Busbar assembly and gas insulated apparatus

Abstract

The utility model relates to busbar assembly and gas insulation equipment, busbar assembly includes: pipeline shell, insulator, the insulator is supported in the inner wall of pipeline shell, and the center of insulator is provided with the metal insert of tubular, the metal insert is provided with the first through -hole through its wall, conducting rod, the conducting rod passes through the metal insert axially, and is provided with the recess with the first through -hole radial alignment, and pin, the pin passes through the first through -hole and is located in the recess with shape mutual match, and the pin is provided with the second through -hole to be detachably connected to the conducting rod through the fastener of second through -hole, according to the utility model busbar assembly has good structural stability, will not loosen, and can realize repeated dismounting.

Description

Technical Field

[0001] This utility model relates to the field of design and manufacturing technology of gas-insulated equipment. More specifically, this utility model relates to a busbar assembly for gas-insulated equipment, and to gas-insulated equipment including such a busbar assembly. Background Technology

[0002] In the field of high-voltage circuits or power systems, GIS (Gas-Insulated Switchgear), GIB (Gas-Insulated Busbar), and GIL (Gas-Insulated Transmission Line) are key equipment related to gas insulation technology, mainly used in high-voltage (HV), ultra-high-voltage (EHV), or extra-high-voltage (UHV) transmission systems.

[0003] Taking GIL as an example, GIL is a high-current power transmission device that uses gas insulation. Its busbar segment generally consists of multiple busbar units connected in sequence, so the line is relatively long. The main structure of the GIL busbar segment is a cylindrical conductive rod (i.e., the transmission busbar) set in the center of a closed pipe filled with insulating gas. The conductive rod is supported by insulators (usually three-post insulators) between the conductive rod and the pipe shell. A metal insert is set in the center of the insulator for the conductive rod to pass through.

[0004] To prevent relative displacement between the insulator and the conductor rod due to vibration or other factors, a metal insert in the insulator is typically fixedly connected to the conductor rod. In existing technologies, this is usually achieved through welding or mechanical necking. For welding, special measures are required to reduce the risk of weld spatter on the insulator surface or the inner wall of the pipe casing. For mechanical necking, complex specialized tools are needed to rigidly connect the conductor rod to the metal insert. Furthermore, assemblies formed by these methods are not removable; replacing the insulator would damage the welded or mechanical connection structure. Utility Model Content

[0005] The purpose of this invention is to provide a busbar assembly for gas-insulated equipment to overcome at least one deficiency in the prior art. More specifically, the busbar assembly according to this invention has good structural stability, will not loosen, and can be repeatedly disassembled.

[0006] To this end, a first aspect of the present invention provides a busbar assembly, the busbar assembly comprising: a pipe housing; an insulator supported on the inner wall of the pipe housing, wherein a cylindrical metal insert is disposed at the center of the insulator, the metal insert having a first through hole penetrating its wall; a conductive rod axially passing through the metal insert and having a recess radially aligned with the first through hole; and a pin passing through the first through hole and positioned in the recess in a matching shape, the pin having a second through hole for detachably connecting to the conductive rod by a fastener passing through the second through hole.

[0007] Therefore, according to this utility model, the relative movement of the insulator and the conductive rod is restricted by the setting of the pin, which improves the structural stability and avoids the fasteners from loosening or breaking; in addition, the detachable structure allows for easy replacement of the insulator without damaging the structure of the conductive rod.

[0008] Based on the above technical concept, the present invention may further include any one or more of the following optional forms.

[0009] In some alternative configurations, the busbar assembly further includes an annular wedge made of a non-metallic material, positioned adjacent to the end of the metal insert and sandwiched between the metal insert and the conductive rod. The annular wedge effectively fills the gap between the metal insert and the conductive rod, further enhancing the overall structural stability.

[0010] In some alternative forms, the wedge has an inclined surface that is tilted relative to the axial direction of the conductive rod, and the angle between the inclined surface and the axial direction of the conductive rod is between 5° and 15°.

