Double-split transformer and coil structure thereof

Abstract

The invention belongs to the technical field of transformer design, and particularly relates to a double-split transformer and a coil structure thereof. The coil structure of the double-split transformer comprises the first cylindrical whole body which is formed by combining the insulating materials and comprises the high-voltage coil body, and the first cylindrical whole body is provided with the plurality of through holes used for heat dissipation, so that a stronger guiding and ventilating effect can be achieved through the plurality of through holes for the high-voltage coil body of the double-split transformer, and the heat dissipation effect of the high-voltage coil body of the double-split transformer is improved. The conditions of steady flow and airflow internal circulation occurring in a single guide heat dissipation structure surrounding the coil body such as a shielding cylinder are reduced as much as possible, so that the heat dissipation performance is improved, and the heat dissipation effect is optimized; the high-voltage coil is arranged to be a whole barrel-shaped whole, and the problem that through holes are blocked among different barrel-shaped whole bodies can be avoided; moreover, the through holes with two through ends are axially corresponding air ducts with upper and lower through ends, namely, the through holes are arranged to be through relative to the two ends of the cylindrical whole body, so that the heat dissipation guiding capability is further enhanced, and the heat dissipation effect is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of transformer design, and in particular relates to a double-split transformer and a coil structure thereof. Background Art

[0002] Due to the advantages of energy saving, environmental protection and maintenance-free of dry-type transformers, energy storage dry-type transformers have been widely used in energy storage systems. As supporting unit modules for various energy storage application scenarios in energy storage systems, they connect energy storage converters and high-voltage circuit breakers, such as Figure 1 The figure shows the application scenario of the energy storage dry-type transformer in the energy storage system. In the prior art, a double-split transformer and other transformers that meet the requirements can be used in this scenario.

[0003] Existing transformers often sheath the high-voltage coil on the low-voltage coil. For example, the Chinese utility model patent with the authorization announcement number CN218241555U discloses a three-phase five-column double reverse star axial double-split rectifier transformer body insulation structure, which includes a three-phase five-column iron core, each of which is sheathed with a primary coil arranged on the outer layer and a secondary coil arranged on the inner layer. A shielding cylinder is provided between the primary coil and the secondary coil, which can achieve insulation shielding of the primary coil and the secondary coil, further reduce the transformer leakage inductance and electromagnetic interference, and also have the function of guiding ventilation, further improving the heat dissipation of the product; and a primary coil is provided between the primary coil and the secondary coil. When the coil is wound, it is divided into an upper winding and a lower winding that are symmetrical up and down, and finally cast into one piece. On the one hand, it improves the overall mechanical strength of the coil, and on the other hand, it improves the heat dissipation of the product; the secondary coil is a split secondary coil with an upper coil and a lower coil, and the upper coil and the lower coil are axially stacked through inter-segment insulating pads to ensure the coaxiality of the shielding tube; the structure of the double-split transformer mainly relies on the guided ventilation of the shielding tube between the primary coil and the secondary coil for heat dissipation, and steady flow and internal circulation of airflow may occur inside the shielding tube, causing the gas to be trapped in the shielding tube and unable to exchange gas with the outside world, resulting in poor heat dissipation effect. Summary of the invention

[0004] The object of the present invention is to provide a double-split transformer and a coil structure thereof, so as to solve the problem of poor heat dissipation of the existing double-split transformer.

[0005] In order to achieve the above-mentioned object, the present invention provides a coil structure of a double-split transformer, wherein the coil structure comprises a first cylindrical entity including a high-voltage coil body combined by insulating material, and the first cylindrical entity has a plurality of through holes for heat dissipation.

[0006] Further, the coil structure further includes a second cylindrical integral body including an upper coil winding of the low-voltage coil body and a third cylindrical integral body including a lower coil winding of the low-voltage coil body, which are respectively combined by an insulating material. The second and third cylindrical integral bodies also have a plurality of through holes for heat dissipation.

[0007] Further, the first, second, and third cylindrical integral bodies are combined by an insulating material in a manner of integral casting with the insulating material.

[0008] Further, the through holes are air ducts that are transparent at both the upper and lower ends corresponding to the axis of the coil structure; the openings at the upper end and / or the lower end of some or all of the through holes are arranged in a circular structure around the axis of the cylindrical integral body.

[0009] Further, the circular structure includes a plurality of nested rings.

[0010] Further, the high-voltage coil body includes an upper coil winding and a lower coil winding that are electromagnetically divided along the axis; the first cylindrical integral body also includes insulating parts at the upper end, the lower end, and / or between the coil windings of the high-voltage coil body.

