Double-split rectifier transformer adopting transposed conductors

Abstract

The utility model relates to a double split rectifier transformer adopting transposed conductors, which comprises an iron core and windings, the windings comprise an upper low-voltage winding and a lower low-voltage winding, the upper low-voltage winding and the lower low-voltage winding are both wound by transposed conductors, the bottom of the upper low-voltage winding is provided with a winding lower wire end I, and the top of the upper low-voltage winding is provided with a winding upper wire end I; the bottom of the lower low-voltage winding is provided with a winding lower wire head II, the top of the lower low-voltage winding is provided with a winding upper wire head II, the winding lower wire head I and the winding lower wire head II are mutually connected, and the winding upper wire head I and the winding upper wire head II are respectively connected with the wiring terminal through crimping heads. According to the utility model, the winding adopts the transposed conductor, so that the manual transposed winding process is omitted, the winding process is simplified, the winding precision is improved, and the winding period is shortened. The transposed conductor can be directly connected with the wiring terminal without a copper bar, so that the traditional process of welding the copper bar is omitted, the processing time is reduced, and the wire leading operation becomes simple and rapid.

Description

Technical Field

[0001] The utility model relates to a rectifier transformer, in particular to a double-split rectifier transformer using transposed conductors. Background Art

[0002] Large-capacity double-split rectifier transformers have large capacity and high low-voltage current. They are generally used in smelting industries with complex working conditions. During operation, sudden short circuits frequently occur. Although the time of sudden short circuits is very short, the short circuit current is very large, which causes the coil to be subjected to a large electric force and causes the coil temperature to rise rapidly. At high temperatures, the mechanical strength of the winding decreases rapidly, causing the coil to be damaged. Therefore, in order to improve the transformer's ability to resist short circuits, in addition to the design structure guarantee, the winding process of the winding is very important. The winding radial line segment must be tightly wound, neatly arranged, and without skew. At the same time, when multiple radial wires are wound in parallel, in order to make the length of each parallel-wound wire equal and ensure that the longitudinal leakage magnetic flux received by the winding is equal, the wires at different positions in the radial direction must be swapped during the winding process. This process of wire swapping is called winding transposition. This transposition must be completed manually, and there are requirements for the width, height, and bending angle of the transposition. Insulating materials must be used to wrap the transposition to ensure that the insulation of the wires is not damaged during the compression and operation of the winding. This winding method has high winding technology, complex operation and long winding period.

[0003] After the double-split low-voltage winding is wound and formed, it is arranged up and down along the axial direction and mounted on each core column. The copper bar is used to weld the winding head, and then it is welded with the copper terminal and connected to the transformer bushing. Before welding the copper bar, the following preparations should be carried out: copper bar cutting, bending, tinning, etc. The winding head should be arranged and protected with cotton cloth to prevent damage to the root insulation of the winding head. The welding quality also has a great impact on the product quality, so the welding technology requirements are also very high. After the welding is completed, the surface of the welding part is smoothed, the residual insulation around the welding part is removed, and it is re-wrapped to ensure that the insulation of the winding is not damaged during operation. The whole process takes a long time. For projects with a large number of units and tight production schedules, the manufacturing pressure of the transformer is very high. Summary of the invention

[0004] The technical problem to be solved by the utility model is to provide a double-split rectifier transformer adopting transposed conductors to overcome the shortcomings of the prior art.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A double-split rectifier transformer using transposed conductors comprises an iron core and windings, wherein the windings comprise an upper low-voltage winding and a lower low-voltage winding, both of which are wound using transposed conductors, a winding lower wire head 1 is provided at the bottom of the upper low-voltage winding, a winding upper wire head 1 is provided at the top of the upper low-voltage winding, a winding lower wire head 2 is provided at the bottom of the lower low-voltage winding, a winding upper wire head 2 is provided at the top of the lower low-voltage winding, the winding lower wire head 1 and the winding lower wire head 2 are connected to each other, and the winding upper wire head 1 and the winding upper wire head 2 are respectively connected to connection terminals through crimping joints.

[0007] The wiring terminals include cables and cold-pressed wiring terminals.

[0008] The transposed conductor comprises stacked enameled copper flat wires, the outside of which is covered with insulating paper.

[0009] The outer surfaces of the first winding lower wire end, the first winding upper wire end, the second winding lower wire end and the second winding upper wire end are covered with an outer insulating layer.

[0010] The outer insulating layer is crepe paper, cable paper, telephone paper, cloth tape or heat shrink tape.

[0011] Compared with the existing technology, the beneficial effects of the utility model are:

[0012] 1) The transposed conductor of the utility model has completed the transposition of the conductors inside, and the lengths of multiple strands of conductors are equal, which ensures that the longitudinal leakage magnetic flux received by the winding is equal, reduces the circulating current, and reduces the eddy current loss. The enameled copper flat wire inside the transposed conductor makes the strands of wire bonded together during the heating and drying process of the winding, thereby improving the short-circuit resistance of the coil.

[0013] 2) The utility model adopts transposed conductors for the winding, which saves the manual transposition winding process, simplifies the winding process, improves the winding accuracy, and shortens the winding period.

