A grading ring and a reactor

Abstract

The utility model discloses a kind of voltage equalizing ring and electric reactor, belong to electric reactor technical field, the voltage equalizing ring includes pipe assembly, pipe assembly is used to carry electric field balance, pipe assembly is shaped along first radian direction, plate assembly is connected in pipe assembly, plate assembly is installed by being parallel to magnetic field direction, plate assembly includes connecting plate and side plate, connecting plate is connected with pipe assembly along first radian direction setting, connecting plate is connected with side plate, and side plate is connected with pipe assembly, also disclose a kind of electric reactor.The utility model reduces the eddy current density of voltage equalizing ring hot spot by adding plate assembly inside pipe assembly, improve the effect of heat conduction simultaneously, effectively reduce the hotspot temperature rise of voltage equalizing ring eddy current loss heating, and pipe assembly independently optimizes electric field distribution, plate assembly focuses on heat dissipation and eddy current block, avoid function conflict.

Description

Technical Field

[0001] This utility model belongs to the field of reactor technology, and particularly relates to an equalizing ring and a reactor, specifically a dry-type hollow current-limiting reactor and an equalizing ring. Background Technology

[0002] In power systems, the enormous current generated by short-circuit faults severely threatens the stable operation of the power grid. Traditional oil-immersed insulated reactors are not only bulky and complex to maintain, but also pose risks of oil leakage and contamination. Dry-type air-core current-limiting reactors were developed to address these challenges. Their core utilizes a multi-layer encapsulated air-core coil structure, enabling them to significantly limit short-circuit currents in a very short time. Dry-type air-core current-limiting reactors offer advantages such as simple and reliable structure, linear inductance variation, excellent heat dissipation, high fire resistance, long service life, and strong overload capacity. With the continuous expansion of power grids and the sustained increase in short-circuit current levels, dry-type air-core current-limiting reactors, with their significant advantages, have become an indispensable safety barrier for suppressing short-circuit currents in modern substations, and are widely used in key areas such as new energy power plant access and data center power supply.

[0003] As a key component of dry-type air-core current-limiting reactors, the equalizing ring has two main functions. First, it equalizes the electric field strength at the ends to prevent corona discharge, which is its most important and core function. Second, it improves the voltage distribution, making the voltage distribution along the coil more uniform and avoiding insulation breakdown caused by excessive voltage gradients between turns or layers at the coil ends.

[0004] Dry-type air-core current-limiting reactors generate a strong leakage magnetic field due to their large AC current component. Under the leakage magnetic field, the aluminum equalizing ring will generate eddy current losses, resulting in a large temperature rise. Excessive temperature rise will cause annealing of the equalizing ring material and structural deformation, as well as accelerated aging of the insulation around the equalizing ring, among other serious problems.

[0005] In existing technologies, to solve the problem of overheating of equalizing rings, the diameter of the equalizing ring tube is increased to enhance heat dissipation, but this also increases eddy current losses. Alternatively, stainless steel materials can be used to reduce eddy current losses, but this will greatly increase costs. Therefore, the problem of excessive temperature rise of aluminum equalizing rings has not yet been well solved.

[0006] Therefore, there is an urgent need to design an equalizing ring and reactor to solve the problems mentioned above. Utility Model Content

[0007] The purpose of this invention is to provide an equalizing ring and a reactor, which has the advantage of reducing the temperature rise of hot spots caused by eddy current loss in the equalizing ring, and solves the problem of excessive temperature rise of the equalizing ring in existing dry-type hollow current-limiting reactors.

[0008] To achieve the above objectives, the specific technical solution of this utility model for an equalizing ring and reactor is as follows: An equalizing ring includes a tube assembly for carrying electric field equalization. The tube assembly is formed along a first arc direction. A plate assembly is connected inside the tube assembly. The plate assembly is installed parallel to the magnetic field direction. The plate assembly includes a connecting plate and a side plate. The connecting plate is arranged along the first arc direction and connected to the tube assembly. The connecting plate is connected to the side plate, and the side plate is connected to the tube assembly.

