Anti-short-circuit amorphous alloy transformer and manufacturing method thereof

Abstract

The application provides an anti-short-circuit amorphous alloy transformer and a manufacturing method thereof, and relates to the technical field of power distribution system equipment manufacturing. The anti-short-circuit amorphous alloy transformer comprises a shell, an amorphous alloy core, an insulating cylinder, a low-voltage winding and a high-voltage winding arranged in the shell. The insulating cylinder is sleeved on the outer periphery of the amorphous alloy core, the low-voltage winding is wound on the outer periphery of the insulating cylinder, the high-voltage winding is wound on the outer periphery of the low-voltage winding, and a heat dissipation oil channel is arranged between the high-voltage winding and the low-voltage winding. A plurality of insulating supporting members are arranged at both ends of the transformer. Each insulating supporting member comprises a clamping portion, an extruding portion and a limiting portion. The clamping portion is detachably connected to the insulating cylinder, the extruding portion is connected to the clamping portion, and the limiting portion is arranged on the extruding portion and inserted into the heat dissipation oil channel. The application can effectively inhibit the axial and radial deformation of the winding of the transformer during operation or short circuit. The application is not only convenient to disassemble and assemble, but also can maintain the structural stability of the heat dissipation oil channel, thereby improving the thermal stability and short-circuit resistance of the transformer.

Description

Technical Field

[0001] This invention relates to the field of power distribution system equipment manufacturing technology, and in particular to a short-circuit resistant amorphous alloy transformer and its manufacturing method. Background Technology

[0002] Currently, transformers play a crucial role in power distribution systems, with their main functions including voltage transformation, current transformation, impedance transformation, and safety isolation. Operating on the principle of electromagnetic induction, transformers convert electrical energy from one voltage level to another, meeting the voltage requirements of different electrical devices. During power transmission, transformers are used for high-voltage transmission to reduce line losses, while at the user end, they convert high-voltage energy into low-voltage energy, ensuring the safety and convenience of electricity use in homes and businesses. In the manufacturing process of existing short-circuit resistant oil-immersed transformers, to prevent deformation of the transformer windings when a short circuit occurs, the industry commonly employs methods such as brushing resin between winding layers or impregnating the entire winding with insulating varnish to improve the axial and radial mechanical strength and structural stability of the windings. However, while these traditional methods strengthen the winding structure to some extent, they do not fundamentally address the source of short-circuit electrodynamic forces and cannot eliminate the potential deformation of the windings under short-circuit impacts. In response, a technical solution disclosed in Chinese patent application CN108806924A proposes a short-circuit resistant amorphous alloy transformer and its manufacturing method. By introducing insulating straps between the high and low voltage windings and setting laminated support bars, the structural design enhances the winding's support force and overall stability, effectively solving the quality problems existing in the production process of traditional short-circuit resistant oil-immersed transformers and improving the transformer's mechanical strength and resistance to sudden short-circuit impacts.

[0003] However, through research on the aforementioned patented solutions, the applicant discovered that while these solutions represent a certain level of technological advancement, they still have significant shortcomings in practical applications. On one hand, the solution requires embedding insulating strips into the winding structure and performing binding operations, making the entire process cumbersome and complex. This not only significantly reduces manufacturing efficiency but also increases assembly costs. On the other hand, embedding the insulating strips may damage the structural integrity of the winding itself or adversely affect electrical performance, thereby reducing the reliability and stability of the transformer during operation. Therefore, current existing technologies have not yet simultaneously improved short-circuit withstand capability while ensuring both manufacturing simplicity and electrical performance. Thus, a new structural design and manufacturing solution is urgently needed to fundamentally overcome the aforementioned technical problems and achieve a harmonious balance between short-circuit withstand capability, electrical performance, and manufacturing efficiency. Summary of the Invention

[0004] This application discloses a short-circuit resistant amorphous alloy transformer and its manufacturing method to solve the technical problems existing in related technologies.

[0005] In a first aspect, this application provides a short-circuit resistant amorphous alloy transformer, including a housing and a high-voltage winding, a low-voltage winding, an insulating cylinder, and an amorphous alloy core disposed within the housing. The insulating cylinder is sleeved around the outer periphery of the amorphous alloy core, the low-voltage winding is wound around the outer periphery of the insulating cylinder, the high-voltage winding is wound around the outer periphery of the low-voltage winding, and a heat dissipation oil channel is reserved between the high-voltage winding and the low-voltage winding. It also includes insulating supports, which are provided at both ends of the insulating cylinder. Each insulating support has a snap-fit ​​portion, a compression portion, and a limiting portion. The compression portion is located on the first snap-fit ​​portion and fits against the end walls of the high-voltage winding and the low-voltage winding. The snap-fit ​​part is detachably connected to the insulating cylinder; The pressing part is provided on the snap-fit ​​part and is used to limit the axial displacement of the high-voltage winding and the low-voltage winding; The limiting part is provided on the extrusion part and inserted into the heat dissipation oil channel to limit the radial displacement of the high voltage winding and the low voltage winding.

[0006] Preferably, the snap-fit ​​portion includes a first snap-fit ​​sub-portion and a second snap-fit ​​portion, the first snap-fit ​​sub-portion and the second snap-fit ​​portion are integrally connected and configured to bend into a V-shape relative to each other after elastic deformation. The end wall of the insulating cylinder is axially provided with a snap-fit ​​groove for the snap-fit ​​portion to engage. When the transformer is not in operation, after the snap-fit ​​part snaps into the snap-fit ​​groove, the abutting force exerted by the second snap-fit ​​part on the inner wall of the snap-fit ​​groove is N1. When the transformer is in operation or short-circuited, after the snap-fit ​​part snaps into the snap-fit ​​groove, the abutting force exerted by the second snap-fit ​​part on the inner wall of the snap-fit ​​groove is N2. The N2 > N1.

