Voltage regulating coil and rectifier transformer

Abstract

This application discloses a voltage regulating coil and a rectifier transformer, relating to the field of transformer technology. The coil includes a coil body, tap leads, and an insulation support structure. The coil body is formed by multiple insulated wires connected in parallel and concentrically wound. Multiple voltage regulating tap positions are arranged axially on the coil body, and the insulated wires are arranged radially along the coil body to form multiple spiral winding areas. The tap leads are connected to each voltage regulating tap position and extended to the outside of the coil body. The insulation support structure is disposed on the coil body and forms insulation and heat dissipation channels between adjacent spiral winding areas. The voltage regulating coil provided by this application improves the overall structure of the voltage regulating coil, and can simultaneously meet the requirements of voltage regulation function, wire arrangement, insulation and heat dissipation, and lead connection.

Description

Technical Field

[0001] This application relates to the field of transformer technology, and more specifically, to a voltage regulating coil and a rectifier transformer. Background Technology

[0002] The voltage regulating coil is a crucial component in a transformer used for voltage regulation. It typically employs multiple tap positions connected to tap changers to meet voltage regulation requirements under various operating conditions. For high-current transformers, the voltage regulating coil generally uses a structure with multiple conductors wound in parallel to improve its current-carrying capacity and operational reliability.

[0003] In related technologies, the number of conductors, winding method, tap positions, and lead arrangement of a voltage regulating coil affect its electrical performance, insulation performance, heat dissipation performance, and structural stability. As the number of voltage regulating positions and parallel conductors increases, the internal conductor arrangement, tap lead-out, and insulation and heat dissipation structure of the coil become more complex. If the structural design is not reasonable, it may affect the operational stability and performance of the voltage regulating coil.

[0004] Therefore, how to improve the overall structure of the voltage regulating coil to take into account the needs of voltage regulation function, wire arrangement, insulation and heat dissipation, and lead connection has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the purpose of this application is to provide a voltage regulating coil to improve the overall structure of the voltage regulating coil, so as to take into account the needs of voltage regulation function, wire arrangement, insulation and heat dissipation and lead connection.

[0006] Another object of this application is to provide a rectifier transformer having the above-described voltage regulating coil.

[0007] To achieve the above objectives, this application provides the following technical solution:

[0008] A voltage regulating coil, comprising:

[0009] The coil body is formed by multiple insulated wires connected in parallel and concentrically wound, and the coil body is provided with multiple voltage adjustment tap positions along the axial direction. Each of the insulated wires is arranged radially along the coil body to form multiple spiral winding areas.

[0010] The tap leads are connected to each of the voltage regulating tap positions and led out to the outside of the coil body;

[0011] An insulating support structure is disposed on the coil body and forms an insulating heat dissipation channel between adjacent spiral winding areas.

[0012] Optionally, in the above-mentioned voltage regulating coil, the number of insulated wires is 17, all of which have the same specifications, and the number of voltage regulating tap positions is 17.

[0013] Optionally, in the above-mentioned voltage regulating coil, there are nine spiral winding regions, and the nine spiral winding regions are arranged in a centrally symmetrical manner.

[0014] Optionally, in the above-mentioned voltage regulating coil, the helix angle of each of the spiral winding regions is the same.

[0015] Optionally, in the above-mentioned voltage regulating coil, the spiral winding region includes eight first winding regions and one second winding region, wherein the first winding regions are provided with two insulated wires and the second winding region is provided with one insulated wire.

[0016] Optionally, in the above-mentioned voltage regulating coil, the second winding region is provided with an insulation compensation member so that the radial dimension of the second winding region matches the radial dimension of the first winding region.

[0017] Optionally, in the above-mentioned voltage regulating coil, each of the voltage regulating tap positions is spaced apart along the axial direction of the coil body, and the difference in the number of winding turns between adjacent voltage regulating tap positions is equal.

[0018] Optionally, in the above-mentioned voltage regulating coil, the insulation support structure includes an inter-turn insulation component, an end insulation component, and an oil duct insulation pad. The inter-turn insulation component is disposed between the insulated wires of adjacent turns, the end insulation component is disposed at the axial end of the coil body, and the oil duct insulation pad is disposed between adjacent spiral winding areas.

[0019] Optionally, in the above-mentioned voltage regulating coil, the oil passage insulating pad forms an insulating heat dissipation channel that runs through the axial direction of the coil body between adjacent spiral winding areas.

