Transformer low-voltage lead structure and transformer

Abstract

The transformer low-voltage lead structure comprises a coil assembly and a connecting copper bar assembly, and the coil assembly comprises an A-phase coil, a B-phase coil and a C-phase coil; the A-phase coil comprises an a outgoing line copper bar and an x outgoing line copper bar, the B-phase coil comprises a b outgoing line copper bar and a y outgoing line copper bar, and the C-phase coil comprises a c outgoing line copper bar and a z outgoing line copper bar; wherein the x outgoing line copper bar, the b outgoing line copper bar, the y outgoing line copper bar and the c outgoing line copper bar are located on the same horizontal plane; and the connecting copper bar group comprises a bx connecting copper bar and a cy connecting copper bar which are used for connecting the outlet copper bars. The path between the a outlet copper bar and the z outlet copper bar is shortened, the interference between the connecting copper bars is reduced, the balance of three-phase direct-current resistance is facilitated, and the electrical performance and the stability of the transformer are improved; through multi-layer arrangement of the wire outlet copper bars and the connecting copper bars, large-angle bending of the connecting copper bars can be avoided, the width of the transformer oil tank is reduced, and the material cost is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of electric power equipment, in particular to a transformer low-voltage lead structure and a transformer. Background Art

[0002] With the development of power transmission and transformer manufacturing technology, low-voltage D-connection technology has emerged and has been widely used. Low-voltage D-connection technology has the characteristics of simplifying the transformer lead structure, reducing electromagnetic interference, and improving electrical performance. In high-power transformers, the use of low-voltage D-connection technology can effectively improve the operating efficiency and stability of the transformer.

[0003] In traditional technology, the transformer lead structure usually adopts a wound coil, which is usually formed by connecting the outgoing wire ends of each phase coil to the corresponding bushing to form a Y-type or Δ-type connection. The disadvantage of this method is that the lead structure is complex and the layout is not reasonable, which is easy to cause electromagnetic interference and coupling, affecting the electrical performance of the transformer. In addition, due to the different lead path lengths of each phase coil, it is easy to cause resistance imbalance, affecting the operating efficiency and stability of the transformer. Utility Model Content

[0004] Based on this, it is necessary to provide a transformer low-voltage lead structure and a transformer to address the problems of complex transformer lead structure and high DC resistance unbalance rate.

[0005] In a first aspect, the utility model provides a transformer low-voltage lead structure, the lead structure comprising:

[0006] The coil group includes an A-phase coil, a B-phase coil and a C-phase coil; the A-phase coil includes an a-outlet copper bar and an x-outlet copper bar, the B-phase coil includes a b-outlet copper bar and a y-outlet copper bar, and the C-phase coil includes a c-outlet copper bar and a z-outlet copper bar; wherein the x-outlet copper bar, the b-outlet copper bar, the y-outlet copper bar and the c-outlet copper bar are located on the same horizontal plane;

[0007] The connecting copper busbar group includes the bx connecting copper busbar and the cy connecting copper busbar, which are used to connect the outgoing copper busbars.

[0008] In one embodiment, the a-outgoing copper bar, the z-outgoing copper bar and the x-outgoing copper bar, the c-outgoing copper bar are located on different horizontal planes.

[0009] In one of the embodiments, it also includes az connecting copper bar, the a outgoing copper bar and the z outgoing copper bar are connected through the az connecting copper bar, the b outgoing copper bar and the x outgoing copper bar are connected through the bx connecting copper bar, and the c outgoing copper bar and the y outgoing copper bar are connected through the cy connecting copper bar, forming a D-type connection of the transformer.

[0010] In one embodiment, the a-outgoing copper bar is connected to the first heightening member, the z-outgoing copper bar is connected to the second heightening member; the a-z connecting copper bar is connected to the first heightening member and the second heightening member;

[0011] The horizontal plane where the az connecting copper busbar is located is higher than the horizontal planes where the bx connecting copper busbar and the cy connecting copper busbar are located.

[0012] In one embodiment, it also includes:

[0013] A first outgoing copper bar, a first end of the first outgoing copper bar is connected to the az connecting copper bar, and a second end of the first outgoing copper bar is connected to the bushing of the A phase coil;

[0014] A second outgoing copper bar, a first end of the second outgoing copper bar is connected to the bx connecting copper bar, and a second end of the second outgoing copper bar is connected to the bushing of the B-phase coil; and

[0015] The third outgoing copper bar, the first end of the third outgoing copper bar is connected to the cy connecting copper bar, and the second end of the third outgoing copper bar is connected to the sleeve of the C phase coil.

