Double-layer continuous coil structure, transformer and winding method

Abstract

The invention relates to the technical field of transformer manufacturing, in particular to a double-layer continuous coil structure, a transformer and a winding method.The double-layer continuous coil structure comprises a framework, and a first insulating plate and a second insulating plate are sequentially arranged on the framework in the axial direction; a middle hollow channel is formed between the first insulating plate and the second insulating plate; an upper inner-layer coil, a first interlayer insulating cylinder and an upper outer-layer coil are sequentially arranged on the outer side of the framework above the first insulating plate; a lower inner-layer coil, a second interlayer insulating cylinder and a lower outer-layer coil are sequentially arranged on the outer side of the framework below the second insulating plate; and all the coils are continuous coils. The structure can be achieved through simple stacking and continuous winding, complexity and tedious steps in the wire changing process are reduced, connecting points are fewer, the space utilization rate is higher, and the electrical requirement of the low-voltage side of the split-type transformer can be better met. The problem that an existing double-layer spiral winding cannot meet the electrical requirement of the low-voltage side of a split-type transformer due to the fact that a winding method is difficult and the space utilization rate is low is solved.

Description

Technical Field

[0001] The invention relates to the technical field of transformer manufacturing, and in particular to a double-layer continuous coil structure, a transformer and a winding method. Background Art

[0002] A power transformer is a device used to convert a certain value of AC voltage (current) into another or several different values ​​of voltage (current) with the same frequency. It works based on the law of electromagnetic induction. When the input coil is energized, the magnetic field generated will be transmitted to the output coil through the iron core and induce electromotive force in the output coil. According to the ratio of the number of turns of the coil, the transformer can increase or decrease the input voltage to the required output voltage. Therefore, the main function of the power transformer is to realize voltage conversion, current conversion and impedance conversion, etc., to meet the needs of different electrical equipment. Through voltage conversion, long-distance transmission of electric energy, reasonable distribution of electric energy and effective utilization of electric energy can be achieved. In addition, power transformers also have multiple functions such as power transmission, system connection, overload protection, short-circuit protection, harmonic suppression, electromagnetic compatibility, energy saving and consumption reduction. It is widely used in power systems, industry, agriculture, transportation, communications, and construction. In the power system, it is a necessary equipment for power transmission and distribution, and power distribution to power users; in the industrial field, it is often used to power various electrical equipment and production lines; in the field of transportation and communication, it is used to ensure the stable operation of traffic signals and communication equipment.

[0003] Power transformers can be divided into many types according to their uses and characteristics, such as step-up transformers, step-down transformers, current transformers, voltage transformers, etc. Split power transformers, also known as split transformers, are a special type of multi-winding power transformers, which refers to a multi-winding power transformer consisting of one high-voltage winding and two or more low-voltage windings with the same voltage and capacity per phase. The high-voltage side of the split transformer has only one winding, while the low-voltage side has two or more windings with the same voltage, impedance, capacity, and connection group. These low-voltage windings are electrically separated, but the current is transmitted through magnetic coupling. The working principle of the split transformer is similar to that of an ordinary transformer, both of which are based on the principle of electromagnetic induction, but the split type is when the high-voltage winding is energized, the magnetic field generated will pass through the iron core and be induced into the low-voltage winding, thereby generating an electromotive force in the low-voltage winding. Since the low-voltage windings are electrically separated, they can output voltage and current independently without affecting each other. Because of this, when one winding of the split transformer fails, the other windings can continue to supply power, which has high power supply reliability of the power system. Split transformers are widely used in power systems, especially in situations where short-circuit current needs to be limited and power supply reliability needs to be improved. For example, in high-voltage power systems such as power plants and substations, split transformers can effectively protect the safety of power equipment and transmission lines; in distribution networks, split transformers can improve power supply reliability and reduce the risk of power outages caused by faults. Therefore, split power transformers have broad application prospects in power systems. Their unique structure and functions enable them to improve the flexibility and safety of the system while ensuring the stability of power transmission. With the continuous advancement of new energy power generation and smart grid construction, the application of split power transformers will become more extensive and in-depth.

