Iron core clamping piece system of three-phase five-column iron core reactor
By improving the core clamping system and utilizing the design of through-core bolts and insulation components, the vibration problem of three-phase five-column core reactors during operation has been solved, achieving higher stability and reliability, and making it suitable for medium and large capacity reactors.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- TBEA HENGYANG TRANSFORMERS
- Filing Date
- 2025-04-08
- Publication Date
- 2026-04-14
AI Technical Summary
The vibration problem caused by magnetostriction in existing three-phase five-limb iron-core reactors during operation affects the safety and reliability of the reactors. The vibration is getting bigger and bigger in medium and large capacity products, leading to damage to insulation components and unreliable electrical connections.
The iron core clamping system, composed of a through-bolt, core tie rod, end tie rod, upper clamp, lower clamp, upper crossbeam, lower crossbeam, main pressure beam, secondary pressure beam, and main pad, ensures the insulation performance between the iron core and the clamps through insulating components and electrical connections, reducing vibration and deformation and improving stability.
It effectively suppresses reactor vibration, improves operational reliability, extends service life, and reduces losses and costs. It is suitable for medium and large capacity reactors.
Smart Images
Figure CN224123223U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of reactor technology, and in particular to the core clamping system of a three-phase five-limb core reactor. Background Technology
[0002] A three-phase five-limb iron-core reactor consists of three core columns and two side columns. The core columns and side columns are connected by yokes at the top and bottom. The two side columns and the upper and lower yokes form the outer frame of the three core columns and the coils they house. The core is typically made of high-quality, low-loss cold-rolled grain-oriented silicon steel sheets. The core column is divided into uniformly sized segments with multiple air gaps to ensure that the air gap remains unchanged during operation. The three-phase five-limb structure is equivalent to three single-phase reactors in the magnetic circuit, which reduces the reactor's size, lowers production costs, and enhances structural strength.
[0003] Since the ferromagnetic material of the reactor core is mainly silicon steel sheet, the magnetic domains of silicon steel will rotate in the same direction under the action of an external magnetic field, causing the silicon steel sheet to undergo magnetostriction. Magnetostriction will cause the core to vibrate, and the vibration period is closely related to the frequency of the applied excitation. Under power frequency voltage and current, the alternating magnetomotive force generates an alternating magnetic field. Under the action of the alternating magnetic field, the core will undergo elastic deformation and generate mechanical vibration. The vibration will increase with the operating time. The increase in vibration will lead to damage to the insulation components or unreliable electrical connections, affecting the operating safety of the reactor. Utility Model Content
[0004] Therefore, it is necessary to provide a core clamping system for a three-phase five-limb core reactor that can suppress vibration and improve the operational reliability of the reactor, in order to address the above problems.
[0005] A core clamping system for a three-phase five-column iron-core reactor includes a through-core screw, a core column pull screw, an end pull screw, an upper clamp, a lower clamp, an upper crossbeam, a lower crossbeam, a main pressure beam, a secondary pressure beam, and a main pad. The through-core screw passes through the limb plates of the upper and lower clamps at both ends and is insulated from each of the limb plates. The core column pull screw is electrically connected to the upper and lower crossbeams. The end pull screw is connected at both ends to the corresponding upper and lower clamps. One end of the end pull screw is insulated from the upper clamp and electrically connected to the lower clamp, or one end of the end pull screw is electrically connected to the upper clamp and insulated from the lower clamp.
[0006] In one embodiment, the upper clamp includes a front upper clamp and a rear upper clamp, the lower clamp includes a front lower clamp and a rear lower clamp, the upper crossbeam includes an A-phase upper crossbeam, a B-phase upper crossbeam, and a C-phase upper crossbeam, and the lower crossbeam includes an A-phase lower crossbeam, a B-phase lower crossbeam, and a C-phase lower crossbeam. The A-phase upper crossbeam, B-phase upper crossbeam, and C-phase upper crossbeam, respectively, together with their corresponding A-phase lower crossbeam, B-phase lower crossbeam, and C-phase lower crossbeam, form three pairs of crossbeams of the same phase. The four ends of each pair are connected to the front upper clamp, the rear upper clamp, the front lower clamp, and the rear lower clamp, respectively. The four ends of one pair of crossbeams are electrically connected to the front upper clamp, the rear upper clamp, the front lower clamp, and the rear lower clamp, respectively. One end of the four ends of the other two pairs of crossbeams is electrically connected to the corresponding upper clamp or lower clamp, and the other three ends are insulated from the corresponding upper clamp or lower clamp.