[0016] In one of the embodiments, a transition copper bar is further included, wherein the a-outgoing copper bar is connected to the transition copper bar, and the z-outgoing copper bar is connected to the transition copper bar.

[0017] In one embodiment, the transition copper bar is connected to the bushing copper bar of the A-phase coil.

[0018] In one of the embodiments, it also includes a first wire clamp and a second wire clamp, which are respectively arranged on the measurement side of the second outgoing copper busbar and are used to clamp and fix the second outgoing copper busbar.

[0019] In one embodiment, the A-phase coil, the B-phase coil and the C-phase coil all adopt a foil winding structure.

[0020] In a second aspect, the utility model provides a transformer, comprising the transformer low-voltage lead structure of any embodiment in the first aspect.

[0021] The transformer low-voltage lead structure and transformer set the phase heads and phase tails of the A-phase coil, the B-phase coil and the C-phase coil on different horizontal planes, so that the path between the a-outgoing copper bar and the z-outgoing copper bar becomes shorter, the connection structure between the outgoing copper bars is simpler, the interference between the connecting copper bars is reduced, it is beneficial to the balance of the three-phase DC resistance, and the electrical performance and stability of the transformer are improved; through the multi-level arrangement of the outgoing copper bars and the connecting copper bars, large-angle bending of the connecting copper bars can be avoided, the width of the transformer oil tank can be reduced, and material costs can be saved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the related technologies, the drawings required for use in the embodiments or the related technical descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A top view of a D-connected foil-wound coil transformer in conventional technology;

[0024] Figure 2 A top view of a transformer low-voltage lead structure in one embodiment of the utility model;

[0025] Figure 3 This is a schematic diagram of the connection of the transformer low-voltage lead structure in one embodiment of the utility model;

[0026] Figure 4 It is a front view of the transformer low-voltage lead structure in one embodiment of the utility model.

[0027] The reference numerals in the specific implementation manner are as follows:

[0028] A phase coil 102, B phase coil 104, C phase coil 106, a outgoing copper bar 108, x outgoing copper bar 110, b outgoing copper bar 112, y outgoing copper bar 114, c outgoing copper bar 116, z outgoing copper bar 118, bx connecting copper bar 120, cy connecting copper bar 122, first wire clamp 124, second wire clamp 126, first outgoing copper bar 128, second outgoing copper bar 130, third outgoing copper bar 132, az connecting copper bar 134. DETAILED DESCRIPTION

[0029] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0031] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0033] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0035] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0036] The applicant noted that Figure 1 As shown in the figure, for a transformer with low-voltage D-connected foil wound coil, when the lead copper bar forms D-connection, when the a head and z tail are connected, the copper bar is bent to avoid the x tail and y tail, and the width direction of the copper bar is bent parallel to the transformer box wall. When the copper bar is connected by bolts, the a-z connecting copper bar needs to be bent at a large angle, and it should be noted that the distance from the box wall should not be too close; especially for high-current transformers, when the copper bar is thick and wide, the oil tank width should be increased accordingly, the weight of transformer oil and steel increases, and the copper bar thickness exceeds the conventional range, the transformer stray loss is large, and the operation is complicated.

[0037] See also Figure 2 , Figure 2 The top view of the transformer low-voltage lead structure in one embodiment of the utility model is shown. The transformer low-voltage lead structure provided in one embodiment of the utility model includes a coil group and a connecting copper bar group. The coil group includes an A-phase coil 102, a B-phase coil 104 and a C-phase coil 106; the A-phase coil 102 includes an a-outgoing copper bar 108 and an x-outgoing copper bar 110, the B-phase coil 104 includes a b-outgoing copper bar 112 and a y-outgoing copper bar 114, and the C-phase coil 106 includes a c-outgoing copper bar 116 and a z-outgoing copper bar 118. The connecting copper bar group includes a bx connecting copper bar 120 and a cy connecting copper bar 122, which are used to connect the various outgoing copper bars.

[0038] Among them, the outgoing copper busbar is a conductive component that leads the current inside the electrical equipment to the external circuit. It is usually made of highly conductive copper material, with high mechanical strength and good electrical conductivity. In the transformer, the outgoing copper busbar is used to lead the current of the internal winding of the transformer to the external terminal, and then connected to the power grid or load. The connecting copper busbar is a flat strip conductor made of copper used for electrical connection. It connects the outgoing copper busbars of different coils to ensure reliable transmission of current between each coil and the connection point.

