Low-voltage double-split winding structure and split type transformer

Abstract

The low-voltage double-split winding structure comprises a low-voltage winding, a medium-voltage winding and a high-voltage winding, the low-voltage winding, the medium-voltage winding and the high-voltage winding are sequentially arranged at intervals in the radial direction, and the low-voltage winding is formed by winding a first low-voltage sub-winding and a second low-voltage sub-winding which are the same in voltage class at the same time. A wire of the first low-voltage sub-winding and a wire of the second low-voltage sub-winding are arranged in a cross transposition mode at a first preset position, the first low-voltage sub-winding and the second low-voltage sub-winding are separated through an insulating part, and the first low-voltage sub-winding can supply power to the high-voltage winding and / or the medium-voltage winding; and / or the second low-voltage sub-winding can supply power to the high-voltage winding and / or the medium-voltage winding. The transformer adopting the low-voltage double-split winding structure can supply power to two power utilization sides of different grades at the same time, and compared with a traditional double-split transformer, the number of transformers needed for supplying power to the two power utilization sides of different voltage grades is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of double-split transformers, in particular to a low-voltage double-split winding structure and a split transformer. Background Art

[0002] With the introduction of the dual carbon policy, the new energy industry has flourished, especially photovoltaic and wind power projects have grown rapidly. The new power generation model has put forward higher requirements for transformers to cope with complex and changeable power systems. For traditional low-voltage axially split low-voltage double-split transformers, there are only two voltages, high voltage and low voltage. This means that its power transmission method can only be from high voltage to low voltage or low voltage to high voltage. When facing two power consumption sides with different voltage levels, two traditional double-split transformers are required to meet the power supply needs.

[0003] In view of this, it is necessary to provide a new low-voltage double-split winding structure and a split transformer to solve or at least alleviate the above-mentioned technical defects. Utility Model Content

[0004] The main purpose of the utility model is to provide a low-voltage double-split winding structure and a split transformer, aiming to solve the technical problems of the existing low-voltage double-split transformer in terms of power transmission mode and relatively single function.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a low-voltage double-split winding structure, the low-voltage double-split winding structure comprises a low-voltage winding, a medium-voltage winding and a high-voltage winding which are arranged in sequence along the radial direction, the voltage levels of the high-voltage winding, the medium-voltage winding and the low-voltage winding are different, the low-voltage winding is formed by simultaneously winding a first low-voltage sub-winding and a second low-voltage sub-winding with the same voltage level, the conductor of the first low-voltage sub-winding and the conductor of the second low-voltage sub-winding are cross-transposed at a first preset position, and the first low-voltage sub-winding and the second low-voltage sub-winding are separated by an insulating member, and the first low-voltage sub-winding can supply power to the high-voltage winding and / or the medium-voltage winding; and / or,

[0006] The second low voltage sub-winding can supply power to the high voltage winding and / or the medium voltage winding.

[0007] In one embodiment, the first low-voltage sub-winding and the second low-voltage sub-winding are wound simultaneously to form the low-voltage winding, the height of the first low-voltage sub-winding is equal to the height of the second low-voltage sub-winding, the first preset position is half the height of the first low-voltage sub-winding, and half the height of the first low-voltage sub-winding and half the height of the second low-voltage sub-winding are at the same height position.

[0008] In one embodiment, the first low-voltage sub-winding and the second low-voltage sub-winding are double-split windings with the same voltage level and rated capacity.

[0009] In one embodiment, the first low-voltage sub-winding includes a first conductor and a second conductor, the first conductor and the second conductor are wound in parallel to form the first low-voltage sub-winding, and the first conductor and the second conductor are cross-transposed at a second preset position and a third preset position; the second low-voltage sub-winding includes a third conductor and a fourth conductor, the third conductor and the fourth conductor are wound in parallel to form the second low-voltage sub-winding, and the third conductor and the fourth conductor are cross-transposed at the second preset position and the third preset position.

[0010] In one embodiment, the second preset position is at one quarter of the height of the first low-voltage sub-winding, and the third preset position is at three quarters of the height of the first low-voltage sub-winding; one quarter of the height of the first low-voltage sub-winding and one quarter of the height of the second low-voltage sub-winding are at the same height position; three quarters of the height of the first low-voltage sub-winding and three quarters of the height of the second low-voltage sub-winding are at the same height position.

