Capacitor bank and wiring assembly thereof

Abstract

The utility model relates to a capacitor bank and a wiring assembly thereof. The capacitor bank comprises a plurality of capacitors and a tubular bus bar, the wiring assembly comprises a busbar which extends lengthwise and is provided with a first end and a second end which are opposite in the lengthwise direction, and the first end is suitable for being detachably connected to the tubular bus bar; the wire clamp is detachably connected to the second end of the busbar, the wire clamp is provided with a sleeve and a connecting plate, the sleeve is suitable for being connected with a flexible wire of the capacitor in a sleeved mode, the connecting plate is connected to the sleeve and attached to the busbar, and the connecting plate is provided with a plurality of connecting through holes formed in the lengthwise direction.

Description

Technical Field

[0001] The utility model relates to the technical field of capacitor sets for electric power equipment, in particular to a capacitor bank and a wiring assembly thereof. Background Art

[0002] Capacitor banks are an important part of UHV DC or AC transmission and transformation projects. Whether they can work properly directly affects the safe operation of UHV power grids. Therefore, the inlet and outlet matching technology of capacitor banks has always attracted people's attention. Currently, the main known methods of connecting the inlet and outlet of capacitor banks are as follows:

[0003] One is to directly use the Hafu (Hafu) wire clamp for connection. The Hafu wire clamp is a clamp that connects two semi-ring-shaped objects into a circular ring. The Hafu wire clamp can directly connect the soft stranded wire of the capacitor to the tube busbar. After power is turned on, the soft stranded wire will shrink under the action of electric force. After running for a period of time, the connection between the Hafu wire clamp and the soft stranded wire will become loose, resulting in an increase in the connection resistance, causing the soft stranded wire to heat up, oxidize, and even burn.

[0004] The other method is to connect the capacitor's soft stranded wire to the tubular busbar through a single-hole wire clamp. Since the contact area between the wire clamp and the terminal of the tubular busbar is small, this connection method is difficult to meet the DC resistance requirement of 20μΩ in the national grid acceptance specification and cannot be applied to large current capacitor banks.

[0005] Another method is to directly connect the capacitor's soft stranded wire to the busbar terminal. However, if the distance from the terminal to the capacitor terminal is long, this connection method will cause the soft stranded wire to sag or swing in the wind, which can easily cause the insulation distance to decrease and lead to safety accidents such as short circuits.

[0006] Therefore, there is a certain demand in the industry to improve the connection method of the input and output lines of the capacitor group to meet the requirements of safe production. Utility Model Content

[0007] The utility model aims to provide a wiring assembly for a capacitor bank, which can at least solve some of the above technical problems.

[0008] The utility model also aims to provide a capacitor group using the improved wiring assembly.

[0009] According to one aspect of the utility model, there is provided a wiring assembly for a capacitor group, the capacitor group comprising a plurality of capacitors and a tubular busbar, the wiring assembly comprising: a busbar extending longitudinally and having a first end and a second end opposite to each other in the longitudinal direction, wherein the first end is suitable for being detachably connected to the tubular busbar; a wire clamp detachably connected to the second end of the busbar, the wire clamp having a sleeve suitable for sleeve-fitting a soft wire of the capacitor and a connecting plate connected to the sleeve and abutting against the busbar, wherein the connecting plate has a plurality of connecting through holes arranged along the longitudinal direction.

[0010] The wiring assembly provided by this scheme is suitable for providing a stable and safe connection between the soft wire of the capacitor and the connecting terminal of the tubular busbar. The long busbar allows the capacitor to be electrically connected to the tubular busbar with a shorter soft wire. The advantage of the short soft wire connection is that it will not bend or sag, thus avoiding the reduction of insulation distance due to sagging and bending of the soft wire that is too long and other safety accidents caused by it. In addition, the multiple connecting through holes arranged along the longitudinal direction of the busbar increase the contact area of ​​the connecting plate with the busbar, thereby reducing the contact resistance between the two. When the wiring assembly of this scheme is adopted, the connection between the soft stranded wire of the capacitor and the wire clamp will not loosen after power is turned on, preventing the soft wire from heating locally and burning. At the same time, it can meet the requirements of the State Grid acceptance specification for a DC resistance of 20μΩ, making this connection scheme suitable for large current capacitor groups.