[0011] Further, the insulating material is epoxy resin.

[0012] Further, both the second and third cylindrical integral bodies include isolation turns; the isolation turns are respectively wound outside the upper coil winding and the lower coil winding of the low-voltage coil, and the head and tail lap joints of the isolation turns are isolated by an insulating material.

[0013] Further, the coil structure further includes connection terminals and voltage-dividing terminals corresponding to the high-voltage coil body led out from the first cylindrical integral body; the connection terminals and the voltage-dividing terminals are respectively arranged on both sides of the first cylindrical integral body;

[0014] The connection terminals include connection terminals corresponding to the upper coil winding and the lower coil winding of the high-voltage coil body respectively, and are respectively used to connect the upper coil windings of three phases and the lower coil windings of three phases to form a delta connection; the voltage-dividing terminals include voltage-dividing terminals corresponding to the upper coil winding and the lower coil winding of the high-voltage coil body respectively, and are respectively used to adjust the voltage levels of the upper and lower coil windings.

[0015] The beneficial effects of the technical solution of the coil structure of the above-mentioned dual-split transformer of the present invention include: for the high-voltage coil body of the dual-split transformer, several through holes play a stronger guiding ventilation role, minimizing the occurrence of steady flow and internal air circulation in a single guiding heat dissipation structure such as a shielding cylinder surrounding the coil body, thereby improving the heat dissipation performance and optimizing the heat dissipation effect; the high-voltage coils are combined into a cylindrical whole through insulating materials, and it can also avoid the problem of through holes being blocked between different cylindrical wholes.

[0016] The present invention also provides a dual-split transformer, including a coil structure, and the coil structure includes a first cylindrical whole containing a high-voltage coil body combined through insulating materials, and several through holes for heat dissipation are provided on the first cylindrical whole.

[0017] Further, the coil structure further includes a second cylindrical whole containing the upper coil winding of the low-voltage coil body and a third cylindrical whole containing the lower coil winding of the low-voltage coil body, which are respectively combined through insulating materials, and several through holes for heat dissipation are also provided on the second and third cylindrical wholes.

[0018] Further, the first, second, and third cylindrical wholes are all combined through insulating materials in the way of integral casting with insulating materials.

[0019] Further, the through holes are air ducts that are transparent at both the upper and lower ends corresponding to the axial direction of the coil structure; the openings at the upper end and / or lower end of some or all of the through holes are arranged in a circular structure around the axis of the cylindrical whole.

[0020] Further, the circular structure includes a plurality of nested rings.

[0021] Further, the high-voltage coil body includes an upper coil winding and a lower coil winding that are axially divided electromagnetically; the first cylindrical whole also includes insulating parts at the upper end, lower end, and / or between the coil windings in the high-voltage coil body.

[0022] Further, the insulating material is epoxy resin.

[0023] Further, isolation turns are included in both the second and third cylindrical wholes; the isolation turns are respectively wound outside the upper coil winding and the lower coil winding of the low-voltage coil, and the head and tail lap joints of the isolation turns are isolated with insulating materials.

[0024] Further, the coil structure also includes connection terminals and voltage-dividing terminals corresponding to the high-voltage coil body led out from the first cylindrical whole; the connection terminals and the voltage-dividing terminals are respectively arranged on both sides of the first cylindrical whole;

[0025] The connection terminals include the connection terminals corresponding to the upper coil winding and the lower coil winding of the high-voltage coil body respectively, which are respectively used to connect the upper coil windings of three phases and the lower coil windings of three phases to form a delta connection; the voltage-dividing terminals include the voltage-dividing terminals corresponding to the upper coil winding and the lower coil winding of the high-voltage coil body respectively, which are respectively used to adjust the voltage levels of the upper and lower coil windings.

[0026] The beneficial effects of the technical solution of the above-mentioned double-split transformer of the present invention include: for the high-voltage coil body of the double-split transformer, several through holes play a stronger guiding ventilation role, minimizing the occurrence of steady flow and internal air circulation in the single guiding heat dissipation structure such as the shielding cylinder surrounding the coil body, thereby improving the heat dissipation performance and optimizing the heat dissipation effect; the high-voltage coils are combined into a cylindrical whole through insulating materials, and it can also avoid the problem of through holes being blocked between different cylindrical wholes. Description of the Drawings

[0027] Figure 1 It is a schematic diagram of the application scenario of the energy storage dry-type transformer in the energy storage system in the background technology of the present invention;

[0028] Figure 2 It is a cross-sectional view of the first cylindrical whole in the coil structure in the embodiment of the double-split transformer of the present invention;

