Busbar and busbar assembly

Abstract

This utility model discloses a busbar and busbar assembly. The busbar includes a hollow busbar tube and a busbar plate disposed within the busbar tube. The busbar plate extends along the length of the busbar tube, and its two ends in the width direction are integrally formed with the inner wall of the busbar tube to divide the inner cavity of the busbar tube into two independent chambers. At least one end of the busbar plate in the length direction protrudes outside the busbar tube to form a mounting portion. This mounting portion is exposed on at least one side in the thickness direction of the busbar plate to form a mounting surface. This utility model can effectively reduce the skin effect through the busbar tube and form a heat dissipation channel inside. The busbar plate can carry part of the current, especially when the busbars are overlapped, it carries the main current. The fact that one or both ends of the busbar plate extend outside the busbar tube to form a mounting portion simplifies the connection and fixing operation between busbars and improves assembly efficiency.

Description

Technical Field

[0001] This utility model relates to the field of power technology, and in particular to a busbar and busbar assembly. Background Technology

[0002] Busbars are critical conductors in power systems used to connect distribution or transformation equipment, and their core functions include the collection, distribution, and transmission of electrical energy. Under operating conditions, busbars must carry large currents and have a high surface potential. The Joule heating generated by the large current can cause the busbar temperature to rise, while the electromagnetic forces between different phase busbars can lead to dynamic and thermal stability issues. Furthermore, under high voltage, it is essential to ensure the insulation performance between conductors or between conductors and grounded metal components. Temperature rise control, dynamic and thermal stability, and insulation performance are fundamental requirements for busbar design, requiring comprehensive consideration of technical parameters such as current carrying capacity, heat dissipation performance, mechanical strength, and electric field distribution.

[0003] Currently, solid rectangular busbars and hollow tubular busbars are commonly used in power systems. Hollow tubular busbars typically have a circular or D-shaped cross-section. Due to the "skin effect" when alternating current passes through the busbar, the current density on the conductor surface is high, while the current density in the core is low. Hollow tubular busbars, by eliminating the core conductor material, effectively reduce dependence on raw materials. Furthermore, the heat dissipation channels formed by their inner diameter and their near-circular tube structure give them superior overall performance compared to solid busbars, thus offering significant advantages in practical applications.

[0004] However, the currently used hollow tubular busbars have the following shortcomings: Although D-shaped tubular busbars have mounting surfaces, their current-carrying capacity design is conservative, and the irregular cross-section leads to uneven electric field distribution. Circular tubular busbars have lower skin effect coefficients, regular structures, uniform electric field distribution, and high mechanical strength, but lack mounting surfaces and require flattening with molds or clamp connections to achieve overlap, resulting in increased manufacturing costs. Utility Model Content

[0005] This utility model addresses the technical problems existing in the prior art by providing a busbar and busbar assembly. Through structural design optimization, it combines the structural advantages of tubular busbars with an installation surface, so as to facilitate the overlapping function between busbars.

[0006] The technical solution adopted by this utility model to solve its technical problem is: a busbar, including a hollow busbar tube and a busbar plate disposed in the busbar tube, the busbar plate extending along the length direction of the busbar tube, and the two ends of the busbar plate in the width direction being integrally formed with the inner wall surface of the busbar tube to divide the inner cavity of the busbar tube into two independent chambers; at least one end of the busbar plate is exposed outside the busbar tube to form a mounting part, and the mounting part is exposed on at least one side in the thickness direction of the busbar plate to form a mounting surface.

[0007] In a preferred embodiment, a notch is provided on the side wall of one end of the busbar corresponding to the installation part. The notch occupies half of the area of the side wall of this end of the busbar, and the notch corresponds to one side of the installation part in the thickness direction of the busbar plate, so that one side of the installation part in the thickness direction of the busbar plate is completely exposed; the other side of the installation part in the thickness direction of the busbar plate is blocked by the remaining part of the side wall of this end of the busbar; the central axis of the busbar is collinear with the center line of the installation surface in the length direction of the busbar plate.