[0004] The windings of existing split transformers are usually double-layer double-helix windings, which are usually suitable for occasions with fewer turns and lower voltages. Split power transformers usually have two or more output voltage levels, which are achieved by split windings. The split windings are designed to meet different power needs and ensure the stable operation of the power system. In split power transformers, the low-voltage winding has a much larger number of coil turns than the same type of windings due to its higher voltage. If a double-layer double-helix winding is used directly, and a multi-layer spiral or multi-layer cylindrical winding method is used, the transformer amplitude will be particularly large, which will lead to the problem of excessively large transformer amplitude dimensions and difficulty in winding, and may not meet electrical performance requirements. Summary of the invention

[0005] In view of the problem that the double-layer spiral winding existing in the prior art cannot meet the electrical requirements of the low-voltage side of the split transformer due to the difficult winding method and low space utilization, the present invention provides a double-layer continuous coil structure, a transformer and a winding method.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: The present invention provides a double-layer continuous coil structure, comprising a skeleton, wherein a first insulating plate and a second insulating plate are sequentially arranged in the axial direction of the skeleton; an intermediate air channel is formed between the first insulating plate and the second insulating plate; an upper inner coil, a first interlayer insulating cylinder and an upper outer coil are sequentially arranged on the outer side of the skeleton above the first insulating plate; a lower inner coil, a second interlayer insulating cylinder and a lower outer coil are sequentially arranged on the outer side of the skeleton below the second insulating plate; the upper inner coil, the upper outer coil, the lower inner coil and the lower outer coil are all continuous coils, and insulating layers are arranged at both ends of all coils; the outlet end of the upper inner coil passes through the first interlayer insulating cylinder to be connected to the inlet end of the upper outer coil; the outlet end of the lower inner coil passes through the second interlayer insulating cylinder to be connected to the inlet end of the lower outer coil.

[0007] Optionally, the first insulating plate is arranged in parallel with the second insulating plate.

[0008] Optionally, a plurality of first support bars are circumferentially arranged between the upper inner layer coil and the first interlayer insulating cylinder.

[0009] Optionally, a plurality of second support bars are circumferentially arranged between the first interlayer insulating cylinder and the upper outer layer coil.

[0010] Optionally, a plurality of third support bars are circumferentially arranged between the lower inner layer coil and the second interlayer insulating cylinder.

[0011] Optionally, a plurality of fourth support bars are circumferentially arranged between the second interlayer insulating cylinder and the lower outer layer coil.

[0012] Optionally, the width of the middle empty channel is ≥30 mm.

[0013] Optionally, the frame, the first insulating plate, the second insulating plate, the first interlayer insulating cylinder and the second interlayer insulating cylinder are all made of insulating paper.

[0014] The present invention provides a transformer, comprising the above-mentioned double-layer continuous coil structure.

