Winding structure and transformer

Abstract

The utility model discloses a winding structure and a transformer. The winding structure comprises a working coil group, a first shielding coil group and a second shielding coil group, the working coil group comprises at least two coil units, each coil unit comprises at least one pie-shaped coil, and each pie-shaped coil comprises a plurality of turns of coils; the second shielding coil group is arranged between turns of the pie-shaped coils, the second shielding coil group in the same coil unit is formed by winding the same shielding wire, and the first shielding coil group is arranged between the adjacent pie-shaped coils of the adjacent coil units. According to the winding structure, the potential distribution between the adjacent coil units can be improved, so that the voltage distribution between the adjacent coil units is more uniform, the voltage distribution uniformity of the winding structure can be further improved, the phenomenon that the local temperature of the winding structure sharply rises is improved, the probability of turn-to-turn short circuit and insulation damage of the winding structure is reduced, and the service life of the winding structure is prolonged. And the stability and the safety of the winding structure are improved.

Description

TECHNICAL FIELD

[0001] The embodiment of the utility model relates to the technical field of transformer, especially relates to a winding structure and transformer. BACKGROUND

[0002] The power transformer is the core electric energy transmission equipment of the power transformation system, and the transformer coil is the most important and basic component as the electrical element of the input and output electric energy of the transformer. The local line cake of the transformer coil will generate excessively high turn-to-turn overvoltage under the action of lightning impulse voltage, the longitudinal capacitance of the winding can be increased by adopting the shielding coil structure to realize the uniform distribution of the impulse voltage, so as to reduce the potential gradient and the composite field intensity in the winding, and further reduce the axial height of the winding. The transformer coil can be distributed in multiple cake-shaped coils, and different cake-shaped coils can be divided into different coil units. In the prior art, when there is an impulse voltage, excessively high turn-to-turn voltage will appear between different coil units, which will cause the local temperature to rise sharply, which may cause turn-to-turn short circuit, insulation damage, and affect the stability and safety of the equipment. CONTENT

[0003] The utility model provides a kind of winding structure and transformer, when having impulse voltage, the turn-to-turn voltage between coil unit can be reduced, the stability and safety of transformer are improved.

[0004] In the first aspect, the utility model embodiment provides a kind of winding structure, including working coil group, first shielding coil group and second shielding coil group;

[0005] The working coil group includes at least two coil units, each coil unit includes at least one cake-shaped coil, and each cake-shaped coil includes multiple turns of coil;The second shielding coil group is arranged between turns of the cake-shaped coil, and the second shielding coil group in the same coil unit is formed by winding the same shielding wire, and the first shielding coil group is arranged between adjacent cake-shaped coils of adjacent coil units.

[0006] Optionally, in the direction of the edge from the cake-shaped center of the cake-shaped coil, the second shielding coil group is between the nth turn and the nth+1 turn of the cake-shaped coil, the first shielding coil group is between the mth turn and the mth+1 turn of the cake-shaped coil, n and m are not equal;Wherein, n and m are integers greater than or equal to 1.

[0007] Optionally, the second shielding coil group is arranged on the side of the first shielding coil group away from the cake-shaped center of the cake-shaped coil.

[0008] Optionally, the first shielding coil group comprises a first coil, a connecting wire and a second coil, the first coil is arranged between one of the adjacent pie-shaped coils, the second coil is arranged between another of the adjacent pie-shaped coils, and the connecting wire extends along the vertical direction of the plane on which the coil unit is located and connects the first coil and the second coil.

[0009] Optionally, each turn of the coil comprises at least two parallel wires, and the first shielding coil group is arranged between turns of the pie-shaped coil and / or between the at least two wires of the coil in the same pie-shaped coil.

[0010] Optionally, the winding structure further comprises a third shielding coil, and the third shielding coil is arranged between the at least two parallel wires.

[0011] Optionally, the second shielding coil group comprises at least one third coil, and the third coil is arranged in at least one pie-shaped coil.

[0012] Optionally, the third coil comprises at least one turn, and each turn of the third coil is arranged between adjacent coils.

[0013] In a second aspect, the utility model embodiment further provides a transformer, comprising a core and the winding structure of the first aspect; the winding structure is arranged around the core.