[0020] A rectifier transformer includes an on-load tap changer and a voltage regulating coil as described in any of the preceding claims, wherein the tap lead is connected to the on-load tap changer.

[0021] The voltage regulating coil provided in this application can be formed by multiple insulated wires connected in parallel and concentrically wound into a coil body. It can also have multiple voltage regulating tap positions along the axial direction, meeting the requirements for multi-level voltage regulation and high-current operation. The insulated wires are arranged radially along the coil body, forming multiple helical winding areas, which helps improve the regularity of the wire arrangement and the stability of the coil structure. The tap leads are connected to the corresponding voltage regulating tap positions and led out to the outside of the coil body, facilitating connection to external voltage regulating devices. The insulating support structure forms insulating heat dissipation channels between adjacent helical winding areas, which helps improve the insulation and heat dissipation performance of the coil, thereby improving the operational reliability of the voltage regulating coil.

[0022] The technical features mentioned above, those to be mentioned below, and those shown individually in the accompanying drawings can be combined arbitrarily, provided that the combined technical features are not contradictory. All feasible combinations of features are those explicitly described herein. Any one of the multiple sub-features contained in the same statement can be applied independently, without necessarily being applied together with other sub-features. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of the voltage regulating coil provided in the embodiments of this application;

[0025] Figure 2 A cross-sectional view of the radial arrangement of the conductors provided in an embodiment of this application;

[0026] The annotations in the attached figures are explained as follows:

[0027] Among them, 100 is the voltage regulating coil, 10 is the coil body, 11 is the insulated wire, 20 is the insulated heat dissipation channel, 30 is the first winding area, 40 is the second winding area, 50 is the insulation compensation component, 60 is the inter-turn insulation component, and 70 is the end insulation component. Detailed Implementation

[0028] The core of this application is to provide a voltage regulating coil to improve the overall structure of the voltage regulating coil, so as to take into account the needs of voltage regulation function, wire arrangement, insulation and heat dissipation and lead connection.

[0029] Another key aspect of this application is to provide a rectifier transformer having the aforementioned voltage regulating coil.

[0030] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0031] In related technologies, rectifier transformers are crucial equipment in DC power supply systems used in metallurgy, electrolysis, chemical engineering, and electric drive industries. They typically require voltage regulation based on grid voltage fluctuations and load changes. The voltage regulating coil, as the core component for achieving voltage regulation, directly affects the transformer's voltage regulation accuracy, operational stability, loss level, and short-circuit withstand capability due to factors such as the number of conductors, winding method, number of taps, lead-out method, and insulation and heat dissipation structure.

[0032] Traditional voltage regulating coils mostly employ a conventional helical winding structure. When the conductor arrangement of the voltage regulating coil is not regular or symmetrical, it can easily lead to uneven leakage flux distribution, resulting in increased additional losses and localized heating. Simultaneously, uneven leakage flux distribution may also reduce the mechanical stability of the coil under short-circuit impacts, posing a risk of winding deformation or insulation damage. Furthermore, some voltage regulating coils use a design with fewer stages and more turns, making it difficult to meet the requirements of refined voltage regulation; adding complex tap windings or tap structures may further increase coil size, structural complexity, manufacturing costs, and lead arrangement difficulties.

[0033] Therefore, such as Figure 1 As shown in the illustration, this application discloses a voltage regulating coil 100, including a coil body 10, tap leads, and an insulation support structure. The coil body 10 can be formed by multiple insulated wires 11 connected in parallel and concentrically wound, and multiple voltage regulating tap positions can be arranged along the axial direction to meet the requirements of multi-level voltage regulation and high-current operation. Each insulated wire 11 is arranged radially along the coil body 10 to form multiple helical winding areas, which helps improve the regularity of the wire arrangement and the stability of the coil structure. The tap leads are connected to each voltage regulating tap position and led out to the outside of the coil body 10, facilitating connection with external voltage regulating devices. The insulation support structure forms insulating heat dissipation channels 20 between adjacent helical winding areas, which helps improve the insulation and heat dissipation performance of the coil, thereby improving the operational reliability of the voltage regulating coil 100.

[0034] The following will combine Figure 1 and Figure 2 The voltage regulating coil 100 disclosed in the embodiments of this application will be explained and described in detail.