[0008] In a preferred embodiment, the installation part is provided with at least one installation hole, and the installation hole is arranged through in the thickness direction of the busbar plate.

[0009] In a preferred embodiment, the installation part is provided with at least one installation hole, and the installation hole is arranged through in the thickness direction of the busbar plate; a relief hole is provided on the remaining part of the side wall of one end of the busbar corresponding to the installation part, and the relief hole corresponds to the at least one installation hole.

[0010] In a preferred embodiment, both ends of the busbar plate in the length direction are exposed outside the busbar, and the installation parts are respectively formed; the installation surfaces of each installation part are on the same side of the busbar plate in the thickness direction.

[0011] In a preferred embodiment, the cross-section of the busbar is circular or oval or square, and it cooperates with the cross-section shape of the busbar plate to form a shape like a Chinese character 'Ri' or a shape like the Greek letter 'Θ'; the busbar plate is a flat plate, and the installation surface is a plane.

[0012] The present utility model further provides a busbar assembly, including a plurality of busbars as described in the above present utility model. The plurality of busbars are arranged in sequence along the length direction of the busbar, and adjacent busbars are connected through their respective installation parts, and the installation surfaces of the two connected installation parts are abutted against each other.

[0013] In a preferred embodiment, the respective installation parts of the adjacent busbars are connected through a first fastener. The first fastener includes a bolt and a nut. The screw rod of the bolt sequentially passes through the installation holes provided in the respective installation parts of the adjacent busbars and is threadedly connected with the nut; the installation surfaces of the two connected installation parts are fitted together.

[0014] In a preferred embodiment, it further includes at least one electrically conductive grading ring, and the grading ring is sleeved outside the connection part of the adjacent busbars.

[0015] In a preferred embodiment, the equalizing ring is connected to at least one of the adjacent busbars using a second fastener; the second fastener is a set screw, which is threadedly connected to a threaded hole in the sidewall of the equalizing ring, and the tail end of the set screw is inserted into a positioning hole in the sidewall of the busbar of the corresponding busbar; the mounting portion of each of the adjacent busbars is located inside the equalizing ring.

[0016] In a preferred embodiment, the busbar has a circular cross-section, the equalizing ring has a circular cross-section, the equalizing ring has a constant inner diameter, and the equalizing ring has an outer diameter that gradually decreases from the middle to both ends, so that the outer surface of the equalizing ring has an arc-shaped curved surface that bulges outward from the middle.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The busbar structure of this utility model includes a busbar tube and a busbar plate disposed inside the busbar tube. The hollow design of the busbar tube effectively reduces the skin effect and forms a heat dissipation channel inside, thereby improving heat dissipation efficiency. The busbar plate, as a conductive core component, can carry a portion of the current, especially when busbars are overlapped, as it bears the main current path. Simultaneously, the busbar plate, as a central reinforcing structure of the busbar tube, significantly enhances the overall strength and rigidity of the busbar, enabling it to withstand greater support spans during installation. Furthermore, the busbar plate forms inherent mounting surfaces on both sides in the width direction, facilitating the positioning and clamping of the busbar; one or both ends of the busbar plate protrude outside the busbar tube, forming a mounting portion, further simplifying the connection and fixing operations between busbars and improving assembly efficiency.

[0019] 2. In a preferred embodiment, half of the sidewall at the end of the busbar corresponding to the mounting portion is notched, so that one side of the mounting portion in the thickness direction of the busbar plate is fully exposed to form a mounting surface, while the other side of the mounting portion in the thickness direction of the busbar plate is covered by the corresponding sidewall of the busbar, thus retaining a portion of the sidewall at the end of the busbar corresponding to the mounting portion. When busbars overlap, the retained portion of the sidewall can be butt-jointed to form a relatively complete sidewall structure, thereby effectively improving the uniformity of the electric field distribution at the busbar connection and reducing the risk of local corona discharge.