[0014] The technical scheme of the utility model embodiment improves the potential distribution of the pie-shaped coil by arranging the second shielding coil group between turns of the pie-shaped coil, so that the voltage distribution of the pie-shaped coil is more uniform, and the anti-impact voltage level of the winding structure is improved. Meanwhile, the first shielding coil group is arranged between the adjacent pie-shaped coils of the adjacent coil units, which can improve the potential distribution between the adjacent coil units, so that the voltage distribution between the adjacent coil units is more uniform, the voltage distribution uniformity of the winding structure can be further improved, the phenomenon of local temperature rapid rise of the winding structure is improved, the probability of turn-to-turn short circuit and insulation damage of the winding structure is reduced, the anti-impact voltage level of the winding structure is improved, and the stability and safety of the winding structure are improved. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 A structure diagram of the winding structure provided by the utility model embodiment is shown;

[0016] Figure 2 Another structure diagram of the winding structure provided by the utility model embodiment is shown;

[0017] Figure 3 Another winding structure structure schematic view provided by the embodiment of the utility model;

[0018] Figure 4 Another winding structure structure schematic view provided by the embodiment of the utility model;

[0019] Figure 5 Another winding structure structure schematic view provided by the embodiment of the utility model;

[0020] Figure 6 The structure schematic view of a transformer provided by the embodiment of the utility model. Specific implementation

[0021] The utility model will be further explained in detail in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the utility model and are not limited to the utility model. In addition, it should be noted that, in order to facilitate the description, only the part related to the utility model is shown in the drawings, not all structures.

[0022] Figure 1 The structure schematic view of a winding structure provided by the embodiment of the utility model. As shown in the figure, Figure 1 The winding structure includes working coil group, first shielding coil group a and second shielding coil group b;The working coil group includes at least two coil units 10, each coil unit 10 includes at least one pie-shaped coil 10A, each pie-shaped coil 10A includes multiple turns of coil 101;Second shielding coil group b is arranged between the turns of pie-shaped coil 10A, the second shielding coil group b in the same coil unit 10 is formed by winding the same shielding wire, and the first shielding coil group a is arranged between the adjacent pie-shaped coils 10A of adjacent coil units 10.

[0023] Specifically, the working coil group can also be called working wire. Figure 1 The working coil group includes two coil units 10, which can also be called working units, as shown in the figure. Each coil unit 10 includes a pie-shaped coil 10A, and each pie-shaped coil 10A includes 4 turns of coil 101 arranged in a pie shape. When the coil unit 10 is wound on the iron core, the pie-shaped center is located on the iron core shaft. The direction X from the outer side of the pie to the pie center, and the 4 turns of coil 101 are numbered as the 1st turn of coil 101, the 2nd turn of coil 101, the 3rd turn of coil 101 and the 4th turn of coil 101. At this time, the 4th turn of coil 101 is arranged adjacent to the iron core. The second shielding coil group b in the same coil unit 10 is formed by winding the same shielding wire, which can make the second shielding coil group b in different coil units 10 can be different coil structure, that is, the second shielding coil group b in different coil units 10 is formed by winding the shielding wire independently.Figure 1 Two coil units 10 are shown in the example, each corresponding to a second shielding coil group b. The second shielding coil group b in one coil unit 10 is arranged between the first turn coil 101 and the second turn coil 101. The second shielding coil group b in the other coil unit 10 is arranged between the first turn coil 101 and the second turn coil 101, and between the second turn coil 101 and the third turn coil 101. The shielding coil can be made by reserving a shielding wire of a desired length, stripping and insulating the ends of the shielding wire, and then inserting the shielding coil into the corresponding position of the working coil group during the winding of the working coil group. The second shielding coil group b can be inserted between the turns of the disc-shaped coil 10A to increase the longitudinal capacitance of the disc-shaped coil 10A. Under the action of impact voltage such as lightning, the inter-turn voltage in the disc-shaped coil 10A can be shielded, the potential distribution of the coils 101 in the disc-shaped coil 10A is improved, the voltage distribution of different coils 101 in the disc-shaped coil 10A is more uniform, and the impact voltage level of the winding structure is improved. In the example, Figure 1 In the example, the second shielding coil group b is arranged between the first turn coil 101 and the second turn coil 101. At the same time, the first shielding coil group a is arranged between the adjacent disc-shaped coils 10A of adjacent coil units 10, which can increase the longitudinal capacitance between adjacent coil units 10, improve the potential distribution between adjacent coil units 10, make the voltage distribution between adjacent coil units 10 more uniform, further improve the voltage distribution uniformity of the winding structure, improve the phenomenon of local rapid temperature rise of the winding structure, reduce the probability of turn-to-turn short circuit and insulation damage of the winding structure, improve the impact voltage level of the winding structure, and improve the stability and safety of the winding structure.