[0029] Figure 3 It is a schematic diagram of the connection structure corresponding to the second and third cylindrical wholes in the coil structure in the embodiment of the double-split transformer of the present invention;

[0030] Figure 4 It is a top view of the first cylindrical whole in the embodiment of the double-split transformer of the present invention;

[0031] Figure 5 It is a top view of the second and third cylindrical wholes in the embodiment of the double-split transformer of the present invention;

[0032] Figure 6 It is a side view of the overall structure of the double-split transformer in the embodiment of the double-split transformer of the present invention;

[0033] Figure 7 It is a front view of the overall structure of the double-split transformer in the embodiment of the double-split transformer of the present invention;

[0034] In the figure, 1 is the iron core, 2 is the first lead copper bar, 3 is the second lead copper bar, 4 is the connection bar, 5 is the spacer, 6 is the upper coil winding of the high-voltage coil, 7 is the lower coil winding of the high-voltage coil, 8 is the second cylindrical integral body, 9 is the third cylindrical integral body, 10 are the voltage-dividing terminals corresponding to the upper coil winding and the lower coil winding of the high-voltage coil respectively, 11 is the intermediate spacer, 12 is the upper clamping piece, 13 is the lower clamping piece, 14 is the connection copper bar, 15 is the isolation turn lead, 16 are the connection terminals corresponding to the upper coil winding and the lower coil winding of the high-voltage coil respectively, 17 is the first connecting rod, 18 is the second connecting rod, 19 is the lead wire for connecting the connection terminal 16, 20 are the lead wires of the upper coil winding and the lower coil winding of the high-voltage coil, 21 is the grounding bolt, 22 is the isolation turn, 23 is the air duct of the first cylindrical integral body, 24 is the insulating material for setting at the head and tail lap joint of the isolation turn, 25 are the insulating parts at the upper end of the upper coil winding and the lower end of the lower coil winding of the high-voltage coil, 26 is the insulating part between the upper coil and the lower coil winding of the high-voltage coil, 27 is the first cylindrical integral body, 28 is the air duct of the second and third cylindrical integral bodies. Detailed implementation mode

[0035] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0036] Embodiment of double-split transformer

[0037] This embodiment provides a technical solution of a double-split transformer. The double-split transformer includes a coil structure. The coil structure includes a first cylindrical integral body containing a high-voltage coil body combined by an insulating material, wherein the high-voltage coil body includes an upper coil winding and a lower coil winding axially divided electromagnetically. The first cylindrical integral body is provided with a plurality of through holes for heat dissipation. Thus, for the high-voltage coil body of the double-split transformer, a stronger guiding ventilation effect can be achieved through the plurality of through holes, and the situation of steady flow and internal air circulation in a single guiding heat dissipation structure such as a shielding cylinder surrounding the coil body can be minimized, thereby improving the heat dissipation performance and optimizing the heat dissipation effect. The high-voltage coil is set as an entire cylindrical integral body, and the problem of blocking the through holes between different cylindrical integral bodies can also be avoided. To ensure the insulation performance of the high-voltage coil body, the first cylindrical integral body also includes insulating parts at the upper end, lower end and between the coil windings in the coil body, so that the coil body and the corresponding insulating parts can be combined into one body, which is convenient for overall application and improves the overall strength. In other embodiments, only some of the insulating parts can also be cast into the cylindrical integral body.

[0038] Moreover, the coil structure further includes a second cylindrical integral body including the upper coil winding of the low-voltage coil body and a third cylindrical integral body including the lower coil winding of the low-voltage coil body, which are respectively combined by an insulating material. The second and third cylindrical integral bodies also have a plurality of through holes for heat dissipation. Thus, for the two coil windings (the upper coil winding and the lower coil winding of the low-voltage coil body) split from the low-voltage coil body of the double-split transformer, a stronger guiding ventilation effect can be achieved through a plurality of through holes. Combining with the above-mentioned guiding ventilation design for the high-voltage coil, guiding ventilation can be carried out at the high-voltage coil and the low-voltage coil respectively, and the heat dissipation efficiency is higher. The low-voltage coil body is divided into two cylindrical integral bodies, which can also avoid forming a guiding structure similar to a shielding cylinder around the low-voltage coil body between the cylindrical integral body corresponding to the high-voltage coil and the cylindrical integral body corresponding to the low-voltage coil, thereby reducing the steady current and internal air circulation inside the coil structure to improve the heat dissipation performance.

[0039] In this embodiment, the through hole with both ends penetrating is an air duct with both upper and lower ends axially corresponding, that is, the through hole is set to penetrate both ends of the cylindrical integral body, further enhancing the heat dissipation guiding ability and improving the heat dissipation effect.