[0015] The present invention also provides a winding method for the double-layer continuous coil structure as described above, comprising: Lead the wire in from the outer diameter side and wind the lower inner layer coil on the frame from bottom to top; After the lower inner coil is wound, the wire is led out from the outer diameter, and the wire is led out horizontally through the second interlayer insulation cylinder. The wire is led in from the inner diameter side, and the lower outer coil is wound on the second interlayer insulation cylinder in a top-to-bottom order. After the outer coil is wound, the wire is fed in from the outer diameter side, and the upper inner coil is wound on the frame from top to bottom. After the upper inner coil is wound, the wire is led out from the outer diameter, horizontally led out of the upper inner coil through the first interlayer insulating cylinder, and the wire is led in from the inner diameter side. The upper outer coil is wound on the first interlayer insulating cylinder in a bottom-up order to complete the winding of the coil.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a double-layer continuous coil structure, including a skeleton, which serves as a supporting structure to provide stable support for the winding of the coil; a first insulating plate and a second insulating plate are sequentially arranged in the axial direction of the skeleton, and an intermediate air channel is formed between the first insulating plate and the second insulating plate. The arrangement of the first insulating plate and the second insulating plate not only ensures the electrical isolation between the upper and lower layers of the coil, but also provides an additional heat dissipation channel by forming the intermediate air channel, which is helpful for the heat dissipation of the coil. The outer side of the skeleton above the first insulating plate is provided with an upper inner coil, a first interlayer insulating cylinder and an upper outer coil in sequence; the outer side of the skeleton below the second insulating plate is provided with a lower inner coil, a second interlayer insulating cylinder and a lower outer coil in sequence. By arranging an interlayer insulating cylinder between the inner and outer coils, electrical insulation is provided between the coils to ensure the electrical independence between the coils, and at the same time, the electrical performance of the coils can be optimized by adjusting the parameters of the interlayer insulating cylinder; the upper inner coil, the upper outer coil, the lower inner coil and the lower outer coil are all continuous coils. This continuous coil structure improves the electrical performance stability and consistency of the coil and reduces the risk of failure caused by joints. Compared with the double-layer spiral winding structure, this structure can be realized by simple stacking and continuous winding, reducing the complexity and cumbersome steps of the line replacement process, and there are fewer connection points, which reduces the resistance change and inductance loss caused by the joints, and improves the stability and consistency of the electrical performance. At the same time, this coil structure can meet the electrical requirements of the multi-turn coil on the low-voltage side of the split transformer, and has higher space utilization. The setting of the insulation layer at both ends of the coil not only effectively prevents electrical short circuit between the coils, but also provides additional mechanical protection to help increase the service life of the coil.

[0017] The first insulating plate is arranged in parallel with the second insulating plate, providing effective electrical isolation for the upper and lower layers of coils. This isolation ensures that the currents between the coils do not interfere with each other, thereby maintaining the stability and safety of the circuit. The parallel insulating plates provide additional support for the coil structure and enhance the stability of the entire structure. This stability is essential for resisting external vibrations and shocks, and helps to keep the shape and position of the coil unchanged.

[0018] A plurality of first support bars are circumferentially arranged between the upper inner coil and the first interlayer insulating cylinder, which can effectively support the upper inner coil and prevent the coil from being deformed or displaced due to vibration or external force during operation, thereby ensuring the stability and reliability of the coil structure; the circumferentially arranged first support bars can further ensure the insulation distance between the coil and the insulating cylinder, and prevent problems such as insulation performance degradation or short circuit caused by direct contact between the coil and the insulating cylinder. At the same time, the arrangement of the first support bars can increase the gap between the coil and the insulating cylinder to a certain extent, which is beneficial to the dissipation of heat and the flow of coolant, thereby improving the heat dissipation conditions of the coil and improving the operating efficiency and service life of the transformer.

[0019] A plurality of second support bars are arranged circumferentially between the first interlayer insulating cylinder and the upper outer coil. The arrangement of the second support bars can significantly improve the structural stability of the upper outer coil and prevent the coil from being deformed due to vibration or external force during operation, thereby ensuring the geometric shape and dimensional accuracy of the coil. The circumferentially arranged second support bars provide additional support to the insulating cylinder, which helps prevent the insulating cylinder from being deformed or damaged due to uneven force during the operation of the transformer. At the same time, the arrangement of the second support bars can further improve the heat dissipation performance of each part of the coil.

[0020] A plurality of third support bars are circumferentially arranged between the lower inner coil and the second interlayer insulating cylinder. The arrangement of the third support bars can not only effectively support the lower inner coil and prevent the coil from being deformed or displaced due to vibration or external force during operation, but also further ensure the insulation distance between the coil and the insulating cylinder, prevent problems such as insulation performance degradation or short circuit caused by direct contact between the coil and the insulating cylinder, and at the same time, improve the heat dissipation capacity of the coil.