[0011] In one embodiment, the turns and oil channels of the first low-voltage sub-winding are symmetrically arranged in the middle position of the first low-voltage sub-winding; and / or the turns and oil channels of the second low-voltage sub-winding are symmetrically arranged in the middle position of the second low-voltage sub-winding.

[0012] In one embodiment, the low voltage double split winding structure may further include a voltage regulating winding, which is arranged in sequence with the high voltage winding along the radial direction, and the voltage regulating winding is arranged on a side of the high voltage winding away from the medium voltage winding.

[0013] In one embodiment, the high-voltage winding is star-connected, the medium-voltage winding is star-connected, the first low-voltage sub-winding is star-connected, the second low-voltage sub-winding is star-connected, and the low-voltage double-split winding structure also includes a stabilizing winding, which is arranged in sequence with the low-voltage winding in a radial direction, and the stabilizing winding is arranged on the side of the low-voltage winding away from the medium-voltage winding.

[0014] In addition, the utility model also provides a split transformer, which includes an iron core and the above-mentioned low-voltage double-split winding structure, and the iron core, the low-voltage winding, the medium-voltage winding and the high-voltage winding are arranged in sequence and spaced apart in the radial direction.

[0015] In the above technical scheme of the utility model, the low-voltage double-split winding structure includes a low-voltage winding, a medium-voltage winding and a high-voltage winding with different voltage levels, wherein the low-voltage winding is formed by simultaneously winding a first low-voltage sub-winding and a second low-voltage sub-winding, and the conductors of the first low-voltage sub-winding and the conductors of the second low-voltage sub-winding are cross-transposed at a first preset position, so that the first sub-winding can not only supply power to the high-voltage winding, but also to the medium-voltage winding, and can also supply power to the high-voltage winding and the medium-voltage winding at the same time, that is, a transformer with a low-voltage double-split winding structure can meet the power demand of two power consumption sides with different voltage levels, enriching the power transmission mode and function of the transformer, and reducing the number of transformers required to supply power to two power consumption sides with different voltage levels. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the implementation mode of the utility model or the technical solution in the prior art, the drawings required for use in the implementation mode or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some implementation modes of the utility model. For ordinary technicians in this field, other drawings can be obtained by using the structures shown in these drawings without paying any creative work.

[0017] Figure 1 This is a partial structural diagram of a split-type transformer according to an embodiment of the utility model;

[0018] Figure 2 This is a schematic diagram of a structure in which a voltage regulating winding is provided in a low voltage double split winding structure according to an embodiment of the utility model;

[0019] Figure 3 This is a schematic diagram of a structure in which a low-voltage double-split winding structure is provided with a stabilizing winding according to an embodiment of the utility model;

[0020] Figure 4 It is a cross-sectional schematic diagram of a partial structure of a low-voltage winding according to an embodiment of the utility model;

[0021] Figure 5 This is a structural schematic diagram of the first low-voltage sub-winding and the medium-voltage winding in semi-through operation in an embodiment of the utility model;

[0022] Figure 6 This is a structural schematic diagram of the second low-voltage sub-winding and the medium-voltage winding in semi-through operation in one embodiment of the utility model;

[0023] Figure 7 The figure is a schematic structural diagram of a low-voltage winding conductor according to an embodiment of the utility model.

[0024] Description of Figure Numbers:

[0025]

[0026]

[0027] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with the implementation methods and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] It should be noted that all directional indications (such as up, down, left, and right) in the embodiments of the present invention are only used to explain the position of the user in a certain posture (such as the attached Figure 1 The relative position relationship, movement status, etc. between the various components under the specific posture are shown. If the specific posture changes, the directional indication will also change accordingly.

[0030] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" can explicitly or implicitly include at least one of the features.

