High-voltage-resistant paper insulation acetal enameled transposition wire

Abstract

The utility model relates to a high-voltage-resistant paper insulation acetal enamelled transposition wire, which comprises a transposition wire core and a plurality of layers of insulation paper wrapped outside the transposition wire core. The transposed wire core comprises an A enameled wire unit and a B enameled wire unit which are symmetrically arranged, and a C enameled wire arranged in the center of the tops of the two enameled wire units; the enameled wire unit A is formed by stacking a group of enameled wires A, and the enameled wire unit B is formed by stacking a group of enameled wires B; the enameled wire A, the enameled wire B and the enameled wire C all comprise copper flat wires, and the outer surfaces of the copper flat wires are coated with acetal paint layers. A cutting line is arranged between the side part of the A enameled wire unit and / or the B enameled wire unit and the insulation paper, and the end part of the cutting line is clamped at the outer side of the end part of the A enameled wire or the B enameled wire. When the insulation paper needs to be disassembled, the insulation paper can be cut by pulling open the cutting line, and then the insulation paper is torn down by a worker, so that the operation is very convenient, the disassembly time of the insulation paper is greatly shortened, and the labor intensity of the worker is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of transposed conductors, in particular to a high-voltage resistant paper-insulated acetal enameled transposed conductor. Background Art

[0002] The use of transposed conductors in the windings of large power transformers can greatly reduce load losses, reduce the temperature rise of hot spots in the windings, improve the mechanical strength of the windings, make the structure more compact, and make coil processing easier. Therefore, once the transposed conductors came out, they have been widely used in the design and manufacture of large power transformer windings. The transposed conductors are composed of a certain number of enameled copper flat wires combined into two rows with the wide sides touching each other, and the same direction is transposed along the narrow side on the upper and lower sides of the two rows of enameled wires as required, and then they are continuously and tightly wrapped with electrical insulating paper tapes in multiple layers.

[0003] At present, in order to protect the environment and reduce resource waste, after the transformer winding is scrapped, the insulating paper on the transposed conductor will be torn off and the enameled copper flat wire will be recycled to achieve the recycling of copper resources. In the prior art, the insulating paper is torn off manually, which takes a long time to disassemble. In addition, the insulating paper is in a state of multiple layers of continuous and tightly wrapped, which is difficult to cut and the labor intensity of workers is high. Utility Model Content

[0004] The present application provides a high-voltage paper-insulated acetal enameled transposed conductor to overcome the above-mentioned problems existing in the prior art. The high-voltage paper-insulated acetal enameled transposed conductor of the present application adopts a specific structural design, has good integrity, and has good mechanical strength and high temperature resistance, high voltage resistance and other properties; it sets a cutting line between the transposed wire core and the external insulating paper, so that when the insulating paper needs to be disassembled, the insulating paper can be cut by pulling the cutting line, and then the insulating paper can be torn off by the staff, which is very convenient to operate, greatly shortening the disassembly time of the insulating paper and reducing the labor intensity of the workers; in addition, a limiting part is set at the end of the cutting line, and it is stuck on the outside of the end of the transposed wire core, so as to avoid the cutting line from shrinking to the inside of the transposed wire, and it is convenient for the staff to pinch the end of the cutting line when using it.

[0005] The technical solution of this application is:

[0006] A high-voltage resistant paper insulated acetal enameled transposed conductor comprises a transposed wire core and a plurality of layers of insulating paper wrapped around the outside of the transposed wire core; the transposed wire core comprises an A enameled wire unit and a B enameled wire unit symmetrically arranged, and a C enameled wire arranged at the top center of the A enameled wire unit and the B enameled wire unit, and transposed in the same direction along the narrow surface above and below the A enameled wire unit and the B enameled wire unit; the A enameled wire unit is formed by stacking a group of A enameled wires; the B enameled wire unit is formed by stacking a group of B enameled wires; The enameled wires are stacked and placed in layers; the C enameled wire is overlapped with the A enameled wire and the B enameled wire located on the top layer respectively; the A enameled wire, the B enameled wire and the C enameled wire all include copper flat wires, and the outer surface of the copper flat wire is coated with an acetal paint layer; a cutting line is provided between the side of the A enameled wire unit and / or the B enameled wire unit and the insulating paper; the cutting line is arranged along the length direction of the copper flat wire; and limiting parts are respectively provided at both ends of the cutting line, and the limiting parts are clamped on the outer side of the end of the A enameled wire or the B enameled wire.