[0021] A plurality of fourth support bars are circumferentially arranged between the second interlayer insulating cylinder and the lower outer layer coil. The arrangement of the fourth support bars, in addition to providing corresponding stable support, can also further enhance the heat dissipation and insulation capabilities of the coil.

[0022] The width of the intermediate air channel is ≥30mm. Sufficient air channel width can effectively prevent breakdown between the high-voltage side and the low-voltage side due to electrical contact or arc discharge. This helps protect the equipment from electrical damage and reduces the risk of safety accidents caused by electrical failures. At the same time, sufficient air channel width helps dissipate heat and flow of coolant, thereby improving the heat dissipation conditions of the transformer, helping to reduce the operating temperature of the equipment and improve the thermal stability and reliability of the transformer.

[0023] The skeleton, the first insulating plate, the second insulating plate, the first interlayer insulating cylinder and the second interlayer insulating cylinder are all made of insulating paper. The insulating paper has excellent electrical insulation properties, can effectively isolate the high-voltage and low-voltage parts, and prevent current leakage and electrical breakdown. In the transformer, these components made of insulating paper play a vital role in ensuring the electrical safety and stable operation of the equipment. At the same time, the transformer will generate a lot of heat during operation, so the insulating material is required to have good thermal stability. The insulating paper can withstand high temperatures without losing its insulating properties, which helps to ensure the safe operation of the transformer in a high temperature environment. In addition, the insulating paper also has good mechanical properties, moisture resistance, environmental protection, low cost, can maintain stable insulation performance in a humid environment, can withstand the vibration and impact of the transformer during transportation, installation and operation, and improve the reliability and service life of the equipment.

[0024] A transformer includes the above-mentioned double-layer continuous coil structure. The double-layer continuous coil structure may help to distribute current more evenly in a split transformer, reduce local overheating and current concentration, thereby improving the operating efficiency and stability of the transformer. At the same time, compared with a single-layer coil, the double-layer continuous coil structure can provide more coil turns in the same volume, thereby saving the space occupied by the transformer and reducing installation costs. The transformer has better electrical performance, structural stability and reliability, and has lower manufacturing and maintenance costs.

[0025] The present invention also provides a winding method for a double-layer continuous coil structure as described above, wherein the method comprises: introducing wires from the outer diameter side, and winding a lower inner coil on a skeleton in a bottom-up order; after the winding of the lower inner coil is completed, the wires are led out from the outer diameter, and the wires of the lower inner coil are horizontally led out through a second interlayer insulating cylinder, and the wires are introduced from the inner diameter side, and the lower outer coil is wound on the second interlayer insulating cylinder in a top-down order; after the winding of the outer coil is completed, the wires are introduced from the outer diameter side, and the upper inner coil is wound on the skeleton in a top-down order; after the winding of the upper inner coil is completed, the wires are introduced from the outer diameter side, and the wires of the upper inner coil are horizontally led out through a first interlayer insulating cylinder, and the wires are introduced from the inner diameter side, and the upper outer coil is wound on the first interlayer insulating cylinder in a bottom-up order, thereby completing the winding of the coil. The coil is wound from the inside to the outside and from the bottom to the top, which ensures the precise positioning of the coil on the frame and avoids confusion and errors in the winding process. The method is simple, the winding efficiency is high and the winding accuracy is good, which makes the transformer have better electrical stability and reliability, and provides a strong guarantee for the stable operation of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of a double-layer continuous coil structure of the present invention.

[0027] Figure 2 The present invention is a schematic diagram of the input and output wires of a double-layer continuous coil winding.

[0028] Figure 3 The present invention is a flow chart of a double-layer continuous coil winding method.