[0031] Furthermore, the technical solutions between the various implementation modes of the present invention can be combined with each other, but this must be based on the fact that ordinary technicians in the field can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0032] The utility model provides a low voltage double split winding structure 1, such as Figure 1 to Figure 4As shown, in one embodiment, the low-voltage double-split winding structure 1 includes a low-voltage winding 11, a medium-voltage winding 12 and a high-voltage winding 13 which are arranged in radial order at intervals, and the voltage levels of the high-voltage winding 13, the medium-voltage winding 12 and the low-voltage winding 11 are different. The low-voltage winding 11 includes a first low-voltage sub-winding 111 and a second low-voltage sub-winding 112 with the same voltage level. The conductors of the first low-voltage sub-winding 111 and the conductors of the second low-voltage sub-winding 112 are cross-transposed at a first preset position, and the first low-voltage sub-winding 111 and the second low-voltage sub-winding 112 are separated by an insulating member 5, and the first low-voltage sub-winding 111 can supply power to the high-voltage winding 13 and / or the medium-voltage winding 12; and / or, the second low-voltage sub-winding 112 can supply power to the high-voltage winding 13 and / or the medium-voltage winding 12.

[0033] The low-voltage double-split winding structure 1 includes a low-voltage winding 11, a medium-voltage winding 12 and a high-voltage winding 13 with different voltage levels, wherein the low-voltage winding 11 is formed by simultaneously winding a first low-voltage sub-winding 111 and a second low-voltage sub-winding 112, and the conductor of the first low-voltage sub-winding 111 and the conductor of the second low-voltage sub-winding 112 are cross-transposed at a first preset position, so that the first low-voltage sub-winding 111 can not only supply power to the high-voltage winding 13, but also to the medium-voltage winding 12, and can also simultaneously supply power to the high-voltage winding 13 and the medium-voltage winding 12. power; and the second low-voltage sub-winding 112 can also supply power to the high-voltage winding 13, and can also supply power to the medium-voltage winding 12, and can also supply power to the medium-voltage winding 12 and the high-voltage winding 13 at the same time; further, the first low-voltage sub-winding 111 and the second low-voltage sub-winding 112 can supply power to the high-voltage winding 13 together, and can also supply power to the medium-voltage winding 12 together, and can also supply power to the high-voltage winding 13 and the medium-voltage winding 12 at the same time, and vice versa, that is, the high-voltage winding 13 can supply power to the first low-voltage sub-winding 111, and the medium-voltage winding 12 can supply power to the first low-voltage sub-winding 111 The high-voltage winding 13 and the medium-voltage winding 12 can simultaneously supply power to the first low-voltage sub-winding 111, the high-voltage winding 13 can supply power to the second low-voltage sub-winding 112, the medium-voltage winding 12 can supply power to the second low-voltage sub-winding 112, the high-voltage winding 13 and the medium-voltage winding 12 can simultaneously supply power to the second low-voltage sub-winding 112, the high-voltage winding 13 can simultaneously supply power to the first low-voltage sub-winding 111 and the second low-voltage sub-winding 112, the medium-voltage winding 12 can simultaneously supply power to the first low-voltage sub-winding 111 and the second low-voltage sub-winding 112, the high-voltage winding 13 The medium voltage winding 12 can simultaneously supply power to the first low voltage sub-winding 111 and the second low voltage sub-winding 112; thereby meeting the multi-purpose operation requirements of the double-split transformer, and the low voltage double-split winding structure 1 has high operation efficiency, safety and reliability; the transformer adopting the low voltage double-split winding structure 1 can simultaneously supply power to two power consumption sides of different levels. Compared with the traditional axial double-split transformer, the number of transformers required to supply power to two power consumption sides of different voltage levels is reduced, thereby reducing the land used to build the transformer, thereby saving construction funds.

[0034] It should be noted that the first low-voltage sub-winding 111 and the second low-voltage sub-winding 112 are wound at the same time, and the wires of the first low-voltage sub-winding 111 and the wires of the second low-voltage sub-winding 112 are cross-transposed at the first preset position, so that the transformer adopting the low-voltage double-split winding structure 1 can not only realize the power transmission when the high-voltage winding 13 and the medium-voltage winding 12 of the conventional power transformer are in operation; it can also meet the full-through and half-through operation of the high-voltage winding 13 and the low-voltage winding 11; the full-through and half-through operation of the medium-voltage winding 12 and the low-voltage winding 11; and it can also meet the various functions of the joint operation of the low-voltage winding 11, the medium-voltage winding 12, and the high-voltage winding 13. It should also be noted that the insulating member 5 can be an insulating pad paper or a molded stay.