[0040] Taking Figure 2 the structure corresponding to the high-voltage coil of the double-split transformer shown as an example, referring to Figure 2 , in the first cylindrical integral body 27 including the high-voltage coil body of the double-split transformer, the air duct 23 penetrates through the upper coil winding 6 and the lower coil winding 7 of the high-voltage coil to achieve the effect of both upper and lower ends axially corresponding; specifically, the first cylindrical integral body 27 also includes insulating parts 25 at the upper end of the upper coil winding and the lower end of the lower coil winding, and insulating part 26 between the upper coil and the lower coil winding; specifically, the above-mentioned first, second, and third cylindrical integral bodies are combined by an insulating material in the way of integral casting with an insulating material. The insulating material is epoxy resin. Then, components such as the upper coil winding 6 (which can also be simply referred to as the upper high-voltage coil) and the lower coil winding 7 (which can also be simply referred to as the lower high-voltage coil) of the high-voltage coil, insulating parts 25 at the upper end of the upper coil winding and the lower end of the lower coil winding, and insulating part 26 between the upper coil and the lower coil winding are integrally cast by epoxy resin into the first cylindrical integral body 27 for sleeving outside the structure corresponding to the low-voltage coil of the double-split transformer; in other embodiments, only one or several of the insulating parts 25 at the upper end of the upper coil winding and the lower end of the lower coil winding and insulating part 26 between the upper coil and the lower coil winding can be cast in the first cylindrical integral body 27.

[0041] The upper coil winding and the lower coil winding of the low-voltage coil of the double-split transformer are integrally cast by epoxy resin distribution into two other cylindrical bodies, namely the second cylindrical body 8 and the third cylindrical body 9. Since the second cylindrical body 8 and the third cylindrical body 9 are distributed corresponding to the upper coil winding and the lower coil winding of the low-voltage coil, the second cylindrical body 8 can be directly regarded as the upper coil winding of the low-voltage coil, and the third cylindrical body 9 can be regarded as the lower coil winding of the low-voltage coil. Their specific connection relationship in the double-split transformer is as shown in Figure 3 ; the second cylindrical body 8 and the third cylindrical body 9 can be sleeved on the core column of the core of the double-split transformer. In other embodiments, the insulating materials used for casting the first, second, and third cylindrical bodies can be insulating materials of different types, which can be flexibly selected according to specific requirements.

[0042] Actually, on the premise of not affecting the electromagnetic structure of the winding and ensuring the integrity of the winding, the structures of these air ducts are interspersed between the windings of the coil winding of the coil body; before casting, the coil winding is wound according to the tooling with the air duct positions reserved in advance, and then cast with insulating materials. After casting is completed, the tooling is removed to obtain a cylindrical body with through holes (air ducts) with both ends transparent interspersed between the coil windings of the coil body.

[0043] To make the distribution position of the air ducts more matched with the distribution position of the coil body in each cylindrical body to achieve a better ventilation and heat dissipation effect, the upper and lower openings of some or all of the air ducts in the coil structure are arranged in a circular structure around the axis of the cylindrical body, as shown in Figure 4 which is the top view of the first cylindrical body. In this embodiment, the upper and lower openings of the air duct 23 of the cylindrical body corresponding to the high-voltage coil are all arranged in a single circular arrangement around the axis of the cylindrical body; and, to adapt to different high-voltage current magnitudes or meet different temperature rise or heat dissipation requirements, the circular structure can include multiple nested circles, as shown in Figure 5 the top views of the second and third cylindrical bodies (this circular structure including multiple nested circles can be flexibly applied to the structures corresponding to the low-voltage coil and the high-voltage coil), where the upper and lower openings of the air duct 28 are all arranged in two nested circular arrangements around the axis of the cylindrical body; in other embodiments, the air ducts in the cylindrical bodies corresponding to the high-voltage coil and the low-voltage coil can both be set to be arranged in a single circular arrangement or in two or more nested circular arrangements, or the air duct 23 corresponding to the high-voltage coil is arranged in multiple nested circular arrangements while the air duct 28 corresponding to the low-voltage coil is arranged in a single circular arrangement, etc., which can all be freely set according to the actual working conditions and requirements. Since the air ducts are not necessarily straight cylindrical structures parallel to the axis, in other embodiments, the arrangement methods presented by the upper and lower openings of the air ducts are not necessarily the same, and can also be set according to the actual working conditions and requirements.