[0020] 3. The cross-sectional shape of the busbar is preferably circular or elliptical, which makes the busbar shape regular, with a small skin effect coefficient, uniform electric field distribution, and high mechanical strength.

[0021] 4. As a preferred embodiment, the mounting portions between adjacent busbars are connected by a first fastener. This not only improves the ease of connection but also allows the first fastener to be housed inside the busbar conduit. The shielding effect of the busbar conduit makes the electric field distribution more uniform, thereby reducing the risk of localized electric field concentration. This structural design reduces the requirements for surrounding insulation materials and further enhances the compactness of the power equipment.

[0022] 5. As a preferred embodiment, this utility model also includes an equalizing ring, which is sleeved around the connection point of adjacent busbars. Through the electric field optimization effect of the equalizing ring, the uniformity of the electric field distribution in the connection area of ​​adjacent busbars can be effectively improved. Preferably, the outer diameter of the equalizing ring gradually decreases from the middle to both ends, forming an arc-shaped curved surface structure with the middle protruding outward on its outer surface. This achieves a smooth transition between the outer surface of the equalizing ring and the outer surface of the adjacent busbar, further reducing electric field distortion and optimizing the electric field distribution characteristics.

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments; however, the busbar and busbar assembly of the present invention are not limited to the embodiments. Attached Figure Description

[0024] Figure 1 This is a three-dimensional structural diagram of the busbar of this utility model. Figure 1 ;

[0025] Figure 2 This is a three-dimensional structural diagram of the busbar of this utility model. Figure 2 ;

[0026] Figure 3 This is a top view of the busbar of this utility model;

[0027] Figure 4 This is a front view of the busbar of this utility model;

[0028] Figure 5 This is a side view of the busbar of this utility model;

[0029] Figure 6 This is an exploded view of the busbar assembly of this utility model;

[0030] Figure 7 yes Figure 6 A magnified view of a portion of the image;

[0031] Figure 8 This is a three-dimensional structural schematic diagram of the equalizing ring of this utility model;

[0032] Figure 9 This is a top view of the equalizing ring of this utility model;

[0033] Figure 10This is a side view of the equalizing ring of this utility model;

[0034] Figure 11 This is an assembly diagram of the busbar assembly of this utility model;

[0035] Figure 12 This is a three-dimensional structural schematic diagram of the busbar assembly of this utility model;

[0036] In the diagram, 1. Busbar; 11. Notch; 12. Partial sidewall; 13. Clearance hole; 2. Busbar plate; 21. Mounting part; 211. Mounting surface; 212. Mounting hole; 3. Bolt; 4. Nut; 5. Equalizing ring; 51. Threaded hole; 6. Set screw. Detailed Implementation

[0037] In this invention, the terms "first," "second," etc., are used only to distinguish similar objects, not to describe a specific order or sequence, nor should they be construed as indicating or implying relative importance. Furthermore, in the description of this invention, unless otherwise stated, "multiple" refers to two or more.

[0038] Please see Figures 1-5 As shown, a busbar according to this utility model includes a hollow busbar tube 1 and a busbar plate 2 disposed within the busbar tube 1. The busbar tube 1 has an axisymmetric or centrosymmetric structure, and the busbar plate 2 has a flat plate structure, with its two surfaces distributed in the thickness direction (i.e., the surfaces containing the length and width of the busbar plate 2) being planar. Both the busbar tube 1 and the busbar plate 2 are made of copper or aluminum and their alloys. The busbar plate 2 extends along the length direction of the busbar tube 1, and its two ends in the width direction are integrally formed with the inner wall surface of the busbar tube 1 to divide the inner cavity of the busbar tube 1 into two independent chambers. At least one end of the busbar plate 2 in the length direction protrudes outside the busbar tube 1 to form a mounting portion 21. This mounting portion 21 is fully exposed on at least one side in the thickness direction of the busbar plate 2, forming a mounting surface 211. Preferably, the mounting surface 211 is planar.