[0035] Furthermore, in one embodiment, the first low-voltage sub-winding 111 and the second low-voltage sub-winding 112 are wound simultaneously to form the low-voltage winding 11, the height of the first low-voltage sub-winding 111 is equal to the height of the second low-voltage sub-winding 112, the first preset position is half of the height of the first low-voltage sub-winding 111, and half of the height of the first low-voltage sub-winding 111 and half of the height of the second low-voltage sub-winding 112 are at the same height. The heights of the first low-voltage sub-winding 111 and the second low-voltage sub-winding 112 in the axial direction are also consistent, which makes the half of the first low-voltage sub-winding 111 and the half of the second low-voltage sub-winding 112 at the same height, wherein the half of the height of the first low-voltage sub-winding 111 is Figure 1 The reason why the position of L1 is selected at half of the height for cross-transposition is to make the short-circuit impedance of the first low-voltage sub-winding 111 and the second low-voltage sub-winding 112 the same as that of the high-voltage winding 13, and at the same time make the short-circuit impedance of the first low-voltage sub-winding 111 and the second low-voltage sub-winding 112 the same as that of the medium-voltage winding 12. Figure 5 and Figure 6As shown, and taking the half-through operation of the medium-voltage winding 12 to the low-voltage winding 11 as an example, since the first low-voltage sub-winding 111 and the second low-voltage sub-winding 112 are cross-interchange in the middle position, and the turns and oil channels of the medium-voltage winding 12 are arranged symmetrically in the middle position, the short-circuit impedance of the medium-voltage winding 12 and the first low-voltage sub-winding 111 is the same as that of the medium-voltage winding 12 and the second low-voltage sub-winding 112, which meets the actual operation requirements; similarly, the short-circuit impedance of the high-voltage winding 13 and the first low-voltage sub-winding 111 is the same as that of the high-voltage winding 13 and the second low-voltage sub-winding 112, which also meets the actual operation requirements. It should be noted that the transformer adopting the low-voltage double-split winding structure 1, when the high-voltage winding 13 and the low-voltage winding 11 or the medium-voltage winding 12 and the low-voltage winding 11 are fully through operation, its short-circuit impedance and loss performance are similar to those of the traditional axial double-split transformer. It should also be noted that the first low-voltage sub-winding 111 and the second low-voltage sub-winding 112 may be a single-helix structure or a multi-helix structure.

[0036] Furthermore, in one embodiment, the first low-voltage sub-winding 111 and the second low-voltage sub-winding 112 are double-split winding conductors with the same voltage level and rated capacity.

[0037] Furthermore, in one embodiment, the first low-voltage sub-winding 111 includes a first wire 1111 and a second wire 1112, which are wound in parallel to form the first low-voltage sub-winding 111, and the first wire 1111 and the second wire 1112 are cross-transposed at the second preset position and the third preset position; the second low-voltage sub-winding 112 includes a third wire 1121 and a fourth wire 1122, which are wound in parallel to form the second low-voltage sub-winding 112, and the third wire 1121 and the fourth wire 1122 are cross-transposed at the second preset position and the third preset position. The first wire 1111, the second wire 1112, the third wire 1121 and the fourth wire 1122 are all of equal length, and the first low-voltage sub-winding 111 and the second low-voltage sub-winding 112 are symmetrically arranged with the central axis as the reference, and the central axis extends in the axial direction and passes through the first preset position, so that the internal circulation loss of the wire can be effectively controlled and reduced. Figure 1 The left and right directions shown are as follows: Figure 1 Up and down directions shown.

