Method for winding a multi-tapped layer type single coil, layer type single coil and transformer

Abstract

The present invention provides a method for winding a multi-tapped layer type single coil, a layer type single coil and a transformer, which relates to the technical field of transformer manufacturing. The layer type single coil is wound with a single wire. The winding directions of the wires of the first n-1 layers of coils are the same. The (n-1)th layer takes several winding turns as tapping points to lead out taps, and the original wire continues to wind, and several taps are led out in total. When winding the nth layer of coil, the single wire is disconnected and wound in the opposite winding direction to ensure that the magnetic flux directions generated by the currents of the wires of the first n-1 layers and the nth layer are the same. Taking several winding turns as tapping points to lead out taps, and the original wire continues to wind until reaching the other end of the winding device, and finally a tap is led out. There is no insulation distance inside the coil between tap X2 and tap X3, and there is only insulation distance outside the coil. The insulation distance naturally increases, reducing the coil size and the core weight, reducing the noise and loss of the transformer, and the winding process is simple.

Description

Technical Field

[0001] The present invention relates to the technical field of transformer manufacturing, and more specifically, to a method for winding a multi-tapped layer type single coil, a layer type single coil, and a transformer. Background Art

[0002] Layer type coils are widely used in distribution transformers below 630 kVA. Their compact cylindrical structure and high filling factor can optimize the utilization rate of the iron core window, effectively reduce no-load losses and improve heat dissipation efficiency. Moreover, compared with traditional pancake coils, layer type coils do not require complex transposition and welding processes, and the winding efficiency is improved. Electrically, layer type coils can achieve the function of voltage regulation by leading out multiple taps, adjusting the number of turns of the winding to optimize the voltage output, so as to adapt to grid fluctuations, load changes, and improve equipment performance.

[0003] Currently, on the high-voltage side of transformers with a voltage level of 35 kV and above, to prevent insulation aging or partial discharge, sectional layer type coils are generally used for winding the windings. The coil is divided into several independent sections (such as the upper and lower sections), the winding directions of each section are opposite or a transposition process is adopted, and an insulating layer or oil duct is used to isolate between the sections, which can balance the ampere-turn distribution, reduce the short-circuit electrodynamic force generated by the leakage magnetic field, and avoid axial deformation or inter-turn short circuit of the coil. In the sectional layer type transformers disclosed in the prior art, the high-voltage coil is divided into the upper and lower parts, and the taps are respectively located at the ends of the two sections and are connected by an external voltage regulating switch, effectively reducing the working voltage between layers. However, in such a sectional layer type coil, if taps are respectively led out from the upper half and the lower half of the high-voltage coil, because it is sectional winding, there are break points between adjacent taps, and the break points are inside the coil. The break points make the ampere-turns (current × number of turns) in different tap areas unable to cancel each other out, and the un-canceled magnetomotive force will intensify the leakage magnetic flux and reduce the short-circuit resistance.