[0039] In a preferred embodiment, a notch 11 is provided on the side wall of the end of the busbar 1 corresponding to the mounting part 21. Specifically, half of the side wall of the end of the busbar 1 corresponding to the mounting part 21 is provided as the notch 11, that is, the notch 11 occupies half of the area of ​​that end side wall. This notch 11 corresponds to one side of the mounting part 21 in the thickness direction of the busbar plate 2, so that one side of the mounting part 21 in the thickness direction of the busbar plate 2 is completely exposed to form a mounting surface 211. The other side of the mounting part 21 in the thickness direction of the busbar plate 2 is covered by the portion of the side wall 12 retained at that end of the busbar 1. The central axis of the busbar 1 is collinear with the center line of the mounting surface 211 in the length direction of the busbar plate 2. Therefore, the surface of the busbar plate 2 where the mounting surface 211 is located constitutes the symmetrical surface of the busbar 1.

[0040] As a preferred embodiment, the installation part 21 is provided with at least one installation hole 212 which penetrates along the thickness direction of the busbar 2 and is matched with a fastener (i.e., the following first fastener) to achieve installation and fixation when the busbars are lapped. The installation hole 212 is a clearance hole, but is not limited thereto. In other embodiments, the installation hole 212 is a threaded hole. The number of installation holes 212 is preferably multiple. In this embodiment, the installation holes 212 are exemplified by two, and the two installation holes 212 are arranged along the width direction of the busbar 2. A part of the side wall 12 reserved at one end of the busbar 1 corresponding to the installation part 21 is provided with a relief hole 13 which corresponds to the installation hole 212 on the installation part 21 and is used to provide relief for the fastener (i.e., the following first fastener). Specifically, in this embodiment, the relief hole 13 is generally waist-shaped and corresponds to the two installation holes 212 at the same time.

[0041] In this embodiment, both ends of the busbar 2 in the length direction are exposed outside the busbar 1 and respectively form installation parts 21; the installation surfaces 211 of the installation parts 21 are on the same side of the busbar 2 in the thickness direction.

[0042] The cross section of the busbar 1 is circular or oval or square, and its cross-sectional shape is matched with that of the busbar 2 to form a "day" shape or a "theta" shape. In this embodiment, the cross section of the busbar 1 is exemplified by being circular. Therefore, the cross-sectional shape of the busbar 1 is matched with that of the busbar 2 to generally form a "theta" shape. Since the cross section of the busbar 1 is circular, the above-mentioned notch 11 is semi-circular, and the part of the side wall 12 reserved at one end of the busbar 1 corresponding to the installation part 21 is also semi-circular.

[0043] A busbar of the present utility model can effectively reduce the skin effect through the hollow design of the busbar 1 and form a heat dissipation channel inside, thereby improving the heat dissipation efficiency. Its busbar 2 can carry part of the current, especially when the busbars are lapped, it can bear the main current path. At the same time, the busbar 2 can be used as the middle stiffening rib of the busbar 1, which can significantly enhance the overall strength and stiffness of the busbar, so that the busbar can withstand a greater support span during laying. In addition, the two surfaces of the busbar 2 in the width direction form ready-made installation and positioning surfaces, which is convenient for the positioning and clamping fixation of the busbar (during implementation, a slot can be opened on the side wall of the busbar to expose the part of the busbar 2 for positioning and clamping); one end or both ends of the busbar 2 are exposed outside the busbar 1 to form an installation part 21, which is convenient for connection and fixation operations when the busbars are lapped, and improves the assembly efficiency.

[0044] Please refer to Figures 1-12As shown, a busbar assembly of this utility model includes multiple busbars as described above. These busbars are arranged sequentially along their length, and adjacent busbars are connected by their respective mounting portions 21, with the mounting surfaces 211 of two connected mounting portions 21 abutting each other. In this embodiment, two busbars are used as an example for illustration, but the number of busbars is not limited to this.