[0009] Furthermore, the length of the connecting plate is the same as the length of the pipe assembly.

[0010] Furthermore, there are two connecting plates, which are respectively connected to the upper and lower ends of the pipe assembly.

[0011] Furthermore, a first gap is provided between the two connecting plates to isolate the current path between the two connecting plates, and eddy currents form a closed loop inside a single connecting plate.

[0012] Furthermore, there are multiple side panels, which are arranged at the same intervals along the first arc direction.

[0013] Furthermore, the side plate includes a straight edge and an arc edge, with the straight edge connected to the arc edge, the straight edge connected to the connecting plate, and the arc edge connected to the pipe assembly.

[0014] Furthermore, the tube assembly includes a tube body and a ball head, with a plate assembly disposed within the tube body, and both ends of the tube body connected to the ball head.

[0015] Furthermore, a mounting bracket is fixedly connected to the pipe assembly.

[0016] A reactor includes the aforementioned equalizing rings, with multiple equalizing rings forming an equalizing ring group along a first arc direction. A second gap is provided between adjacent equalizing rings in the equalizing ring group to segment and disperse the eddy current path of the equalizing ring group.

[0017] Furthermore, the reactor also includes a star-shaped arm, with a coil connected to the inside of the star-shaped arm, and the top of the star-shaped arm is connected to the equalizing ring via a mounting bracket.

[0018] This invention has the following advantages: By adding a plate assembly inside the tube assembly, the eddy current density at the hot spot of the equalizing ring is reduced, and the heat conduction effect is improved. This effectively reduces the temperature rise of the hot spot caused by eddy current loss in the equalizing ring. Furthermore, the tube assembly independently optimizes the electric field distribution, while the plate assembly focuses on heat dissipation and eddy current blocking, thus avoiding functional conflicts. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the reactor of this utility model; Figure 2 This is a schematic diagram of the pipe assembly and mounting bracket of this utility model; Figure 3 This is a schematic diagram of the structure of the pipe assembly and plate assembly of this utility model; Figure 4 This is a schematic diagram of the structure of the plate assembly of this utility model; The markings in the diagram are as follows: 1. Equalizing ring; 11. Pipe assembly; 111. Pipe body; 112. Ball head; 12. Plate assembly; 121. Connecting plate; 122. Side plate; 13. Mounting bracket; 2. Star frame arm; 3. Coil; 4. Rain cap. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] Those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of this invention and form different embodiments. For example, in the claims, any of the claimed embodiments can be used in any combination.

[0022] The following is a reference to the appendix. Figure 1 To be continued Figure 4 This invention describes an equalizing ring and a reactor.

[0023] In existing technologies, to solve the problem of overheating of equalizing rings, the diameter of the equalizing ring tube is increased to enhance heat dissipation, but this also increases eddy current losses. Alternatively, stainless steel materials can be used to reduce eddy current losses, but this will greatly increase costs. Therefore, the problem of excessive temperature rise of aluminum equalizing rings has not yet been well solved.

[0024] Therefore, this equalizing ring 1 includes a tube assembly 11, which is used to carry electric field equalization. The tube assembly 11 is formed along the first arc direction A. A plate assembly 12 is connected inside the tube assembly 11. The plate assembly 12 is installed parallel to the magnetic field direction, so that the plate assembly 12 is adapted to the magnetic field and the eddy current of the plate assembly 12 itself is reduced from the source. The plate assembly 12 includes a connecting plate 121 and a side plate 122. The connecting plate 121 is set along the first arc direction A and connected to the tube assembly 11. The connecting plate 121 is connected to the side plate 122, and the side plate 122 is connected to the tube assembly 11. Both the connecting plate 121 and the side plate 122 are installed parallel to the magnetic field direction. Specifically, both the tube assembly 11 and the plate assembly 12 are made of aluminum.

[0025] The first arc direction A refers to the trajectory direction of the circumferential extension of the equalizing ring 1, that is, the circumferential unfolding direction of the equalizing ring body, and this direction is always along the curvature center axis of the equalizing ring group, forming a segmented equalizing ring group.