[0004] When winding the winding coils of distribution transformers with a voltage of 10 kV and below, because the current is large but the voltage is low, a complex tap structure is not required, and layer type single coils are generally used, which can be continuously wound without transposition or segmentation, and the degree of automation is high. Currently, on the market, the layer type single coils of transformers are wound in a continuous manner, and the winding directions of all layers are the same, such as Figure 1The existing layer-type single-coil structure shown is composed of 1 wire wound for 11 layers to form a single coil with a total of 11 layers. In all layers, the wire winding direction is the same. Taking the A phase of the three-phase winding as an example, starting from the winding starting point, the first 10 layers are separated by insulating materials (such as insulating paper, the numbers represent the layers of insulating paper) or oil ducts (such as between the 6th and 7th layers, and between the 8th and 9th layers). A tap X6 is led out from the 10th layer, and a total of 5 taps, namely X2, X3, X4, X5, and X7, are led out from the 11th layer. Five coil tapping positions are formed between the taps. Among them, the connection between tap X2 and tap X3 obtains coil tapping position 1, the connection between tap X3 and tap X4 obtains coil tapping position 2, the connection between tap X4 and tap X5 obtains coil tapping position 3, the connection between tap X5 and tap X6 obtains coil tapping position 4, and the connection between tap X6 and tap X7 obtains coil tapping position 5. The 10th and 11th layers of the coil are connected together. When transitioning from the 10th layer to the 11th layer, the coil needs to rise a layer, and a scissor mouth will be formed when winding the wire at the rising layer position. The wire at the scissor mouth position needs to be wrapped with insulation. If the insulation process is not well done, or there is a sudden short circuit outside the transformer, when the coil bears a large mechanical stress, it is easy to cause insulation damage at the scissor mouth, leading to coil short circuit, and thus causing the transformer to burn out and power outage. As Figure 2 shown, there is a floating voltage between tap X2 and tap X3 of the coil. Therefore, inside the coil, sufficient electrical distance must be left between tap X2 and tap X3. If the wire here deflects during the operation of the transformer, but the insulation distance is not enough, insulation breakdown is likely to occur, which will also cause the transformer to burn out and power outage. At the same time, due to the existence of this insulation distance here, the coil size increases, increasing the length and weight of the wire, and increasing the resistance loss of the coil. See Figure 1 , when at coil tapping position 5, at this time tap X6 is connected to tap X7, and all the turns of the wire in the last layer, the 11th layer of the coil, are disconnected. When there is a sudden short circuit outside the transformer, the mechanical force of the coil increases, and the ability of the coil to withstand sudden short circuits is poor. Summary of the Invention

[0005] To solve the problems that in the existing layer-type single coil with multiple taps during winding, the electrical distance requirements between taps are high, the insulation distance is large, resulting in a large coil size, and to solve the problem that the transformer using the existing layer-type single coil with multiple taps has poor short-circuit withstand ability, the present invention proposes a winding method for a layer-type single coil with multiple taps, a layer-type single coil, and a transformer. The winding process is simple, safe and reliable. Sufficient insulation distance is naturally formed between taps in the formed layer-type single coil, reducing the coil size and improving the performance of the transformer.

[0006] To achieve the above technical effects, the technical solution of the present invention is as follows:

[0007] In a first aspect, the present application proposes a method for winding a multi-tap laminated single coil, comprising the following steps:

[0008] S1: Let the total number of layers of the laminated single coil to be wound be n, and the layer sequence number of the wound single coil be i, where both i and n are positive integers. Let i = 1;

[0009] S2: Take any end of a single wire as the coil starting end, and use it as the starting point for winding. Start from one end of the winding device, and wind successively in the winding groove of the winding device until reaching the other end of the winding device;

[0010] S3: Ascend from the i-th layer to the (i + 1)-th layer of the wound coil. Start from one end of the winding device, and use the same winding direction as the i-th layer to wind successively in the winding groove of the winding device until reaching the other end of the winding device, thus completing the winding of the (i + 1)-th layer of the coil;

[0011] S4: Determine whether i is less than n - 2. If so, increase the value of i by 1, and return to execute step S3. Otherwise, ascend from the (n - 2)-th layer to the (n - 1)-th layer of the wound coil, and execute S5;

[0012] S5: Start winding the (n - 1)-th layer: Start from one end of the winding device, and use the same winding direction as the (n - 2)-th layer to wind successively in the winding groove of the winding device. Use several winding turns as tapping points to lead out taps, continue winding with the original wire, then use several winding turns as tapping points to lead out another tap, and lead out several taps in total until reaching the other end of the winding device. Finally, lead out a tap, complete the winding, and cut off the end of the last led-out tap;

[0013] S6: Take one end of the remaining single wire after cutting as a tap. After reserving the tap length, start from one end of the winding device with the remaining single wire, and wind successively in the winding groove of the winding device in a winding direction opposite to the previous (n - 1) layers;

[0014] S7: Use several winding turns as tapping points to lead out taps, continue winding with the original wire, then use several winding turns as tapping points to lead out another tap, and lead out several taps in total until reaching the other end of the winding device. Finally, lead out a tap as the coil end.