[0045] In this embodiment, the mounting portions 21 of adjacent busbars are connected by a first fastener, which includes a bolt 3 and a nut 4. The bolt 3 passes through mounting holes 212 provided in the mounting portions 21 of the adjacent busbars and is threadedly connected to the nut 4. Since the mounting portion 21 has two mounting holes 212, the mounting portions 21 of adjacent busbars are connected by two first fasteners. In other embodiments, the mounting holes 212 are threaded holes, and the first fastener is a screw.

[0046] In this embodiment, the mounting surfaces 211 of the two connected mounting portions 21 are completely fitted together. Since the mounting portion 21 is shielded on the other side of the busbar plate 2 by the sidewall 12 of the busbar tube 1 at that end, and the sidewall 12 of the busbar tube 1 at that end is semi-circular, after the mounting surfaces 211 of the two adjacent mounting portions 21 are fitted together, the half-sidewalls of the adjacent busbar tubes 1 can be joined together to form a relatively complete sidewall structure. This can effectively improve the uniformity of the electric field distribution at the busbar connection and reduce the risk of local corona discharge.

[0047] In a preferred embodiment, the present invention further includes at least one conductive equalizing ring 5, which is sleeved on the outside of the connection portion of adjacent busbars, with the mounting portions 21 of each adjacent busbar located within the equalizing ring 5. The equalizing ring 5 can also be made of copper or aluminum or their alloys.

[0048] Furthermore, the equalizing ring 5 is connected to at least one of the adjacent busbars using a second fastener. The second fastener is preferably a set screw 6, which is threaded into a threaded hole 51 in the sidewall of the equalizing ring 5, and the tail end of the set screw 6 is inserted into a positioning hole 13 in the sidewall of the busbar tube 1 of the corresponding busbar. Specifically, the positioning hole 13 is located on the portion of the sidewall 12 of the busbar tube 1 that corresponds to the mounting portion 21.

[0049] In a preferred embodiment, the equalizing ring 5 has a circular cross-section and a uniform inner diameter, matching the outer diameter of the busbar 1. The outer diameter of the equalizing ring 5 gradually decreases from its center towards both ends, resulting in an outward-convex arc-shaped surface on its outer side. This reduces the wall thickness at both ends of the equalizing ring 5, allowing for a smoother transition between its outer surface and the adjacent busbar, thereby optimizing the electric field distribution characteristics and further reducing electric field distortion.

[0050] In this utility model, a busbar assembly is assembled by first tightly fitting the mounting surfaces 211 of the mounting portions 21 of adjacent busbars together. Then, a bolt 3 is inserted through the clearance hole 13 of one of the busbar tubes 1, allowing the bolt 3 to pass sequentially through the mounting holes 212 of the two mounting portions 21. Next, a nut 4 is inserted through the clearance hole 13 of the other busbar tube 1, and the nut 4 is threadedly connected to the bolt 3 to achieve a fixed connection between the mounting portions 21 of the adjacent busbars. Then, an equalizing ring 5 is fitted onto the outside of the connection point of the adjacent busbar tubes 1, and finally, a set screw 6 is screwed into the threaded hole 51 of the equalizing ring 5, so that the tail end of the set screw 6 is embedded in the positioning hole 13 of the mounting portion 21, thereby limiting the axial displacement of the equalizing ring 5 along the length of the busbar and ensuring its stable fixation.

[0051] This utility model discloses a busbar assembly that uses a first fastener to connect the mounting portion 21 of adjacent busbars. This not only improves the ease of connection but also allows the first fastener to be housed inside the busbar conduit 1. The shielding effect of the busbar conduit 1 makes the electric field distribution at that location more uniform, thereby reducing the risk of localized electric field concentration. Furthermore, this utility model also uses an equalizing ring 5 as an outer sleeve at the connection point of adjacent busbars. Through the electric field optimization effect of the equalizing ring 5, the uniformity of the electric field distribution in the connection area of ​​adjacent busbars can be effectively improved.