[0035] like Figure 1As shown, the coil body 10 can be formed by multiple insulated wires 11 connected in parallel and concentrically wound. The coil body 10 has multiple voltage adjustment tap positions along its axial direction, and each insulated wire 11 is arranged radially along the coil body 10 to form multiple spiral winding areas. Simultaneously, tap leads are connected to each voltage adjustment tap position and led out to the outside of the coil body 10. Furthermore, an insulating support structure is provided on the coil body 10, forming insulating heat dissipation channels 20 between adjacent spiral winding areas.

[0036] In the above embodiments, by connecting multiple insulated wires 11 in parallel and concentrically winding them to form the coil body 10, the current-carrying capacity of the voltage regulating coil 100 can be improved, making it suitable for the use of high-current rectifier transformers. By setting multiple voltage regulating tap positions along the axial direction of the coil body 10, multi-level voltage regulation function can be realized, and the voltage regulating coil 100 can cooperate with tap changers for voltage regulation. By forming multiple spiral winding regions in the radial direction with multiple insulated wires 11, the regularity of the wire arrangement can be improved, and the stress state and leakage flux distribution inside the coil can be improved. By forming insulating heat dissipation channels 20 between adjacent spiral winding regions, the insulation and oil flow heat dissipation requirements between regions can be taken into account, thereby improving the operational reliability of the voltage regulating coil 100.

[0037] In some embodiments, such as Figure 1 and Figure 2 As shown, the number of insulated wires 11 can be 17, and each insulated wire 11 has the same specification. Simultaneously, there can be 17 voltage regulating tap positions. Specifically, the 17 insulated wires 11 can be rectangular insulated wires of the same specification, such as oxygen-free copper rectangular insulated wires. The length, wire diameter, and insulation thickness of each insulated wire 11 can be consistent, ensuring that each insulated wire 11 has relatively consistent electrical characteristics when operating in parallel. This facilitates uniform current distribution and prevents localized heating caused by excessive current in some wires. It should be noted that in the above embodiment, the combination of "17 wires" and "17 voltage regulating tap positions" forms a coil structure suitable for 17 voltage regulation levels. By winding 17 insulated wires 11 in parallel, the overall winding height or the space occupied by the winding turns can be reduced while meeting the requirements of the number of voltage regulation stages. This makes the voltage regulating coil 100 have the characteristics of fewer turns, more stages and a compact structure. Compared with the scheme that requires additional complex voltage regulating windings, the embodiment of this application can realize multi-stage voltage regulation in a single voltage regulating coil 100, which is beneficial to reducing the overall volume of the coil and manufacturing complexity.

[0038] In some embodiments, such as Figure 1 and Figure 2As shown, each insulated wire 11 can be arranged radially along the coil body 10, and nine spiral winding regions can be formed by concentric winding, and the nine spiral winding regions can be arranged in a centrally symmetrical manner. Specifically, the nine spiral winding regions can be distributed at predetermined positions along the radial or circumferential direction of the coil body 10, so that the coil body 10 as a whole forms a relatively balanced winding structure, and insulation support structures can be respectively provided between the nine spiral winding regions. The insulation support structures can form insulation heat dissipation channels 20 between adjacent spiral winding regions, so that transformer oil or other insulating cooling media can flow along the axial direction of the coil body 10.

[0039] In the above embodiment, the nine spiral winding regions are arranged in a centrally symmetrical manner, which makes the conductor distribution of the coil body 10 more uniform and reduces the phenomenon of leakage flux concentration caused by conductor offset or uneven winding regions. By improving the leakage flux distribution, additional losses can be reduced and the risk of local overheating can be decreased. At the same time, the centrally symmetrical nine-spiral structure also makes the coil body 10 more uniformly stressed under the action of electromagnetic force, which is beneficial to improving the mechanical strength of the voltage regulating coil 100 against sudden short-circuit impacts and reducing the risk of winding deformation and insulation damage.

[0040] In some embodiments, such as Figure 1 As shown, the helix angle of each spiral winding region is the same. Specifically, when winding the coil body 10, the nine spiral winding regions can be extended axially with the same or basically the same helix angle to ensure that the axial arrangement pitch of each spiral winding region is consistent, thereby making the orientation of each insulated wire 11 in the coil body 10 more consistent, which can further improve the symmetry and stability of the coil structure.