[0038] Furthermore, in one embodiment, the second preset position is at one quarter of the height of the first low-voltage sub-winding 111, and the third preset position is at three quarters of the height of the first low-voltage sub-winding 111; one quarter of the height of the first low-voltage sub-winding 111 and one quarter of the height of the second low-voltage sub-winding 112 are at the same height; three quarters of the height of the first low-voltage sub-winding 111 and three quarters of the height of the second low-voltage sub-winding 112 are at the same height. This setting can effectively control and reduce the circulating current loss inside the wire, thereby reducing the load loss of the transformer and improving the operating efficiency. In addition, the transformer adopting the low-voltage double-split winding structure 1 has a much lower leakage flux density during semi-through operation than the traditional axial double-split transformer during semi-through operation, reducing the increased losses caused by leakage flux and the increased risk of local overheating. At the same time, it avoids the problem of ampere-turn imbalance between the high-voltage winding 13 and the low-voltage winding 11 or the medium-voltage winding 12 and the low-voltage winding 11 during semi-through operation of the traditional axial double-split transformer, thereby greatly reducing the axial short-circuit stress and improving the reliability of the transformer operation. It should be noted that the position at one-quarter of the height of the first low-voltage sub-winding 111 is Figure 7 At the position where L2 is located, the position at three quarters of the height of the first low voltage sub-winding 111 is Figure 7 The location of L3 is shown.

[0039] According to an embodiment of the utility model, a winding inner support bar 3 is provided on one side of the low voltage winding 11 , and a cardboard tube 4 is provided on the side of the winding inner support bar 3 away from the low voltage winding 11 .

[0040] Furthermore, in one embodiment, the turns and oil passages of the first low-voltage sub-winding 111 are symmetrically arranged in the middle position of the first low-voltage sub-winding 111; the turns and oil passages of the second low-voltage sub-winding 112 are symmetrically arranged in the middle position of the second low-voltage sub-winding 112. Thus, the symmetry of the axial ampere-turns of the low-voltage winding 11 is effectively guaranteed. It should be noted that the high-voltage winding 13 can adopt the end-input method or the middle-input structure, and the turns and oil passages of the high-voltage winding 13 and the medium-voltage winding 12 are arranged symmetrically in the middle of the winding to ensure the symmetry of the axial ampere-turns. It should be noted that the oil gap pad 2 of the first low-voltage sub-winding 111 is also symmetrically arranged in the middle position of the first low-voltage sub-winding 111. Similarly, the oil gap pad 2 of the second low-voltage sub-winding 112 is also symmetrically arranged in the middle position of the second low-voltage sub-winding 112.

[0041] In addition, in one embodiment, the low voltage double split winding structure 1 further includes a voltage regulating winding 14, which is arranged in sequence with the high voltage winding 13 in the radial direction, and the voltage regulating winding 14 is arranged on the side of the high voltage winding 13 away from the medium voltage winding 12. The voltage regulating winding 14 may include a high voltage regulating winding 14 or a medium voltage regulating winding 14. When the high voltage winding 13 has a voltage regulating tap, the arrangement of each winding in the radial direction is: low voltage winding 11, medium voltage winding 12, high voltage winding 13 and high voltage regulating winding 14; when the medium voltage winding 12 has a voltage regulating tap, the arrangement of each winding in the radial direction is: low voltage winding 11, medium voltage winding 12, high voltage winding 13 and medium voltage regulating winding 14; when the high voltage winding 13 and the medium voltage winding 12 have a voltage regulating tap, the arrangement of each winding in the radial direction is: low voltage winding 11, medium voltage winding 12, high voltage winding 13 and medium voltage regulating winding 14; When the winding 12 has a voltage regulating tap, the windings are arranged in the radial direction as follows: low voltage winding 11, medium voltage winding 12, high voltage winding 13, high voltage regulating winding 14 and medium voltage regulating winding 14; or the high voltage regulating winding 14 and the medium voltage regulating winding 14 are arranged axially, and the windings are arranged in the radial direction as follows: low voltage winding 11, medium voltage winding 12, high voltage winding 13 and regulating winding 14 (including high voltage regulating winding 14 and medium voltage regulating winding 14).

[0042] In one embodiment, the high voltage winding 13 is star-connected, the medium voltage winding 12 is star-connected, the first low voltage sub-winding 111 is star-connected, the second low voltage sub-winding 112 is star-connected, and the low voltage double split winding structure 1 further includes a stabilizing winding 15, which is arranged in sequence with the low voltage winding 11 in a radial direction, and the stabilizing winding 15 is arranged on the side of the low voltage winding 11 away from the medium voltage winding 12. The stabilizing winding 15 is added to reduce the zero sequence impedance.