[0024] The technical solution of the example improves the potential distribution of the coils in the disc-shaped coil, makes the voltage distribution of different coils in the disc-shaped coil more uniform, and improves the impact voltage level of the winding structure. At the same time, the first shielding coil group is arranged between the adjacent disc-shaped coils of adjacent coil units, which can improve the potential distribution between adjacent coil units, make the voltage distribution between adjacent coil units more uniform, further improve the voltage distribution uniformity of the winding structure, improve the phenomenon of local rapid temperature rise of the winding structure, reduce the probability of turn-to-turn short circuit and insulation damage of the winding structure, improve the impact voltage level of the winding structure, and improve the stability and safety of the winding structure.

[0025] Continuing to refer to Figure 1, along a direction X- from a center of the pie-shaped coil 10A to an edge of the pie-shaped coil 10A, the second shielding coil group b is between the n-th turn and the n+1-th turn of the pie-shaped coil 10A, the first shielding coil group a is between the m-th turn and the m+1-th turn of the pie-shaped coil 10A, and n and m are different; wherein n and m are integers greater than or equal to 1.

[0026] Specifically, as shown in Figure 1 , along a direction X- from a center of the pie-shaped coil 10A to an edge of the pie-shaped coil 10A, the first shielding coil group a and the second shielding coil group b are located between different turns of the pie-shaped coil 10A, which can avoid mutual influence between the first shielding coil group a and the second shielding coil group b, further improve the voltage distribution uniformity of the winding structure, and improve the impulse voltage level of the winding structure.

[0027] With reference to Figure 1 , the second shielding coil group b is arranged on a side of the first shielding coil group a away from the center of the pie-shaped coil 10A.

[0028] Specifically, the second shielding coil group b can be arranged on the outside of the pie-shaped coil 10A, which can shield the impulse voltage at the starting end of the winding structure, and is beneficial to improve the shielding effect of the winding structure. The first shielding coil group a can be arranged on the inside of the pie-shaped coil 10A, which can increase the transverse distance between the first shielding coil group a and the second shielding coil group b as much as possible, thereby reducing the mutual influence between the first shielding coil group a and the second shielding coil group b as much as possible, further improving the voltage distribution uniformity of the winding structure, and improving the impulse voltage level of the winding structure. For example, the second shielding coil group b can be arranged between the first turn coil 101 and the second turn coil 101, and the first shielding coil group a can be arranged between the two parallel conductors 1011 of the fourth turn coil 101.

[0029] With reference to Figure 1 , the first shielding coil group a includes a first coil a1, a connecting line l1, and a second coil a2, the first coil a1 is arranged between one of the adjacent pie-shaped coils 10A, and the second coil a2 is arranged between the other of the adjacent pie-shaped coils 10A; the connecting line l1 extends along the vertical direction Y of the plane on which the coil unit 10 is located, and connects the first coil a1 and the second coil a2.

[0030] Specifically, as shown in Figure 1 , the adjacent coil units 10 can be a first coil unit 11 and a second coil unit 12, respectively. Figure 1As shown in the structure diagram of another winding structure provided by the embodiment of the present application, the working coil group includes two coil units 10, which are a first coil unit 11 and a second coil unit 12. Each coil unit 10 includes two pie-shaped coils 10A. The first pie-shaped coil 10A1 adjacent to the first coil unit 11 and the second pie-shaped coil 10A2 adjacent to the second coil unit 12 are adjacent pie-shaped coils 10A in the adjacent coil units 10. At this time, the first shielding coil group a is arranged between the first pie-shaped coil 10A1 and the second pie-shaped coil 10A2,

[0031] Figure 2 As shown in the structure diagram of another winding structure provided by the embodiment of the present application, the working coil group includes two coil units 10, which are a first coil unit 11 and a second coil unit 12. Each coil unit 10 includes two pie-shaped coils 10A. The first pie-shaped coil 10A1 adjacent to the first coil unit 11 and the second pie-shaped coil 10A2 adjacent to the second coil unit 12 are adjacent pie-shaped coils 10A in the adjacent coil units 10. At this time, the first shielding coil group a is arranged between the first pie-shaped coil 10A1 and the second pie-shaped coil 10A2, Figure 2

[0032] The longitudinal capacitance between the first coil unit 11 and the second coil unit 12 can be increased, and the potential distribution between the adjacent coil units 10 can be improved, so that the voltage distribution between the adjacent coil units 10 is more uniform. As an example, the first coil a1 is wound between the turns of the first pie-shaped coil 10A1, and the second coil a2 is wound between the turns of the second pie-shaped coil 10A2, so that the first shielding coil group a can be arranged between the adjacent pie-shaped coils 10A of the first coil unit 11 and the second coil unit 12.