[0041] In the above embodiments, by making each spiral winding region have the same helix angle, the axial electromagnetic force distribution of the coil body 10 can be more balanced, and the leakage flux of the winding can be more uniformly distributed along the axial and radial directions. This not only helps to reduce additional losses, but also reduces the mechanical stress caused by local electromagnetic force concentration, and improves the long-term operational reliability of the voltage regulating coil 100.

[0042] In some embodiments, such as Figure 2As shown, the nine spiral winding regions may include eight first winding regions 30 and one second winding region 40. Each first winding region 30 may contain two insulated wires 11, and each second winding region 40 may contain one insulated wire 11. Therefore, the eight first winding regions 30 contain a total of 16 insulated wires 11, plus the one insulated wire 11 in the second winding region 40, forming a nine-spiral structure with 17 insulated wires 11 wound in parallel. Specifically, during the winding process, each of the eight first winding regions 30 may have two insulated wires 11 arranged radially side-by-side, and the two insulated wires 11 may be of the same specification and wound spirally along the same path. The second winding region 40 may contain one insulated wire 11, and this insulated wire 11 may maintain the same or substantially the same helix angle as the other winding regions.

[0043] In the above embodiment, by “laying two wires in each of the eight regions and one wire in one region”, the 17 insulated wires 11 can be reasonably distributed to the nine spiral winding regions to form a nine-helix structure. This nine-helix structure can take into account both the electrical requirements of the 17 wires being wound in parallel and the mechanical requirements of the nine-helix symmetrical arrangement, so that the coil body 10 can meet the 17-level voltage regulation design while maintaining good structural compactness and regularity of arrangement.

[0044] In some embodiments, such as Figure 2 As shown, the second winding region 40 may be provided with an insulation compensation element 50 to match the radial dimension of the second winding region 40 with the radial dimension of the first winding region 30. Specifically, since the first winding region 30 has two insulated wires 11, while the second winding region 40 has only one insulated wire 11, without compensation, the radial dimension of the second winding region 40 will be smaller than that of the first winding region 30, thus affecting the overall symmetry of the nine spiral winding regions. By providing the insulation compensation element 50 in the second winding region 40, the overall symmetry of the nine spiral winding regions can be ensured. The insulation compensation element 50 may be made of insulating paper, insulating blocks, insulating cardboard, or other insulation compensation materials suitable for transformer coils. The insulation compensation element 50 may be placed in a position within the second winding region 40 that is not occupied by the insulated wires 11 to compensate for the radial dimension of the second winding region 40, making it consistent with or substantially consistent with the radial dimension of the first winding region 30. It should be noted that the insulation compensation component 50 may have electrical and heat resistance properties that match the insulation class of the voltage regulating coil 100, and may maintain a stable shape during coil winding and operation.

[0045] In the above embodiment, by providing an insulation compensation element 50 in the second winding region 40, the problem of uneven local gaps or uneven stress in the coil body 10 caused by the small size of a single conductor region can be avoided. The insulation compensation element 50 can not only maintain the radial dimension consistency of the nine spiral winding regions, but also improve the stability and compactness of the overall winding structure, thereby ensuring the central symmetrical arrangement of the coil body 10.

[0046] In some embodiments, multiple voltage regulating tap positions can be spaced apart along the axial direction of the coil body 10, and the difference in the number of winding turns between adjacent voltage regulating tap positions is equal. Specifically, when there are 17 voltage regulating tap positions, the 17 voltage regulating tap positions can be arranged sequentially along the axial direction of the coil body 10 at predetermined intervals, and led out to the outside of the coil body 10 through tap leads. At the same time, adjacent voltage regulating tap positions can correspond to the same difference in the number of winding turns to form a graded voltage regulation structure, thereby achieving linear voltage regulation.

[0047] In the above embodiments, by making the difference in the number of winding turns between adjacent tap positions equal, the voltage change between each tap position can be made more uniform, which is beneficial to improving the voltage regulation accuracy and output voltage stability. The 17 tap positions may include rated voltage positions, and step-up and step-down positions can be set according to the design requirements of the rectifier transformer. After the tap leads are connected to the corresponding tap positions, they can be connected to the on-load tap changer to perform on-load voltage regulation as needed during transformer operation.

[0048] It should be noted that, in practical applications, insulation distances or insulation structures that meet electrical insulation requirements can be set between each tap position to avoid inter-stage discharge between adjacent positions. The tap leads can be arranged in a regular manner according to the axial position of the coil body 10 and the connection position of the on-load tap changer to avoid lead crossing and confusion, and to reduce the problem of electric field concentration between leads.