[0007] In one embodiment, the two ends of the main pressure beam, the secondary pressure beam, or the main pad are respectively connected to the corresponding upper front clamp, upper rear clamp, lower front clamp, or lower rear clamp, and one end of the two connection ends is an insulated connection, while the other end is an electrical connection.
[0008] In one embodiment, it also includes an upper side beam and a lower side beam, each having two ends connected to a front upper clamp, a rear upper clamp, a front lower clamp, and a rear lower clamp, with one end being an insulated connection and the other end being an electrical connection.
[0009] In one embodiment, the system achieves the insulating connection through an insulating component, which includes a cardboard gasket, a pulp-formed insulating tube, an anti-detachment pressure washer, a steel washer, a steel bolt, or a steel threaded rod, wherein the anti-detachment pressure washer is used to withstand pressure and prevent the pulp-formed insulating tube from falling off.
[0010] In one embodiment, the insulating connection structure has a pulp-formed insulating tube located between two metal parts that need to be insulated, with its two ends tightly abutting against the metal parts respectively; a cardboard gasket, an anti-detachment pressure gasket, and a steel gasket are sequentially fitted around the outer periphery of the pulp-formed insulating tube, and it is fixed by steel bolts or steel screws.
[0011] In one embodiment, the system achieves electrical connection through mutually contacting metal components; the metal components include flat mating surfaces without insulation layers or other barriers, and the electrical connection is achieved by the contact between the mating surfaces; the metal components include the metal structural parts of the core column pull rod, upper crossbeam, lower crossbeam, main pressure beam, secondary pressure beam, main pad, upper side beam, lower side beam, front upper clamp, front lower clamp, rear upper clamp, and rear lower clamp located at the electrical connection point.
[0012] In one embodiment, the front lower clamp and the rear lower clamp are fixedly connected to columns at both ends.
[0013] In one embodiment, the system is characterized by being grounded via a clamping system grounding wire, and all metal parts of the clamping system have one and only one grounding point.
[0014] In one embodiment, apart from a pair of crossbeams that are electrically connected to both the core tie rod and the two side clamps, all the metal parts are electrically connected at most one point or one end.
[0015] The core clamping system of the aforementioned three-phase five-limb iron-core reactor features a through-bolt that passes through the upper and lower clamp plates with both ends insulated from the plates. This ensures insulation between the core and the clamps while securing the core, preventing short circuits and other faults. One end of the pull rod is insulated from the upper clamp, while the other end is electrically connected to the lower clamp. This allows for flexible adjustment of the electrical connection method according to actual needs, ensuring both the clamps' secure hold on the core and meeting different electrical insulation requirements. The core column pull rod is electrically connected to the upper and lower crossbeams, facilitating a tight connection between the core column and the crossbeams. This effectively withstands the electromagnetic and mechanical stresses generated by the core during operation, reducing core vibration and deformation, improving the overall stability of the reactor, and extending its service life. The core clamping system of this three-phase five-limb iron-core reactor effectively suppresses reactor vibration and improves operational reliability. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0017] Figure 1 This is a schematic diagram of the core clamping system of a three-phase five-column core reactor provided in one embodiment of this utility model.
[0018] Figure 2 This is a top view of the core clamping system of a three-phase five-column core reactor provided in an embodiment of this utility model;
[0019] Figure 3 This is a schematic diagram of the side beam fixing and clamp insulation of the core clamping system of a three-phase five-column core reactor provided in one embodiment of the present invention;
[0020] Figure 4 This is a schematic diagram of the pads and clamps fixing insulation of the core clamping system of a three-phase five-column core reactor provided in one embodiment of the present invention;
[0021] Figure 5This is a schematic diagram of the main structure of the upper clamp of the core clamping system of a three-phase five-column core reactor provided in an embodiment of this utility model;
[0022] Figure 6 This is a top view of the upper clamp of the core clamping system of a three-phase five-column core reactor provided in an embodiment of this utility model;
[0023] Figure 7 This is a schematic diagram of the main structure of the lower clamp of the core clamping system of a three-phase five-column core reactor provided in an embodiment of this utility model;
[0024] Figure 8 This is a top view of the lower clamping main structure of the core clamping system of a three-phase five-column core reactor provided in an embodiment of this utility model;
[0025] Figure 9 This is a schematic diagram of the insulating connection structure between metal parts of the core clamping system of a three-phase five-column core reactor provided in an embodiment of this utility model.