[0044] An isolation turn is provided between the low-voltage coil and the high-voltage coil of the double-split transformer; the isolation turn is respectively wound around the outer sides of the upper coil winding and the lower coil winding of the low-voltage coil, and the head and tail lap joints of the isolation turn are isolated by insulating materials; in this embodiment, the isolation turn is directly cast in the second and third cylindrical integrations, that is, both the second and third cylindrical integrations contain the isolation turn. Specifically, the isolation turn is a foil strip made of metal such as copper foil or aluminum foil, with the same winding height as the conductor of the upper low-voltage coil or the lower low-voltage coil, and is wound around one turn on the outer sides of the upper low-voltage coil and the lower low-voltage coil. The head and tail of the isolation turn are not connected, and the head and tail lap joints are isolated by insulating materials so as not to form a closed turn, and the tail end of the isolation turn is led out by the isolation turn lead 15, as Figure 3 shown; or as Figure 7 shown, the isolation turn leads 15 of the three-phase coils of the double-split transformer are connected together by the connecting copper bus 14 and connected to the grounding bolts 21 of the upper clamping piece 12 and the lower clamping piece 13 to form grounding; the functions of the isolation turn are, one, to improve the capacitance between the isolation turn and the high- and low-voltage coils, making the electric field between the high- and low-voltage coils uniform, and two, when a large current generated during a short-circuit fault of the transformer passes through the isolation turn lead and accesses the ground, to avoid burning the subsequent connecting equipment due to the transformer fault.

[0045] In this embodiment, the coil structure of the double-split transformer further includes connection terminals and voltage-dividing terminals corresponding to the high-voltage coil led out from the first cylindrical integration; the connection terminals and the voltage-dividing terminals are respectively arranged on both sides of the first cylindrical integration, as Figure 2 shown, the voltage-dividing terminals corresponding to the high-voltage coil include voltage-dividing terminals 10 corresponding to the upper coil winding and the lower coil winding respectively, which are respectively used to adjust the voltage levels of the upper and lower high-voltage coils; the connection terminals include connection terminals 16 corresponding to the upper coil winding and the lower coil winding respectively, which are respectively used to connect the three-phase upper coil windings and the three-phase lower coil windings to form a delta connection; referring to Figure 4 , by arranging the voltage-dividing terminals 10 and the connection terminals 16 on both sides of the first cylindrical integration respectively, it is possible to avoid problems such as insufficient insulation distance caused by the height dimension limitation of the high-voltage coil or coil discharge faults and burning caused by insufficient electrical insulation distance between the connection terminals and the voltage-dividing terminals when they are on the same plane.

[0046] Specifically, the overall structure example of the double-split transformer refers to Figure 6 and Figure 7 , except for the first cylindrical integration 27 (where the first cylindrical integration 27 includes components such as the air duct 23 in the first cylindrical integration, the upper coil winding 6 of the high-voltage coil body, the lower coil winding 7, the insulating parts 25 at the upper end of the upper coil winding 6 and the lower end of the lower coil winding 7, and the insulating part 26 between the upper coil and the lower coil winding, so Figure 6 ,Figure 7 In addition to the components corresponding to the coil structures such as the first cylindrical body 27 (the components are not shown in the figure), the second cylindrical body 8 (i.e., the upper low-voltage coil), and the third cylindrical body 9 (i.e., the lower low-voltage coil), it also includes the iron core 1, the upper clamping piece 12, the lower clamping piece 13, the spacer block 5, the first lead copper bar 2, the second lead copper bar 3, the connecting bar 4, the connecting copper bar 14, the first connecting rod 17, the second connecting rod 18 and other components. The upper clamping piece 12 and the lower clamping piece 13 are made by cutting, bending and welding a steel plate with a certain strength. The upper clamping piece 12 and the lower clamping piece 13 are respectively arranged on both sides of the iron core 1 and at the upper and lower ends of the iron core. The second cylindrical body 8 and the third cylindrical body 9 are axially sleeved on the three core columns of the iron core 1. The second cylindrical body 8 is sleeved above the core column of the iron core 1, and the third cylindrical body 9 is sleeved below the core column of the iron core 1; the first cylindrical body 27 is correspondingly sleeved outside the second cylindrical body 8 and the third cylindrical body 9; the second cylindrical body 8 and the third cylindrical body 9 are isolated and supported by the intermediate spacer block 11 (in this embodiment, the air ducts 28 respectively belong to a part of the second cylindrical body 8 and the third cylindrical body 9, but since they are inside the second cylindrical body 8 and the third cylindrical body 9, so Figure 6 、 Figure 7 they are not shown in the figure); the lower clamping piece 13 supports the spacer block 5, and the spacer block 5 supports the lower part of the first cylindrical body 27 and the third cylindrical body 9. Thus, the spacer block 5, the upper clamping piece 12 and the lower clamping piece 13 press and fix the first cylindrical body 27, the second cylindrical body 8 and the third cylindrical body 9, so that the first cylindrical body 27, the second cylindrical body 8 and the third cylindrical body 9 can be fixed on the core column. It should be noted that, in order to show the overall structure of pressing the second cylindrical body 8 and the third cylindrical body 9, Figure 7 the structure of the intermediate spacer block 11 is drawn by perspective in the figure. In actual situations, the intermediate spacer block 11 is blocked by the first cylindrical body 27.