[0029] Among them, 1-skeleton, 2-first insulating plate, 3-second insulating plate, 4-middle air channel, 5-upper inner coil, 6-first interlayer insulating tube, 7-upper outer coil, 8-lower inner coil, 9-second interlayer insulating tube, 10-lower outer coil, 11-insulating layer, 12-first support bar, 13-second support bar, 14-third support bar, 15-fourth support bar, 16-external support bar. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0033] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0034] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0035] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] The present invention is further described in detail below in conjunction with specific embodiments, which are intended to explain the present invention rather than to limit it.

[0037] See also Figure 1The present invention discloses a double-layer continuous coil structure, characterized in that it includes a skeleton 1, a first insulating plate 2 and a second insulating plate 3; the first insulating plate 2 and the second insulating plate 3 are arranged in parallel in the axial direction of the skeleton 1, and optionally, the first insulating plate 2 and the second insulating plate 3 are arranged in the axial middle position of the skeleton 1, and an intermediate space 4 is formed between the first insulating plate 2 and the second insulating plate 3, and the width of the intermediate space 4 is greater than 30 mm, preferably 30 mm to 40 mm; an upper inner layer coil 5, a first interlayer insulating cylinder 6 and an upper outer layer coil 7 are sequentially arranged on the outer side of the skeleton 1 above the first insulating plate 2, a plurality of first support bars 12 are circumferentially arranged between the upper inner layer coil 5 and the first interlayer insulating cylinder 6, and a plurality of second support bars 13 are circumferentially arranged between the first interlayer insulating cylinder 6 and the upper outer layer coil 7; the second insulating The outer side of the skeleton 1 below the plate 3 is sequentially provided with a lower inner coil 8, a second interlayer insulating cylinder 9 and a lower outer coil 10, a plurality of third support bars 14 are circumferentially provided between the lower inner coil 8 and the second interlayer insulating cylinder 9, a plurality of fourth support bars 15 are circumferentially provided between the second interlayer insulating cylinder 9 and the lower outer coil 10; a plurality of external support bars 16 are circumferentially provided outside the lower outer coil 10 and the upper outer coil 7; the upper inner coil 5, the upper outer coil 7, the lower inner coil 8 and the lower outer coil 10 are all continuous coils, and insulating layers 11 are provided at both ends of all coils; the outgoing wire end of the upper inner coil 5 passes through the first interlayer insulating cylinder 6 to connect the incoming wire end of the upper outer coil 7; the outgoing wire end of the lower inner coil 8 passes through the second interlayer insulating cylinder 9 to connect the incoming wire end of the lower outer coil 10. Optionally, the skeleton 1, the first insulating plate 2, the second insulating plate 3, the first interlayer insulating tube 6, the second interlayer insulating tube 9, the first support bar 12, the second support bar 13, the third support bar 14, the fourth support bar 15 and the external support bar are all made of insulating paper. The heights of the first support bar 12, the second support bar 13, the third support bar 14, the fourth support bar 15 and the external support bar 16 are all higher than the heights of each coil, which is convenient for assembly.

[0038] The present invention also provides a transformer, including the above-mentioned double-layer continuous coil structure. The double-layer continuous coil structure may help to distribute current more evenly in the split transformer, reduce local overheating and current concentration, thereby improving the operating efficiency and stability of the transformer. At the same time, compared with a single-layer coil, the double-layer continuous coil structure can provide more coil turns in the same volume, thereby saving the space occupied by the transformer and reducing the installation cost. The transformer has better electrical performance, structural stability and reliability, and has lower manufacturing cost and maintenance cost.

[0039] See also Figure 2 and Figure 3The present invention also provides a winding method for the double-layer continuous coil structure as described above, comprising: S1: The wire is fed in from the outer diameter side, and the lower inner layer coil 8 is wound on the frame 1 from bottom to top. Specifically: The lower inner coil 8 and the lower outer coil 10 are placed on the bottom end insulating layer 11, and the wire is introduced from the outer diameter side, and the lower inner coil 8 is wound on the frame 1 in a bottom-up order.