[0026] To make the above and other objects, features, advantages and embodiments of this utility model more apparent and understandable, the appended symbols are explained as follows:
[0027] 1. Core column; 2. Upper yoke; 3. Side yoke; 4. Lower yoke; 5. Core column tie rod; 6. End tie rod; 7. Through-core tie rod; 8. Upper side beam; 9. Front upper clamp; 10. Front lower clamp; 11. Rear upper clamp; 12. Rear lower clamp; 13. Phase A upper crossbeam; 14. Phase B upper crossbeam; 15. Phase C upper crossbeam; 16. Phase A lower crossbeam; 17. Phase B lower crossbeam; 18. Phase C lower crossbeam; 19. Main pressure beam; 20. 21. Main pad; 22. Phenolic paper tube; 23. Cardboard gasket; 24. Pulp forming insulating tube; 25. Anti-detachment pressure washer; 26. Steel washer; 27. Steel bolt or steel threaded rod; 28. Oil tank; 29. Upper crossbeam; 30. Lower crossbeam; 31. Insulating oil; 32. Lower test beam; 33. Grounding wire of clamping system; 34. Insulating washer; 35. Steel pad; 36. Insulating board; 37. Secondary pressure beam; 38. Lower clamping column. Detailed Implementation
[0028] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.
[0029] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0031] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0032] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0033] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.
[0034] The core clamping systems in existing medium- and large-capacity three-phase five-limb core reactors are ineffective at suppressing braking, resulting in significant product vibration. Furthermore, the vibration of some products increases during operation. Due to the increasing vibration and the poor reliability of the insulation components used in the core clamping system, some products experience insulation damage during operation, leading to localized overheating or even burnout. In some products, the same-potential connection is vibrated out or broken, causing floating discharge of metal components. Due to unreliable electrical connections, short-circuit loops exist in the clamping system, where alternating magnetic flux generates current and losses. When the product capacity is small, these losses only cause localized temperature increases, but when the capacity is large, they cause localized overheating or burnout. This invention addresses these problems by providing a core clamping system for a three-phase five-limb core reactor that is simple in structure, easy to manufacture, low in cost, low in losses, has strong vibration resistance, and high reliability, enabling the use of a three-phase integrated core in medium- and large-capacity reactors.
[0035] See Figures 1 to 2 This utility model provides a core clamping system for a three-phase five-column core reactor, comprising a through-core screw, a core column pull screw, an end pull screw, an upper clamp, a lower clamp, an upper crossbeam, a lower crossbeam, a main pressure beam, a secondary pressure beam, and a main pad. The through-core screw passes through the limb plates of the upper and lower clamps at both ends and is insulated from each of the limb plates. The core column pull screw is electrically connected to the upper and lower crossbeams. The end pull screw is connected at both ends to the corresponding upper and lower clamps. One end of the end pull screw is insulated from the upper clamp and electrically connected to the lower clamp, or one end of the end pull screw is electrically connected to the upper clamp and insulated from the lower clamp.
[0036] The core clamping system of the aforementioned three-phase five-limb iron-core reactor features a through-bolt that passes through the upper and lower clamp plates with both ends insulated from the plates. This ensures insulation between the core and the clamps while securing the core, preventing short circuits and other faults. One end of the pull rod is insulated from the upper clamp, while the other end is electrically connected to the lower clamp. This allows for flexible adjustment of the electrical connection method according to actual needs, ensuring both the clamps' secure hold on the core and meeting different electrical insulation requirements. The core column pull rod is electrically connected to the upper and lower crossbeams, facilitating a tight connection between the core column and the crossbeams. This effectively withstands the electromagnetic and mechanical stresses generated by the core during operation, reducing core vibration and deformation, improving the overall stability of the reactor, and extending its service life. The core clamping system of this three-phase five-limb iron-core reactor effectively suppresses reactor vibration and improves operational reliability.