[0047] The coils of the three core columns form the three-phase high-voltage coils A, B, C and the three-phase low-voltage coils a, b, c of the transformer. The first connecting rod 17 and the second connecting rod 18 connect the upper connection terminals 16 of the first cylindrical integral body 27 containing the three-phase high-voltage coils to form a delta connection, and connect the lower connection terminals 16 of the first cylindrical integral body 27 to form a delta connection. The lead wire 19 connects the upper and lower connection terminals 16 of the first cylindrical integral body 27, and connects the upper coil winding 6 and the lower coil winding 7 of the high-voltage coil in the first cylindrical integral body 27 to form a parallel connection and lead out the joint through the lead wire 20; at the upper end of the second cylindrical integral body 8, there are a first lead-out copper bar 2 (corresponding to a1, b1, c1 for the three-phase coils respectively) and a second lead-out copper bar 3 (corresponding to x1, y1, z1 for the three-phase coils respectively). The second lead-out copper bar 3 (corresponding to x1, y1, z1 for the three-phase coils respectively) of the second cylindrical integral body 8 containing the three-phase upper low-voltage coils is connected by the connecting bar 4 to form a Y connection. At the lower end of the third cylindrical integral body 9, there are a first lead-out copper bar 2 (corresponding to a2, b2, c2 for the three-phase coils respectively) and a second lead-out copper bar 3 (corresponding to x2, y2, z2 for the three-phase coils respectively). The second lead-out copper bar 3 (corresponding to x2, y2, z2 for the three-phase coils respectively) of the third cylindrical integral body 9 containing the three-phase lower low-voltage coils is connected by the connecting bar 4 to form a Y connection; a foil isolation turn 22 made of metal such as a single turn of copper foil or aluminum foil is wound around the outside of the upper low-voltage coil and the lower low-voltage coil in the second cylindrical integral body 8 and the third cylindrical integral body 9. The head and tail lap joints are isolated by the insulating material 24. The isolation turn 22 is also cast in the second cylindrical integral body 8 and the third cylindrical integral body 9 respectively, and is led out by the isolation turn lead wire 15; the isolation turn lead wire 15 is placed on the opposite side of the lead-out copper bars 2 and 3. The isolation turn lead wires 15 of the second cylindrical integral body 8 and the third cylindrical integral body 9 of the three core columns are connected together by the connecting copper bar 14 and then connected to the grounding bolt 21. Since the specific connection principle and connection method of the three-phase coils belong to the prior art, they will not be described in detail here.

[0048] Embodiment of the coil structure of the double-split transformer

[0049] This embodiment provides a technical solution for the coil structure of a double - split transformer. The coil structure includes a first cylindrical integral body formed by combining through an insulating material and containing a high - voltage coil body. The high - voltage coil body includes an upper coil winding and a lower coil winding axially divided electromagnetically. The first cylindrical integral body has several through - holes for heat dissipation. Thus, for the high - voltage coil body of the double - split transformer, stronger guiding ventilation can be achieved through several through - holes, minimizing the steady - flow and internal air - circulation in a single guiding heat - dissipation structure such as a shielding cylinder surrounding the coil body, thereby improving the heat - dissipation performance and optimizing the heat - dissipation effect. The high - voltage coil is set as an entire cylindrical integral body, which can also avoid the problem of through - holes being blocked between different cylindrical integral bodies. To ensure the insulation performance of the high - voltage coil body, the first cylindrical integral body also includes insulating parts between the upper end, the lower end of the coil windings in the coil body and between the coil windings.

