Low-voltage foil winding winding transformer body assembly

Abstract

The utility model discloses a low-voltage foil winding winding transformer body assembly which comprises an iron core and a winding and further comprises a zero-phase copper bar, a zero-phase flexible connecting piece, three sets of head leading-out copper bars, three sets of three-phase flexible connecting pieces and three sets of tail leading-out copper bars. The head leading-out copper bar comprises a first vertical section of which the lower end is embedded into the winding and a first horizontal section which is vertically connected with the upper end of the first vertical section; and the upper part of the first vertical section is clamped between the clamping piece and the iron yoke. The tail leading-out copper bar comprises a second vertical section of which the lower end is embedded into the winding and a second horizontal section which is vertically connected with the upper end of the second vertical section, each second horizontal section is connected with a third horizontal section of the zero-phase copper bar through a bolt, and the third vertical section of the zero-phase copper bar is connected with the lower end of the zero-phase flexible connecting piece through a bolt. According to the utility model, the leading-out copper bar is only bent at one position, so that the processing difficulty is reduced, the bending error is reduced, and meanwhile, the advantages of convenient and reliable connection and the like are achieved.

Description

Technical Field

[0001] The utility model relates to a transformer body component. Background Art

[0002] The low-voltage winding of a large-capacity transformer is generally wound with copper foil. The head and the end of the foil winding are generally welded to the prefabricated lead-out copper bar as the outlet of the low-voltage winding. Then the lead-out copper bar at the head and the end of the winding is connected to the flexible connection piece through the horizontal transition copper bar. The flexible connection piece is led to the bottom of the low-voltage bushing. The transition copper bar and the flexible connection piece are generally welded.

[0003] Specific structure such as Figure 1 and 2 As shown, the first lead-out copper bar 2 and the last lead-out copper bar 1 are led out from the winding. In order to avoid the channel steel 9 (clamp) at the upper end, two right-angle bends are required at the upper ends of the first lead-out copper bar 2 and the last lead-out copper bar 1. The ends of the first lead-out copper bar 2 are respectively connected to a horizontal first transition copper bar 4, which is then connected to the three-phase flexible connector 6 by welding; all the last lead-out copper bars 1 are connected to the same zero-phase copper bar 3, which is then connected to the zero-phase flexible connector 5 by welding. The defects of this structure are:

[0004] 1. Due to the short distance between the two bends, the processing is difficult, time-consuming and labor-intensive.

[0005] 2. The horizontal part between the two bends passes through the gap between the clamp and the winding. The error at the bend will affect its insulation distance.

[0006] 3. The lead-out copper bar after bending is prone to shaking, and the length extending from the winding needs to be limited, resulting in the flexible connector being too long, and a clamping mechanism 7 needs to be used to fix the flexible connector. Utility Model Content

[0007] The utility model provides a low-voltage foil-wound transformer body component, which aims to solve the problems of high processing difficulty, large bending error and the need to clamp soft connectors caused by two bendings of a lead-out copper bar.

[0008] The technical solution of this utility model is as follows:

[0009] A low-voltage foil-wound transformer body assembly, comprising an iron core and a winding, wherein the iron core comprises three core columns and iron yokes respectively arranged at the upper and lower ends of the core columns, wherein the windings are in three groups, which are respectively sleeved on the outsides of the three core columns, wherein the transformer body assembly further comprises a clamp, a group of zero-phase soft connectors, and three groups of first-end lead-out copper bars, three-phase soft connectors, and last-end lead-out copper bars, wherein the clamps are in two groups, upper and lower, and each group comprises two front and rear clamps, wherein the two corresponding front and rear clamps clamp the corresponding iron yokes, and the two corresponding upper and lower clamps clamp the windings, and further comprises a zero-phase copper bar;

[0010] The first lead-out copper bar includes a first vertical section whose lower end is embedded in the winding and a first horizontal section vertically connected to the upper end of the first vertical section; the upper outer side of the first vertical section is wrapped with insulating paperboard, and the portion wrapped with insulating paperboard is clamped between the clamp and the iron yoke; the first horizontal section is connected to the lower end of the corresponding three-phase flexible connector by bolts;

[0011] The terminal lead-out copper bar includes a second vertical section whose lower end is embedded in the winding and a second horizontal section vertically connected to the upper end of the second vertical section; the zero-phase copper bar includes a third horizontal section and a third vertical section vertically connected to the end of the third horizontal section; each second horizontal section is connected to the third horizontal section by bolts, and the third vertical section is connected to the lower end of the zero-phase soft connector by bolts.