[0037] In an exemplary embodiment, the upper clamp includes a front upper clamp and a rear upper clamp, the lower clamp includes a front lower clamp and a rear lower clamp, the upper crossbeam includes an A-phase upper crossbeam, a B-phase upper crossbeam, and a C-phase upper crossbeam, and the lower crossbeam includes an A-phase lower crossbeam, a B-phase lower crossbeam, and a C-phase lower crossbeam. The A-phase upper crossbeam, B-phase upper crossbeam, and C-phase upper crossbeam, respectively, together with their corresponding A-phase lower crossbeam, B-phase lower crossbeam, and C-phase lower crossbeam, form three pairs of crossbeams of the same phase. The four ends of each pair are connected to the front upper clamp, the rear upper clamp, the front lower clamp, and the rear lower clamp, respectively. The four ends of one pair of crossbeams are electrically connected to the front upper clamp, the rear upper clamp, the front lower clamp, and the rear lower clamp, respectively. One end of the four ends of the other two pairs of crossbeams is electrically connected to the corresponding upper clamp or lower clamp, and the other three ends are insulated from the corresponding upper clamp or lower clamp. The front upper clamp, rear upper clamp, front lower clamp, and rear lower clamp are interconnected with the upper and lower crossbeams of phases A, B, and C, forming a relatively stable frame structure. The three pairs of crossbeams for each phase are connected to four clamps, making the physical structure of the clamping system more robust and reducing the risk of loose connections or component damage due to vibration. The design of electrically connecting all four ends of one pair of crossbeams, and electrically connecting one end and insulating the other three ends of the other two pairs of crossbeams, helps to achieve a reasonable distribution and balance of current among different phases. This allows for flexible control of the current in each phase, reduces electromagnetic coupling between different phases, and improves the reliability of the reactor.
[0038] In an exemplary embodiment, the two ends of the main pressure beam, secondary pressure beam, or main pad are respectively connected to the corresponding front upper clamp, rear upper clamp, front lower clamp, or rear lower clamp, with one end of each connection being an insulated connection and the other end being an electrical connection. The main pressure beam, secondary pressure beam, and main pad, along with the front and rear upper and lower clamps, can cooperate with the connections of other components to form a stable rigid frame for the entire clamping system, improving vibration resistance and effectively preventing the occurrence of short-circuit rings, thus ensuring the stability of insulation.
[0039] In an exemplary embodiment, the system further includes an upper side beam and a lower side beam, each having two ends connected to a front upper clamp, a rear upper clamp, a front lower clamp, and a rear lower clamp, respectively, with one end being an insulated connection and the other end being an electrical connection. When the reactor is subjected to vibration during operation, the upper and lower side beams can better disperse and withstand external forces, reducing relative displacement and loosening between components, improving the vibration resistance of the clamping system, and ensuring the stability of the reactor operation.
[0040] In an exemplary embodiment, the system achieves the insulating connection through an insulating component, which includes a cardboard gasket, a pulp-formed insulating tube, an anti-detachment pressure washer, a steel washer, a steel bolt, or a steel threaded rod, wherein the anti-detachment pressure washer is used to withstand pressure and prevent the pulp-formed insulating tube from falling off.
[0041] In an exemplary embodiment, the insulating connection structure has a pulp-formed insulating tube located between two metal parts that require insulating connection, with its two ends tightly abutting against the metal parts respectively; a cardboard gasket, an anti-detachment pressure gasket, and a steel gasket are sequentially fitted around the outer periphery of the pulp-formed insulating tube, and it is fixed by steel bolts or steel screws.
[0042] In an exemplary embodiment, the system achieves electrical connection through mutually contacting metal components; the metal components include flat mating surfaces without insulation layers or other barriers, and the electrical connection is achieved through the contact between the mating surfaces; the metal components include the metal structural parts of the core column pull rod, upper crossbeam, lower crossbeam, main pressure beam, secondary pressure beam, main pad, upper side beam, lower side beam, front upper clamp, front lower clamp, rear upper clamp, and rear lower clamp located at the electrical connection points.
[0043] In an exemplary embodiment, the front lower clamp and the rear lower clamp are fixedly connected to columns at both ends.
[0044] In an exemplary embodiment, the system is characterized by being grounded via a clamping system grounding wire, with all metal components of the clamping system having only one grounding point. This avoids multiple grounding points on the metal components, effectively preventing the formation of short-circuit loops. Under the electromagnetic induction environment of the main and leakage fluxes, short-circuit loops generate circulating current and resistance losses. This connection method reduces such losses, lowers the overall product loss, avoids excessively high local temperatures, prevents insulation system collapse or even product burnout, and ensures the rationality and safety of the electrical connection.