[0007] Preferably, the snap-fit ​​portion is made of a shape memory alloy material, allowing it to undergo elastic deformation or recovery deformation at temperatures above or below the abnormal temperature; wherein, When the transformer is not in operation, the temperature inside the snap-fit ​​groove is lower than the abnormal temperature, and the first snap-fit ​​part and the second snap-fit ​​part remain in a V-shaped state. When the transformer is in operation or short-circuited, the temperature inside the snap-fit ​​groove is higher than the abnormal temperature. The first snap-fit ​​part and the second snap-fit ​​part tend to deform into a straight line. At the same time, the second snap-fit ​​part actively applies additional abutment force to the inner wall of the snap-fit ​​groove so that N2 > N1.

[0008] Preferably, the inner bottom wall of the snap-fit ​​groove is provided with a heat collection sub-groove. After the V-shaped first snap-fit ​​part and the second snap-fit ​​part are snapped into the snap-fit ​​groove, the bent parts of the first snap-fit ​​part and the second snap-fit ​​part are located in the heat collection sub-groove. A heat-conducting channel is provided inside the insulating cylinder. One end of the heat-conducting channel is open and connected to the heat-collecting sub-slot, and the other end is open and faces the low-voltage winding side. A first copper sheet is embedded in the heat-conducting channel. One end of the first copper sheet passes through the heat-conducting channel and is bent and simultaneously attached to the outer wall of the insulating cylinder and the inner wall of the low-voltage winding. The other end is bent and attached to the inner wall of the heat-collecting sub-slot.

[0009] Preferably, the extrusion section includes a first extrusion sub-section and a second extrusion sub-section integrally connected, wherein the first extrusion sub-section and the second extrusion sub-section are bent relative to each other. The end of the first extrusion part away from the second extrusion part is connected to the first snap-fit ​​part, and the angle formed by the first extrusion part and the second extrusion part is an obtuse angle; The second extrusion part is simultaneously flat against the end faces of the high-voltage winding and the low-voltage winding.

[0010] Preferably, the extrusion section is made of a shape memory alloy material to undergo elastic deformation or recovery deformation at temperatures above or below the abnormal temperature; wherein, When the transformer is not in operation, the temperature of the connection between the first extrusion sub-section and the second extrusion sub-section is lower than the abnormal temperature, and the first extrusion sub-section and the second extrusion sub-section remain in a relatively bent state. When the transformer is in operation or short-circuited, the temperature at the connection point of the first extrusion sub-section and the second extrusion sub-section is higher than the abnormal temperature. The first extrusion sub-section and the second extrusion sub-section tend to deform into a straight state, while driving the second extrusion sub-section to actively apply axial thrust to the end faces of the high-voltage winding and the low-voltage winding.

[0011] Preferably, the surfaces of the first snap-fit ​​portion, the second snap-fit ​​portion, the first extrusion portion, and the second extrusion portion are all covered with an insulating rubber layer.

[0012] Preferably, the insulating rubber layer has a notch at the connection point of the first and second snap-fit ​​parts, and a second copper sheet is bonded to the notch. Part of the second copper sheet has its side surface facing away from the connection point of the first and second snap-fit ​​parts in contact with the end wall of the low-voltage winding.

[0013] Preferably, the limiting portion includes a first limiting sub-portion and a second limiting sub-portion, wherein, The first limiting sub-part is vertically connected to the second extrusion sub-part, and the first limiting sub-part is in contact with the inner sidewall of one side of the heat dissipation oil channel; The second limiting sub-part is vertically connected to the second extrusion sub-part and is spaced apart from the first limiting sub-part. The second limiting sub-part is in contact with the inner wall of the other side of the heat dissipation oil channel.

[0014] Secondly, this application provides a method for manufacturing a short-circuit resistant amorphous alloy transformer, used to produce the short-circuit resistant amorphous alloy transformer described in the first aspect, comprising the following steps: The non-alloy iron core is installed at the center of the shell, and the insulating sleeve is placed on the outer periphery of the amorphous alloy iron core. A low-voltage winding is wound around the outer peripheral wall of the insulating cylinder; The first annular insulating plate is attached to the outer periphery of the low-voltage winding, and then the second annular insulating plate is fitted around the outer periphery of the first annular insulating plate. A spacer strip is connected between the first annular insulating plate and the second annular insulating plate to maintain the distance between the first annular insulating plate and the second annular insulating plate, forming a heat dissipation oil channel. A high-voltage winding is wound around the outer periphery of the second annular insulating plate; The snap-fit ​​part is snapped onto the insulating cylinder, and the compression part is attached to the end walls of the high-voltage winding and the low-voltage winding. At the same time, the limiting part is inserted into the cooling oil channel.

[0015] In summary, this application includes at least one of the following beneficial technical effects: In the short-circuit resistant amorphous alloy transformer of this application, multiple insulating support members with snap-fit, compression, and limiting parts are respectively set at both ends of the insulating cylinder. This introduces a composite structure that provides multi-dimensional support and constraint against the axial and radial deformation that may occur in the high-voltage and low-voltage windings under operating and short-circuit conditions. The snap-fit ​​parts detachably connect the insulating support members to the insulating cylinder, providing flexibility during installation and maintenance, facilitating positioning and adjustment, and making installation more convenient. Simultaneously, the compression parts fit snugly against the winding end faces, providing axial support to the high-voltage and low-voltage windings during temperature rises or short-circuit impacts, which helps to mitigate the risk of axial deformation caused by short-circuit electrodynamic forces. The limiting parts are inserted into the cooling oil channels and fit snugly against the inner wall of the channels, restraining the tendency of the high-voltage and low-voltage windings to approach each other, maintaining the spacing between the windings to a certain extent. This helps to prevent excessive compression of the hot oil channel space, promotes the stability of the oil channel morphology, and makes the heat dissipation path smoother, which is beneficial to maintaining the thermal stability and reliability of the transformer during long-term operation. This technical solution comprehensively considers structural strength, electrical insulation performance, and thermal response factors, and has positive significance for improving the structural stability and operational safety of amorphous alloy transformers under extreme conditions such as short circuits. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a structural schematic diagram of an embodiment of this application; Figure 2 yes Figure 1 A partial sectional view of AA in the diagram; Figure 3 yes Figure 2 Enlarged view of part A in the image.