[0007] Compared with the prior art, the high-voltage paper-insulated acetal enameled transposed conductor of the present application is provided with a cutting line distributed along the length direction of the transposed wire core between the transposed wire core and the external insulating paper, so that when the insulating paper needs to be disassembled, the insulating paper can be cut by pulling the cutting line, and then the insulating paper can be torn off by the staff, which is very convenient to operate, greatly shortens the disassembly time of the insulating paper, and reduces the labor intensity of the workers; a limiting portion is provided at the end of the cutting line and is clamped on the outside of the end of the transposed wire core, so that the cutting line can be prevented from shrinking into the inside of the transposed wire, and it is convenient for the staff to use it. Pinch the end of the cutting wire; in addition, in the transposed conductor of the present application, the transposed wire core includes two enameled wire units designed side by side, and a single enameled wire arranged on the top of the enameled wire unit, and the outer insulation layer is formed by winding multiple layers of insulating paper, so that the internal enameled wire can fit tightly, thereby improving the integrity and insulation performance of the transposed conductor, and each enameled wire is coated with acetal insulating varnish on the outer surface of the copper flat wire, which can effectively ensure the conductivity of the enameled wire and can withstand high temperatures above 200 degrees Celsius, so that the transposed conductor has good mechanical strength and high temperature resistance, high voltage resistance and other properties.

[0008] As an optimization, in the aforementioned high-voltage paper insulated acetal enameled transposed conductor, cutting wires are provided between the side of the A enameled wire unit and the B enameled wire unit and the insulating paper. Thus, when one of the cutting wires is damaged and broken, another cutting wire can be used to cut the insulating paper. Furthermore, the wire diameter of the cutting wire can be 0.1mm to 0.15mm. Thus, under the premise of ensuring the strength of the cutting wire, the cutting wire can be as thin as possible to reduce the space it occupies. Furthermore, the cutting wire is made of polyethylene fiber material. Polyethylene fiber has high strength, low density, good insulation, good fatigue resistance and load-bearing capacity, so that the breaking force of the cutting wire is relatively high.

[0009] As an optimization, in the aforementioned high-voltage paper-insulated acetal enameled transposed conductor, an insulating lining paper is provided between the A enameled wire unit and the B enameled wire unit. The design of the insulating lining paper can separate the two enameled wire units, avoiding collision between the two rows of enameled wires during the process of winding the transformer coil with the transposed conductor, causing the acetal paint layer to be worn through and affecting the insulation performance; and can also form a gap between the two enameled wire units, increase the heat dissipation area of ​​the enameled wire, and ensure the heat dissipation effect.

[0010] As an optimization, in the aforementioned high-voltage paper insulated acetal enameled transposed conductor, the upper surfaces of the A enameled wire and the B enameled wire are coated with self-adhesive paint. The self-adhesive paint can help the two adjacent enameled wires to adhere to each other, so that the entire transposed wire core becomes a whole, thereby increasing the deformation resistance of the transposed conductor, and at the same time can better control the volume of the transposed conductor. Furthermore, the length of the self-adhesive paint can be 1 / 4 to 1 / 2 of the length of the long side in the cross section of the enameled wire. At this time, the amount of self-adhesive paint can be reduced, the production cost can be reduced, and the overflow of excessive self-adhesive paint can be avoided while satisfying the self-adhesive connection of the enameled wire.

[0011] As an optimization, in the aforementioned high-voltage paper-insulated acetal enameled transposed conductor, the thickness of the acetal paint layer can be 0.07mm to 0.1mm; the coating thickness of the self-adhesive paint can be 0.02mm to 0.05mm. In actual production, the thickness of the acetal paint layer and the self-adhesive paint needs to be designed to be thinner, so as to reduce the volume of the transposed conductor and reduce the loss of the transformer while ensuring the performance of the transposed conductor.

[0012] As an optimization, in the aforementioned high-voltage paper-insulated acetal enameled transposed conductor, the cross-sectional shape of the copper flat wire is a rectangle with rounded corners. After the four corners of the copper flat wire are rounded, the sharp corners are removed, which can prevent multiple copper flat wires from abrading each other after being stacked, causing the acetal lacquer layer to be worn thin, affecting the normal operation of the transposed conductor. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the structure of the high-voltage resistant paper insulated acetal enameled transposed conductor in Example 1 of the present application;

[0014] Figure 2 It is a schematic diagram of the structure of the cutting line in this application;

[0015] Figure 3 It is a structural schematic diagram of the high-voltage resistant paper insulated acetal enameled transposed conductor in Example 2 of the present application.