[0015] Preferably, in step S2, any end of the single wire as the winding starting end is any one of coil starting ends A, B, or C. In S7, the last led-out tap is any one of coil ends X, Y, or Z. Among them, if the coil starting end is A, the coil end is X; if the coil starting end is B, the coil end is Y; if the coil starting end is C, the coil end is Z.

[0016] Preferably, the wire starts from one end of the winding device and is successively wound in the winding grooves of the winding device until it reaches the other end of the winding device, forming one layer of the winding coil.

[0017] Preferably, the layer elevation is that after the i-th layer is wound and before the (i + 1)-th layer is wound, the wire that ends the i-th layer directly makes a sequential transition from the end of the winding device where it is currently located to the (i + 1)-th layer without changing the position of the end of the winding device, where i is less than n - 2.

[0018] In a second aspect, the present application also proposes a multi-tapped layer-type single coil, which is wound by using the above-mentioned winding method of the multi-tapped layer-type single coil. The number of layers of the layer-type single coil is n. The first layer starts from any end of a single wire as the winding starting point and starts from one end of the winding device, and is successively wound in the winding grooves of the winding device until it reaches the other end of the winding device;

[0019] When winding the first n - 2 layers of the layer-type single coil, after the i-th layer is wound, the wire ascends from the i-th layer of the winding coil to the (i + 1)-th layer. Starting from one end of the winding device, using the same winding direction as the i-th layer, it is successively wound in the winding grooves of the winding device until it reaches the other end of the winding device, completing the winding of the (i + 1)-th layer of the coil, where i is greater than 1 and less than n - 2;

[0020] When winding the (n - 1)-th layer of the layer-type single coil, starting from one end of the winding device, using the same winding direction as the (n - 2)-th layer, it is successively wound in the winding grooves of the winding device, and taking several winding turns as tapping points to lead out taps. The original wire continues to wind, and then taking several winding turns as tapping points to lead out another tap, a total of several taps are led out until it reaches the other end of the winding device, and finally a tap is led out. After winding is completed, the end of the finally led-out tap is cut off;

[0021] When winding the n-th layer of the layer-type single coil, one end of the remaining single wire after cutting is used as a tap. After reserving the tap length, the remaining single wire starts from one end of the winding device and uses the winding direction opposite to the first n - 1 layers, and is successively wound in the winding grooves of the winding device, and taking several winding turns as tapping points to lead out taps. The original wire continues to wind, and then taking several winding turns as tapping points to lead out another tap, a total of several taps are led out until it reaches the other end of the winding device, and finally a tap is led out as the end of the coil.

[0022] Preferably, according to the interlayer working voltage, interlayer insulation is provided between the i-th layer and the (i + 1)-th layer of the layer-type single coil.

[0023] Preferably, several taps led out from the (n - 1)-th layer are located on the outer side of the (n - 1)-th layer and are radially led out, and several taps led out from the n-th layer are located on the outer side of the n-th layer and are radially led out.

[0024] Preferably, in the order of leading out during the winding process, several taps led out from the (n - 1)-th layer are successively tap X6, tap X4, and tap X2, and several taps led out from the n-th layer are successively tap X3, tap X5, and tap X7. Finally, a tap is led out as the end X of the coil. The layer-type single coil forms 5 coil tapping positions by taps, including: tap X2 - tap X3, tap X3 - tap X4, tap X4 - tap X5, tap X5 - tap X6, tap X6 - tap X7. Among them, tap X2 is at the upper end of the layer-type coil, tap X3 is at the lower end of the layer-type coil, and tap X6 - tap X7 is the minimum tapping position of the coil.

[0025] In a third aspect, the present application proposes a transformer. The winding of the transformer is a layer-type single coil formed by winding a single wire with multiple taps, and the single wire is wound into a layer-type single coil by using the layer-type single coil winding method with multiple taps.