[0045] In one exemplary embodiment, apart from a pair of crossbeams electrically connected to both the core tie rod and the two side clamps, all metal parts are electrically connected at most one point or one end.
[0046] In existing technology, the main structure of the reactor, consisting of a core column 1, upper yoke 2, side yokes 3, phenolic paper tube 21, cardboard gasket 22, and insulating gasket 33, has an independent three-phase core. Its advantage is that each of the three phase cores is independent, making it suitable for products of any capacity. However, its disadvantages are: First, the six side yokes 3 not only result in a huge amount of material used themselves, but also in a huge amount of oil tank 27 and insulating oil 30, leading to a large product volume, total loss, and floor space. Second, the phenolic paper tube 21 is brittle and has low mechanical strength, frequently damaged by vibration during manufacturing and operation, causing more short-circuit rings in the core clamps. Under the electromagnetic induction of the main and leakage fluxes, these short-circuit rings... The following issues arise: First, circulating current and resistance loss are generated during operation. This can lead to increased total product losses and localized high temperatures, or even the collapse of the entire insulation system and product burnout. This is why existing technologies can only manufacture small-capacity three-phase reactors. Second, the welding or crimping between the conductor and the terminal block of the insulating washer 33 is frequently broken by vibration, and the bolts at both ends are frequently dislodged, resulting in floating potential of the metal sheet, causing discharge or even breakdown. Third, the connection between the two ends of the main pressure beam 19 and the main pad 20 and the limb plates of the front upper clamp 9, front lower clamp 10, rear upper clamp 11, and rear lower clamp 12 is made by a single-row hole wire connection, resulting in poor strength and stability of the clamp system. Compared with existing technologies, this utility model provides scientifically reliable insulation and electrical connections. The designed strength and stability are stronger and more reliable, ensuring that all metal parts in the clamping system have one and only one grounding point; the clamping system has no short-circuit loops in any direction; all insulating parts in the clamping system have high electrical and mechanical reliability; and all electrical connections in the clamping system are immune to damage. Based on the basic principles of this utility model, Figure 3 The insulation system shown has high electrical and mechanical strength and Figure 4 The highly reliable electrical connection system shown is applied to Figure 9 The core clamping system shown is then applied to Figure 1 , Figure 2The three-phase integrated three-phase five-column iron core of this utility model, as shown, saves a lot of raw materials compared to existing technologies, and has a small product size, low loss, and small footprint. This allows for the addition of end tie rods 6 in addition to the core column tie rods 5, and the addition of auxiliary tie beams 36 in addition to the main tie beams 19, which, together with the main pads 20, press the iron core column 1, resulting in stronger pressing capacity. Not only is the auxiliary tie beam 36 added, but the upper crossbeam 13 of phase A, the upper crossbeam 14 of phase B, the upper crossbeam 15 of phase C, the lower crossbeam 16 of phase A, the lower crossbeam 17 of phase B, the lower crossbeam 18 of phase C, the main tie beam 19, the auxiliary tie beam 36, and the main pads 20 are all connected to the limb plates of the front upper clamp 9, the front lower clamp 10, the rear upper clamp 11, and the rear lower clamp 12 with single-row hole connections. This makes the entire clamping system a more stable rigid frame with strong vibration resistance. Columns 37 are fixedly connected to both ends of the front lower clamp 10 and the rear lower clamp 12, forming the core clamping system of a three-phase five-column iron-core reactor together with the core column 1. This utility model is applied to... Figures 1 to 9 The basic configuration is as follows: the front upper clamp 9 is insulated from the front lower clamp 10, and the rear upper clamp 11 is insulated from the rear upper clamp 12. That is, the two ends of the corresponding end-pull screw 6 are connected to the corresponding clamps 9, 10, 11, and 12 respectively, with one end being insulated and the other electrically connected. The two ends of the through-core screw 7 pass through the limb plates of the corresponding clamps 9, 10, 11, and 12 insulated manner, and both ends are insulated. The core pull screw 5 is electrically connected to the upper crossbeams 13, 14, and 15, and the lower crossbeams 16, 17, and 18. The first pair of upper crossbeams 13 and lower crossbeams 16, the second pair of upper crossbeams 14 and lower crossbeams 17, and the third pair of upper crossbeams 15 and lower crossbeams 18 form three pairs of the same phase, each pair having four ends connected to the front