[0039] Specifically, the A-phase coil 102, the B-phase coil 104 and the C-phase coil 106 each include a phase head and a phase tail, and each phase head and tail are connected to different outgoing copper bars respectively; the A-phase coil 102 includes an a-phase head and an x-phase tail, the a-phase head is connected to the a-outgoing copper bar 108, and the x-phase tail is connected to the x-outgoing copper bar 110; the B-phase coil 104 includes a b-phase head and a y-phase tail, the b-phase head is connected to the b-outgoing copper bar 112, and the y-phase tail is connected to the y-outgoing copper bar 114; the C-phase coil 106 includes a c-phase head and a z-phase tail, the z-phase head is connected to the z-outgoing copper bar 118, and the z-phase tail is connected to the z-outgoing copper bar 118. The two ends of the bx connecting copper bar 120 are respectively connected to the b-outgoing copper bar 112 and the x-outgoing copper bar 110, and the two ends of the cy connecting copper bar 122 are respectively connected to the c-outgoing copper bar 116 and the y-outgoing copper bar 114.

[0040] Exemplarily, the x outgoing copper bar 110, the b outgoing copper bar 112, the y outgoing copper bar 114 and the c outgoing copper bar 116 are located at the same horizontal plane, and the horizontal planes at which the a outgoing copper bar 108 and the z outgoing copper bar 118 are located are higher than the horizontal plane at which the x outgoing copper bar 110 is located. That is, the bx connecting copper bar 120 and the cy connecting copper bar 122 are located at the same horizontal plane, and the a outgoing copper bar 108 and the z outgoing copper bar 118 are connected by connecting copper bars, and the connecting copper bar between the a outgoing copper bar 108 and the z outgoing copper bar 118 is higher than the horizontal plane at which the bx connecting copper bar 120 is located, and the low-voltage lead of the transformer is D-shaped.

[0041] In this embodiment, the phase heads and phase tails of the A-phase coil, the B-phase coil and the C-phase coil are arranged on different horizontal planes, so that the path between the a-outgoing copper busbar and the z-outgoing copper busbar is shortened, the connection structure between the outgoing copper busbars is simpler, and the interference between the connected copper busbars is reduced, which is beneficial to the balance of the three-phase DC resistance and improves the electrical performance and stability of the transformer; through the multi-level arrangement of the outgoing copper busbar and the connecting copper busbar, large-angle bending of the connecting copper busbar can be avoided, the width of the transformer oil tank can be reduced, and material costs can be saved.

[0042] Please combine Figure 2 and Figure 3 In some embodiments, the transformer low-voltage lead structure also includes a transition copper bar, the a-outgoing copper bar 108 is connected to the transition copper bar, and the z-outgoing copper bar 118 is connected to the transition copper bar; the transition copper bar is connected to the bushing copper bar of the A-phase coil; the a-outgoing copper bar 108, the z-outgoing copper bar 118 and the x-outgoing copper bar 110, the c-outgoing copper bar 116 are located on different horizontal planes.

[0043] Specifically, the a-outgoing copper bar 108 and the z-outgoing copper bar 118 are located on different horizontal planes relative to the x-outgoing copper bar 110 and the c-outgoing copper bar 116; optionally, the a-outgoing copper bar 108 and the z-outgoing copper bar 118 are located on the same horizontal plane, and the horizontal plane is higher or lower than the horizontal plane of the first x-outgoing copper bar 110, and the bx connecting copper bar 120 and the cy connecting copper bar 122 are on the same horizontal plane. The transition copper bar is located on the same horizontal plane as the a-outgoing copper bar 108 and the z-outgoing copper bar 118, the first end of the transition copper bar is indirectly connected to the a-outgoing copper bar 108 and the z-outgoing copper bar 118, and the second end of the transition copper bar is connected to the bushing copper bar of the A-phase coil, leading the low-voltage a-phase head to the bushing of the A-phase coil.