[0026] Compared with the prior art, the beneficial effects of the present invention are:

[0027] The present invention proposes a layer-type single coil winding method with multiple taps, a layer-type single coil, and a transformer. By winding a layer-type single coil with a single wire, the winding directions of the wires of the first (n - 1) layers of the coil are the same. The (n - 1)-th layer uses several winding turns as tapping points to lead out taps, and the original wire continues to wind. Then, several winding turns are used as tapping points to lead out another tap, and several taps are led out in total until the other end of the winding device is wound. When winding the n-th layer of the coil, the single wire is disconnected, and the n-th layer of the coil is wound in the opposite winding direction to ensure that the magnetic flux directions generated by the currents of the wires of the first (n - 1) layers and the n-th layer are the same. Several winding turns are used as tapping points to lead out taps, and the original wire continues to wind. Then, several winding turns are used as tapping points to lead out another tap, and several taps are led out in total until the other end of the winding device is wound. Finally, a tap is led out, so that there is no insulation distance between the coil taps inside the coil, and there is only an insulation distance outside the coil. The insulation distance naturally increases, the coil size is reduced, the winding process is simple, safe and reliable, the problem that the transformer with a layer-type single coil with multiple taps in the prior art has poor short-circuit withstand ability is solved, and the performance of the transformer is improved. Description of the Drawings

[0028] Figure 1 A schematic diagram showing the existing layer-type single coil proposed in the background art of the present invention;

[0029] Figure 2It shows the circuit schematic diagram after the layered single coil proposed in the background art of the present invention is unfolded;

[0030] Figure 3 It shows the schematic flow chart of the winding method of the layered single coil with multiple taps proposed in Embodiment 1 of the present invention;

[0031] Figure 4 It shows the schematic diagram of the layered single coil wound by using the winding method of the layered single coil with multiple taps proposed in Embodiment 1 of the present invention;

[0032] Figure 5 It shows the circuit schematic diagram after the layered single coil wound by using the winding method of the layered single coil with multiple taps proposed in Embodiment 1 of the present invention is unfolded. Detailed implementation manners

[0033] The drawings are only for illustrative purposes and should not be construed as a limitation to this application;

[0034] For better illustration of this embodiment, some parts of the drawings are omitted, enlarged or reduced, and do not represent the actual size;

[0035] For those skilled in the art, it is understandable that some well-known content descriptions in the drawings may be omitted.

[0036] The technical solutions of the present invention will be further described below in conjunction with the drawings and embodiments.

[0037] The descriptions of the positional relationships in the drawings are only for illustrative purposes and should not be construed as a limitation to this application;

[0038] Embodiment 1

[0039] As Figure 3 shown, this embodiment proposes a winding method of a layered single coil with multiple taps, including the following steps:

[0040] S1: Assume that the total number of layers of the layered single coil to be wound is n, the layer sequence number of the wound single coil is i, both i and n are positive integers, and let i = 1;

[0041] S2: Take any end of a single wire as the coil head end and use it as the winding starting point. Start from one end of the winding tool and wind successively in the winding groove of the winding tool until reaching the other end of the winding tool;

[0042] S3: Ascend from the i-th layer to the (i + 1)-th layer of the wound coil. Start from one end of the winding tool and wind successively in the winding groove of the winding tool in the same winding direction as the i-th layer until reaching the other end of the winding tool to complete the winding of the (i + 1)-th layer of the coil;

[0043] S4: Determine whether i is less than n - 2. If so, increment the value of i by 1, and return to execute step S3. Otherwise, ascend from the (n - 2)-th layer to the (n - 1)-th layer of the wound coil, and execute S5;

[0044] S5: Start winding the (n - 1)-th layer: Starting from one end of the winding device, using the same winding direction as the (n - 2)-th layer, wind successively in the winding grooves of the winding device, and taking several winding turns as tap points, lead out taps. The original wire continues to wind, and then taking several winding turns as tap points, lead out another tap. A total of several taps are led out until winding reaches the other end of the winding device. Finally, lead out a tap, complete the winding, and cut off the end of the last led-out tap;

[0045] S6: Take one end of the remaining single wire after cutting as a tap. After reserving the tap length, the remaining single wire starts from one end of the winding device and winds successively in the winding grooves of the winding device using the winding direction opposite to the previous (n - 1) layers;

[0046] S7: Take several winding turns as tap points, lead out taps. The original wire continues to wind, and then taking several winding turns as tap points, lead out another tap. A total of several taps are led out until winding reaches the other end of the winding device. Finally, lead out a tap as the coil end.