[0016] The markings in the attached drawings are: 1- transposed wire core, 11-A enameled wire, 12-B enameled wire, 13-C enameled wire, 101- copper flat wire, 102- acetal paint layer, 103- self-adhesive paint; 2- insulating paper; 3- cutting wire, 301- limiting part; 4- insulating lining paper. DETAILED DESCRIPTION

[0017] The present application is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present application.

[0018] See also Figure 1 and Figure 2 , a high-voltage resistant paper insulated acetal enameled transposed conductor, comprising a transposed wire core 1, and a multi-layer insulating paper 2 wrapped around the outside of the transposed wire core 1; the transposed wire core 1 comprises an A enameled wire unit and a B enameled wire unit symmetrically arranged, and a C enameled wire 13 arranged at the top center of the A enameled wire unit and the B enameled wire unit, and transposed in the same direction along the narrow surface above and below the A enameled wire unit and the B enameled wire unit; the A enameled wire unit is formed by a group of A enameled wires 11 stacked and placed; the B enameled wire unit is formed by a group of B enameled wires 12 stacked and placed; the C enameled wire 13 is overlapped with the A enameled wire 11 and the B enameled wire 12 located at the top layer respectively; the The A enameled wire 11, the B enameled wire 12 and the C enameled wire 13 all include a copper flat wire 101, and the outer surface of the copper flat wire 101 is coated with an acetal paint layer 102; a cutting line 3 is provided between the side of the A enameled wire unit and / or the B enameled wire unit and the insulating paper 2; the cutting line 3 is arranged along the length direction of the copper flat wire 101; and limiting parts 301 are respectively provided at both ends of the cutting line 3, and the limiting parts 301 are stuck on the outside of the end of the A enameled wire 11 or the B enameled wire 12 (the gap between the side of the enameled wire unit and the insulating paper 2 is relatively small, and the limiting part 301 is easy to get stuck and does not need to be designed to be very large, so that the cutting line 3 can also be designed to be thinner). When recycling the transposed conductor, you can first tear off the insulating paper 2 at the end a little, pinch the limiting part 301 at the end of the cutting line 3 (you can pinch it by hand or use a tool), pull the cutting line 3 apart, and then cut the insulating paper 3. The insulating paper 3 can then be torn off by the staff, which is very convenient to operate.

[0019] Embodiment 1:

[0020] In this embodiment, a cutting line 3 is provided between the side of the B enameled wire unit (or the A enameled wire unit) and the insulating paper 2. The wire diameter of the cutting line 3 is 0.12 mm. At this time, the strength of the cutting line 3 can be ensured, and the volume of the cutting line 3 is small, occupying less space. Furthermore, the cutting line 3 is made of polymer polyethylene fiber material. The polymer polyethylene fiber has high strength, low density, good insulation, good fatigue resistance and load-bearing capacity, so that the breaking force of the cutting line 3 is relatively high.

[0021] In this embodiment, an insulating lining paper 4 is provided between the A enameled wire unit and the B enameled wire unit. The design of the insulating lining paper 4 can separate the two enameled wire units, so as to avoid collision between the two rows of enameled wires during the process of winding the transformer coil with the transposed wire, resulting in the acetal paint layer being worn through and affecting the insulation performance; and can also form a gap between the two enameled wire units, increase the heat dissipation area of ​​the enameled wire, and ensure the heat dissipation effect. The insulating lining paper is power insulating paper.

[0022] In this embodiment, the upper surfaces of the A enameled wire 11 and the B enameled wire 12 are coated with self-adhesive paint 103. The self-adhesive paint 103 can help the two adjacent enameled wires to adhere to each other, so that the entire transposed wire core 1 becomes a whole, thereby increasing the deformation resistance of the transposed wire, and at the same time can better control the volume of the transposed wire. Furthermore, the length of the self-adhesive paint 103 between the two adjacent A enameled wires 11 and the two adjacent B enameled wires 12 is 1 / 3 of the length of the long side of the enameled wire cross section; the length of the self-adhesive paint 103 between the C enameled wire 13 and the A enameled wire 11, and between the C enameled wire 13 and the B enameled wire 12 is 1 / 4 of the length of the long side of the enameled wire cross section. At this time, the amount of self-adhesive paint can be reduced, the production cost can be reduced, and the overflow of excessive self-adhesive paint can be avoided.