[0044] In this embodiment, the transition copper busbar makes the a-outgoing copper busbar and the z-outgoing copper busbar located on different horizontal planes relative to the bx connecting copper busbar and the cy connecting copper busbar, thereby reducing mutual interference between the leads; by directly connecting the a-outgoing copper busbar and the z-outgoing copper busbar to the transition copper busbar, the resistance of the A-phase coil is increased while reducing the path between the a-phase head and the z-phase head, which is beneficial to the balance of the three-phase DC resistance; the transition copper busbar can also improve the isolation and safety of the electrical equipment, reduce electromagnetic interference, and improve the overall electrical performance.

[0045] Combination Figure 2 and Figure 4 In some embodiments, the transformer low-voltage lead structure also includes an az connecting copper bar 134, the a outgoing copper bar 108 and the z outgoing copper bar 118 are connected through the az connecting copper bar 134, the b outgoing copper bar 112 and the x outgoing copper bar 110 are connected through the bx connecting copper bar 120, and the c outgoing copper bar 116 and the y outgoing copper bar 114 are connected through the cy connecting copper bar 122, forming a D-type connection of the transformer.

[0046] Among them, D-type connection is also called triangle connection. In the triangle connection, the head end of each winding is connected to the tail end of another winding to form a closed loop. The head of winding a phase is connected to the tail end of winding z phase, the head of winding b phase is connected to the tail end of winding x phase, and the head of winding c phase is connected to the tail end of winding y phase to form a closed loop. The three-phase power supply is connected to three connection points respectively.

[0047] Specifically, the a-outgoing copper bar 108 is connected to the first heightening member, and the z-outgoing copper bar 118 is connected to the second heightening member; the az connecting copper bar 134 is connected to the first heightening member and the second heightening member; the horizontal plane of the az connecting copper bar 134 is higher than the horizontal plane of the bx connecting copper bar 120 and the cy connecting copper bar 122. Optionally, the first heightening member and the second heightening member have the same size, and the first heightening member and the second heightening member are connecting copper bars. The first end of the first heightening member is connected to the a-outgoing copper bar 108, and the second end of the first heightening member is connected to the az connecting copper bar 134; the first end of the second heightening member is connected to the z-outgoing copper bar 118, and the second end of the second heightening member is connected to the az connecting copper bar 134.

[0048] In this embodiment, the first heightening member and the second heightening member increase the horizontal position of the az connecting copper bar, so that the a outgoing copper bar and the z outgoing copper bar can be directly connected, shortening the distance between the a phase head and the z phase tail, and forming a D-type connection while making the connection structure between the coils more compact, thereby improving the convenience of installation and maintenance; due to the addition of the first heightening member and the second heightening member, the number of contacts increases, and the coil resistance between the a phase head and the z phase tail is significantly increased, which solves the problem of large DC resistance imbalance rate during low-voltage and high-current D connection, makes the three-phase DC resistance more balanced, and optimizes the electrical performance of the transformer.

[0049] See also Figure 2 and Figure 4 In some embodiments, the transformer low-voltage lead structure further includes a first outgoing copper bar 128, a second outgoing copper bar 130 and a third outgoing copper bar 132, which are used to lead the A-phase coil, the B-phase coil and the C-phase coil to the bushing.

[0050] Specifically, the first end of the first outgoing copper bar 128 is connected to the az connecting copper bar 134, and the second end of the first outgoing copper bar 128 is connected to the bushing of the A phase coil; the first end of the second outgoing copper bar 130 is connected to the bx connecting copper bar 120, and the second end of the second outgoing copper bar 130 is connected to the bushing of the B phase coil; the first end of the third outgoing copper bar 132 is connected to the cy connecting copper bar 122, and the second end of the third outgoing copper bar 132 is connected to the bushing of the C phase coil.

[0051] Exemplarily, the a-outgoing copper bar, the b-outgoing copper bar and the c-outgoing copper bar are arranged close to the transformer box, and the x-outgoing copper bar, the y-outgoing copper bar and the z-outgoing copper bar are arranged far away from the transformer box. The b-outgoing copper bar is connected to the x-outgoing copper bar through the bx connecting copper bar, and the c-outgoing copper bar is connected to the y-outgoing copper bar through the cy connecting copper bar, and the b-outgoing copper bar, the x-outgoing copper bar, the c-outgoing copper bar, the y-outgoing copper bar and the bx connecting copper bar and the cy connecting copper bar are located in the same horizontal plane; the a-outgoing copper bar is connected to the first heightening member, the z-outgoing copper bar is connected to the second heightening member, and the az connecting copper bar is connected to the first heightening member and the second heightening member, that is, the horizontal plane where the az connecting copper bar is located is higher than the horizontal plane where the bx connecting copper bar and the cy connecting copper bar are located. The first end of the first outgoing copper bar is connected to the az connecting copper bar, and the second end of the first outgoing copper bar is connected to the bushing of the A phase coil; the first end of the second outgoing copper bar is connected to the bx connecting copper bar, and the second end of the second outgoing copper bar is connected to the bushing of the B phase coil; the first end of the third outgoing copper bar is connected to the cy connecting copper bar, and the second end of the third outgoing copper bar is connected to the bushing of the C phase coil. The first outgoing copper bar, the second outgoing copper bar and the third outgoing copper bar are arranged in sequence.

