Flexible pipe type busbar connection device

Abstract

A flexible pipe type bus connecting device, comprising a sleeve mounting seat, a pipe bus clamp assembly and a support conductive wire, the sleeve mounting seat is arranged opposite to the pipe bus clamp assembly, the pipe bus clamp assembly comprises a first detachable connection circular arc pipe clamp and a second circular arc pipe clamp, the support conductive wire comprises a first cable core and a second cable core in a semicircular arc shape, the first cable core and the second cable core are arranged oppositely to form a circular connection structure, the first circular arc pipe clamp is connected with the sleeve mounting seat through the first cable core, the second circular arc pipe clamp is connected with the sleeve mounting seat through the second cable core, the support conductive wire can not only conduct electricity, but also effectively absorb manufacturing tolerance and installation error through the formed circular connection structure, avoid stress concentration, realize flexible connection, and the connection mode is reliable, the installation efficiency is high, the on-site maintenance and replacement are convenient, the structure is simple, no additional insulation coating is needed, ventilation and heat dissipation are convenient, and high temperature working conditions are adapted.

Description

Technical Field

[0001] This utility model relates to the field of high-voltage electrical equipment, and in particular to a flexible tubular busbar connection device. Background Technology

[0002] With the increasing complexity and scale of power systems, the performance requirements for connection structures on the high-voltage (e.g., 220kV) and medium-voltage (e.g., 35kV) sides of substation main transformers are continuously rising. The bushings of the main transformer need to be reliably connected to the tubular busbars. This connection device must not only meet conductivity requirements but also possess good mechanical adaptability, flexible compensation capabilities, and long-term operational stability. Traditional designs commonly employ rigid connection structures, such as direct copper busbar connections, flange bolt fixing, or welding. These rigid structures require high manufacturing precision and installation alignment during construction, making them difficult to accommodate dimensional deviations and installation errors present in actual field conditions. This can easily lead to stress concentration, affecting equipment sealing, insulation, and service life, and even causing safety hazards.

[0003] To address these issues, some existing technologies have begun to explore flexible connection structures. For example, Chinese patent CN106505500A discloses a bushing busbar connection device, which consists of multiple arc-shaped copper sheets, two metal connectors, and an elastic clamp. While this solution achieves a degree of flexibility, its complex structure, cumbersome assembly process, and high requirements for on-site installation quality, coupled with the failure to effectively mitigate the risk of clamp loosening under stress during operation, make it problematic. Furthermore, its flexible design primarily relies on localized connection displacement compensation, limiting its overall adaptability to axial, radial, and angular errors, making it particularly unsuitable for long-term operation under high voltage and high current conditions.

[0004] Chinese patent CN211456620U discloses a flexible tubular busbar connection device that uses an elastic rubber cone as a transition component to alleviate alignment errors. However, this structure relies on non-metallic materials such as rubber to bear the critical stress and connection functions, resulting in problems such as poor conductivity, rapid thermal aging, and insufficient strength. It is unsuitable for high-current, high-stress conditions at voltage levels of 230kV and 34.5kV. While its flexible connection concept is worth learning from, it still has technical shortcomings in terms of reliability and applicable voltage levels. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the shortcomings of the existing technology and provide a flexible tubular busbar connection device that is simple in structure and easy to install and maintain.

[0006] The technical solution adopted by this utility model to solve its technical problem is: a flexible tubular busbar connection device, including a sleeve mounting base, a busbar clamp assembly, and a supporting conductive wire. The sleeve mounting base and the busbar clamp assembly are arranged opposite to each other. The busbar clamp assembly includes a first arc-shaped pipe clamp and a second arc-shaped pipe clamp that can be detachably connected. The supporting conductive wire includes a first cable core and a second cable core that are semi-circular in shape. The first cable core and the second cable core are arranged vertically opposite to each other to form a circular connection structure. The first arc-shaped pipe clamp is connected to the sleeve mounting base through the first cable core, and the second arc-shaped pipe clamp is connected to the sleeve mounting base through the second cable core. The first cable core and the second cable core are conductive and allow relative displacement at both ends, thereby achieving a flexible connection.