[0040] S2: After the lower inner coil 8 is wound, the wire is led out from the outer diameter, and the wire is led out horizontally through the second interlayer insulation cylinder 9, and the wire is led in from the inner diameter side. The lower outer coil 10 is wound on the second interlayer insulation cylinder 9 in a top-to-bottom order. Specifically: After the winding of the lower inner coil 8 is completed, the outlet of the outer diameter coil of the lower inner coil 8 is made, led out horizontally, the third support bar 14 is placed and tied firmly, the insulating layer 11 at the upper end of the lower inner coil 8 is placed, and the second interlayer insulating tube 9 is placed, so that the outlet of the outer diameter coil of the lower inner coil 8 passes through the second interlayer insulating tube 9, and the fourth support bar 15 is placed and tied firmly; the wire is introduced from the inner diameter side, and the lower outer coil 10 is wound on the fourth support bar 15 in a top-down order.

[0041] S3: After the outer coil 10 is wound, the wire is introduced from the outer diameter side and the upper inner coil 5 is wound on the frame 1 in a top-to-bottom order. Specifically: After the outer coil 10 is wound, the insulating layer 11 is placed on the top of the outer coil 10, and the insulating layer 11 is placed on the lower end of the upper inner coil 5 and the upper outer coil 7. Then, the wire is introduced from the outer diameter side and the upper inner coil 5 is wound on the skeleton 1 in a top-down order.

[0042] S4: After the winding of the upper inner coil 5 is completed, the wire is led out from the outer diameter, and the wire of the upper inner coil 5 is horizontally led out through the first interlayer insulating cylinder 6, and the wire is introduced from the inner diameter side. The upper outer coil 7 is wound on the first interlayer insulating cylinder 6 in a bottom-up order to complete the winding of the coil. Specifically, After the winding of the upper inner coil 5 is completed, the outlet of the outer diameter coil of the upper inner coil 5 is made, led out horizontally, the first support bar 12 is placed and tied firmly, the insulating layer 11 at the upper end of the upper inner coil 5 is placed, and the first interlayer insulating tube 6 is placed, so that the outlet of the outer diameter coil of the upper inner coil 5 passes through the first interlayer insulating tube 9, and the second support bar 13 is placed and tied firmly; the wire is introduced from the inner diameter side, and the upper outer coil 7 is wound on the second support bar 13 in a bottom-up order.

[0043] It should be noted that due to the large number of turns, the coil usually has many turns. When the coil has an odd number of turns, the wire can be fed in from the inner diameter side and out from the outer diameter side, or the wire can be fed in from the outer diameter side and out from the inner diameter side; when the coil has an even number of turns, the wire can be fed in from the inner diameter side and out from the inner diameter side, or the wire can be fed in from the outer diameter side and out from the outer diameter side. The wire feeding and winding can be performed according to the needs, not limited to the above winding order.

[0044] The coil is wound from the inside to the outside and from the bottom to the top, which ensures the precise positioning of the coil on the frame and avoids confusion and errors in the winding process. The method is simple, the winding efficiency is high and the winding accuracy is good, which makes the transformer have better electrical stability and reliability, and provides a strong guarantee for the stable operation of the power system.

[0045] In summary, the present invention provides a double-layer continuous coil structure, a transformer and a winding method, by setting a skeleton, an upper inner coil, an upper outer coil, a lower inner coil and a lower outer coil and other continuous coils, so that the low-voltage side winding of the split transformer adopts a double-layer continuous coil structure. Compared with the double-layer spiral winding structure, this structure can be realized by simple stacking and continuous winding, reducing the complexity and cumbersome steps of the wire changing process, and there are fewer connection points, which reduces the resistance change and inductance loss caused by the joints, and improves the stability and consistency of the electrical performance. At the same time, this coil structure can meet the electrical requirements of the multi-turn coil on the low-voltage side of the split transformer, with higher space utilization, and can better meet the electrical requirements of the low-voltage side of the split transformer.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to impose any limitation on the technical solution of the present invention. Those skilled in the art should understand that, without departing from the spirit and principles of the present invention, the technical solution can also be subjected to several simple modifications and substitutions, and these modifications and substitutions are also within the scope of protection covered by the claims.