upper clamp 9, 10, 11, and 12 respectively. The upper rear clamp 11, lower front clamp 10, and lower rear clamp 12 are connected. One pair has four ends electrically connected to the upper front clamp 9, upper rear clamp 11, lower front clamp 10, and lower rear clamp 12 respectively. The other two pairs must each have only one end electrically connected, with the other three ends being insulated connections. The main pressure beam 19, secondary pressure beam 36, main pad 20, upper side beam 8, and lower side beam 31 each have two ends connected to the upper front clamp 9, upper rear clamp 11, lower front clamp 10, and lower rear clamp 12. One end must be insulated while the other end is electrically connected. All insulated connections consist of cardboard washers 22, pulp-formed insulating tubes 23, anti-detachment pressure washers 24, steel washers 25, and steel bolts or steel threaded rods 26. Figure 3 The connection shown or similar in structure, the anti-detachment pressure washer 24 serves to withstand pressure and prevent the pulp forming insulating tube 23 from falling off, and can be made of metallic or non-metallic materials; all electrical connections are... Figure 4The metal surfaces are in direct contact; the entire clamping system is grounded via clamping system grounding wire 33. This insulation and electrical connection between the metal parts ensures that all metal parts in the clamp are grounded at only one point or end; apart from the central column screw 5 and the pair of crossbeams electrically connected to both clamps on both sides, all metal parts are electrically connected at most one point or end, thus eliminating any short-circuit loops. The electrical and mechanical strength of the pulp-formed insulating tube 23 is far superior to that of the phenolic paper tube 21, resulting in high reliability of the insulation connection. Therefore, this invention overcomes the shortcomings of existing technologies, such as high vibration, high loss, high cost, and poor reliability, enabling the implementation of a three-phase integrated structure in medium and large capacity products, while reducing vibration, loss, and cost and improving reliability.
[0047] In the past, to ensure the tightness between various clamping components, before the use of through bolts, pressure beam structures were typically used to connect and clamp the various parts. This method ensured that the whole structure formed a stable rigid frame, but had a relatively small impact on the internal structure. At the same time, using too many pressure beam structures would reduce the space margin on the clamping components. When the product has some special requirements, less space margin would increase the design difficulty and make it difficult to ensure that the product design requirements are met.
[0048] This invention uses a through-bolt to replace part of the pressure beam, which, compared to the old structure, not only maintains the original advantages but also improves upon its shortcomings. The through-bolt enhances the connection strength between the clamping parts, allowing for a reduction in the number of pressure beams in the old structure. This increases the usable space of the entire three-phase reactor; the space previously used for pressure beams can be used to improve the spatial margin between various parts on the clamping parts, increasing the spatial distance between them. This ensures that the overall product structure has more space to meet the special requirements of special products. The through-bolt also helps connect and fix the core, coils, and other internal structures. This new structure improves the mechanical strength of the reactor, making the internal structures such as the core laminations more stable. This reduces internal vibration and improves the connectivity and structure between the various parts of the three-phase reactor.
[0049] Furthermore, the through-core bolt can reduce internal mechanical vibration of the core by tightening the core laminations. This is superior to the pressure beam structure. Reducing internal mechanical vibration not only reduces vibration and noise but also ensures the stability of internal components, significantly extending the overall product lifespan. Vibration and noise reduction minimize unnecessary energy loss and enhance the product's market competitiveness. With increasingly stringent standards for transformers and other electronic products, using this new structure is a more market-oriented choice.
[0050] In addition, the application of through-bolts has reduced the overall structure of three-phase reactors. Compared with the original pressure beam structure, the height of the new structure reactor using through-bolts can be reduced by 100-200mm, and the overall structure is more stable. At the same time, the thickness of the clamping plate in the new structure can also be reduced, which reduces material consumption, lowers costs, and makes the product itself achieve the effect of cost reduction and efficiency improvement.
[0051] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0052] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.