[0050] Moreover, the coil structure further includes a second cylindrical integral body formed by combining through an insulating material and containing the upper coil winding of the low - voltage coil body, and a third cylindrical integral body formed by combining through an insulating material and containing the lower coil winding of the low - voltage coil body. The second and third cylindrical integral bodies also have several through - holes for heat dissipation. Thus, for the two coil windings (the upper coil winding and the lower coil winding of the low - voltage coil body) split from the low - voltage coil body of the double - split transformer, stronger guiding ventilation can be achieved through several through - holes. Combining with the above - mentioned guiding ventilation design for the high - voltage coil, guiding ventilation can be carried out at the high - voltage coil and the low - voltage coil respectively, with higher heat - dissipation efficiency. The low - voltage coil body is divided into two cylindrical integral bodies, which can also avoid the formation of a guiding structure similar to a shielding cylinder surrounding the low - voltage coil body between the cylindrical integral body corresponding to the high - voltage coil and the cylindrical integral body corresponding to the low - voltage coil, thereby reducing the steady - flow and internal air - circulation in the coil structure to improve the heat - dissipation performance.

[0051] In this embodiment, the through - hole that is transparent at both ends is an air duct that is transparent at the upper and lower ends corresponding axially, that is, the through - hole is set to be transparent at both ends relative to the cylindrical integral body, further enhancing the heat - dissipation guiding ability and improving the heat - dissipation effect.

[0052] Specifically, the first, second, and third cylindrical integral bodies are combined through an insulating material in the way of integral casting with an insulating material. The insulating material is epoxy resin. In other embodiments, the insulating materials used for casting the first, second, and third cylindrical integral bodies can be of different types, which can be flexibly selected according to requirements.

[0053] Actually, on the premise of not affecting the electromagnetic structure of the winding and ensuring the integrity of the winding, the structures of these air ducts are interspersed between the windings of the coil winding of the coil body; before casting, first wind the coil winding according to the tooling with the positions of the air ducts reserved as pre-designed, and then cast with insulating materials. After the casting is completed, remove the tooling to obtain a cylindrical integral body with through holes (air ducts) with both ends transparent interspersed between the coil windings of the coil body.

[0054] To make the distribution positions of the air ducts more matched with the distribution positions of the coil bodies in each cylindrical integral body, so as to achieve a better ventilation and heat dissipation effect, the openings at the upper and lower ends of some or all of the air ducts in the coil structure are arranged in a circular structure around the axis of the cylindrical integral body. For example, Figure 4 The figure shown is the top view of the first cylindrical integral body. In this embodiment, the openings at the upper and lower ends of the air duct 23 of the cylindrical integral body corresponding to the high-voltage coil are all arranged in a single circular shape around the axis of the cylindrical integral body; and, to adapt to different high-voltage current magnitudes or meet different temperature rise or heat dissipation requirements, the circular structure can include multiple nested circles, such as Figure 5 The figure shown is the top view of the cylindrical integral body corresponding to the low-voltage coil (this circular structure including multiple nested circles can be flexibly applied to the structures corresponding to the low-voltage coil and the high-voltage coil), where the openings at the upper and lower ends of the air duct 28 are all arranged in two nested circles around the axis of the cylindrical integral body; in other embodiments, the air ducts in the first, second, and third cylindrical integral bodies can all be set to be arranged in a single circular shape or in two or even more nested circles, or the air duct 23 in the first cylindrical integral body is arranged in multiple nested circles while the air ducts 28 in the second and third cylindrical integral bodies are arranged in a single circular shape, etc., and can all be freely set according to the actual working conditions and requirements. Since the air ducts are not necessarily straight cylindrical structures parallel to the axis, in other embodiments, the arrangement ways of the openings at the upper and lower ends of the air ducts are not necessarily the same, and can also be specifically set according to the actual working conditions and requirements.

[0055] Specifically, the coil structure of the double-split transformer in this embodiment is actually the coil structure included in the double-split transformer in the above double-split transformer embodiment; since the other settings and principles of the coil structure related to the double-split transformer in this embodiment have been described in detail in the above double-split transformer embodiment, they will not be elaborated here.

[0056] The present invention has the following characteristics:

[0057] 1) The coil structure includes a first cylindrical integral body of the high-voltage coil body, and there are several through holes that are open at both ends for heat dissipation on the cylindrical integral body. Thus, for the high-voltage coil body of the double-split transformer, a stronger guiding ventilation effect can be achieved through several through holes, minimizing the occurrence of steady flow and internal air circulation in a single guiding heat dissipation structure such as a shielding cylinder that surrounds the coil body, thereby improving the heat dissipation performance and optimizing the heat dissipation effect; the high-voltage coils are combined into a cylindrical integral body through insulating materials, and it can also avoid the problem of through holes being blocked between different cylindrical integral bodies;