[0018] The diagram is marked as follows: 1. Shell; 11. Heat dissipation oil channel; 111. First annular insulating plate; 112. Second annular insulating plate; 2. High voltage winding; 3. Low voltage winding; 4. Insulating cylinder; 41. Snap-fit ​​groove; 42. Heat collection groove; 43. Heat conduction channel; 431. First copper sheet; 5. Amorphous alloy iron core; 6. Insulating support; 7. Snap-fit ​​part; 71. First snap-fit ​​part; 72. Second snap-fit ​​part; 8. Extrusion part; 81. First extrusion part; 82. Second extrusion part; 9. Limiting part; 91. First limiting part; 92. Second limiting part; 10. Insulating rubber layer; 101. Second copper sheet. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0020] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0021] Firstly, some embodiments of this application provide a short-circuit resistant amorphous alloy transformer, such as... Figure 1 , Figure 2 and Figure 3 As shown, the device includes a housing 1 and a high-voltage winding 2, a low-voltage winding 3, an insulating cylinder 4, and an amorphous alloy core 5 installed inside the housing 1. The insulating cylinder 4 is sleeved on the outer periphery of the amorphous alloy core 5, the low-voltage winding 3 is wound on the outer periphery of the insulating cylinder 4, and the high-voltage winding 2 is wound on the outer periphery of the low-voltage winding 3. A heat dissipation oil channel 11 for the flow of insulating oil is provided between the high-voltage winding 2 and the low-voltage winding 3.

[0022] It is understood that the short-circuit resistant amorphous alloy transformer also includes multiple insulating support components 6. The insulating support components 6 are respectively arranged at the upper and lower ends of the insulating cylinder 4. Each group includes at least two or more, which are evenly distributed in the axial direction. The insulating support components 6 used as a whole include three main structural areas: a snap-fit ​​part 7, a pressing part 8, and a limiting part 9.

[0023] For example, the snap-fit ​​part 7 is configured to connect with the insulating cylinder 4 in a detachable manner, which avoids damage to the structure of the insulating cylinder 4 and provides a certain degree of flexibility during maintenance or replacement, thereby improving maintenance efficiency.

[0024] For example, the pressing part 8 is provided on the snap-fit ​​part 7, so that it has a limiting effect between the axial end faces of the high voltage winding 2 and the low voltage winding 3, which helps to reduce the risk of relative displacement of the high voltage winding 2 and the low voltage winding 3 in the axial direction under the action of short-circuit electrodynamic impact.

[0025] For example, the limiting part 9 extends from the extrusion part 8 and is inserted axially into the pre-reserved heat dissipation oil channel 11 between the high-voltage winding 2 and the low-voltage winding 3. During installation, it does not directly contact the high-voltage winding 2 or the low-voltage winding 3, thereby reducing interference with the winding structure to a certain extent. The limiting part 9, through its radial support, restricts the tendency of the winding to undergo radial displacement when subjected to short-circuit electromagnetic force. Furthermore, the size of the limiting part 9 is designed to be smaller than the width of the heat dissipation oil channel 11. While achieving the radial limiting function, it does not significantly compress the width of the oil channel, which is beneficial for maintaining stable heat dissipation during transformer operation.

[0026] With the above structure, both the high-voltage winding 2 and the low-voltage winding 3 can be effectively supported in both axial and radial directions, improving the stability of the entire winding structure under short-circuit conditions. Since the insulating support 6 does not need to be inserted into or embedded in the winding, and complex binding operations are unnecessary, manufacturing efficiency is improved and the process is simplified. It also helps maintain the structural integrity and electrical performance stability of the winding. In the long-term operating environment of the transformer, the insulating support 6, through its composite structure, provides beneficial fixation and protection, demonstrating significant engineering application value.

[0027] In some embodiments, combined with Figure 1 , Figure 2 and Figure 3 The snap-fit ​​part 7 is integrally connected by the first snap-fit ​​part 71 and the second snap-fit ​​part 72. When not subjected to external force, the two parts form a V-shaped structure and can undergo a certain degree of elastic deformation during insertion. The connection end of the V-shaped structure, that is, the junction of the first snap-fit ​​part 71 and the second snap-fit ​​part 72, serves as the insertion tip, which is inserted into the snap-fit ​​groove 41 at the end of the insulating cylinder 4.

[0028] Furthermore, the end wall of the insulating cylinder 4 is provided with a snap-fit ​​groove 41 along the axial direction to accommodate the insertion of the snap-fit ​​part 7. Specifically, the width of the snap-fit ​​groove 41 is smaller than the overall width of the snap-fit ​​part 7 in its V-shaped state. Thus, during insertion, the V-shaped structure is constrained by the inner wall of the snap-fit ​​groove 41, causing the angle between the first snap-fit ​​part 71 and the second snap-fit ​​part 72 to decrease, and the tip portion to move closer and contract to a certain extent. This deformation process allows the V-shaped structure to store elastic potential energy. When the snap-fit ​​part 7 is fully embedded in the snap-fit ​​groove 41, the second snap-fit ​​part 72 expands outward under the action of elastic recovery tendency and applies an initial abutment force of N1 to the inner wall of the snap-fit ​​groove 41. This initial abutment force can, to a certain extent, limit the loosening of the insulating support 6 in the absence of external load or disturbance, helping to maintain its stability in the initial installation stage.