[0011] The wiring assembly of this solution is particularly suitable for connecting the incoming and outgoing lines of capacitor groups in ultra-high voltage transmission and transformation power grids, such as ultra-high voltage DC capacitor groups, ultra-high voltage AC capacitor groups, ultra-high voltage series capacitor groups, etc.

[0012] In some embodiments, the connecting plate has a pair of connecting through holes arranged along the longitudinal direction.

[0013] In some embodiments, the busbar has a substrate of a first conductive material, the connecting terminal of the busbar has a plate segment of a second conductive material, a transition plate is arranged on the side of the substrate, and the transition plate includes a first layer of the first conductive material and a second layer of the second conductive material, wherein the first layer is attached to the substrate, and the second layer is suitable for attaching to the plate segment of the connecting terminal.

[0014] In some embodiments, the busbar has a surface treatment layer applied to at least a portion of the surface of the substrate.

[0015] In some embodiments, the busbar and the transition plate are adapted to be detachably connected to the plate section of the connection terminal via a same connection piece.

[0016] In some embodiments, the busbar is configured as a rectangular long strip and has connecting through holes at the first end and the second end respectively.

[0017] In some embodiments, the wire clamp is pre-cooled and connected to the flexible wire of the capacitor at the factory.

[0018] In some embodiments, two wire clips are arranged side by side at the second end of the busbar perpendicular to the longitudinal direction.

[0019] In some embodiments, the flexible wire of the capacitor and the connecting terminals of the tubular bus are respectively connected to two opposite sides of the busbar.

[0020] According to another aspect of the utility model, a capacitor bank is provided, comprising: a tubular busbar having a connecting terminal; a plurality of capacitors, each of which is connected to a flexible conductor; a wiring assembly connected between the connecting terminal of the tubular busbar and the flexible conductor of the capacitor; wherein the wiring assembly is the aforementioned wiring assembly, wherein the connecting terminal of the tubular busbar is connected to the first end of the busbar of the wiring assembly, and the wire clamp of the wiring assembly is connected to the flexible conductor of the capacitor at the second end of the busbar.

[0021] Some of the other features and advantages of the present invention will be apparent to those skilled in the art after reading this application, and the other parts will be described in the following specific embodiments in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The embodiments of the present invention are described in detail below with reference to the accompanying drawings, wherein:

[0023] Figure 1 is a schematic diagram of a wiring assembly according to a first embodiment of the utility model;

[0024] Figure 2 is an exploded schematic diagram of a wiring assembly according to a first embodiment of the utility model;

[0025] Figure 3 is a schematic diagram of a wiring assembly according to a second embodiment of the utility model;

[0026] Figure 4 It is an exploded schematic diagram of a wiring assembly according to a second embodiment of the utility model.

[0027] Description of reference numerals:

[0028] 1-busbar; 2-connection terminal; 21-clamping part; 22-plate section; 3-flexible wire; 4-connection

[0029] Component; 41-busbar; 411-first end; 412-second end; 413-through hole; 414-through

[0030] hole; 42-transition plate; 421-first layer; 422-second layer; 423-through hole; 43-clip;

[0031] 431-sleeve; 432-connecting plate; 433-through hole; 5-bolt; 6-bolt DETAILED DESCRIPTION

[0032] Now, with reference to the accompanying drawings, the schematic scheme of the capacitor bank and its wiring assembly disclosed by the utility model is described in detail. Although the accompanying drawings are provided to present some embodiments of the utility model, the accompanying drawings do not have to be drawn according to the size of the specific implementation scheme, and certain features may be enlarged, removed or partially cut to better illustrate and explain the disclosure of the utility model. Some components in the accompanying drawings can be adjusted in position according to actual needs without affecting the technical effect. The phrase "in the accompanying drawings" or similar terms appearing in the specification do not necessarily refer to all drawings or examples.