[0049] In some embodiments, the insulating support structure may include an inter-turn insulation member 60, an end insulation member 70, and an oil duct insulating pad. The inter-turn insulation member 60 may be disposed between the insulated conductors 11 of adjacent turns, the end insulation member 70 may be disposed at the axial end of the coil body 10, and the oil duct insulating pad may be disposed between adjacent spiral winding areas. Specifically, the inter-turn insulation member 60 may be inter-turn insulating paper, insulating paper tape, or other insulating members suitable for inter-turn insulation of conductors, and the inter-turn insulation member 60 may cover or be disposed between the insulated conductors 11 of adjacent turns to improve the insulation performance between adjacent conductor turns. The end insulation member 70 may be an end insulating ring, end insulating pressure plate, or other end insulating support member, and may be disposed at the upper and / or lower end of the coil body 10 to provide end support and insulating isolation for the coil body 10. The oil duct insulating pad may be disposed between adjacent spiral winding areas to maintain the interval between adjacent spiral winding areas and form an insulating heat dissipation channel 20.

[0050] In the above embodiments, the inter-turn insulation component 60 ensures the insulation reliability between adjacent turns, the end insulation component 70 improves the mechanical support and insulation protection capabilities of the coil body 10 ends, and the oil channel insulation pad simultaneously achieves mechanical spacing, insulation isolation, and heat dissipation channel formation between winding areas. Through the above structural combination, the insulation stability and mechanical stability of the voltage regulating coil 100 during long-term operation can be improved.

[0051] In some embodiments, the oil duct insulating pads can form an insulating heat dissipation channel 20 extending axially along the coil body 10 between adjacent spiral winding regions. Specifically, the oil duct insulating pads can be spaced apart or continuously arranged along the axial direction of the coil body 10 to support adjacent spiral winding regions and maintain a predetermined spacing. The space between adjacent oil duct insulating pads or defined by the oil duct insulating pads can form a channel for the flow of insulating oil, and the insulating heat dissipation channel 20 can extend axially along the coil body 10, allowing the insulating oil to flow from one end of the coil body 10 to the other, carrying away the heat generated during coil operation.

[0052] In the above embodiments, the insulating heat dissipation channel 20 not only increases the insulation distance between adjacent spiral winding areas but also improves the heat dissipation conditions inside the coil body 10. For high-power rectifier transformers, the voltage regulating coil 100 carries a large current during operation, and insufficient heat dissipation can easily lead to excessive local temperature rise. By setting an axially continuous insulating heat dissipation channel 20, heat transfer and insulating oil circulation can be accelerated, reducing the risk of local overheating, thereby improving the operational reliability and service life of the voltage regulating coil 100.

[0053] In some embodiments, the coil body 10 of the voltage regulating coil 100 can be formed in the following manner: First, 17 rectangular insulated wires 11 of the same specification are prepared, ensuring that the length, wire diameter, and insulation thickness of each insulated wire 11 meet the design requirements; then, the 17 insulated wires 11 are distributed to nine spiral winding areas according to a predetermined radial arrangement, wherein each of the eight first winding areas 30 has two insulated wires 11, and each of the two second winding areas 40 has one insulated wire 11; then, insulation compensation is provided in the second winding area 40. The radial dimension of the second winding region 40 is matched with that of the first winding region 30. Then, each winding region is concentrically wound with the same helix angle, and oil channel insulating pads are arranged between adjacent helical winding regions to form an insulating heat dissipation channel 20. At the same time, inter-turn insulating parts 60 are set between adjacent turns, and end insulating parts 70 are set at the axial end of the coil body 10. Finally, tap leads are set according to the positions of the 17 voltage regulating tap positions, and the tap leads are neatly led out to the outside of the coil body 10.

[0054] In the above-mentioned formation method, the parallel winding of 17 insulated wires 11 can meet the voltage regulation requirements of fewer turns and more levels; the nine spiral winding areas can improve the symmetry of the wire arrangement; the insulation compensation component 50 can ensure that the radial dimensions of the single wire area and the double wire area are consistent; the insulation heat dissipation channel 20 can improve the heat dissipation capacity; and the 17 voltage regulation tap positions can realize continuous multi-level voltage regulation.