[0007] Furthermore, the sleeve mounting base has a sleeve limiting part on the side near the sleeve clamp assembly, which is used to limit the position of the sleeve.

[0008] Furthermore, the side of the sleeve mounting base away from the pipe clamp assembly has an L-shaped connection part, which facilitates connection with the sleeve.

[0009] Furthermore, the number of the first cable core and the second cable core is at least two, and the multiple first cable cores are arranged horizontally and the multiple second cable cores are arranged horizontally, which can ensure that the first cable cores and the second cable cores will not deform horizontally and increase the strength in the horizontal direction.

[0010] Furthermore, the supporting conductive wire is an aluminum stranded wire that has undergone T5 heat treatment.

[0011] Furthermore, the first cable core and the second cable core are provided with expansion sleeves, which are located inside the first cable core and the second cable core. The expansion sleeves are used to provide structural rigidity, protect the cable core from external force damage, and allow a certain range of axial displacement to cope with thermal expansion caused by temperature rise.

[0012] Furthermore, the first and second arc pipe clamps are detachably connected by bolts. The bolt connection method is reliable, has high installation efficiency, and is convenient for on-site maintenance and replacement.

[0013] The beneficial effects of this utility model are as follows: This utility model adopts a supporting conductive wire, which not only conducts electricity, but its circular connection structure can effectively absorb manufacturing tolerances and installation errors, avoid stress concentration, realize flexible connection, and the connection method is reliable, with high installation efficiency, convenient on-site maintenance and replacement, simple structure, no need for additional insulation covering, convenient ventilation and heat dissipation, and suitable for high temperature working conditions. Attached Figure Description

[0014] Figure 1 —A schematic diagram of the structure of this utility model;

[0015] Figure 2 —Three views of this utility model;

[0016] In the figure: 1-sleeve mounting base, 11-pipe female limiting part, 12-L-shaped connection part, 2-pipe female clamp assembly, 21-first arc pipe clamp, 22-second arc pipe clamp, 3-supporting conductive wire, 31-first cable core, 32-second cable core. Detailed Implementation

[0017] Reference Figures 1-2 A flexible tubular busbar connection device includes a sleeve mounting base 1, a busbar clamp assembly 2, and a supporting conductive wire 3. The sleeve mounting base 1 and the busbar clamp assembly 2 are arranged opposite to each other. The busbar clamp assembly 2 includes a first arc-shaped clamp 21 and a second arc-shaped clamp 22 that are detachably connected. The supporting conductive wire 3 includes a first cable core 31 and a second cable core 32 that are semi-circular in shape. The first cable core 31 and the second cable core 32 are arranged vertically opposite to each other to form a circular connection structure. The first arc-shaped clamp 21 is connected to the sleeve mounting base 1 through the first cable core 31, and the second arc-shaped clamp 22 is connected to the sleeve mounting base 1 through the second cable core 32. The first cable core 31 and the second cable core 32 are conductive and allow relative displacement at both ends, thus achieving a flexible connection.

[0018] The sleeve mounting base 1 has a pipe busbar limiting part 11 on the side near the pipe busbar clamp assembly 2, which is used to limit the position of the pipe busbar; the side of the sleeve mounting base 1 away from the pipe busbar clamp assembly 2 has an L-shaped connecting part 12, which is convenient for connecting with the sleeve. The L-shaped connecting part 12 is connected to the sleeve by bolts.

[0019] The number of first cable cores 31 and second cable cores 32 is at least two, and the multiple first cable cores 31 and multiple second cable cores 32 are arranged horizontally. The multiple cable cores arranged horizontally can increase the horizontal width, thereby increasing the horizontal strength and ensuring that the first cable cores 31 and second cable cores 32 will not deform horizontally. The number in the figure is two. In other embodiments, the number can also be three, four, etc. The number of first cable cores 31 and second cable cores 32 should be equal.

[0020] The supporting conductive wire 3 is made of aluminum stranded wire, such as CA 636 MCM, and is heat treated with T5 type. It is about 1000mm long and has good conductivity, current carrying capacity, flexibility and mechanical properties, allowing the component to adapt to multi-directional displacement during installation.