[0047] In this embodiment, one end of the winding device can be the upper end or the lower end of the winding device. In step S2, any end of the single wire as the winding starting point is any one of the coil heads A, B, or C of the coil. In S7, the last led-out tap is any one of the coil ends X, Y, or Z. Among them, if the coil head is A, the coil end is X; if the coil head is B, the coil end is Y; if the coil head is C, the coil end is Z. As Figure 4 shown, one end of the single wire as the winding starting point is the coil head A of the three-phase winding. The wound coil in this embodiment has 11 layers. Refer to Figure 4 and the wire starts from one end of the winding device and winds successively from top to bottom along the winding grooves of the winding device until reaching the other end of the winding device, forming one layer of the wound coil.

[0048] In this embodiment, the layer ascending means that after the i-th layer winding is completed and before starting the (i + 1)-th layer winding, the wire at the end of the i-th layer winding directly makes a sequential transition from the end of the winding device where it is currently located to the (i + 1)-th layer without performing end position swapping of the winding device. i is less than n - 2, that is, in the first 10 layers, it ascends by sequential transition. In specific implementation, after the i-th layer winding is completed, place insulating paper between layers, do not cut the wire, and adopt a spiral ascending sequence. When winding from the last turn of the i-th layer wire to the edge of the other end, guide the wire to the starting position of the (i + 1)-th layer while keeping the winding direction consistent.

[0049] Combination Figure 4 , when winding the first 10 layers of coils, first take any end of a single wire as the coil starting end, and use it as the winding starting point. Start from one end of the winding device (see Figure 4 , which is the upper end of the winding device, and the coil starting end is A), and wind in the winding groove of the winding device in sequence until reaching the other end of the winding device (which is the lower end of the winding device). Ascend from the first layer to the second layer of the wound coil. Start from the lower end of the winding device, adopt the same winding direction as the first layer, and wind in the winding groove of the winding device in sequence until reaching the upper end of the winding device to complete the winding of the second layer of the coil. The other layers are similar and will not be elaborated.

[0050] When starting to wind the 10th layer of the coil, use several winding turns as tapping points to lead out taps. As Figure 4 shown, first lead out tap X6, continue to wind the original wire, then use several winding turns as tapping points to lead out another tap X4, and lead out several taps in total until reaching the other end of the winding device. Finally, lead out a tap X2, complete the winding, and cut off the end of the last lead-out tap.

[0051] See Figure 4 , take one end of the remaining single wire after cutting as a tap X3. After reserving the tap length, the remaining single wire starts from one end of the winding device (see Figure 4 , starting from the lower end of the winding device), adopt the winding direction opposite to that of the first 10 layers, and wind in the winding groove of the winding device in sequence; use several winding turns as tapping points to lead out tap X5, continue to wind the original wire, then use several winding turns as tapping points to lead out another tap X7, and lead out several taps in total until reaching the other end of the winding device. Finally, lead out a tap X, and this tap is the coil end.

[0052] Embodiment 2

[0053] This embodiment proposes a multi-tapped layer-type single coil. The layer-type single coil is wound by using the multi-tapped layer-type single coil winding method. The number of layers of the layer-type single coil is n. The first layer starts from any end of a single wire as the winding starting point, starts from one end of the winding device, and winds in the winding groove of the winding device in sequence until reaching the other end of the winding device;

[0054] When winding the first n - 2 layers of the layer-type single coil, after the i-th layer is wound, ascend from the i-th layer to the i + 1-th layer of the wound coil. Start from one end of the winding device, adopt the same winding direction as the i-th layer, and wind in the winding groove of the winding device in sequence until reaching the other end of the winding device to complete the winding of the i + 1-th layer of the coil, where i is greater than 1 and less than n - 2;

[0055] When winding the (n - 1)-th layer of the layer-type single coil, starting from one end of the winding device, using the same winding direction as the (n - 2)-th layer, sequentially wind in the winding groove of the winding device, and taking several winding turns as tapping points to lead out taps. The original wire continues to wind, and then taking several winding turns as tapping points to lead out another tap. A total of several taps are led out until winding reaches the other end of the winding device. Finally, one tap is led out, and the winding is completed. The end of the finally led-out tap is cut off;