[0029] Meanwhile, after the transformer is put into operation, the high-voltage winding 2 and the low-voltage winding 3 may experience load fluctuations and temperature rises. At this time, the clamping state of the locking slot 41 changes, triggering a further release of the elastic deformation of the V-shaped structure. During this process, the abutment force applied by the second locking part 72 to the inner wall of the locking slot 41 increases from N1 to N2, and N2 is greater than N1. The larger abutment force N2 can improve the fixing stability of the locking part 7 to a certain extent under high temperature or mechanical impact environment, thereby providing a continuous axial limiting effect on the insulating support 6, which is beneficial to resisting the axial displacement of the winding caused by short circuit.

[0030] It is understandable that, since the extrusion part 8 is tightly attached to the axial end faces of the high-voltage winding 2 and the low-voltage winding 3, if the snap-fit ​​part 7 is stable, the extrusion part 8 is less likely to undergo relative displacement under short-circuit impact, which helps maintain the axial stability of the windings and further enhances the structural support capacity of the entire transformer under short-circuit conditions. Simultaneously, this V-shaped structure only requires insertion into the snap-fit ​​slot 41 without complex binding or bonding operations, making installation and disassembly relatively simple, and offering good repeatability and ease of maintenance. Furthermore, the included angle between the first snap-fit ​​part 71 and the second snap-fit ​​part 72 is related to the elastic modulus of its material; specific structural parameters can be adjusted according to actual needs to meet clamping requirements and thermal deformation adaptability under different application scenarios. This structural solution provides mechanical support for the windings while also considering installation efficiency and reliability, making it suitable for amorphous alloy transformer devices with high requirements for resistance to short-circuit impact.

[0031] In some implementations, combined with Figure 1 , Figure 2 and Figure 3 The snap-fit ​​part 7 is made of a shape memory alloy material with thermally induced phase change characteristics. This shape memory alloy material has the ability to undergo reversible deformation under specific temperature conditions. The snap-fit ​​part 7 is integrally formed by a first snap-fit ​​part 71 and a second snap-fit ​​part 72. The two are in a preset V-shaped structure in an environment below the material's transformation temperature. This V-shaped structure is a stable form at room temperature. When the transformer is not running, since the temperature around the snap-fit ​​groove 41 is lower than the material's transformation temperature, the snap-fit ​​part 7 remains in the V-shaped state. After being inserted into the snap-fit ​​groove 41, the elastic deformation between the first snap-fit ​​part 71 and the second snap-fit ​​part 72 causes the second snap-fit ​​part 72 to generate an initial abutment force N1 against the inner wall of the snap-fit ​​groove 41.

[0032] When the transformer starts operating or a short circuit occurs, the heat generated during operation causes the temperature around the locking groove 41 to rise above the transformation temperature of the shape memory alloy material. The locking portion 7 undergoes a phase change, transforming from a V-shaped structure to a straight shape. Specifically, the angle between the first locking portion 71 and the second locking portion 72 gradually increases, approaching 180°. This deformation trend causes the second locking portion 72 to actively expand towards the inner wall of the locking groove 41, further enhancing its contact with the inner wall of the locking groove 41. The contact force in this state is denoted as N2. Because the deformation tends to expand in a straight direction and is thermally driven, the value of N2 in this process is significantly greater than N1 in the initial state. This larger contact force helps maintain the stable installation state of the locking portion 7 during transformer operation, reducing the probability of loosening under thermal expansion or short-circuit impact.

[0033] At the same time, the pressing part 8 is connected to the snap-fit ​​part 7 and closely adheres to the end faces of the high-voltage winding 2 and the low-voltage winding 3. As the contact force of the snap-fit ​​part 7 increases, the axial support of the pressing part 8 increases synchronously, which is more conducive to resisting the displacement trend of the transformer winding in the axial direction during short-circuit impact.

[0034] It should be noted that the thermocution temperature of the shape memory alloy material should be set within a range higher than room temperature but lower than the normal operating temperature of the transformer. This ensures that the snap-fit ​​part 7 maintains the stability of its installation form at room temperature and can undergo effective deformation response under operating or abnormal conditions. For example, a nickel-titanium alloy can be used, with a thermocution temperature generally between 60°C and 100°C. Of course, other shape memory alloy materials can also be used, and the specific choice depends on the actual operating conditions of the transformer. Therefore, through the thermal memory characteristics of this material, the active reinforcement of the supporting structure's resistance force can be achieved without relying on external power or complex mechanical structures, which is beneficial to improving the structural stability of short-circuit resistant amorphous alloy transformers in high-temperature and stress environments.

[0035] At the same time, it should be noted that Figure 2 and Figure 3 This is only to illustrate the state in which the V-shaped first snap-fit ​​part 71 and the second snap-fit ​​part 72 are snapped into the snap-fit ​​groove 41, and does not mean that they are actually snapped in the same way as shown in the figure. It is understandable that during the actual snap-fit ​​process, the first snap-fit ​​part 71 and the second snap-fit ​​part 72 can be more tightly snapped into the snap-fit ​​groove 41 after forming a V-shape, that is, the included angle of the V-shape can be smaller, for example, 1° to 10°. In this way, the first snap-fit ​​part 71 and the second snap-fit ​​part 72 tend to fit together after forming a V-shape. In this way, the first snap-fit ​​part 71 can also fit against the other side wall of the snap-fit ​​groove 41, making the clamping effect better and less likely to fall off. For example, the first snap-fit ​​part 71 can be inserted into the snap-fit ​​groove 41 in a near-vertical state (not shown in the figure), so that the part of the first snap-fit ​​part 71 extending into the snap-fit ​​groove 41 is completely fitted against the inner side wall of the snap-fit ​​groove 41, while the second snap-fit ​​part 72 also abuts against the other inner side wall of the snap-fit ​​groove 41, which also makes the clamping effect better.