[0033] As shown in the structure diagram of another winding structure provided by the embodiment of the present application, the working coil group includes two coil units 10, which are a first coil unit 11 and a second coil unit 12. Each coil unit 10 includes two pie-shaped coils 10A. The first pie-shaped coil 10A1 adjacent to the first coil unit 11 and the second pie-shaped coil 10A2 adjacent to the second coil unit 12 are adjacent pie-shaped coils 10A in the adjacent coil units 10. At this time, the first shielding coil group a is arranged between the first pie-shaped coil 10A1 and the second pie-shaped coil 10A2, Figure 2

[0034] ​​Specifically, the second shielding coil group b in the same coil unit 10 is a shielding coil formed by winding the same shielding wire, that is, different third coils b1 are formed by winding the same shielding wire. When the coil unit 10 includes a plurality of pie-shaped coils 10A, the second shielding coil group b can include a plurality of third coils b1, and each coil b1 can be arranged between turns of one pie-shaped coil 10A, so that the second shielding coil group b can increase the longitudinal capacitance of each pie-shaped coil 10A. The turns voltage shielding of the coils 101 in each pie-shaped coil 10A can be performed under the action of the impulse voltage, the potential distribution of each pie-shaped coil 10A is improved, the voltage distribution of different coils 101 in each pie-shaped coil 10A is more uniform, and the impulse voltage level of the winding structure is improved. For example, Figure 2 It is shown that the coil unit 10 includes two pie-shaped coils 10A, and the second shielding coil group b includes two third coils b1, and one third coil b1 is arranged in each pie-shaped coil 10A.

[0035] Continuing to refer to Figure 2 In the same coil unit 10, the number of turns of different third coils b1 is the same, so that different pie-shaped coils 10A in the same coil unit 10 can have the same shielding effect.

[0036] Figure 3 Another winding structure provided by the embodiment of the utility model is shown in the structure diagram. As shown in Figure 3 Each turn coil 101 includes at least two parallel wires 1011, and in the same pie-shaped coil 10A, the first shielding coil group a is arranged between turns of the pie-shaped coil 10A and / or between the at least two wires 1011 of the coil 101.

[0037] Specifically, Figure 3 Each coil 101 includes two parallel wires 1011. As shown in Figure 3 The first turn coil 101 includes two wires 1011, both of which are represented by the number 1. The second turn coil 101 includes two wires 1011, both of which are represented by the number 2. The third turn coil 101 includes two wires 1011, both of which are represented by the number 3. The fourth turn coil 101 includes two wires 1011, both of which are represented by the number 4. The first shielding coil group a can be arranged between the two wires 1011 of the same turn coil 101, for increasing the longitudinal capacitance between adjacent coil units 10, improving the potential distribution between adjacent coil units 10, and making the voltage distribution between adjacent coil units 10 more uniform. For example, in Figure 3 The first shielding coil group a is arranged between the two wires 1011 of the fourth turn coil 101. Figure 4 Another winding structure provided by the embodiment of the utility model is shown in the structure diagram. As shown in Figure 4As shown, the first shielding coil group a can also be arranged between turns of different coils 101, which can also increase the longitudinal capacitance between adjacent coil units 10, improve the potential distribution between adjacent coil units 10, and make the voltage distribution between adjacent coil units 10 more uniform. For example, as shown in Figure 4 , the first shielding coil group a is arranged between the fourth turn coil 101 and the third turn coil 101.

[0038] Figure 5 Another structure diagram of the winding structure provided by the embodiment of the present application is shown in the figure. Figure 5 As shown, the winding structure further includes a third shielding coil c arranged between at least two parallel conductive wires 1011.

[0039] Specifically, the third shielding coil c is arranged between the conductive wires 1011 of the same coil 101, which can adjust the longitudinal capacitance of the coil 101, so that the third shielding coil c can be superimposed with the first shielding coil group a and the second shielding coil group b for shielding, thereby further improving the voltage distribution uniformity of the winding structure and improving the anti-impulse voltage level of the winding structure.

[0040] It should be noted that, Figure 5 each coil 101 includes two parallel conductive wires 1011. In other embodiments, each coil 101 can include a plurality of parallel conductive wires 1011, which are not limited here. At this time, the third shielding coil c can be arranged between any two adjacent parallel conductive wires 1011 of the plurality of parallel conductive wires 1011 of the same coil 101 to further increase the shielding effect of the winding structure, which is not limited here. Referring back to Figures 1 to 5 , the second shielding coil group b includes at least one turn, and each turn of the second shielding coil group b is arranged between adjacent coils 101.