[0011] In some alternative forms, the wedge is interference-fitted with the metal insert and / or the conductive rod.

[0012] In some alternative forms, the busbar assembly further includes an annular metal baffle fixedly connected to the end face of the metal insert and preventing the wedge from sliding out of the metal insert.

[0013] In some alternative forms, the fastener is a bolt.

[0014] In some alternative forms, the busbar assembly further includes a bushing embedded in the first through-hole, the bushing being made of a non-metallic material and sandwiched between the metal insert and the pin.

[0015] In some alternative forms, the busbar assembly further includes an equipotential bonding element that electrically connects the metal insert to the conductive rod.

[0016] A second aspect of this invention provides a gas-insulated device, including a busbar assembly according to a first aspect of this invention.

[0017] In some alternative forms, the gas-insulated device is a gas-insulated switchgear, a gas-insulated busbar, or a gas-insulated transmission line. Attached Figure Description

[0018] Other features and advantages of this invention will be better understood through the following detailed description of preferred embodiments in conjunction with the accompanying drawings, in which the same reference numerals denote the same or similar parts.

[0019] Figure 1 This is a cross-sectional structural schematic diagram of one embodiment of the busbar assembly according to the present invention.

[0020] Figure 2 yes Figure 1 An enlarged view of region A in the image.

[0021] Figure 3 This is a partial schematic diagram of the busbar assembly at the location of the equipotential connector.

[0022] Figure 4 This is a cross-sectional structural diagram of a busbar assembly used for comparison and reference.

[0023] Figure 5 yes Figure 4 A magnified view of region B in the image.

[0024] The elements in the accompanying drawings are shown for simplicity and clarity and are not necessarily drawn to exact scale. It should be understood that these drawings are not only for explaining and illustrating the present invention, but also, where necessary, for defining the present invention. Detailed Implementation

[0025] The implementation and use of the embodiments are discussed in detail below. However, it should be understood that the specific embodiments discussed are merely illustrative of particular ways of implementing and using this utility model, and are not intended to limit the scope of protection of this utility model.

[0026] In this specification, unless otherwise expressly specified and limited, the axial (i.e., X-direction shown) and radial (i.e., Y-direction shown) directions are defined according to the axial and radial directions of the busbar assembly’s conduit housing, conductive rod, and metal inserts.

[0027] It is understood that the busbar assembly according to this utility model is applied to gas-insulated equipment in the field of high-voltage circuits or power systems, including but not limited to GIS (Gas Insulated Switchgear), GIB (Gas Insulated Busbar) and GIL (Gas Insulated Transmission Line).

[0028] The following uses Figures 1 to 3 This invention describes a preferred embodiment of a busbar assembly according to the present invention, such as a busbar assembly used in GIL.

[0029] like Figure 1 and Figure 2 As shown, the busbar assembly according to this utility model includes a pipe housing 100, a conductive rod 200, and an insulator 300. The pipe housing 100 is a closed structure with a large extension length and is filled with insulating gas. The inner wall of the pipe housing 100 is provided with a particle trapping device 110, for example. The conductive rod 200 is supported by the insulator 300 and extends to the center of the pipe housing 100. More specifically, the insulator 300 is, for example, a three-post insulator, and is supported by the end of each post on the inner wall of the pipe housing 100. A cylindrical metal insert 400 is provided at the center of the insulator 300, through which the conductive rod 200 passes axially and is supported by the metal insert 400.