[0036] It should be understood that the specific clamping state of the snap-fit ​​part 7 within the snap-fit ​​groove 41 can be adaptively adjusted according to the working conditions, with the aim of ensuring that the snap-fit ​​part 7 can be firmly clamped within the snap-fit ​​groove 41. Simultaneously, to further prevent detachment, anti-slip textures can be machined on the inner wall of the snap-fit ​​groove 41, making it less likely for the second snap-fit ​​part 72 and / or the first snap-fit ​​part 71 to detach after being adhered to the inner wall of the snap-fit ​​groove 41 due to the influence of the anti-slip textures.

[0037] In some implementations, combined with Figure 1 , Figure 2 and Figure 3To more effectively induce the desired morphological change in the snap-fit ​​portion 7 made of shape memory alloy material under transformer operation or short-circuit conditions, a structure for concentrating heat is provided to improve the response efficiency of the snap-fit ​​portion 7 to temperature changes. A snap-fit ​​groove 41 is provided on the end wall of the insulating cylinder 4, and a heat-collecting sub-groove 42 is provided on the inner bottom wall of the snap-fit ​​groove 41. When the first snap-fit ​​portion 71 and the second snap-fit ​​portion 72 are inserted into the snap-fit ​​groove 41 in a V-shape, their bent connection position is located within the heat-collecting sub-groove 42. Since the deformation of the shape memory alloy material is mainly concentrated in the bent connection area, it is necessary to concentrate the heat to this part as much as possible, thereby making it more conducive to the linear deformation behavior of this area at high temperatures. To enhance the thermal induction capability of this part, a heat-conducting channel 43 is also provided inside the insulating cylinder 4. One end of the heat-conducting channel 43 is open to communicate with the heat-collecting sub-groove 42, and the other end is open towards the low-voltage winding 3. A first copper sheet 431 is embedded inside the heat conduction channel 43. One end of the copper sheet passes through the heat conduction channel 43 and is bent so that it is simultaneously attached to the outer wall of the insulating cylinder 4 and the inner wall of the low voltage winding 3. The other end is bent and attached to the inner wall of the heat collection slot 42.

[0038] It is understandable that the first copper sheet 431, as a material with high thermal conductivity, can quickly conduct heat along the heat conduction channel 43 to the heat collector slot 42 when the low-voltage winding 3 is heated, thereby causing the temperature inside the heat collector slot 42 to rise in a short time. The bent parts of the V-shaped first snap-fit ​​portion 71 and the second snap-fit ​​portion 72 in the heat collector slot 42 can fully contact the local heat collection area, thereby quickly receiving the heat generated from the operation inside the transformer, and thus causing it to change its structure according to the preset material memory path, so that the originally V-shaped snap-fit ​​portion 7 gradually approaches a straight structure. This structural change will cause the second snap-fit ​​portion 72 to have a stronger abutment against the inner wall of the snap-fit ​​slot 41, thereby forming a greater abutment force under the temperature rise environment, which is conducive to improving the overall structural stability of the snap-fit ​​portion 7 in the installation position; at the same time, the bent parts at both ends of the first copper sheet 431 are conducive to improving the installation stability of the first copper sheet 431 in the heat conduction channel 43, which can effectively prevent the first copper sheet 431 from falling out of the heat conduction channel 43.

[0039] Meanwhile, because the first copper sheet 431 is attached to the inner wall of the low-voltage winding 3 and the outer wall of the insulating cylinder 4, heat can be efficiently conducted from the heat source side to the vicinity of the bending part of the snap-fit ​​7. This allows for a rapid closed-loop heat conduction path, ensuring a high heat response rate while avoiding excessive local heat loss and increasing the concentration of the thermal effect. Structurally, this assists the shape memory alloy material in accurately responding to temperature rise changes. This structural design makes it easier for the transformer to trigger the internal strain mechanism under actual operation or abnormal temperature rise conditions, thereby resisting axial deformation under short-circuit impact.

[0040] In some implementations, combined with Figure 1 , Figure 2 and Figure 3 The extrusion section 8 is designed to facilitate the axial positioning and fastening of the high-voltage winding 2 and the low-voltage winding 3. Specifically, the extrusion section 8 includes a first extrusion sub-section 81 and a second extrusion sub-section 82 integrally connected, which form an angle structure by relative bending. The first extrusion sub-section 81 extends away from the second extrusion sub-section 82 and is connected to the first snap-fit ​​sub-section 71 at one end. The angle between the first extrusion sub-section 81 and the second extrusion sub-section 82 is set to an obtuse angle, that is, an angle relationship greater than 90 degrees. In other words, initially, the first extrusion sub-section 81 and the second extrusion sub-section 82 are straight, and then the second extrusion sub-section 82 is bent at an acute angle relative to the first extrusion sub-section 81 before installation. After the transformer is assembled, the second extrusion sub-part 82 simultaneously contacts the end face areas of the high-voltage winding 2 and the low-voltage winding 3 in a face-to-face manner. Its contact area is large, which can improve the uniformity of load distribution to a certain extent and effectively resist the axial deformation trend of the high-voltage winding 2 and the low-voltage winding 3 caused by short-circuit current.

[0041] In some implementations, such as Figure 1 , Figure 2 and Figure 3 As shown, the extrusion section 8 is also made of shape memory alloy material and is integrally formed by connecting the first extrusion sub-section 81 and the second extrusion sub-section 82, with a relative bending structure between them. Based on the connection between the first extrusion sub-section 81 and the first snap-fit ​​sub-section 71 at the end of the first extrusion sub-section 81 away from the second extrusion sub-section 82, the first extrusion sub-section 81 and the second extrusion sub-section 82 form an approximately perpendicular connection angle. In this structure, the material properties of the extrusion section 8 cause it to exhibit a significant morphological change trend under different temperature conditions.