[0026] This invention reduces the eddy current density at the hot spot of the equalizing ring 1 by adding a plate assembly 12 inside the tube assembly 11, while improving the heat conduction effect. This effectively reduces the temperature rise of the hot spot caused by eddy current loss in the equalizing ring 1. Furthermore, the tube assembly 11 independently optimizes the electric field distribution, while the plate assembly 12 focuses on heat dissipation and eddy current blocking, thus avoiding functional conflicts.

[0027] Specifically, the connecting plate 121 is fixedly connected to the side plate 122, which can be fixed by welding. In other embodiments of this utility model, other fixing methods can also be used.

[0028] Preferably, the length of the connecting plate 121 is the same as the length of the tube assembly 11, so that the connecting plate 121 completely covers the electric field region of the tube assembly 11, eliminating the electric field distortion at the end. The equal length design maximizes the contact area between the connecting plate 121 and the inner wall of the tube assembly 11, allowing heat to be quickly dissipated. In other embodiments of this utility model, the length of the connecting plate 121 can also be other lengths, as long as the connecting plate 121 can quickly dissipate heat.

[0029] Preferably, there are two connecting plates 121, and the two connecting plates 121 are respectively connected to the upper and lower ends of the tube assembly 11. The upper and lower connecting plates 121 independently respond to leakage magnetic fields in different directions, avoiding additional losses caused by changes in the direction of the magnetic field in a single aluminum plate. In other embodiments of this utility model, the number of connecting plates 121 can also be other, such as one or more, as long as the connecting plates 121 can quickly dissipate heat.

[0030] A first gap is provided between the two connecting plates 121 to isolate the current path of the two connecting plates 121. Eddy currents form a closed loop inside a single connecting plate 121. The first gap forces the eddy currents to form a closed loop inside a single connecting plate 121, avoiding cross-layer large loop losses. The first gap also allows the connecting plate 121 to expand and contract freely, eliminating the risk of connection point cracking caused by thermal deformation. Specifically, the first gap is about 40mm. In other embodiments of this utility model, the first gap may be of other sizes.

[0031] Specifically, the thickness of the connecting plate 121 is 8mm. In other embodiments of this utility model, the thickness of the connecting plate 121 may be other values.

[0032] There are multiple side plates 122, which are arranged at the same interval along the first arc direction A. Preferably, there are 32 side plates 122, which are distributed at 3° intervals to cut off the transverse vortex at the edge of the pipe wall and eliminate the edge hot spot of the traditional solution. In other embodiments of this utility model, the number of side plates 122 can also be other, as long as the side plates 122 can cut off the transverse vortex at the edge of the pipe wall and eliminate the edge hot spot of the traditional solution.

[0033] Preferably, the side plate 122 is a thin-walled side plate with a thickness of 2mm. The thin-walled side plate increases the heat dissipation surface area, and the weight only increases by 8% compared to the solution without a side plate. In other embodiments of this utility model, the thickness of the side plate 122 can also be other values.

[0034] The side plate 122 includes a straight edge and an arc edge. The straight edge is connected to the arc edge and the connecting plate 121. The arc edge is connected to the pipe assembly 11. The straight edge is connected to the aluminum plate to provide rigid support. The arc edge fits against the pipe wall to disperse vibration stress and guides airflow along the pipe wall to enhance convection heat dissipation.

[0035] The connecting plate 121 is 8mm thick, the side plate 122 is 2mm thick, the number of side plates 122 is 32, and the spacing angle of the side plates 122 is 3 degrees. The temperature rise of the equalizing ring hot spot is the lowest, which can reduce the temperature rise of the equalizing ring hot spot by 19% compared with the case where no aluminum plate is installed.

[0036] The tube assembly 11 includes a tube body 111 and a ball head 112. The plate assembly 12 is disposed inside the tube body 111. Both ends of the tube body 111 are connected to the ball head 112. Specifically, the ball head 112 is a hemispherical ball head. The hemispherical ball head eliminates tip discharge at the connection point. The plate assembly 12 is built-in to avoid external electric field distortion.