[0056] When winding the n-th layer of the layer-type single coil, one end of the remaining single wire after cutting is used as a tap. After reserving the tap length, the remaining single wire starts from one end of the winding device, uses the winding direction opposite to the previous (n - 1) layers, sequentially winds in the winding groove of the winding device, and taking several winding turns as tapping points to lead out taps. The original wire continues to wind, and then taking several winding turns as tapping points to lead out another tap. A total of several taps are led out until winding reaches the other end of the winding device. Finally, one tap is led out as the coil end.

[0057] In this embodiment, according to the interlayer working voltage, interlayer insulation is provided between the i-th layer and the (i + 1)-th layer of the layer-type single coil.

[0058] See Figure 4 the shown coil schematic diagram. The voltage difference between different winding layers is not evenly distributed along the axis. Considering the interlayer working voltage, different interlayer insulations need to be provided. In the figure, "1" to "11" represent the number of layers of the layer-type coil. Starting from the A-phase end, between the first layer and the upper half end of the second layer of the coil, 14 layers of insulating paper are used for insulation isolation, and between the lower half ends, 8 layers of insulating paper are used for insulation isolation. While between the lower half ends of the second layer and the third layer, 13 layers of insulating paper are used for insulation isolation, and between the upper half ends of the second layer and the third layer, 7 layers of insulating paper are used for insulation isolation. Between the third layer and the fourth layer, an oil duct is used for insulation isolation. Between the upper ends of the fourth layer and the fifth layer, 6 layers of insulating paper are used for insulation isolation, and between the lower ends of the fourth layer and the fifth layer, 12 layers of insulating paper are used for insulation isolation. The arrangements between the remaining layers are similar, and reference can be made to Figure 4 。

[0059] In this embodiment, the number of turns distribution of different layers of the layer-type single coil is different. In this embodiment, the first 9 layers of the coil have 46 turns, the 10th layer of the coil has 45 turns, and the 11th layer of the coil has 44 turns.

[0060] In this embodiment, the 10th layer and the 11th layer of the coil are wound separately after a single wire is disconnected, that is, the 10th layer and the 11th layer are disconnected. After the 10th layer is wound, when starting to wind the 11th layer, there is no need for layer-lifting treatment between the layers of the coil. The winding method has a simple process, high production efficiency, and is safe and reliable. It avoids the problem in the existing technology that a scissor opening will be formed at the layer-lifting position of the wire, and the wire at the scissor opening position needs to be wrapped with insulation. If the process treatment is not good here, or an external sudden short circuit occurs in the transformer, the coil will bear a large mechanical stress, which is likely to cause insulation damage at the scissor opening, leading to coil short circuit, and thus causing the transformer coil to burn out and power outage.

[0061] In this embodiment, several taps led out from the (n - 1)th layer are located outside the (n - 1)th layer and are radially led out. See Figure 4 , that is, the taps X2, X4, and X6 led out from the 10th layer are all led out from the outside of the 10th layer and are radially led out. The taps are not located inside the coil. The several taps led out from the nth layer are located outside the nth layer and are also radially led out, that is, the taps X7, X5, and X3 led out from the 11th layer are all radially led out.