[0058] 2) The coil structure also includes a second cylindrical integral body formed by combining through insulating materials and including the upper coil winding of the low-voltage coil body and a third cylindrical integral body formed by combining through insulating materials and including the lower coil winding of the low-voltage coil body, and both also have several through holes for heat dissipation. Thus, it can also achieve a stronger guiding ventilation effect through several through holes for the two coil windings (the upper coil winding and the lower coil winding of the low-voltage coil body) split from the low-voltage coil body of the double-split transformer. Combining with the above-mentioned guiding ventilation design for the high-voltage coil, guiding ventilation can be carried out at the high-voltage coil and the low-voltage coil respectively, with higher heat dissipation efficiency; the low-voltage coil body is divided into two cylindrical integral bodies, and it can also avoid the formation of a guiding structure similar to a shielding cylinder that surrounds the low-voltage coil body between the cylindrical integral body corresponding to the high-voltage coil and the cylindrical integral body corresponding to the low-voltage coil, thereby reducing the occurrence of steady flow and internal air circulation inside the coil structure to improve the heat dissipation performance.

[0059] 3) The through holes that are open at both ends are air ducts that are open at the upper and lower ends corresponding to the axis of the coil structure, that is, the through holes are set to be open at both ends relative to the cylindrical integral body, further enhancing the heat dissipation guiding ability and improving the heat dissipation effect;

[0060] 4) The openings at the upper and lower ends of some or all of the through holes are arranged in a circular structure around the axis of the cylindrical integral body, which can make the distribution position of the air ducts more matched with the distribution position of the coil body in the cylindrical integral body to achieve a better ventilation and heat dissipation effect; and the circular structure includes multiple nested rings, which can adapt to different high-voltage current magnitudes or meet different temperature rise or heat dissipation requirements.

[0061] It should be understood that the above specific embodiments of the present invention are only used for exemplary illustration or explanation of the principle of the present invention, and do not constitute a limitation to the present invention.

Claims

1. A coil structure of a double-split transformer, characterized in that, The coil structure includes a first cylindrical integral body containing a high-voltage coil body, which is combined by an insulating material, and a plurality of through holes for heat dissipation are provided on the first cylindrical integral body.

2. The coil structure of the double-split transformer according to claim 1, characterized in that, The coil structure further includes a second cylindrical integral body containing the upper coil winding of the low-voltage coil body and a third cylindrical integral body containing the lower coil winding of the low-voltage coil body, which are respectively combined by an insulating material, and a plurality of through holes for heat dissipation are also provided on the second and third cylindrical integral bodies.

3. The coil structure of the double-split transformer according to claim 2, characterized in that, The first, second, and third cylindrical integral bodies are all integrally cast by an insulating material in the way of being combined by an insulating material.

4. The coil structure of the double-split transformer according to any one of claims 1-3, characterized in that, The through holes are air ducts that are transparent at both the upper and lower ends corresponding to the axis of the coil structure; the openings at the upper end and / or the lower end of some or all of the through holes are arranged in a circular structure around the axis of the cylindrical integral body.

5. The coil structure of the double-split transformer according to claim 4, characterized in that, The circular structure includes a plurality of nested rings in sequence.

6. The coil structure of the double-split transformer according to any one of claims 1-3, characterized in that The high-voltage coil body includes an upper coil winding and a lower coil winding that are axially divided electromagnetically; the first cylindrical integral body also includes insulating parts at the upper end, the lower end, and / or between the coil windings in the high-voltage coil body.

7. The coil structure of the double-split transformer according to any one of claims 1-3, characterized in that, The insulating material is epoxy resin.

8. The coil structure of the double-split transformer according to claim 2 or 3, characterized in that, Both the second and third cylindrical integral bodies include isolation turns; the isolation turns are respectively wound outside the upper coil winding and the lower coil winding of the low-voltage coil, and the head and tail lap joints of the isolation turns are isolated by an insulating material.

9. The coil structure of the double-split transformer according to any one of claims 1-3, characterized in that, The coil structure further includes connection terminals and voltage-dividing terminals corresponding to the high-voltage coil body led out from the first cylindrical integral body; the connection terminals and the voltage-dividing terminals are respectively arranged on both sides of the first cylindrical integral body; The connection terminals include connection terminals corresponding to the upper coil winding and the lower coil winding of the high-voltage coil body respectively, which are respectively used to connect the upper coil windings of three phases and the lower coil windings of three phases to form a delta connection; the voltage-dividing terminals include voltage-dividing terminals corresponding to the upper coil winding and the lower coil winding of the high-voltage coil body respectively, which are respectively used to adjust the voltage levels of the upper and lower coil windings.

10. A double-split transformer, characterized in that, It includes a coil structure, and the coil structure is the coil structure of the double-split transformer as described in any one of claims 1-9.

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