[0023] In this embodiment, the thickness of the acetal paint layer 102 is 0.08 mm, and the coating thickness of the self-adhesive paint 103 is 0.03 mm. At this time, the thickness of the acetal paint layer 102 and the self-adhesive paint 103 are relatively thin, which makes the volume of the transposed conductor smaller while ensuring the performance of the transposed conductor.

[0024] In this embodiment, the cross-section of the copper flat wire 101 is a rectangle with rounded corners. After the four corners of the copper flat wire 101 are rounded, the sharp corners are removed, which can prevent the multiple copper flat wires 101 from abrading each other after being stacked, causing the acetal paint layer 102 to be worn thin, affecting the normal operation of the transposed conductor.

[0025] Embodiment 2:

[0026] See also Figure 3 , which is different from the embodiment 1, in this embodiment, cutting wires 3 are provided between the side of the A enameled wire unit and the B enameled wire unit and the insulating paper 2. Thus, when one of the cutting wires 3 is damaged or broken, the other cutting wire 3 can be used to cut the insulating paper 2.

[0027] The above general description of the utility model involved in this application and the description of its specific implementation methods should not be understood as limiting the technical solutions of the utility model. Based on the disclosure of this application, those skilled in the art can, without violating the constituent elements of the utility model involved, add, reduce or combine the disclosed technical features in the above general description or / and the specific implementation methods (including examples) to form other technical solutions within the protection scope of this application.

Claims

1. A high voltage resistant paper insulated acetal enameled transposed conductor, comprising a transposed wire core (1) and a plurality of layers of insulating paper (2) wrapped around the transposed wire core (1); characterized in that: The transposed wire core (1) comprises an A enameled wire unit and a B enameled wire unit which are symmetrically arranged, and a C enameled wire (13) which is arranged at the center of the top of the A enameled wire unit and the B enameled wire unit, and is transposed in the same direction along a narrow surface above and below the A enameled wire unit and the B enameled wire unit; the A enameled wire unit is formed by a group of A enameled wires (11) stacked and placed; the B enameled wire unit is formed by a group of B enameled wires (12) stacked and placed; the C enameled wire (13) is overlapped with the A enameled wire (11) and the B enameled wire (12) located at the top layer respectively; The A enameled wire (11), the B enameled wire (12) and the C enameled wire (13) all comprise a copper flat wire (101), the outer surface of the copper flat wire (101) being coated with an acetal paint layer (102); a cutting line (3) is provided between the side of the A enameled wire unit and / or the B enameled wire unit and the insulating paper (2); the cutting line (3) is provided along the length direction of the copper flat wire (101); and limiting portions (301) are respectively provided at both ends of the cutting line (3), and the limiting portions (301) are clamped on the outer side of the end of the A enameled wire (11) or the B enameled wire (12).

2. The high voltage resistant paper insulated acetal enameled transposed conductor according to claim 1, characterized in that: Cutting lines (3) are provided between the side portions of the A enameled wire unit and the B enameled wire unit and the insulating paper (2).

3. The high voltage resistant paper insulated acetal enameled transposed conductor according to claim 2, characterized in that: The wire diameter of the cutting wire (3) is 0.1 mm to 0.15 mm.

4. The high voltage resistant paper insulated acetal enameled transposed conductor according to any one of claims 1 to 3, characterized in that: The cutting wire (3) is made of polyethylene fiber material.

5. The high voltage resistant paper insulated acetal enameled transposed conductor according to claim 1, characterized in that: An insulating lining paper (4) is provided between the A enameled wire unit and the B enameled wire unit.

6. The high voltage resistant paper insulated acetal enameled transposed conductor according to claim 1, characterized in that: The upper surfaces of the A enameled wire (11) and the B enameled wire (12) are both coated with self-adhesive paint (103).

7. The high voltage resistant paper insulated acetal enameled transposed conductor according to claim 6, characterized in that: The length of the self-adhesive paint (103) is 1 / 4 to 1 / 2 of the length of the long side in the cross section of the enameled wire.

8. The high voltage resistant paper insulated acetal enameled transposed conductor according to claim 6, characterized in that: The thickness of the acetal paint layer (102) is 0.07 mm to 0.1 mm; the coating thickness of the self-adhesive paint (103) is 0.02 mm to 0.05 mm.

9. The high voltage resistant paper insulated acetal enameled transposed conductor according to claim 1, characterized in that: The cross-sectional shape of the copper flat wire (101) is a rectangle with four rounded corners.

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