[0037] Specifically, the ball head 112 is welded and sealed to the tube body 111 to prevent dust from entering and affecting the heat dissipation of the internal aluminum plate. In other embodiments of this utility model, the ball head 112 and the tube body 111 can also be fixed by other fixed connection methods.

[0038] A mounting bracket 13 is fixedly connected to the pipe assembly 11. The mounting bracket 13 directly transmits the weight and vibration force of the equalizing ring 1 to the star frame arm 2, avoiding deformation of the pipe body 111 under stress. Preferably, an insulating gasket can be installed between the mounting bracket 13 and the pipe body 111, so that the whole assembly does not need to be disassembled during maintenance.

[0039] A reactor includes the aforementioned equalizing ring 1. Multiple equalizing rings 1 form an equalizing ring group 1 along a first arc direction A. A second gap is provided between adjacent equalizing rings 1 in the equalizing ring group 1 to segment and disperse the eddy current path of the equalizing ring group 1. Through the second gap, multiple equalizing rings 1 form a segmented equalizing ring group 1, thereby blocking the heat conduction path. A single segment failure does not affect the overall operation.

[0040] The reactor also includes a star-shaped arm 2, which is a mechanical support structure that fixes the equalizing ring 1 and the coil 3. Its star-shaped design disperses mechanical stress, improves seismic resistance and overall rigidity, and avoids electric field distortion caused by displacement. The coil 3 is connected to the inner side of the star-shaped arm 2, and the top of the star-shaped arm 2 is connected to the equalizing ring 1 through a mounting bracket 13. A rain cap 4 is also connected to the star-shaped arm 2. The rain cap 4 is a protective top structure that prevents rainwater and dust from entering the coil 3 or the equalizing ring 1, ensuring long-term stable insulation performance. It is especially suitable for outdoor substations or new energy power plants and other environments.

[0041] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A pressure equalizing ring, characterized in that, It includes a tube assembly for carrying electric field equalization. The tube assembly is formed along a first arc direction. A plate assembly is connected inside the tube assembly. The plate assembly is installed parallel to the magnetic field direction. The plate assembly includes a connecting plate and a side plate. The connecting plate is set along the first arc direction and connected to the tube assembly. The connecting plate is connected to the side plate, and the side plate is connected to the tube assembly.

2. The equalizing ring according to claim 1, characterized in that, The length of the connecting plate is the same as the length of the pipe assembly.

3. The equalizing ring according to claim 1, characterized in that, There are two connecting plates, and the two connecting plates are respectively connected to the upper and lower ends of the pipe assembly.

4. The equalizing ring according to claim 3, characterized in that, A first gap is provided between the two connecting plates to isolate the current path between the two connecting plates, and eddy currents form a closed loop inside a single connecting plate.

5. The equalizing ring according to claim 1, characterized in that, The specific number of side panels is multiple, and the multiple side panels are arranged at the same interval along the first arc direction.

6. The equalizing ring according to claim 5, characterized in that, The side plate includes a straight edge and a curved edge. The straight edge is connected to the curved edge, the straight edge is connected to the connecting plate, and the curved edge is connected to the pipe assembly.

7. The equalizing ring according to claim 1, characterized in that, The tube assembly includes a tube body and a ball head. The plate assembly is located inside the tube body, and the two ends of the tube body are connected to the ball head.

8. The equalizing ring according to claim 1, characterized in that, The pipe assembly is fixedly connected to a mounting bracket.

9. A reactor, characterized in that, The device includes a pressure equalizing ring as described in any one of claims 1-8, wherein a plurality of pressure equalizing rings form a pressure equalizing ring group along a first arc direction, and a second gap is provided between adjacent pressure equalizing rings in the pressure equalizing ring group to segment and disperse the vortex path of the pressure equalizing ring group.

10. The reactor according to claim 9, characterized in that, It also includes a star frame arm, with a coil connected to the inside of the star frame arm, and the top of the star frame arm is connected to the equalizing ring through a mounting bracket.

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