[0042] For example, when the first extrusion sub-section 81 and the second extrusion sub-section 82 are bent relative to each other, it is a basic preset shape with an ambient temperature lower than the abnormal temperature. When the first extrusion sub-section 81 and the second extrusion sub-section 82 are in a straight state, it is an elastic deformation that occurs naturally after the ambient temperature is higher than the abnormal temperature. This transformation method can be adjusted according to the different adaptability of the selected materials.

[0043] It is understandable that when the transformer is not running, the temperature of the snap-fit ​​slot 41 or its surrounding environment is lower than the deformation temperature of the shape memory alloy. At this time, the first extrusion sub-part 81 and the second extrusion sub-part 82 remain in their initial preset bent state. This state is beneficial for the stable assembly of the high-voltage winding 2 and the low-voltage winding 3 at room temperature and for the initial fixing function of the snap-fit ​​structure. However, when the transformer enters the operating state or during a short-circuit fault, the heat generated by the transformer windings causes the temperature inside the snap-fit ​​slot 41 to rise, exceeding the deformation temperature of the shape memory alloy material. This triggers the material's recovery deformation tendency, and the first extrusion sub-part 81 and the second extrusion sub-part 82 tend to return to a straight shape. During this deformation process, the second extrusion sub-part 82 actively releases axial thrust towards the end faces of the high-voltage winding 2 and the low-voltage winding 3. This thrust has an adaptive characteristic of temperature control triggering, which can form a stronger resisting effect under the condition of increased transformer operating load, thereby suppressing the axial displacement of the windings caused by short-circuit impact to a certain extent and having a beneficial effect on improving short-circuit withstand capability.

[0044] In addition, to ensure good insulation performance of the structural components, the outer surfaces of the first snap-fit ​​sub-part 71, the second snap-fit ​​sub-part 72, the first extrusion sub-part 81, and the second extrusion sub-part 82 are all covered with an insulating rubber layer 10. This insulating rubber layer 10 is used to create a dielectric isolation environment between each sub-part and the internal electrical components of the transformer, which helps to reduce the risks of corona discharge and leakage, and improves the electrical safety and reliability of the components. At the same time, it can also further increase the friction between the snap-fit ​​part 7 and the inner wall of the snap-fit ​​groove 41, making it more difficult for the snap-fit ​​part 7 to detach from the snap-fit ​​groove 41. It can also increase the friction between the extrusion part 8 and the end walls of the high-voltage winding 2 and the low-voltage winding 3, improving the limiting effect. It should be noted that, as a covering layer, the flexibility and adhesion strength of the insulating rubber layer 10 need to be comprehensively considered when selecting materials to adapt to the morphological changes of the extrusion part 8 during the thermal deformation process, while maintaining a stable structural covering state in a high-temperature environment.

[0045] To further enhance the shape memory alloy component's responsiveness to temperature changes, a notch is provided in the insulating rubber layer 10, with the notch positioned at the connection point between the first snap-fit ​​part 71 and the second snap-fit ​​part 72. A second copper sheet 101 is adhered to the notch. The second copper sheet 101 possesses excellent thermal conductivity, enabling it to absorb heat from the end wall of the low-voltage winding 3 during transformer operation and transfer heat through the portion it adheres to. Structurally, a portion of the second copper sheet 101, facing away from the connection point between the first snap-fit ​​part 71 and the second snap-fit ​​part 72, is attached to the end wall of the low-voltage winding 3, while the other portion covers the corresponding connection point. In this way, the second copper sheet 101 forms an efficient heat conduction path from the end wall of the low-voltage winding 3 to the connection of the snap-fit ​​part, which can accelerate the response rate of the connection parts of the first snap-fit ​​part 71 and the second snap-fit ​​part 72 to external temperature changes to a certain extent, and promote the shape memory alloy to undergo timely shape changes at a suitable temperature, so that it can release more effective snap-fit ​​force and extrusion force in the operating state, thereby improving the structural stability support capability under short-circuit impact environment.

[0046] In summary, by adopting eight extrusion parts made of shape memory alloy, setting an insulating rubber layer 10, and setting thermally conductive copper sheets at key connection points, the internal components of the transformer not only have the adaptive adjustment capability driven by temperature control during operation, but also provide support for the synergistic effect of electrical insulation and thermal response mechanisms. The overall structure is more conducive to maintaining better structural stability and electrical safety of amorphous alloy transformers under complex electrical impact load conditions.

[0047] It is worth noting that when the second extrusion sub-parts 82 located at both ends of the high-voltage winding 2 and the low-voltage winding 3 apply axial abutment forces to the end walls of the high-voltage winding 2 and the low-voltage winding 3, a clamping force is formed. This clamping force can further restrict the radial deformation of the high-voltage winding 2 and the low-voltage winding 3, thereby further restricting the radial deformation of the high-voltage winding 2 and the low-voltage winding 3.

[0048] In some implementations, such as Figure 1 , Figure 2 and Figure 3As shown, the limiting part 9 is composed of a first limiting sub-part 91 and a second limiting sub-part 92. The first limiting sub-part 91 is vertically connected to the second extrusion sub-part 82 and is in contact with one inner side wall of the heat dissipation oil channel 11. The second limiting sub-part 92 is also vertically connected to the second extrusion sub-part 82, but is positioned at a certain distance from the first limiting sub-part 91 and is in contact with the other inner side wall of the heat dissipation oil channel 11. Based on the above structure, the two limiting sub-parts can form direct contact interfaces with the inner side walls of the heat dissipation oil channel 11 on both sides, thereby constraining the radial movement space of the second extrusion sub-part 82 to a certain extent. This constraint not only limits the tendency of the high-voltage winding 2 and the low-voltage winding 3 to approach each other radially, but also has a positive effect on the morphological stability of the internal space of the heat dissipation oil channel 11.