[0055] In some embodiments, the 17 tap positions can be arranged sequentially along the axial direction of the coil body 10 according to the position sequence, and each tap position can be connected to its corresponding tap lead. The tap leads can be led out from the outside of the coil body 10 along a predetermined path and connected to the on-load tap changer of the transformer. Furthermore, the arrangement of the tap leads can follow the principles of short path, minimal crossing, easy fixing, and convenient insulation isolation to improve the reliability of the lead connection and the ease of assembly. Specifically, the tap leads can be led out in layers or groups along the outside of the coil body 10 and fixed by insulating bindings, insulating supports, or clamps to prevent displacement of the tap leads due to electromagnetic force or vibration during transformer operation. Insulating gaps or insulating partitions can be provided between adjacent tap leads to ensure sufficient electrical insulation distance between leads at different potentials. After the tap leads are led out, they can be arranged according to the terminal positions of the on-load tap changer to facilitate connection.

[0056] In the above embodiment, the tap lead is connected to 17 voltage regulating tap positions, allowing the on-load tap changer to select different tap positions according to operational requirements, thereby changing the effective number of winding turns in the connected circuit and regulating the output voltage. Simultaneously, since the difference in the number of winding turns between adjacent voltage regulating tap positions is equal, the voltage change corresponding to each tap position is relatively uniform, thus achieving linear and stable voltage regulation.

[0057] The voltage regulating coil 100 disclosed in this application embodiment achieves 17 levels of voltage regulation through 17 voltage regulating tap positions. It is formed by winding 17 insulated wires 11 in parallel to form a single voltage regulating coil structure, enabling multi-level voltage regulation without adding complex voltage regulating windings, thus reducing coil size and manufacturing costs. The centrally symmetrical arrangement of the nine spiral winding regions and the identical spiral helix angle design improve the radial and axial distribution balance of the wires, reducing leakage flux concentration and additional losses. Furthermore, the nine-helix structure makes the overall force distribution of the coil body 10 more balanced. Combined with the support of the inter-turn insulation 60, end insulation 70, and oil channel insulation pad, it enhances the coil body 10's resistance to sudden short-circuit impacts. Simultaneously, an insulating heat dissipation channel 20 is formed between adjacent spiral winding regions, and this channel 20 can be axially continuous, allowing the insulating oil to circulate and dissipate heat, thereby reducing the risk of localized overheating. In addition, the voltage regulating coil 100 is still based on the multi-wire parallel winding and spiral coil winding process, exhibiting good compatibility with traditional spiral coil manufacturing processes, facilitating production, processing, and assembly.

[0058] It should be noted that, in this application, the number of insulated wires 11, the number of voltage regulating tap positions, and the number of spiral winding areas can be adjusted according to the specific transformer design requirements; however, in the preferred embodiment, there are 17 insulated wires 11, 17 voltage regulating tap positions, and nine spiral winding areas, to form a nine-spiral 17-stage voltage regulating coil structure suitable for on-load voltage regulation of special rectifier transformers.

[0059] This application also discloses a rectifier transformer, which may include an on-load tap changer and a voltage regulating coil 100 as disclosed in the above embodiments. Therefore, it possesses all the technical effects of the voltage regulating coil 100, which will not be repeated here. The tap lead can be connected to the on-load tap changer, and the rectifier transformer can be a high-power rectifier transformer or a special rectifier transformer to adapt to scenarios requiring DC power supply and voltage regulation, such as metallurgy, electrolysis, chemical industry, or electric drive.

[0060] In the above embodiment, the on-load tap changer can switch different tap positions of the regulating coil 100 during transformer operation to achieve on-load voltage regulation. Simultaneously, since the regulating coil 100 has 17 tap positions, the rectifier transformer can achieve 17 levels of voltage regulation. Through these 17 levels of regulation, the output voltage can be finely adjusted when the grid voltage fluctuates or the load conditions change, thereby improving the voltage adaptability and output stability of the rectifier transformer.