[0052] In this embodiment, each outgoing copper bar is connected to the sleeve of each coil through the first outgoing copper bar, the second outgoing copper bar and the third outgoing copper bar, thereby optimizing the external connection method of the lead structure. On the basis of the multi-horizontal placement of the bx connecting copper bar, the cy connecting copper bar and the az connecting copper bar, the arrangement position and installation position of the first outgoing copper bar, the second outgoing copper bar and the third outgoing copper bar further simplify the arrangement and connection path of the lead, making installation and maintenance more convenient; the overall structure is more compact, saving the internal space of the transformer, and can also further reduce the width and volume of the transformer.

[0053] See also Figure 2 and Figure 4 In some embodiments, the transformer low voltage lead structure further includes a first wire clamp 124 and a second wire clamp 126 .

[0054] Among them, the wire clamp is a clamp or connector used to connect and fix electrical wires, ensuring a firm connection and good electrical contact between the wires in the electrical system.

[0055] Specifically, the first wire clamp 124 and the second wire clamp 126 are respectively arranged on both sides of the second outgoing copper bar 130, and are used to clamp and fix the z outgoing copper bar 118. The first wire clamp 124 is located between the first outgoing copper bar 128 and the third outgoing copper bar 132, and the second wire clamp 126 is located between the first outgoing copper bar 128 and the second outgoing copper bar 130. Optionally, the first wire clamp 124 and the second wire clamp 126 are fixed on the bushing or the transformer housing.

[0056] In this embodiment, the outgoing copper bus and the connecting copper bus are fixed by the wire clamp, which can avoid looseness and displacement and improve the mechanical stability of the connection between the coils; the wire clamp can reduce the vibration and noise of the connecting copper bus and the outgoing copper bus and improve the operating stability of the transformer.

[0057] Please continue reading Figure 4 In some embodiments, the A-phase coil, the B-phase coil, and the C-phase coil all adopt a foil winding structure.

[0058] Among them, the foil wound coil is a coil made by winding the conductive foil material in a specific way, which can effectively reduce the inter-turn capacitance of the coil and improve the electrical isolation and voltage resistance performance.

[0059] Exemplarily, high-purity copper foil is used as the coil material, which is wound into an A-phase coil, a B-phase coil, and a C-phase coil, each of which includes an outgoing copper bar. The A-phase coil has an a-outgoing copper bar 108 and an x-outgoing copper bar 110, the B-phase coil has a b-outgoing copper bar 112 and a y-outgoing copper bar 114, and the C-phase coil has a c-outgoing copper bar 116 and a z-outgoing copper bar 118. The x-outgoing copper bar 110, the b-outgoing copper bar 112, the y-outgoing copper bar 114, and the c-outgoing copper bar 116 are arranged on the same horizontal plane; the b-outgoing copper bar 112 is connected to the x-outgoing copper bar 110 through the bx connecting copper bar 120, and the c-outgoing copper bar 116 is connected to the y-outgoing copper bar 114 through the cy connecting copper bar 122. The a outgoing copper bar 108 and the z outgoing copper bar 118 are connected to the az connecting copper bar 134 through the first and second heightening members, so that the az connecting copper bar 134 is higher than the bx connecting copper bar 120 and the cy connecting copper bar 122.