Claims

1. A double-layer continuous coil structure, characterized in that: The invention comprises a frame (1), wherein a first insulating plate (2) and a second insulating plate (3) are sequentially arranged in the axial direction of the frame (1); an intermediate air passage (4) is formed between the first insulating plate (2) and the second insulating plate (3); an upper inner layer coil (5), a first interlayer insulating cylinder (6) and an upper outer layer coil (7) are sequentially arranged on the outer side of the frame (1) above the first insulating plate (2); a lower inner layer coil (8), a second interlayer insulating cylinder (6) and an upper outer layer coil (7) are sequentially arranged on the outer side of the frame (1) below the second insulating plate (3); The upper inner layer coil (5), the upper outer layer coil (7), the lower inner layer coil (8) and the lower outer layer coil (10) are all continuous coils, and both ends of all coils are provided with insulating layers (11); the outlet end of the upper inner layer coil (5) passes through the first interlayer insulating cylinder (6) to connect to the inlet end of the upper outer layer coil (7); the outlet end of the lower inner layer coil (8) passes through the second interlayer insulating cylinder (9) to connect to the inlet end of the lower outer layer coil (10).

2. The double-layer continuous coil structure according to claim 1, characterized in that: The first insulating plate (2) and the second insulating plate (3) are arranged in parallel.

3. The double-layer continuous coil structure according to claim 1, characterized in that: A plurality of first support bars (12) are arranged circumferentially between the upper inner layer coil (5) and the first interlayer insulating cylinder (6).

4. The double-layer continuous coil structure according to claim 1, characterized in that: A plurality of second support bars (13) are arranged circumferentially between the first interlayer insulating cylinder (6) and the upper outer layer coil (7).

5. The double-layer continuous coil structure according to claim 1, characterized in that: A plurality of third support bars (14) are arranged circumferentially between the lower inner layer coil (8) and the second interlayer insulating cylinder (9).

6. The double-layer continuous coil structure according to claim 1, characterized in that: A plurality of fourth support bars (15) are arranged circumferentially between the second interlayer insulating cylinder (9) and the lower outer layer coil (10).

7. The double-layer continuous coil structure according to claim 1, characterized in that: The width of the intermediate empty channel (4) is ≥30 mm.

8. The double-layer continuous coil structure according to any one of claims 1 to 7, characterized in that: The frame (1), the first insulating plate (2), the second insulating plate (3), the first interlayer insulating cylinder (6) and the second interlayer insulating cylinder (9) are all made of insulating paper.

9. A transformer, characterized in that: It comprises the double-layer continuous coil structure as described in any one of claims 1-8.

10. The winding method of the double-layer continuous coil structure according to any one of claims 1 to 8, characterized in that: include: The wire is introduced from the outer diameter side, and the lower inner layer coil (8) is wound on the frame (1) in a bottom-to-top order; After the lower inner coil (8) is wound, the wire is led out from the outer diameter, the wire is led out horizontally through the second interlayer insulating cylinder (9), and the wire is led in from the inner diameter side, and the lower outer coil (10) is wound on the second interlayer insulating cylinder (9) in a top-to-bottom order; After the outer layer coil (10) is wound, the wire is introduced from the outer diameter side and the upper inner layer coil (5) is wound on the frame (1) in a top-to-bottom order; After the winding of the upper inner layer coil (5) is completed, the wire is led out from the outer diameter, the wire of the upper inner layer coil (5) is horizontally led out through the first interlayer insulating cylinder (6), and the wire is led in from the inner diameter side. In a bottom-up order, the upper outer layer coil (7) is wound on the first interlayer insulating cylinder (6), thereby completing the winding of the coil.

Images