[0021] Expansion sleeves are provided on the first cable core 31 and the second cable core 32. The expansion sleeves are located inside the first cable core 31 and the second cable core 32 to provide structural rigidity, protect the cable cores from external damage, and allow a certain range of axial displacement to cope with thermal expansion caused by temperature rise.

[0022] The first arc pipe clamp 21 and the second arc pipe clamp 22 are detachably connected by bolts. The bolt connection method is reliable, has high installation efficiency, and is convenient for on-site maintenance and replacement. Stainless steel bolts (austenitic stainless steel AISI 304) are used for bolting and installation, which conforms to the NEMA 4-hole standard interface, ensuring the structural compatibility and interchangeability of the connection between the sleeve mounting seat 1 and the pipe clamp assembly 2.

[0023] To ensure long-term reliable electrical contact between the flexible cable core and the conduit clamp assembly 2, the cable core must first undergo T5 heat treatment. The ends of the cable core are then cold-pressed to the sleeve mounting base 1 and the conduit clamp assembly 2 using a specialized crimping tool, ensuring connection strength, low impedance performance, and good electrical continuity. All bolts are made of AISI 304 stainless steel, providing excellent corrosion resistance and mechanical strength.

[0024] The working principle and usage of this utility model: This utility model uses a fully bolted connection structure for installation, eliminating the need for external welding or insulation. After all components are pre-assembled, the bushing mounting base 1 is fixed to the transformer bushing on-site, and the busbar is fixed to the busbar clamp assembly 2. This significantly simplifies on-site installation, improves efficiency, and reduces operational risks. Simultaneously, because the supporting conductive wire 3 can accommodate minor displacements caused by system thermal expansion and contraction, it avoids stress concentration and loosening of connections in rigid busbar structures due to temperature differences, thus improving operational reliability.

[0025] This embodiment successfully achieves a flexible connection between the transformer and the busbar system by using a combination of bushing mounting base 1, busbar clamp assembly 2, and supporting conductive wire 3. It has the following outstanding features: convenient installation, reliable connection, excellent conductivity, and strong resistance to thermal expansion. It can be widely used in the medium and high voltage outgoing line systems of transformers in new energy power plants such as photovoltaic and wind power plants.

[0026] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A flexible tubular busbar connection device, characterized in that: The device includes a sleeve mounting base (1), a pipe clamp assembly (2), and a supporting conductive wire (3). The sleeve mounting base (1) and the pipe clamp assembly (2) are arranged opposite to each other. The pipe clamp assembly (2) includes a first arc pipe clamp (21) and a second arc pipe clamp (22) that can be detachably connected. The supporting conductive wire (3) includes a first cable core (31) and a second cable core (32) that are semi-circular. The first cable core (31) and the second cable core (32) are arranged vertically opposite to each other to form a circular connection structure. The first arc pipe clamp (21) is connected to the sleeve mounting base (1) through the first cable core (31), and the second arc pipe clamp (22) is connected to the sleeve mounting base (1) through the second cable core (32).

2. The flexible tubular busbar connection device according to claim 1, characterized in that: The sleeve mounting base (1) has a pipe nut limiting part (11) on the side near the pipe nut clamp assembly (2).

3. A flexible pipe type busbar connection device according to claim 1, characterized in that: The sleeve mounting base (1) has an L-shaped connection part (12) on the side away from the pipe clamp assembly (2).

4. A flexible pipe type busbar connection device according to claim 1, characterized in that: The number of the first cable core (31) and the second cable core (32) is at least two, and the multiple first cable cores (31) are arranged horizontally and the multiple second cable cores (32) are arranged horizontally.

5. A flexible pipe type busbar connection device according to claim 1, characterized in that: The supporting conductive wire (3) is an aluminum stranded wire that has undergone T5 heat treatment.

6. A flexible pipe type busbar connection device according to any one of claims 1 to 5, characterized in that: The first cable core (31) and the second cable core (32) are provided with expansion sleeves.

7. A flexible pipe type busbar connection device according to any one of claims 1 to 5, characterized in that: The first arc pipe clamp (21) and the second arc pipe clamp (22) are detachably connected by bolts.

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