[0062] According to the leading-out order during the winding process, the several taps led out from the 10th layer are successively tap X6, tap X4, and tap X2, and the several taps led out from the 11th layer are successively tap X3, tap X5, and tap X7. Finally, a tap is led out as the end X of the coil. The layer-type single coil forms 5 coil tapping positions by the taps, including: tap X2 - tap X3, tap X3 - tap X4, tap X4 - tap X5, tap X5 - tap X6, tap X6 - tap X7. Among them, tap X2 is at the upper end of the layer-type coil, tap X3 is at the lower end of the layer-type coil, and tap X6 - tap X7 is the smallest tapping position of the coil. In this embodiment, see Figure 5, there is a floating voltage between the coil taps X2 and X3. Therefore, sufficient electrical distance must be left between the internal taps X2 and X3 of the coil. In this embodiment, tap X2 of the sectional single coil is at the upper end of the coil, and tap X3 is at the lower end of the coil. The insulation distance between tap X2 and tap X3 is large, and its size is equal to the height dimension of the coil. Moreover, there is no insulation distance between tap X2 and tap X3 inside the coil, and there is only insulation distance outside. This insulation distance is very large. Therefore, when the coil is operating, the wire insulation at taps X2 and X3 inside the coil will not be broken down, and it will not cause the transformer coil to burn out and power outage. At the same time, since there is no insulation distance between tap X2 and tap X3 inside the coil, the occupancy efficiency of the wire is improved, the overall size of the coil can be reduced, the length and weight of the wire can be reduced, and the resistance loss of the coil can be reduced. Moreover, since the insulation between tap X2 and tap X3 is not inside the coil but outside the coil, the height dimension of the coil can be effectively reduced. Since the coil is sleeved on the iron core, the size of the iron core is also reduced accordingly, achieving the purpose of reducing the weight of the iron core, reducing the loss and noise of the iron core.

[0063] See Figure 5 , when the coil is at the minimum tap position of tap X6 - tap X7 coil, at this time tap X6 - tap X7 are connected, and there are still 20 turns in the last layer of the coil. And the 20 - turn coil is close to the fixed end of the coil. The ampere - turns between the high - voltage and low - voltage windings are relatively balanced. When an external sudden short - circuit occurs in the transformer, the sudden mechanical force borne by the coil can be reduced, and the coil has a strong ability to bear the sudden short - circuit force.

[0064] Embodiment 3

[0065] This embodiment provides a transformer. The winding of the transformer is a sectional single coil formed by winding a single wire with multiple taps. The single wire is wound into a sectional single coil by using the sectional single - coil winding method with multiple taps.

[0066] Obviously, the above - mentioned embodiments of the present invention are only examples for clearly explaining the present invention, and are not limitations on the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention should be included within the protection scope of the claims of the present invention.

Claims

1. A winding method for a multi-tapped layer type single coil, characterized in that, It includes the following steps: S1: Let the total number of layers of the to-be-wound layer-type single coil be n, the layer sequence number of the wound single coil be i, both i and n are positive integers, n is the outermost layer of the layer-type single coil, and let i = 1; S2: Take any end of a single wire as the coil starting end, and use it as the winding starting point. Start from one end of the winding device, and wind successively in the winding groove of the winding device until reaching the other end of the winding device; S3: Ascend from the i-th layer to the (i + 1)-th layer of the wound coil. Start from one end of the winding device, adopt the same winding direction as the i-th layer, and wind successively in the winding groove of the winding device until reaching the other end of the winding device to complete the winding of the (i + 1)-th layer of the coil; S4: Judge whether i is less than n - 2. If so, increase the value of i by 1, and return to execute step S3. Otherwise, ascend from the (n - 2)-th layer to the (n - 1)-th layer of the wound coil, and execute S5; S5: Start the winding of the (n - 1)-th layer: Start from one end of the winding device, adopt the same winding direction as the (n - 2)-th layer, wind successively in the winding groove of the winding device, and use several winding turns as tapping points to lead out taps. The original wire continues to wind, and then use several winding turns as tapping points to lead out another tap, and a total of several taps are led out until reaching the other end of the winding device. Finally, lead out a tap, complete the winding, and cut off the end of the last led-out tap; S6: Take one end of the remaining single wire after cutting as a tap. After reserving the tap length, the remaining single wire starts from one end of the winding device and winds successively in the winding groove of the winding device in the winding direction opposite to the previous (n - 1) layers; S7: Use several winding turns as tapping points to lead out taps. The original wire continues to wind, and then use several winding turns as tapping points to lead out another tap, and a total of several taps are led out until reaching the other end of the winding device. Finally, lead out a tap as the coil end; 2. The multi-tapped layer type single coil winding method according to claim 1, wherein In step S2, any end of the single wire used as the winding starting point is any one of the coil starting ends A, B, or C. In S7, the last led-out tap is any one of the coil ends X, Y, or Z. Among them, if the coil starting end is A, the coil end is X; if the coil starting end is B, the coil end is Y; if the coil starting end is C, the coil end is Z.