[0033] Certain directional terms used to describe the drawings below, such as "inside", "outside", "above", "below" and other directional terms, will be understood to have their normal meanings and refer to those directions involved when the drawings are normally viewed. Unless otherwise specified, the directional terms described in this specification are basically in accordance with the conventional directions understood by those skilled in the art.

[0034] The terms "first", "first", "second", "second" and the like used in the present invention do not indicate any order, quantity or importance, but are used to distinguish one component from other components.

[0035] The utility model aims to provide a matching inlet and outlet line connection scheme for a capacitor group, which allows the capacitor to be connected to the power equipment with a shorter soft wire, and realizes a stable and safe connection between the soft wire of the capacitor and the tube bus. In addition, the scheme is universal, and a single-wire clamp or a double-wire clamp can be selected for connection according to the current size of the capacitor group and the connection mode (series or parallel) between the capacitors in the capacitor group to meet the needs of different capacitor groups. The wiring scheme also has the advantages of simple structure but stable connection, which can effectively reduce safety accidents. The wiring assembly of this scheme is particularly suitable for ultra-high voltage DC capacitor groups, ultra-high voltage AC capacitor groups, ultra-high voltage series capacitor groups, and other large-capacity capacitor groups of the State Grid.

[0036] Figure 1 and Figure 2 The wiring assembly 4 for connecting the inlet and outlet of the capacitor bank is shown. Figure 1The wiring assembly 4 is shown to be connected between the flexible wire 3 of the capacitor and the connecting terminal 2 of the tube mother 1. Figure 2 Shows Figure 1 Schematic diagram of the disassembly of the wiring component 4.

[0037] like Figure 1 As shown, a connection terminal 2 is mounted on the tubular busbar 1, and a clamping portion 21 of the connection terminal 2 is clamped on the outer periphery of the tubular busbar 1, and a metal plate segment 22 extending from the clamping portion 21 is used to connect with the wiring assembly 4. To this end, the metal plate segment 22 can be configured with a through hole to be detachably connected to the wiring assembly 4 by means of a connecting member such as a bolt 5. Alternatively, the metal plate segment 22 can also be fixed to the wiring assembly 4 by means of welding or the like. In one embodiment, the metal plate segment 22 is configured as an aluminum plate segment, or in other words, the entire connection terminal 2 of the tubular busbar 1 is made of aluminum.

[0038] Figure 2 Shown in detail Figure 1 In the embodiment shown, the busbar 41 of the connection assembly 4 is configured as a long strip having a longitudinal direction and a relatively narrow transverse direction perpendicular to the longitudinal direction. Along the longitudinal direction, one end of the busbar 41 is marked as a first end 411, and the other opposite end is marked as a second end 412. As shown in the figure, the tubular busbar 1 and the flexible wire 3 of the capacitor are connected to the busbar 41 at the first end 411 and the second end 412, respectively.

[0039] As mentioned above, the busbar 41 can be detachably connected to the protruding plate section 22 of the connection terminal 2 of the tube busbar 1 by a connection member such as a bolt 5. To this end, a plurality of through holes 413 are provided at the first end 411 of the busbar 41. Although four through holes 413 and four bolts 5 are shown in the figure, it is conceivable that the number of through holes 413 and bolts 5 can be increased or decreased according to actual needs.

[0040] The busbar 41 can be made of a conductive metal material that is the same as the material of the metal plate segment 22. Alternatively, the busbar 41 can also be made of a conductive metal material that is different from the material of the metal plate segment 22. For example, the busbar 41 can be constructed with a copper substrate. At least a portion of the surface of the substrate can be treated to form an oxidation-resistant and wear-resistant surface treatment layer. A suitable surface treatment layer can be a tin-plated layer, or it can be a silver-plated layer.