[0012] As a further improvement of the low-voltage foil-wound transformer body assembly: the clamp is an L-shaped plate, the L-shaped plate includes a horizontal part and a vertical part; the vertical parts of the two corresponding front and rear clamps clamp the corresponding iron yokes, and an insulating part is provided between the vertical part and the iron yoke;

[0013] The horizontal parts of the two corresponding clamps clamp the winding, and an insulating block is arranged between the horizontal part and the winding.

[0014] As a further improvement of the low-voltage foil-wound transformer body assembly: the upper end of the second vertical section passes through the opening on the horizontal part of the corresponding L-shaped plate.

[0015] As a further improvement of the low-voltage foil-wound transformer body assembly: both ends of the three-phase flexible connector and the zero-phase flexible connector are provided with openings for bolt connection.

[0016] As a further improvement of the low-voltage foil-wound transformer body assembly: the three-phase flexible connector and the zero-phase flexible connector are both formed by bending multiple pieces of soft copper strips.

[0017] Compared with the prior art, the utility model has the following positive effects:

[0018] 1. The improved first lead-out copper bar and the last lead-out copper bar have only one bend, which reduces the processing difficulty and the bending error.

[0019] 2. The first lead-out copper bar is led out from between the clamp and the iron yoke, and is firmly clamped. The length of the three-phase flexible connector connected to it is shortened, and there is no need to clamp the three-phase flexible connector; the last lead-out copper bar also has only one bend, and the lead-out distance relative to the winding is shorter, so it does not need to be clamped after being directly fixed to the last zero-phase copper bar.

[0020] 3. The first copper bar is led out from between the clamp and the iron yoke, and the last copper bar is led out from the opening on the clamp. This structure makes the end of the copper bar closer to the clamp, thereby reducing the width of the oil tank and the amount of transformer oil used, achieving the purpose of saving materials and reducing costs.

[0021] 4. The clamp is made of L-shaped plate, which can reduce the weight compared with channel steel and ensure the insulation distance between the lead-out copper busbar and other components.

[0022] 5. The soft connector is made of multiple pieces of copper foil and connected to the copper busbar by bolts, which eliminates unfavorable factors such as noise and flash during welding, saves processing time, and has the advantages of convenient and reliable connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A half view of a transformer body assembly in the prior art;

[0024] Figure 2 It is a left view of a transformer body assembly in the prior art;

[0025] Figure 3 It is a half view of the utility model;

[0026] Figure 4 It is a left view of the utility model;

[0027] Figure 5 for Figure 4 A partial enlarged view of part A. DETAILED DESCRIPTION

[0028] The technical solution of the utility model is described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments.

[0029] like Figure 3 , 4 5. A low-voltage foil-wound transformer body assembly includes an iron core and a winding. The iron core includes three core columns (corresponding to three phases a, b, and c) and iron yokes respectively arranged at the upper and lower ends of the core column. The winding is in three groups, which are respectively mounted on the outside of the three core columns.

[0030] The transformer body assembly also includes multiple clamps, a set of zero-phase copper busbars 3 and zero-phase flexible connectors 5, and three sets of first lead-out copper busbars 2, three-phase flexible connectors 6 and last lead-out copper busbars 1 (corresponding to a\b\c three phases).

[0031] The clamps are divided into two groups, one above and one below, and each group includes two front and rear clamps. The two front and rear corresponding clamps clamp the corresponding iron yokes through horizontal screws and nuts, and the two upper and lower corresponding clamps clamp the windings through vertical screws and nuts.

[0032] Furthermore, the clamp is an L-shaped plate 11, which includes a horizontal portion and a vertical portion. The vertical portions of the two corresponding clamps at the front and rear clamp the corresponding iron yokes, and an insulating member is provided between the vertical portion and the iron yoke. The horizontal portions of the two corresponding clamps at the top and bottom clamp the winding, and an insulating block 8 is provided between the horizontal portion and the winding.

[0033] The head lead copper bar 2 includes a first vertical section whose lower end is embedded in the winding and a first horizontal section vertically connected to the upper end of the first vertical section. The upper outer side of the first vertical section is wrapped with an insulating paperboard 10, and the portion wrapped with the insulating paperboard 10 is clamped between the clamp and the iron yoke. The lower end of the first vertical section is welded to the head of the low-voltage winding. The first horizontal section is connected to the lower end of the corresponding three-phase soft connector 6 by bolts.

[0034] The terminal lead-out copper bar 1 includes a second vertical section whose lower end is embedded in the winding and a second horizontal section vertically connected to the upper end of the second vertical section. The lower end of the second vertical section is welded to the terminal of the low-voltage winding. The upper end of the second vertical section passes through the opening 12 on the horizontal part of the corresponding L-shaped plate 11. The zero-phase copper bar 3 includes a third horizontal section and a third vertical section vertically connected to the end of the third horizontal section. Each second horizontal section is connected to the third horizontal section by bolts, and the third vertical section is connected to the lower end of the zero-phase soft connector 5 by bolts.