3. The multi-tap layer type single coil winding method according to claim 1, wherein The wire starts from one end of the winding device and winds successively in the winding groove of the winding device until reaching the other end of the winding device to form a layer of the wound coil.

4. The multi-tapped layer type single coil winding method according to claim 1, characterized in that, The so-called layer ascending means that after the winding of the i-th layer is completed and before the winding of the (i + 1)-th layer starts, the wire at the end of the winding of the i-th layer directly makes a sequential transition to the (i + 1)-th layer at the end of the winding device where it is currently located without performing end transposition of the winding device, and i is less than n - 2.

5. A multi-tapped laminated single coil, characterized in that, The layer-type single coil is wound by using the layer-type single coil winding method with multiple taps described in any one of claims 1 to 4. The number of layers of the layer-type single coil is n. The first layer starts from any end of a single wire as the winding starting point, starts from one end of the winding device, and winds successively in the winding groove of the winding device until reaching the other end of the winding device; When winding the first n - 2 layers of the layer - type single - coil, after the winding of the i - th layer is completed, the layer is raised from the i - th layer of the winding coil to the (i + 1) - th layer. Starting from one end of the winding device, using the same winding direction as the i - th layer, it is successively wound in the winding groove of the winding device until the other end of the winding device is reached, and the winding of the (i + 1) - th layer of the coil is completed, where i is greater than 1 and less than n - 2; When winding the (n - 1) - th layer of the layer - type single - coil, starting from one end of the winding device, using the same winding direction as the (n - 2) - th layer, it is successively wound in the winding groove of the winding device. Taking several winding turns as tapping points, taps are led out, the original wire continues to be wound, and then taking several winding turns as tapping points, another tap is led out. A total of several taps are led out until the other end of the winding device is reached. Finally, a tap is led out, and the winding is completed. The end of the finally led - out tap is cut off; When winding the n - th layer of the layer - type single - coil, one end of the remaining single - wire after cutting is used as a tap. After reserving the tap length, the remaining single - wire starts from one end of the winding device, using the winding direction opposite to the first n - 1 layers, and is successively wound in the winding groove of the winding device. Taking several winding turns as tapping points, taps are led out, the original wire continues to be wound, and then taking several winding turns as tapping points, another tap is led out. A total of several taps are led out until the other end of the winding device is reached. Finally, a tap is led out as the end of the coil.

6. The multi-tapped layer type single coil according to claim 5, characterized in that, According to the inter - layer working voltage, inter - layer insulation is provided between the i - th layer and the (i + 1) - th layer of the layer - type single - coil.

7. The multi-tapped layer type single coil according to claim 6, characterized in that, The several taps led out from the (n - 1) - th layer are located outside the (n - 1) - th layer and are radially led out.

8. The multi-tapped layer type single coil according to claim 7, characterized in that, The several taps led out from the n - th layer are located outside the n - th layer and are radially led out.

9. The multi-tapped laminated single coil according to claim 8, characterized in that, According to the leading - out sequence during the winding process, the several taps led out from the (n - 1) - th layer are successively tap X6, tap X4, and tap X2, and the several taps led out from the n - th layer are successively tap X3, tap X5, and tap X7. Finally, a tap is led out as the coil end X. The layer - type single - coil forms 5 coil tapping positions by taps, including: tap X2 - tap X3, tap X3 - tap X4, tap X4 - tap X5, tap X5 - tap X6, tap X6 - tap X7. Among them, tap X2 is at the upper end of the layer - type single - coil, tap X3 is at the lower end of the layer - type single - coil, and tap X6 - tap X7 is the smallest coil tapping position.

10. A transformer, characterized in that, The winding of the transformer is a layer - type single - coil formed by winding a single wire with multiple taps. The single wire is wound into a layer - type single - coil by using the layer - type single - coil winding method with multiple taps described in any one of claims 1 to 4.

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