[0043] In addition, the utility model also provides a split transformer 6, which includes an iron core 7 and the above-mentioned low-voltage double split winding structure 1, and the iron core 7, the low-voltage winding 11, the medium-voltage winding 12 and the high-voltage winding 13 are arranged in sequence along the radial direction. The split transformer 6 is suitable for photovoltaic, wind power generation and other new energy power generation projects, meets multi-purpose operation requirements, has high operation efficiency, and is safe and reliable. Since the split transformer 6 adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.

[0044] The above are only preferred implementations of the utility model, and do not limit the patent scope of the utility model. All equivalent structural changes made based on the concept of the utility model and the contents of the description and drawings of the utility model, or direct / indirect application in other related technical fields are included in the patent protection scope of the utility model.

Claims

1. A low voltage double split winding structure, characterized in that: It comprises a low voltage winding, a medium voltage winding and a high voltage winding which are arranged in radial order at intervals, the voltage levels of the high voltage winding, the medium voltage winding and the low voltage winding are different, the low voltage winding is formed by simultaneously winding a first low voltage sub-winding and a second low voltage sub-winding of the same voltage level, the conductor of the first low voltage sub-winding and the conductor of the second low voltage sub-winding are cross-transposed at a first preset position, and the first low voltage sub-winding and the second low voltage sub-winding are separated by an insulating member, and the first low voltage sub-winding can supply power to the high voltage winding and / or the medium voltage winding; and / or, The second low voltage sub-winding can supply power to the high voltage winding and / or the medium voltage winding.

2. The low voltage double split winding structure according to claim 1, characterized in that: The height of the first low-voltage sub-winding is equal to the height of the second low-voltage sub-winding, the first preset position is half the height of the first low-voltage sub-winding, and half the height of the first low-voltage sub-winding and half the height of the second low-voltage sub-winding are at the same height position.

3. The low voltage double split winding structure according to claim 2, characterized in that: The first low-voltage sub-winding and the second low-voltage sub-winding are double-split windings with the same voltage level and rated capacity.

4. The low voltage double split winding structure according to claim 3, characterized in that: The first low-voltage sub-winding includes a first conductor and a second conductor, the first conductor and the second conductor are wound in parallel to form the first low-voltage sub-winding, and the first conductor and the second conductor are cross-transposed at a second preset position and a third preset position; the second low-voltage sub-winding includes a third conductor and a fourth conductor, the third conductor and the fourth conductor are wound in parallel to form the second low-voltage sub-winding, and the third conductor and the fourth conductor are cross-transposed at the second preset position and the third preset position.

5. The low voltage double split winding structure according to claim 4, characterized in that: The second preset position is at one quarter of the height of the first low-voltage sub-winding, and the third preset position is at three quarters of the height of the first low-voltage sub-winding; one quarter of the height of the first low-voltage sub-winding and one quarter of the height of the second low-voltage sub-winding are at the same height; three quarters of the height of the first low-voltage sub-winding and three quarters of the height of the second low-voltage sub-winding are at the same height.

6. The low voltage double split winding structure according to any one of claims 1 to 5, characterized in that: The turns and oil channels of the first low-voltage sub-winding are symmetrically arranged in the middle position of the first low-voltage sub-winding; the turns and oil channels of the second low-voltage sub-winding are symmetrically arranged in the middle position of the second low-voltage sub-winding.

7. The low voltage double split winding structure according to any one of claims 1 to 5, characterized in that: The low voltage double split winding structure further includes a voltage regulating winding, which is arranged in sequence with the high voltage winding along the radial direction, and the voltage regulating winding is arranged on a side of the high voltage winding away from the medium voltage winding.

8. The low voltage double split winding structure according to any one of claims 1 to 5, characterized in that: The high-voltage winding is star-connected, the medium-voltage winding is star-connected, the first low-voltage sub-winding is star-connected, the second low-voltage sub-winding is star-connected, and the low-voltage double-split winding structure also includes a stabilizing winding, which is arranged in sequence with the low-voltage winding in a radial direction, and the stabilizing winding is arranged on the side of the low-voltage winding away from the medium-voltage winding.

9. A split transformer, characterized in that: The split transformer comprises an iron core and a low-voltage double-split winding structure as claimed in any one of claims 1 to 8, wherein the iron core, the low-voltage winding, the medium-voltage winding and the high-voltage winding are sequentially spaced apart in a radial direction.

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