[0041] Specifically, the number of turns of the second shielding coil group b can be set according to the position of the coil unit 10 in the winding structure. When the coil unit 10 is located at the head end of the winding structure, the number of turns of the second shielding coil group b can be relatively large, which can better shield the impulse voltage when the impulse voltage gradient is relatively large at the head end of the winding structure. When the coil unit 10 is located at the tail end of the winding structure, the number of turns of the second shielding coil group b can be relatively small, which can meet the shielding requirement of the impulse voltage when the impulse voltage gradient is relatively small at the tail end of the winding structure. For example, as shown in Figures 1 to 5As shown, when the first coil unit 11 is located at the first end of the winding structure, and the second coil unit 12 is located at the end of the winding structure, the second shielding coil group b in the first coil unit 11 is 2 turns, which is respectively arranged between the 1st turn coil 101 and the 2nd turn coil 101, and between the 2nd turn coil 101 and the 3rd turn coil 101, so that the impulse voltage can be better shielded. The second shielding coil group b in the second coil unit 12 is 1 turn, which is arranged between the 1st turn coil 101 and the 2nd turn coil 101, so that the shielding requirement of the impulse voltage can be met.

[0042] With reference to the foregoing Figures 1 to 5 In different coil units 10, the number of turns of the second shielding coil group b can be different. For example, Figure 5 As shown, the number of turns of the second shielding coil group b in the first coil unit 11 is 2 turns, which is respectively arranged between the 1st turn coil 101 and the 2nd turn coil 101, and between the 2nd turn coil 101 and the 3rd turn coil 101. The number of turns of the second shielding coil group b in the second coil unit 12 is 1 turn, which is arranged between the 1st turn coil 101 and the 2nd turn coil 101, so that the arrangement of the shielding coil can be flexibly adjusted according to the shielding requirement.

[0043] The embodiment of the utility model further provides a transformer. Figure 6 A structure schematic diagram of a transformer is provided for the embodiment of the utility model. As shown in Figure 6 The transformer includes the iron core 200 and the winding structure 100 provided by any embodiment of the utility model, and the winding structure 100 is arranged around the iron core 200. Since the transformer includes the winding structure 100 provided by any embodiment of the utility model, the transformer has the same beneficial effects as the winding structure 100 provided by any embodiment of the utility model, and details are not repeated here.

[0044] It should be noted that the above is only the preferred embodiment of the utility model and the technical principle applied. Those skilled in the art will understand that the utility model is not limited to the specific embodiments described herein, and those skilled in the art can make various obvious changes, re-adjustment and replacement without departing from the protection scope of the utility model. Therefore, although the utility model is described in more detail through the above embodiments, the utility model is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the utility model concept, and the scope of the utility model is determined by the appended claims.

Claims

1. A winding structure, characterized by, The working coil group comprises at least two coil units, each of which comprises at least one pancake coil, and each of the pancake coils comprises a plurality of turns; the second shielding coil group is arranged between the turns of the pancake coil, and the second shielding coil groups in the same coil unit are formed by winding the same shielding wire; and the first shielding coil group is arranged between adjacent pancake coils of adjacent coil units. In a direction from the center of the pancake coil to the edge of the pancake coil, the second shielding coil group is arranged between the nth turn and the (n+1)th turn of the pancake coil, and the first shielding coil group is arranged between the mth turn and the (m+1)th turn of the pancake coil, where n and m are different integers greater than or equal to 1.

2. The winding structure of claim 1, wherein, The second shielding coil group is arranged on a side of the first shielding coil group away from the center of the pancake coil.

3. The winding structure of claim 2, wherein, The first shielding coil group comprises a first coil, a connecting wire and a second coil, the first coil is arranged between two adjacent pancake coils, and the second coil is arranged between the other two adjacent pancake coils; the connecting wire extends in a direction perpendicular to the plane of the coil unit and connects the first coil and the second coil.

4. The winding structure of claim 1, wherein, Each turn of the coil comprises at least two parallel wires, and the first shielding coil group is arranged between the turns of the pancake coil and / or between the at least two wires of the coil in the same pancake coil.

5. The winding structure according to any of claims 1-4, characterized in that, The third shielding coil is arranged between the at least two parallel wires.

6. The winding structure of claim 5, wherein, The second shielding coil group comprises at least one third coil, and the third coil is arranged in at least one pancake coil.

7. The winding structure of claim 1, wherein, The third coil comprises at least one turn, and each turn of the third coil is arranged between adjacent coils.

8. The winding structure of claim 7, wherein, The core and the winding structure of any one of claims 1-8 are provided, and the winding structure is arranged around the core.

9. A transformer, characterized by ​

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