[0030] As mentioned earlier, to prevent relative displacement between the insulator 300 and the conductive rod 200 due to vibration or other reasons, the metal insert 400 needs to be fixedly connected to the conductive rod 200. Therefore, according to this invention, the metal insert 400 is provided with a first through hole 410 penetrating its wall. Preferably, a bushing 700 is embedded within the first through hole 410. The bushing 700 is made of a non-metallic material, such as PEEK (polyether ether ketone) with added glass fiber, or it can be replaced by a high-strength plastic bearing resistant to high temperatures. The conductive rod 200 is provided with a recess 210 radially aligned with the first through hole 410, and a connecting hole 220 penetrating its wall and communicating with the recess 210. Thus, the recess 210 and the connecting hole 220 together form the stepped hole shown. The busbar assembly also includes a pin 600 that mates with the shape of the recess 210. The pin 600 passes radially through the first through-hole 410 and is fixedly positioned in the recess 210, allowing the bushing 700 to be tightly clamped between the metal insert 400 and the pin 600 within the first through-hole 410. The pin 600 is provided with a second through-hole 610 (e.g., a stepped hole as shown) to allow for detachable connection to the conductive rod 200 via a fastener passing through the second through-hole 610 and the connecting hole 220, such as a first bolt 810. Furthermore, in the illustrated embodiment, the metal insert 400 is also provided with a third through-hole 420 penetrating its wall, allowing the shield 900 to be securely connected to the metal insert 400 via a second bolt 820 passing through the third through-hole 420.

[0031] Therefore, by providing a non-metallic bushing 700 between the metal insert 400 and the pin 600, metal particles can be avoided from being generated due to relative friction between the metal insert 400 and the pin 600 during assembly, transportation, and use. Furthermore, the pin 600 acts as a load-bearing component during assembly, transportation, and use, restricting the relative movement of the insulator 300 and the conductive rod 200, thus improving structural stability, preventing loosening or breakage of fasteners, and allowing for repeated disassembly without damaging the conductive rod 200 when replacing the insulator 300.

[0032] Furthermore, due to manufacturing tolerances and other reasons, a radial gap G exists between the metal insert 400 and the conductive rod 200, which may affect the structural stability. Therefore, according to a preferred embodiment of the present invention, the busbar assembly further includes an annular wedge 500, which is made of a non-metallic material, such as PTFE (polytetrafluoroethylene, also known as Teflon) with added solid lubricant (e.g., MoS2). The wedge 500 is disposed adjacent to the end of the metal insert 400 and is tightly clamped between the metal insert 400 and the conductive rod 200 to fill the gap G. More specifically, the wedge 500 has an inclined surface 510 that is inclined relative to the axial direction X of the conductive rod 200 and abuts against the inner wall of the metal insert 400. The angle between the inclined surface 510 and the axial direction X of the conductive rod 200 is preferably between 5° and 15°, for example, about 9°. According to a preferred, but not limiting, embodiment, the wedge 500 is configured to interference fit with the metal insert 400 and / or the conductive rod 200. Furthermore, the busbar assembly may also include an annular metal baffle 430, which is fixedly connected to the end face of the metal insert 400 by fasteners (e.g., a plurality of screws 860) and prevents the wedge 500 from axially sliding out of the metal insert 400; that is, the inner diameter of the metal baffle 430 is smaller than the maximum outer diameter of the wedge 500.

[0033] Thus, by setting the wedge-shaped part 500, the radial gap G between the metal insert 400 and the conductive rod 200 is effectively filled, further improving the overall structural stability of the busbar assembly.

[0034] Furthermore, since both the bushing 700 and the wedge 500 are made of non-metallic materials, the busbar assembly preferably also includes an equipotential bonding element, such as a connecting wire 850, to electrically connect the metal insert 400 to the conductive rod 200, in order to avoid the risk of partial discharge due to an induced potential difference on the metal insert 400. More specifically, as Figure 2 and Figure 3As shown, the conductive rod 200 has a fourth through hole 230 penetrating its wall. One end of the connecting wire 850 is electrically connected to the conductive rod 200 via a third bolt 830 tightened in the fourth through hole 230, and the other end of the connecting wire 850 is electrically connected to the metal insert 400 via a fourth bolt 840 tightened on the metal baffle 430. It is understood that the construction of the equipotential bonding member is not limiting; any suitable construction can be chosen for electrically connecting the metal insert 400 to the conductive rod 200. For example, the connecting wire 850 can be replaced by placing a metal pin between the metal insert 400 and the conductive rod 200.