[0041] In the case where the substrate of the busbar 41 is made of other conductive metal materials different from the material of the metal plate segment 22, a transition plate 42 can be set between the busbar 41 and the plate segment 22 to prevent the occurrence of galvanic corrosion. The transition plate 42 is constructed as a double-layered composite plate, wherein the first layer 421 is made of the same conductive metal material as the substrate material of the busbar 41, such as the first layer 421 can be a copper material layer, and the second layer 422 is made of the same conductive metal material as the plate segment 22 of the connecting terminal 2, such as the second layer 422 can be an aluminum material layer. The transition plate 42 can be formed by plating another conductive material on the surface of one of the conductive materials, such as copper plating on the surface of an aluminum sheet. Alternatively, the transition plate 42 can be formed by welding two conductive metal material sheets together or fusing them together in other suitable ways to form an integrated structure.

[0042] The first layer 421 and the second layer 422 of the transition plate 42 are tightly attached together, wherein the first layer 421 is also tightly attached to the surface of the busbar 41, and the second layer 422 is also tightly attached to the surface of the plate section 22 of the connecting terminal 2, thereby forming a transition layer between the busbar 41 made of different conductive metal materials and the tube busbar connecting terminal 2 to avoid heating caused by the potential difference.

[0043] The transition plate 42 may be permanently fixed between the busbar 41 and the tube busbar connection terminal 2. Alternatively, the busbar 41, the transition plate 42 and the plate section 22 of the connection terminal 2 may be detachably connected together by means of the same bolt 5. To this end, the transition plate 42 may also form through holes 423, and the number and position of the through holes 423 are adapted to the number and position of the through holes 413 at the first end 411 of the busbar 41.

[0044] The soft wire 3 of the capacitor is connected to the tubular busbar 1 through a wire clamp 43 located at the second end 412 of the busbar 41. The soft wire 3 can be a copper stranded wire. In the illustrated embodiment, the wire clamp 43 includes a connecting plate 432 that is roughly in the shape of a long rectangular strip and a sleeve 431 extending from the connecting plate 432. The inner hole of the sleeve 431 can accommodate the soft wire 3 of the capacitor and clamp the soft wire 3 to prevent it from slipping out. The connecting plate 432 is a plate with a flat surface that can fit tightly on the second end 412 of the busbar 41. The connecting plate 432 can be fixed to the second end 412 of the busbar 41 by welding or the like. Alternatively, the connecting plate 432 can be detachably mounted on the second end 412 of the busbar 41 by a connecting member such as a bolt 6. To this end, the second end 412 of the busbar 41 is formed with a through hole 414, and the connecting plate 432 is formed with a through hole 433.

[0045] The connecting plate 432 has a plurality of through holes 433, which are arranged at intervals along the longitudinal direction of the busbar 41. Thus, the connecting plate 432 is constructed as a long strip of plate with the same orientation as the busbar 41. This can effectively increase the contact area between the wire clamp 43 and the busbar 41, reduce the contact resistance between the two, thereby meeting the requirement of the State Grid acceptance specification for a DC resistance of 20 μΩ, and can be applied to large current capacitor banks. The number of through holes 433 arranged longitudinally on the connecting plate 432 can be two, as shown in the figure, or the number of through holes 433 can be further increased as needed.

[0046] The flexible wire 3 of the capacitor can be a wire clamp 43 pre-connected to the wiring assembly 4 during the factory production stage. A reliable connection method is to fix tightly by mechanical cold pressing. In this way, a stable and reliable connection between the flexible wire 3 and the wiring assembly 4 is achieved. After the power grid is powered on, the wire clamp and the flexible wire will not become loose due to the contraction of the flexible wire 3, thereby preventing the flexible wire 3 from heating up or even burning.

[0047] Since a long busbar 41 is provided between the soft conductor 3 and the tube busbar 1, the length of the soft conductor 3 can be reduced, thereby avoiding the insulation distance from being reduced due to the soft conductor 6 being too long and sagging, bending, or swinging with the wind, and other safety accidents caused thereby.

[0048] The wiring assembly 4 of this solution has strong adaptability, and the number and layout of the wire clips 43 can be selected according to the current size of the capacitor group and the connection method between the capacitors in the capacitor group.

[0049] For example, Figure 1 and Figure 2 The wiring assembly 4 of the single wire clamp 43 is shown. In this solution, the single wire clamp 43 is detachably mounted on the second end 412 of the busbar 41 by means of bolts 6. Figure 3 and Figure 4 In the embodiment, it is shown that the double clamps 43 are detachably mounted on the second end 412 of the busbar 41 by respective matching bolts 6 .