[0060] The first end of the first outgoing copper bar 128 is connected to the az connecting copper bar 134, and the second end of the first outgoing copper bar 128 is connected to the bushing of the A phase coil; the first end of the second outgoing copper bar 130 is connected to the bx connecting copper bar 120, and the second end of the second outgoing copper bar 130 is connected to the bushing of the B phase coil; the first end of the third outgoing copper bar 132 is connected to the cy connecting copper bar 122, and the second end of the third outgoing copper bar 132 is connected to the bushing of the C phase coil. The first outgoing copper bar 128, the second outgoing copper bar 130 and the third outgoing copper bar 132 are arranged in sequence. The first wire clamp 124 and the second wire clamp 126 are respectively arranged on both sides of the second outgoing copper bar 130, for clamping and fixing the outgoing copper bar, the first wire clamp 124 is located between the first outgoing copper bar 128 and the third outgoing copper bar 132, and the second wire clamp 126 is located between the first outgoing copper bar 128 and the second outgoing copper bar 130.

[0061] In this embodiment, a foil-wound coil is used as the internal coil of the transformer, so that the inter-turn capacitance is significantly reduced, the electrical isolation and voltage resistance are improved, the structure is more compact, the mechanical strength is high, the shock resistance is good, and it is suitable for various complex environments; on the other hand, the foil-wound coil provides a larger coil surface area. Since the low-voltage lead structure of the transformer is arranged in layers, the structure is more compact, so the foil-wound coil can provide better heat dissipation effect, avoid heat accumulation to generate hot spots and cause damage to the transformer, improve the heat dissipation performance and mechanical strength of the coil, and help improve the overall performance and reliability of the transformer.

[0062] In some embodiments, the utility model provides a transformer, including a transformer low-voltage lead structure as in any other embodiment.

[0063] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0064] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A transformer low voltage lead structure, characterized in that: The lead structure comprises: The coil group includes an A-phase coil, a B-phase coil and a C-phase coil; the A-phase coil includes an a-outlet copper bar and an x-outlet copper bar, the B-phase coil includes a b-outlet copper bar and a y-outlet copper bar, and the C-phase coil includes a c-outlet copper bar and a z-outlet copper bar; wherein the x-outlet copper bar, the b-outlet copper bar, the y-outlet copper bar and the c-outlet copper bar are located on the same horizontal plane; The connecting copper busbar group includes the bx connecting copper busbar and the cy connecting copper busbar, which are used to connect the outgoing copper busbars.

2. The lead structure according to claim 1, characterized in that: The a outgoing copper bar, the z outgoing copper bar, the x outgoing copper bar, and the c outgoing copper bar are located on different horizontal planes.

3. The lead structure according to claim 1, characterized in that: It also includes an az connecting copper bar, the a outgoing copper bar is connected to the z outgoing copper bar through the az connecting copper bar, the b outgoing copper bar is connected to the x outgoing copper bar through the bx connecting copper bar, and the c outgoing copper bar is connected to the y outgoing copper bar through the cy connecting copper bar, so as to form a D-type connection of the transformer.

4. The lead structure according to claim 3, characterized in that: The a-outgoing copper bar is connected to the first heightening member, and the z-outgoing copper bar is connected to the second heightening member; the a-z connecting copper bar is connected to the first heightening member and the second heightening member; The horizontal plane where the az connecting copper busbar is located is higher than the horizontal planes where the bx connecting copper busbar and the cy connecting copper busbar are located.

5. The lead structure according to claim 3, characterized in that: Also includes: A first outgoing copper bar, wherein a first end of the first outgoing copper bar is connected to the az connecting copper bar, and a second end of the first outgoing copper bar is connected to the bushing of the A-phase coil; A second outgoing copper bar, wherein a first end of the second outgoing copper bar is connected to the bx connecting copper bar, and a second end of the second outgoing copper bar is connected to the bushing of the B-phase coil; and A third outgoing copper bar, wherein a first end of the third outgoing copper bar is connected to the cy connecting copper bar, and a second end of the third outgoing copper bar is connected to the bushing of the C phase coil.

6. The lead structure according to claim 2, characterized in that: It also includes a transition copper bar, the a-outgoing copper bar is connected to the transition copper bar, and the z-outgoing copper bar is connected to the transition copper bar.

7. The lead structure according to claim 6, characterized in that: The transition copper bar is connected to the sleeve copper bar of the A-phase coil.

8. The lead structure according to claim 5, characterized in that: It also includes a first wire clamp and a second wire clamp, which are respectively arranged on the measurement of the second outgoing copper bar and are used to clamp and fix the z outgoing copper bar.

9. The lead structure according to claim 1, characterized in that: The A-phase coil, the B-phase coil and the C-phase coil all adopt a foil winding structure.

10. A transformer, characterized in that: The invention comprises the transformer low-voltage lead structure according to any one of claims 1 to 9.

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