of the length of the b-phase start-end lead copper busbar 24. The length of the copper busbar 24 at the beginning of phase b, the length of the copper busbar 25 at the end of phase b, the length of the overlapping part, the safety distance, and other parameters mentioned above can all be adjusted according to the transformer model. In practical applications, the specific values ​​of each parameter should be determined based on the simulation results of the eddy current loss of the structural components.

[0026] To further reduce the additional losses caused by the length of the copper busbar, in this embodiment, the starting terminal 11 and the ending terminal 12 of phase a low-voltage coil 1 are both located on the same side of the plane where each phase terminal is located, and the starting terminal 31 and the ending terminal 32 of phase c low-voltage coil 3 are located on the same side of the plane where each phase terminal is located. Furthermore, the starting terminal 11 and the ending terminal 12 of phase a can be set at the same outgoing position of phase a low-voltage coil 1, and the starting terminal 31 and the ending terminal 32 of phase c can be set at the same outgoing position of phase c low-voltage coil 3. The aforementioned same outgoing position means that the starting and ending terminals are located on the same side of the same radial direction of the low-voltage coil. In this way, the lengths of the copper busbars 14 and 15 at the beginning and end of phase a, 34 and 35 at the beginning and end of phase c, respectively, drawn from phase a low-voltage coil 1 and phase b low-voltage coil 2, can all be minimized, and the wiring of each copper busbar is neat and simple, with fewer overall bends in the copper busbars. The lengths of phase b end copper busbar 25 and phase b beginning copper busbar 24, as well as the length of their overlapping portion, can be adjusted by the positions of phase b beginning terminal 21 and phase b end terminal 22. In this embodiment, phase b beginning terminal 21 and phase b end terminal 22 are set at the same outgoing position on phase b low-voltage coil 2.

[0027] like Figure 3 As shown, this embodiment uses a Y-shaped low-voltage lead wiring method. The connection method of terminal 4 of phase 0 is as follows: terminal a (X terminal), terminal b (Y terminal), and terminal c (Z terminal) are interconnected through the copper busbars of the terminal leads of each phase. In this embodiment, as... Figure 1 As shown, a transition copper busbar 41 is fixedly connected between the phase a terminal 12 (a-phase) lead copper busbar 15 and the phase c terminal 32 (c-phase) lead copper busbar 35. The phase b terminal 22 (b-phase) lead copper busbar 25 is connected to the transition copper busbar 41. A phase 0 lead copper busbar 42 for connecting to phase 0 terminal 4 is led out from the phase b terminal 25. The specific position of the phase 0 lead copper busbar 42 leading out from the phase b terminal 25 must meet the requirement that the three-phase resistance tends to be balanced.

Claims

1. A low-voltage lead structure for reducing additional losses in a three-dimensional wound core transformer, comprising an a-phase low-voltage coil, a b-phase low-voltage coil, and a c-phase low-voltage coil, wherein the a-phase starting terminal, the b-phase starting terminal, and the c-phase starting terminal of the a-phase low-voltage coil are connected to the a-phase, b-phase, and c-phase terminals respectively via copper busbars of the starting leads of each phase; the a-phase ending terminal, the b-phase ending terminal, and the c-phase ending terminal of the c-phase low-voltage coil are interconnected via copper busbars of the ending leads of each phase and connected to the 0-phase terminal; characterized in that: The phase 0 terminal, phase a terminal, phase b terminal, and phase c terminal are arranged sequentially on the same side of two phase low-voltage coils of the transformer. The starting and ending copper busbars of the other phase low-voltage coil, which is away from the plane where the above terminals are located, are overlapped.

2. The low-voltage lead structure for reducing additional losses in a three-dimensional wound core transformer according to claim 1, characterized in that: The phase 0 terminal, phase a terminal, phase b terminal, and phase c terminal are arranged sequentially on the same side of the phase a low-voltage coil and the phase c low-voltage coil. The phase b low-voltage coil is located away from the plane where the terminal is located. The phase b start lead copper busbar and the phase b end lead copper busbar are arranged in an overlapping manner.

3. The low-voltage lead structure for reducing additional losses in a three-dimensional wound core transformer according to claim 2, characterized in that: Both the starting copper busbar and the ending copper busbar of phase b include horizontally arranged copper busbars and vertically arranged copper busbars. The overlapping part is located at the horizontally arranged copper busbar, and the length of the overlapping part is 20% to 80% of the total length of the starting copper busbar of phase b.

4. A low-voltage lead structure for reducing additional losses in a three-dimensional wound core transformer according to any one of claims 1 to 3, characterized in that: A safety gap is provided at the overlapping part of the copper busbar at the beginning of phase b and the copper busbar at the end of phase b.

5. A low-voltage lead structure for reducing additional losses in a three-dimensional wound core transformer according to claim 4, characterized in that: The starting and ending terminals of phase a low-voltage coil are located on the same side of the plane as the terminals of each phase, and the starting and ending terminals of phase c low-voltage coil are located on the same side of the plane as the terminals of each phase.

6. A low-voltage lead structure for reducing additional losses in a three-dimensional wound core transformer according to claim 5, characterized in that: The a-start terminal and a-end terminal are located at the same outgoing position of the a-phase low-voltage coil; the c-start terminal and c-end terminal are located at the same outgoing position of the c-phase low-voltage coil.

7. A low-voltage lead structure for reducing additional losses in a three-dimensional wound core transformer according to claim 6, characterized in that: A transition copper busbar is fixedly connected between the phase a terminal at terminal a and the phase c terminal at terminal c. The phase b terminal at terminal b is connected to the transition copper busbar, and a phase 0 terminal copper busbar for connecting to the phase 0 terminal is led out from the phase b terminal copper busbar.

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