[0049] In practical applications, the placement of the limiting part 9 is flexible. For example, for a rectangular heat dissipation oil channel 11, the first limiting sub-part 91 and the second limiting sub-part 92 can be respectively positioned at different corners of the rectangular channel, so that each set of limiting parts 9 structures can form an effective support network around the heat dissipation oil channel 11 while ensuring unobstructed heat convection path. In this way, even when the transformer is subjected to strong short-circuit electrodynamic forces that cause overall deformation of the winding structure during operation, the limiting structure can still play a physical constraint role, thereby maintaining the gap between the high-voltage winding 2 and the low-voltage winding 3 to a certain extent and reducing the tendency of the two windings to approach each other in the radial direction.

[0050] The spaced arrangement of the first limiting sub-part 91 and the second limiting sub-part 92 in the structure helps to retain some ventilation space for the heat dissipation oil channel 11 while meeting the mechanical support requirements, thus promoting the maintenance of heat exchange efficiency. Simultaneously, both the first limiting sub-part 91 and the second limiting sub-part 92 are fixed by perpendicular connection to the second extrusion sub-part 82. This connection method facilitates the synchronous response of the first limiting sub-part 91 and the second limiting sub-part 92 to their base structure when the extrusion part 8 deforms due to temperature changes, thereby enhancing the overall structural coordination. Furthermore, the fit design between the first limiting sub-part 91 and the second limiting sub-part 92 and the inner wall of the heat dissipation oil channel 11 also requires control over material selection and processing precision to improve its contact stability and thermal adaptability.

[0051] Furthermore, through a reasonable layout, such as setting four sets of limiting parts 9 on one end wall of each high-voltage winding 2 and low-voltage winding 3, structural stability can be enhanced while controlling costs. This layout scheme constructs an effective structure to suppress the deformation trend of the windings without significantly increasing the number of components, while retaining the open channels of the cooling oil passages 11 in multiple directions, providing structural support for the transformer to maintain good heat exchange performance under high load and abnormal operation conditions. In summary, the addition of the limiting parts 9 allows the extrusion part 8 to generate axial thrust while also providing a certain radial structural support, thereby enhancing the amorphous alloy transformer's ability to cope with the complex deformation caused by short-circuit impacts to a certain extent.

[0052] Please refer to Figures 1-3 Secondly, some embodiments of this application also provide a method for manufacturing a short-circuit resistant amorphous alloy transformer, used to produce the short-circuit resistant amorphous alloy transformer of the first aspect, comprising the following steps: The non-alloy iron core is installed at the center of the housing 1, and the insulating cylinder 4 is sleeved on the outer periphery of the amorphous alloy iron core 5. A low-voltage winding 3 is wound around the outer peripheral wall of the insulating cylinder 4; The first annular insulating plate 111 is attached to the outer periphery of the low-voltage winding 3, and then the second annular insulating plate 112 is sleeved on the outer periphery of the first annular insulating plate 111. A spacer strip is connected between the first annular insulating plate 111 and the second annular insulating plate 112 to maintain the distance between the first annular insulating plate 111 and the second annular insulating plate 112, forming a heat dissipation oil channel 11. A high-voltage winding 2 is wound around the outer periphery of the second annular insulating plate 112; The snap-fit ​​part 7 is snapped onto the insulating cylinder 4, and the pressing part 8 is attached to the end walls of the high voltage winding 2 and the low voltage winding 3. At the same time, the limiting part 9 is inserted into the heat dissipation oil channel 11.