[0052] The present invention relates to a busbar and busbar assembly. The parts not described herein are the same as or can be implemented using existing technologies.

[0053] The above embodiments are only used to further illustrate a busbar and busbar assembly of the present utility model. However, the present utility model is not limited to the embodiments. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall fall within the protection scope of the technical solution of the present utility model.

Claims

1. A busbar, characterized in that: It includes a hollow busbar tube and a busbar plate disposed in the busbar tube. The busbar plate extends along the length direction of the busbar tube, and both ends of the busbar plate in the width direction are integrally formed with the inner wall surface of the busbar tube respectively, so as to divide the inner cavity of the busbar tube into two independent chambers; at least one end of the busbar plate in the length direction is exposed outside the busbar tube to form an installation part, and at least one side of the installation part in the thickness direction of the busbar plate is exposed to form an installation surface.

2. The busbar according to claim 1, characterized in that: One end side wall of the busbar tube corresponding to the installation part is provided with a notch, which occupies half of the area of the end side wall of the busbar tube, and the notch corresponds to one side of the installation part in the thickness direction of the busbar plate, so that one side of the installation part in the thickness direction of the busbar plate is completely exposed; the other side of the installation part in the thickness direction of the busbar plate is blocked by the remaining part of the side wall of the busbar tube at this end; the central axis of the busbar tube is collinear with the center line of the installation surface in the length direction of the busbar plate.

3. The busbar according to claim 1, characterized in that: The installation part is provided with at least one installation hole, and the installation hole penetrates along the thickness direction of the busbar plate.

4. The busbar according to claim 2, characterized in that: The installation part is provided with at least one installation hole, and the installation hole penetrates along the thickness direction of the busbar plate; the remaining part of the side wall of the busbar tube corresponding to the installation part is provided with a relief hole, and the relief hole corresponds to the at least one installation hole.

5. The busbar according to any one of claims 1-4, characterized in that: Both ends of the busbar plate in the length direction are respectively exposed outside the busbar tube and respectively form the installation parts; the installation surfaces of each installation part are located on the same side of the busbar plate in the thickness direction.

6. The busbar according to claim 1, characterized in that: The cross section of the busbar tube is circular or elliptical or square, and its cross section shape matches with that of the busbar plate to form a shape like a Chinese character 'Ri' or a shape like 'Θ'; the busbar plate is a flat plate, and the installation surface is a plane.

7. A busbar assembly, characterized in that: It includes a plurality of busbars as described in any one of claims 1-6. The plurality of busbars are arranged in sequence along the length direction of the busbar, and adjacent busbars are connected through their respective installation parts, and the installation surfaces of the two connected installation parts are abutted against each other.

8. The busbar assembly according to claim 7, characterized in that: The respective installation parts of the adjacent busbars are connected by a first fastener. The first fastener includes a bolt and a nut. The screw rod of the bolt sequentially passes through the installation holes provided in the respective installation parts of the adjacent busbars and is threadedly connected with the nut; the installation surfaces of the two connected installation parts are abutted against each other.

9. The busbar assembly according to claim 8, characterized in that: It further includes at least one conductive grading ring, and the grading ring is sleeved outside the connection part of the adjacent busbars.

10. The busbar assembly according to claim 9, characterized in that: The grading ring is connected to at least one of the adjacent busbars by a second fastener; the second fastener is a set screw, and the set screw is threadedly connected with a threaded hole provided on the side wall of the grading ring, and the tail end of the set screw is inserted into a positioning hole provided on the side wall of the busbar tube of the corresponding busbar; the respective installation parts of the adjacent busbars are both located within the grading ring.

11. The busbar assembly according to claim 9 or 10, characterized in that: The cross section of the busbar tube is circular, the cross section of the grading ring is circular, the inner diameters of the grading rings are equal in diameter, and the outer diameter of the grading ring gradually decreases from the middle to both ends, so that the outer side surface of the grading ring is an arc-shaped curved surface protruding outward in the middle.

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