[0061] In some embodiments, when the rectifier transformer needs to adjust the output voltage, the on-load tap changer switches to the corresponding voltage regulating tap position according to the control command. Different voltage regulating tap positions correspond to different effective winding turns in the coil body 10. By changing the number of winding turns connected to the circuit, the output voltage is increased or decreased. Since the 17 voltage regulating tap positions are arranged along the axial direction of the coil body 10, and the difference in the number of winding turns between adjacent positions is equal, the rectifier transformer can achieve uniform differential voltage regulation. During the operation of the coil body 10, the 17 insulated wires 11 are connected in parallel to carry the current. The uniform specifications of each insulated wire 11 facilitate the uniform distribution of current. The centrally symmetrical arrangement of the nine spiral winding regions makes the leakage flux distribution more balanced, reducing local leakage flux concentration and additional losses. The insulating heat dissipation channel 20 between adjacent spiral winding regions can provide flow space for the insulating oil, allowing the heat generated during operation to dissipate in a timely manner. The end insulation component 70 and the inter-turn insulation component 60 provide insulation protection and mechanical support for the ends and inter-turns of the coil body 10, respectively, so that the voltage regulating coil 100 can meet the multi-level voltage regulation requirements while having good heat dissipation performance, insulation performance and short-circuit mechanical strength.

[0062] The terminology used in the above embodiments is for the purpose of describing specific embodiments only and is not intended to be limiting of this application. As used in the specification and appended claims of this application, the singular expressions "a," "an," "the," "the," "the," and "this" are intended to also include expressions such as "one or more," unless the context clearly indicates otherwise. It should also be understood that in the embodiments of this application, "one or more" refers to one, two, or more; "and / or" describes the relationship between related objects, indicating that three relationships may exist; for example, A and / or B can represent: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship.

[0063] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0064] The "multiple" mentioned in the embodiments of this application refers to two or more. It should be noted that in the description of the embodiments of this application, terms such as "first" and "second" are used only for the purpose of distinguishing descriptions and should not be construed as indicating or implying relative importance, nor should they be construed as indicating or implying order.

[0065] The terms "parallel" and "perpendicular" used in this application refer to "basically parallel" and "basically perpendicular" in practical operation. "Basically parallel" can be understood as parallelism with a certain degree of error, and similarly, "basically perpendicular" can be understood as perpendicularity with a certain degree of error.

[0066] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A voltage regulating coil, characterized by, include: The coil body (10) is formed by multiple insulated wires (11) connected in parallel and concentrically wound. The coil body (10) is provided with multiple voltage adjustment tap positions along the axial direction. Each of the insulated wires (11) is arranged radially along the coil body (10) and forms multiple spiral winding areas. The tap leads are connected to each of the voltage regulating tap positions and led out to the outside of the coil body (10); An insulating support structure is provided on the coil body (10) and forms an insulating heat dissipation channel (20) between adjacent spiral winding areas.

2. The voltage regulating coil according to claim 1, characterized in that, The number of insulated wires (11) is 17, and each of the insulated wires (11) has the same specification, and the number of voltage regulating tap positions is 17.

3. The voltage regulating coil according to claim 1, characterized in that, The spiral winding region comprises nine regions, and these nine spiral winding regions are arranged in a centrally symmetrical manner.

4. The voltage regulating coil according to claim 3, characterized in that, The helix angle of each of the spiral winding regions is the same.

5. The voltage regulating coil according to claim 3, characterized in that, The spiral winding area includes eight first winding areas (30) and one second winding area (40). The first winding area (30) is provided with two insulated wires (11), and the second winding area (40) is provided with one insulated wire (11).

6. The voltage regulating coil according to claim 5, characterized in that, The second winding region (40) is provided with an insulation compensation member (50) so that the radial dimension of the second winding region (40) matches the radial dimension of the first winding region (30).

7. The voltage regulating coil according to claim 1, characterized in that, Each of the voltage regulating tap positions is spaced apart along the axial direction of the coil body (10), and the difference in the number of winding turns between adjacent voltage regulating tap positions is equal.

8. The voltage regulating coil according to claim 1, characterized in that, The insulating support structure includes an inter-turn insulation component (60), an end insulation component (70), and an oil channel insulation pad. The inter-turn insulation component (60) is disposed between the insulated conductors (11) of adjacent turns. The end insulation component (70) is disposed at the axial end of the coil body (10). The oil channel insulation pad is disposed between adjacent spiral winding areas.

9. The voltage regulating coil according to claim 8, characterized in that, The oil channel insulating pad forms an insulating heat dissipation channel (20) that runs through the axial direction of the coil body (10) between adjacent spiral winding areas.

10. A rectifier transformer, characterized in that, It includes an on-load tap changer and a voltage regulating coil (100) as claimed in any one of claims 1 to 9, wherein the tap lead is connected to the on-load tap changer.

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