[0050] like Figure 3 and Figure 4 As shown, it is shown that Figure 1 and Figure 2 A slightly different wiring assembly 4, wherein the main difference is that two wire clamps 43 are installed in parallel at the second end 412 of the busbar 41 along the transverse direction of the busbar 41, wherein the sleeve 431 of each wire clamp 43 is connected to a soft wire 3. In addition, the other components of the wiring assembly 4 can be the same as those of the wiring assembly 4. Figure 1 and Figure 2 Corresponding components of the terminal assembly 4 in the embodiment shown.

[0051] It should be understood that although this specification is described according to various embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0052] The above description is only an illustrative embodiment of the present invention and is not intended to limit the scope of the present invention. Any equivalent changes, modifications and combinations made by any technician in the field without departing from the concept and principle of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A wiring assembly for a capacitor bank, the capacitor bank comprising a plurality of capacitors and a tubular busbar (1), characterized in that: The wiring assembly comprises: A busbar (41) extending longitudinally and having a first end (411) and a second end (412) opposite to each other in the longitudinal direction, wherein the first end (411) is adapted to be detachably connected to the tubular busbar (1); A wire clamp (43) is detachably connected to the second end (412) of the busbar (41), wherein the wire clamp (43) comprises a sleeve (431) suitable for sleeve-fitting the soft wire (3) of the capacitor and a connecting plate (432) connected to the sleeve (431) and abutting against the busbar (41), wherein the connecting plate (432) comprises a plurality of connecting through holes arranged along the longitudinal direction.

2. The wiring assembly according to claim 1, characterized in that: The connecting plate (432) has a pair of connecting through holes arranged along the longitudinal direction.

3. The wiring assembly according to claim 1, characterized in that: The busbar (41) has a substrate of a first conductive material, the connecting terminal (2) of the tubular busbar (1) has a plate segment (22) of a second conductive material, a transition plate (42) is arranged on the side of the substrate, the transition plate (42) comprises a first layer (421) of the first conductive material and a second layer (422) of the second conductive material, wherein the first layer (421) is attached to the substrate, and the second layer (422) is suitable for attaching to the plate segment (22) of the connecting terminal (2).

4. The wiring assembly according to claim 3, characterized in that: The busbar (41) has a surface treatment layer applied to at least a portion of the surface of the substrate.

5. The wiring assembly according to claim 3, characterized in that: The busbar (41) and the transition plate (42) are adapted to be detachably connected to the plate section (22) of the connection terminal (2) via the same connection piece.

6. The wiring assembly according to claim 3, characterized in that: The busbar (41) is configured in the shape of a rectangular long strip and has connecting through holes at the first end (411) and the second end (412).

7. The junction assembly according to any one of claims 1 to 6, characterized in that: The wire clamp (43) is pre-cooled and pressed to be connected to the soft wire (3) of the capacitor at the factory.

8. The junction assembly according to any one of claims 1 to 6, characterized in that: Two wire clamps (43) are arranged side by side at the second end (412) of the busbar (41) perpendicular to the longitudinal direction.

9. The junction assembly according to any one of claims 1 to 6, characterized in that: The flexible wire (3) of the capacitor and the connection terminal (2) of the tube busbar (1) are respectively connected to two opposite sides of the busbar (41).

10. A capacitor bank comprising: A tubular busbar (1) having a connection terminal (2); A plurality of capacitors, each of which is connected to a flexible wire (3); A wiring assembly (4) connected between a connection terminal (2) of the tube busbar (1) and a flexible wire (3) of the capacitor; It is characterized in that the wiring assembly (4) is the wiring assembly according to any one of claims 1 to 9, wherein the connecting terminal (2) of the tubular busbar (1) is connected to the first end (411) of the busbar (41) of the wiring assembly, and the wire clamp (43) of the wiring assembly is connected to the soft wire (3) of the capacitor at the second end (412) of the busbar (41).

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