[0053] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A short-circuit resistant amorphous alloy transformer, characterized in that, The device includes a housing (1) and a high-voltage winding (2), a low-voltage winding (3), an insulating cylinder (4), and an amorphous alloy core (5) disposed within the housing (1). The insulating cylinder (4) is sleeved on the outer periphery of the amorphous alloy core (5). The low-voltage winding (3) is wound around the outer periphery of the insulating cylinder (4). The high-voltage winding (2) is wound around the outer periphery of the low-voltage winding (3). A heat dissipation oil channel (11) is reserved between the high-voltage winding (2) and the low-voltage winding (3). It also includes insulating support members (6), which are provided at both ends of the insulating cylinder (4) in multiple ways. Each insulating support member (6) has a snap-fit ​​part (7), a pressing part (8), and a limiting part (9). The snap-fit ​​part (7) is detachably connected to the insulating cylinder (4); The pressing part (8) is provided on the snap-fit ​​part (7) and is used to limit the axial displacement of the high voltage winding (2) and the low voltage winding (3); The limiting part (9) is provided on the extrusion part (8) and inserted into the heat dissipation oil channel (11) to limit the radial displacement of the high voltage winding (2) and the low voltage winding (3); The snap-fit ​​part (7) includes a first snap-fit ​​part (71) and a second snap-fit ​​part (72). The first snap-fit ​​part (71) and the second snap-fit ​​part (72) are integrally connected and configured to bend into a V-shape after elastic deformation. The end wall of the insulating cylinder (4) is axially provided with a snap-fit ​​groove (41) for the snap-fit ​​part (7) to be snapped into. The pressing part (8) is provided on the first snap-fit ​​part (71) and fits against the end walls of the high-voltage winding (2) and the low-voltage winding (3). When the transformer is not in operation, after the snap-fit ​​part (7) snaps into the snap-fit ​​groove (41), the second snap-fit ​​part (72) applies a contact force of N1 to the inner wall of the snap-fit ​​groove (41); When the transformer is running or short-circuited, after the snap-fit ​​part (7) snaps into the snap-fit ​​groove (41), the second snap-fit ​​part (72) applies a contact force of N2 to the inner wall of the snap-fit ​​groove (41); Where N2 > N1; The snap-fit ​​part (7) is made of shape memory alloy material to undergo elastic deformation or recovery deformation at temperatures above or below the abnormal temperature; wherein, When the transformer is not in operation, the temperature inside the snap-fit ​​groove (41) is lower than the abnormal temperature, and the first snap-fit ​​part (71) and the second snap-fit ​​part (72) remain in a V-shaped state. When the transformer is running or short-circuited, the temperature inside the snap-fit ​​groove (41) is higher than the abnormal temperature. The first snap-fit ​​part (71) and the second snap-fit ​​part (72) tend to deform into a straight state. At the same time, the second snap-fit ​​part (72) actively applies additional abutment force to the inner wall of the snap-fit ​​groove (41) so that N2 > N1. The inner bottom wall of the snap-fit ​​groove (41) is provided with a heat collection sub-groove (42). After the V-shaped first snap-fit ​​part (71) and second snap-fit ​​part (72) are snapped into the snap-fit ​​groove (41), the bent parts of the first snap-fit ​​part (71) and second snap-fit ​​part (72) are located in the heat collection sub-groove (42). A heat-conducting channel (43) is provided inside the insulating cylinder (4). One end of the heat-conducting channel (43) is connected to the heat-collecting sub-slot (42), and the other end is open towards the low-voltage winding (3). A first copper sheet (431) is embedded in the heat-conducting channel (43). One end of the first copper sheet (431) passes through the heat-conducting channel (43) and is bent and simultaneously attached to the outer wall of the insulating cylinder (4) and the inner wall of the low-voltage winding (3). The other end is bent and attached to the inner wall of the heat-collecting sub-slot (42). The extrusion section (8) includes a first extrusion sub-section (81) and a second extrusion sub-section (82) integrally connected, wherein the first extrusion sub-section (81) and the second extrusion sub-section (82) are bent relative to each other. The end of the first extrusion part (81) away from the second extrusion part (82) is connected to the first snap-fit ​​part (71), and the angle formed by the first extrusion part (81) and the second extrusion part (82) is an obtuse angle; The second extrusion sub-section (82) is simultaneously flat against the end faces of the high voltage winding (2) and the low voltage winding (3).

2. The short-circuit resistant amorphous alloy transformer according to claim 1, characterized in that, The extrusion section (8) is made of shape memory alloy material to undergo elastic deformation or recovery deformation at temperatures above or below the abnormal temperature; wherein, When the transformer is not in operation, the temperature of the connection between the first extrusion sub-section (81) and the second extrusion sub-section (82) is lower than the abnormal temperature, and the first extrusion sub-section (81) and the second extrusion sub-section (82) remain in a relatively bent state. When the transformer is in operation or short-circuited, the temperature at the connection point of the first extrusion sub-section (81) and the second extrusion sub-section (82) is higher than the abnormal temperature. The first extrusion sub-section (81) and the second extrusion sub-section (82) tend to deform into a straight state, while driving the second extrusion sub-section (82) to actively apply axial thrust to the end face of the high voltage winding (2) and the low voltage winding (3).

3. The short-circuit resistant amorphous alloy transformer according to claim 2, characterized in that, The surfaces of the first snap-fit ​​part (71), the second snap-fit ​​part (72), the first extrusion part (81) and the second extrusion part (82) are all covered with an insulating rubber layer (10).

4. The short-circuit resistant amorphous alloy transformer according to claim 3, characterized in that, The insulating rubber layer (10) has a notch at the connection point of the first snap-fit ​​part (71) and the second snap-fit ​​part (72), and a second copper sheet (101) is bonded to the notch. Part of the second copper sheet (101) has its side surface facing away from the connection point of the first snap-fit ​​part (71) and the second snap-fit ​​part (72) in contact with the end wall of the low voltage winding (3).

5. The short-circuit resistant amorphous alloy transformer according to any one of claims 1 to 4, characterized in that, The limiting part (9) includes a first limiting sub-part (91) and a second limiting sub-part (92), wherein, The first limiting sub-part (91) is vertically connected to the second extrusion sub-part (82), and the first limiting sub-part (91) is in contact with the inner sidewall of one side of the heat dissipation oil channel (11); The second limiting sub-part (92) is vertically connected to the second extrusion sub-part (82) and is spaced apart from the first limiting sub-part (91). The second limiting sub-part (92) is in contact with the inner wall of the other side of the heat dissipation oil channel (11).

6. A method for manufacturing a short-circuit resistant amorphous alloy transformer, characterized in that, The method for manufacturing a short-circuit resistant amorphous alloy transformer according to any one of claims 1 to 5 comprises the following steps: The non-alloy iron core is installed at the center of the housing (1), and the insulating cylinder (4) is fitted around the outer periphery of the amorphous alloy iron core (5). A low-voltage winding (3) is wound around the outer peripheral wall of the insulating cylinder (4); The first annular insulating plate (111) is attached to the outer periphery of the low-voltage winding (3), and then the second annular insulating plate (112) is fitted onto the outer periphery of the first annular insulating plate (111). A spacer strip is connected between the first annular insulating plate (111) and the second annular insulating plate (112) to maintain the distance between the first annular insulating plate (111) and the second annular insulating plate (112), forming a heat dissipation oil channel (11). A high-voltage winding (2) is wound around the outer periphery of the second annular insulating plate (112); The snap-fit ​​part (7) is snapped onto the insulating cylinder (4), and the pressing part (8) is attached to the end wall of the high voltage winding (2) and the low voltage winding (3), while the limiting part (9) is inserted into the heat dissipation oil channel (11).

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