[0035] The three-phase flexible connector 6 and the zero-phase flexible connector 5 are both formed by bending multiple pieces of 0.3 mm soft copper strips, and both ends are provided with openings for bolt connection.

[0036] When the low-voltage winding is wound, the prefabricated first lead copper bar 2 is first welded to the copper foil. After winding according to the drawing, the corresponding last lead copper bar 1 of the low-voltage winding is welded. After the high and low windings are assembled as a whole, the iron yoke is inserted, and then the part of the first lead copper bar 2 of the low-voltage winding that passes through the upper clamp is wrapped with insulating cardboard 10. After the clamp is placed, the axial and lateral tightening between the clamps is completed with screws. While clamping the iron yoke, ensure that the first lead copper bar 2 is clamped without looseness (insulating cardboard 10 can be filled). Then place the zero-phase copper bar 3 on the upper part of the last lead copper bar 1 and tighten it with bolts. Its short side is connected to the zero-phase soft connector 5 by bolts and then led to the low-voltage zero-phase bushing. The three-phase soft connector 6 is directly bolted to the first lead copper bar 2 and led to the low-voltage bushing.

[0037] The first lead copper bar 2 is firmly clamped by the clamp and the iron core, and the three-phase flexible connector 6 connected to it is short, so it does not need to be clamped by wood. The last lead copper bar 1 is short from the winding, and it is directly fixed to the zero-phase copper bar 3 and does not need to be clamped by wood.

[0038] Furthermore, the first lead copper bar 2, the last lead copper bar 1 and the zero-phase copper bar 3 are all assembled with their narrow sides facing the box wall, which can reduce the loss caused at the same distance.

[0039] It should be noted that it is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. The scope of the present invention is defined by the claims rather than the above description.

Claims

1. A low-voltage foil-wound transformer body assembly, comprising an iron core and a winding, wherein the iron core comprises three core columns and iron yokes respectively arranged at the upper and lower ends of the core columns, wherein the windings are in three groups, which are respectively sleeved on the outside of the three core columns, wherein the transformer body assembly also comprises a clamp, a group of zero-phase flexible connectors (5) and three groups of first lead-out copper bars (2), three-phase flexible connectors (6) and last lead-out copper bars (1), wherein the clamps are in two groups, each group comprising two front and rear clamps, wherein the two corresponding front and rear clamps clamp the corresponding iron yokes, and the two corresponding upper and lower clamps clamp the windings, wherein: Also includes a zero-phase copper busbar (3); The first lead-out copper bar (2) comprises a first vertical section whose lower end is embedded in the winding and a first horizontal section vertically connected to the upper end of the first vertical section; the upper outer side of the first vertical section is wrapped with insulating paperboard (10), and the portion wrapped with the insulating paperboard (10) is clamped between the clamp and the iron yoke; the first horizontal section is connected to the lower end of the corresponding three-phase flexible connector (6) by bolts; The terminal lead-out copper bar (1) comprises a second vertical section whose lower end is embedded in the winding and a second horizontal section vertically connected to the upper end of the second vertical section; the zero-phase copper bar (3) comprises a third horizontal section and a third vertical section vertically connected to the end of the third horizontal section; each second horizontal section is connected to the third horizontal section by bolts, and the third vertical section is connected to the lower end of the zero-phase soft connector (5) by bolts.

2. The low voltage foil winding transformer body assembly according to claim 1, characterized in that: The clamp is an L-shaped plate (11), which comprises a horizontal portion and a vertical portion; the vertical portions of the two corresponding front and rear clamps clamp the corresponding iron yokes, and an insulating member is provided between the vertical portion and the iron yoke; The horizontal parts of the two corresponding upper and lower clamps clamp the winding, and an insulating block (8) is provided between the horizontal part and the winding.

3. The low voltage foil winding transformer body assembly according to claim 2, characterized in that: The upper end of the second vertical section passes through the opening (12) on the horizontal portion of the corresponding L-shaped plate (11).

4. The low voltage foil winding transformer body assembly according to any one of claims 1 to 3, characterized in that: Both ends of the three-phase flexible connector (6) and the zero-phase flexible connector (5) are provided with openings for bolt connection.

5. The low voltage foil winding transformer body assembly according to any one of claims 1 to 3, characterized in that: The three-phase flexible connector (6) and the zero-phase flexible connector (5) are both formed by bending a plurality of soft copper strips.

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