[0014] 3) The utility model adopts transposed wires to directly connect the terminal blocks without copper bars, thus eliminating the traditional copper bar welding process, reducing processing time, making the lead operation simple and quick, shortening the transformer manufacturing period, and improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model.

[0016] Figure 2 This is a schematic diagram of the structure of the wiring terminal.

[0017] Figure 3 This is a schematic diagram of the structure of the transposed conductor.

[0018] Figure 4 for Figure 1 Sectional view at AA.

[0019] In the figure: iron core 1, upper low-voltage winding 2, lower low-voltage winding 3, upper winding wire end 1 4, lower winding wire end 1 5, lower winding wire end 2 7, crimping joint 8, terminal 9, cable 10, cold-pressed terminal 11, enameled copper flat wire 12, insulating paper 13, outer insulating layer 14. DETAILED DESCRIPTION

[0020] In the description of the present invention, it should be understood that the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means more than two.

[0021] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0022] like Figure 1-Figure 4 A double-split rectifier transformer using transposed conductors includes an iron core 1 and windings. The windings include an upper low-voltage winding 2 and a lower low-voltage winding 3. Both the upper low-voltage winding 2 and the lower low-voltage winding 3 are wound using transposed conductors. A winding lower wire head 5 is provided at the bottom of the upper low-voltage winding 2, a winding upper wire head 4 is provided at the top of the upper low-voltage winding 2, a winding lower wire head 2 7 is provided at the bottom of the lower low-voltage winding 3, and a winding upper wire head 2 6 is provided at the top of the lower low-voltage winding. The winding lower wire head 1 5 and the winding lower wire head 2 7 are connected to each other, and the winding upper wire head 1 4 and the winding upper wire head 2 6 are respectively connected to the connection terminal 9 through the crimping joint 8.

[0023] The wiring terminal 9 includes a cable 10 and a cold-pressed wiring terminal 11 .

[0024] The transposed conductor comprises stacked enameled copper flat wires 12 , and the enameled copper flat wires 12 are coated with insulating paper 13 .

[0025] The outer surfaces of the winding upper wire end 1 4 , the winding lower wire end 1 5 , the winding upper wire end 2 and the winding lower wire end 2 7 are covered with an outer insulating layer 14 .

[0026] The outer insulating layer 14 is made of crepe paper, cable paper, telephone paper, cloth tape or heat shrink tape.

[0027] In order to make the purpose, technical scheme and technical effect of the utility model clearer, the technical scheme in the embodiment of the utility model is now described clearly and completely. However, the embodiment described below is only a part of the embodiment of the utility model, not all of the embodiments. In combination with the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] Example

[0029] A double-split rectifier transformer using transposed conductors comprises an iron core 1 and windings, wherein the windings comprise an upper low-voltage winding 2 and a lower low-voltage winding 3, both of which are wound using transposed conductors, and the conductors comprise 13 stacked enameled copper flat wires 12, the enameled copper flat wires 12 being coated with insulating paper 13.

[0030] The bottom of the upper low-voltage winding 2 is provided with a winding lower wire head 1 5, the top of the upper low-voltage winding 2 is provided with a winding upper wire head 1 4, the bottom of the lower low-voltage winding 3 is provided with a winding lower wire head 2 7, the top of the lower low-voltage winding is provided with a winding upper wire head 2 6, the winding lower wire head 1 5 and the winding lower wire head 2 7 are connected to each other, and the winding upper wire head 1 4 and the winding upper wire head 2 6 are respectively connected to the terminal 9 through the crimping head 8. The terminal 9 includes a cable 10 and a cold-pressed terminal 11.

[0031] The outer surfaces of the winding upper wire head 1 4, the winding lower wire head 1 5, the winding upper wire head 2 and the winding lower wire head 2 7 are covered with an outer insulating layer 14. The outer insulating layer 14 is crepe paper.

[0032] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and basic spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A double-split rectifier transformer using transposed conductors, comprising an iron core and a winding, wherein the winding comprises an upper low-voltage winding and a lower low-voltage winding, characterized in that: The upper low-voltage winding and the lower low-voltage winding are both wound with transposed conductors. A lower winding head 1 is provided at the bottom of the upper low-voltage winding, an upper winding head 1 is provided at the top of the upper low-voltage winding, a lower winding head 2 is provided at the bottom of the lower low-voltage winding, and an upper winding head 2 is provided at the top of the lower low-voltage winding. The lower winding head 1 and the lower winding head 2 are connected to each other, and the upper winding head 1 and the upper winding head 2 are respectively connected to the terminal blocks through crimping joints.

2. A double-split rectifier transformer using transposed conductors according to claim 1, characterized in that: The wiring terminals include cables and cold-pressed wiring terminals.

3. A double-split rectifier transformer using transposed conductors according to claim 1, characterized in that: The transposed conductor comprises stacked enameled copper flat wires, the outside of which is covered with insulating paper.

4. A double-split rectifier transformer using transposed conductors according to claim 1, characterized in that: The outer surfaces of the first winding lower wire end, the first winding upper wire end, the second winding lower wire end and the second winding upper wire end are covered with an outer insulating layer.

5. A double-split rectifier transformer using transposed conductors according to claim 4, characterized in that: The outer insulating layer is crepe paper, cable paper, telephone paper, cloth tape or heat shrink tape.

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