Claims
1. A core clamping system for a three-phase five-limb core reactor, characterized in that, It includes a through-bolt, a core-column pull rod, an end-pull rod, an upper clamp, a lower clamp, an upper crossbeam, a lower crossbeam, a main pressure beam, a secondary pressure beam, and a main pad; wherein, both ends of the through-bolt pass through the limb plates of the upper and lower clamps and are insulated from each of the limb plates; the core-column pull rod is electrically connected to the upper and lower crossbeams; both ends of the end-pull rod are respectively connected to the corresponding upper and lower clamps; one end of the end-pull rod is insulated from the upper clamp and the other end is electrically connected to the lower clamp, or one end of the end-pull rod is electrically connected to the upper clamp and the other end is insulated from the lower clamp.
2. The core clamping system of the three-phase five-limb core reactor according to claim 1, characterized in that, The upper clamp includes a front upper clamp and a rear upper clamp, the lower clamp includes a front lower clamp and a rear lower clamp, the upper crossbeam includes an A-phase upper crossbeam, a B-phase upper crossbeam, and a C-phase upper crossbeam, and the lower crossbeam includes an A-phase lower crossbeam, a B-phase lower crossbeam, and a C-phase lower crossbeam. The A-phase upper crossbeam, B-phase upper crossbeam, and C-phase upper crossbeam, respectively, together with their corresponding A-phase lower crossbeam, B-phase lower crossbeam, and C-phase lower crossbeam, form three pairs of crossbeams of the same phase. The four ends of each pair are connected to the front upper clamp, the rear upper clamp, the front lower clamp, and the rear lower clamp, respectively. The four ends of one pair of crossbeams are electrically connected to the front upper clamp, the rear upper clamp, the front lower clamp, and the rear lower clamp, respectively. One end of the four ends of the other two pairs of crossbeams is electrically connected to the corresponding upper or lower clamp, and the other three ends are insulated from the corresponding upper or lower clamp.
3. The core clamping system of the three-phase five-limb core reactor according to claim 1, characterized in that, The two ends of the main pressure beam, the secondary pressure beam, or the main pad are respectively connected to the corresponding front upper clamp, rear upper clamp, front lower clamp, or rear lower clamp, and one end of the two connection ends is an insulated connection, while the other end is an electrical connection.
4. The core clamping system of the three-phase five-limb core reactor according to claim 1, characterized in that, It also includes an upper side beam and a lower side beam, each of which has two ends connected to the front upper clamp, the rear upper clamp, the front lower clamp, and the rear lower clamp, respectively, with one end being an insulated connection and the other end being an electrical connection.
5. The core clamping system of a three-phase five-limb core reactor according to any one of claims 1-4, characterized in that, The system achieves the insulating connection through insulating components, which include cardboard washers, pulp-formed insulating tubes, anti-detachment pressure washers, steel washers, steel bolts or steel screws, wherein the anti-detachment pressure washers are used to withstand pressure and prevent the pulp-formed insulating tubes from falling off.
6. The core clamping system of the three-phase five-limb core reactor according to claim 5, characterized in that, In the insulating connection structure, the pulp forming insulating tube is located between two metal parts that need to be insulated, with its two ends tightly abutting against the metal parts respectively; the outer periphery of the pulp forming insulating tube is sequentially fitted with a cardboard gasket, an anti-detachment pressure gasket, and a steel gasket, which are fixed by steel bolts or steel screws.
7. The core clamping system of the three-phase five-limb core reactor according to any one of claims 1-4, characterized in that, The system achieves electrical connection through mutually contacting metal components; the metal components include flat mating surfaces without insulation layers or other barriers, and electrical connection is achieved through the contact between the mating surfaces; the metal components include the metal structural parts of the core column pull rod, upper crossbeam, lower crossbeam, main pressure beam, secondary pressure beam, main pad, upper side beam, lower side beam, front upper clamp, front lower clamp, rear upper clamp, and rear lower clamp located at the electrical connection points.
8. The core clamping system of the three-phase five-limb core reactor according to claim 2, characterized in that, The front lower clamp and the rear lower clamp are fixedly connected to columns at both ends.
9. The core clamping system of the three-phase five-limb core reactor according to claim 1, characterized in that, The system is grounded through a clamping system grounding wire, and all metal parts of the clamping system have one and only one grounding point.
10. The core clamping system of the three-phase five-limb core reactor according to claim 1, characterized in that, Except for a pair of crossbeams that are electrically connected to the core tie rod and the clamps on both sides, all metal parts are electrically connected at most one point or one end.