[0035] Figure 4 and Figure 5 A busbar assembly for comparison reference is shown. For example... Figure 4 and Figure 5 As shown, compared with the above embodiment of the present invention, the busbar component does not include the wedge-shaped part 500 and the pin 600. That is, the metal insert 400 is provided with a first through hole 410 penetrating its wall, and the conductive rod 200 is provided with a connecting hole 220 radially aligned with the first through hole 410. The metal insert 400 is directly connected to the conductive rod 200 by a first bolt 810 passing through the first through hole 410 and the connecting hole 220.

[0036] Although Figure 4 and Figure 5 The busbar assembly shown also has a detachable structure, but compared with the solution of this utility model, its drawback is that, due to the inability to compensate for the radial gap between the metal insert 400 and the conductive rod 200, the overall structural stability is poor. Furthermore, because the first bolt 810 connecting the metal insert 400 to the conductive rod 200 bears significant stress as a load-bearing component during assembly, transportation, and use, the axial component of this stress can easily cause the first bolt 810 to loosen or break. Therefore, the solution of this utility model is clearly superior. Figure 4 and Figure 5 The scheme shown is as follows.

[0037] The technical content and features of this utility model have been disclosed above. However, it is understood that under the creative concept of this utility model, those skilled in the art can make various changes and improvements to the above-disclosed concept, but all of them fall within the protection scope of this utility model.

[0038] The above description of the embodiments is illustrative and not restrictive, and the scope of protection of this utility model is determined by the claims.

Claims

1. A busbar assembly, characterized in that, include: Pipe shell (100); An insulator (300) is supported on the inner wall of the pipe housing (100), and a cylindrical metal insert (400) is provided at the center of the insulator (300), the metal insert (400) being provided with a first through hole (410) penetrating its wall; A conductive rod (200) axially passes through the metal insert (400) and is provided with a recess (210) radially aligned with the first through hole (410); and A pin (600) passes through the first through hole (410) and is shaped to be positioned in the recess (210), and the pin (600) is provided with a second through hole (610) to be detachably connected to the conductive rod (200) by a fastener passing through the second through hole (610).

2. The busbar assembly according to claim 1, characterized in that, The busbar assembly also includes an annular wedge (500) made of non-metallic material, the wedge (500) being disposed adjacent to the end of the metal insert (400) and sandwiched between the metal insert (400) and the conductive rod (200).

3. The busbar assembly according to claim 2, characterized in that, The wedge (500) has an inclined surface (510) that is inclined relative to the axial direction (X) of the conductive rod (200), and the angle between the inclined surface (510) and the axial direction (X) of the conductive rod (200) is between 5° and 15°.

4. The busbar assembly according to claim 2, characterized in that, The wedge (500) is interference-fitted with the metal insert (400) and / or with the conductive rod (200).

5. The busbar assembly according to claim 2, characterized in that, The busbar assembly also includes an annular metal baffle (430), which is fixedly connected to the end face of the metal insert (400) and prevents the wedge (500) from sliding out of the metal insert (400).

6. The busbar assembly according to any one of claims 1 to 5, characterized in that, The fastener is a bolt.

7. The busbar assembly according to any one of claims 1 to 5, characterized in that, The busbar assembly also includes a bushing (700) embedded in the first through hole (410), the bushing (700) being made of a non-metallic material and sandwiched between the metal insert (400) and the pin (600).

8. The busbar assembly according to any one of claims 1 to 5, characterized in that, The busbar assembly also includes an equipotential bonding member that electrically connects the metal insert (400) to the conductive rod (200).

9. A gas-insulating device, characterized in that, Includes the busbar assembly according to any one of claims 1 to 8.

10. The gas insulation device according to claim 9, characterized in that, The gas-insulated equipment is a gas-insulated switchgear, a gas-insulated busbar, or a gas-insulated transmission line.

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