A type of cross-line busbar fitting

Abstract

This invention discloses a cross-line busbar fitting, belonging to the field of power transmission and transformation technology. It includes two terminals, two expansion joints, two clamps at both ends of the busbar, a busbar end cap at one end of the busbar, a telescopic structure between the other end of the busbar and the corresponding terminal, and an offset structure between the busbar end cap and the corresponding terminal. The busbar end cap is located outside the clamp at the corresponding end, and the busbar is located between the two terminals with its other end open. The telescopic structure is arranged along the direction of the busbar, inserted into the other end of the busbar, and can move in the direction of the busbar. The offset structure is located on the outer end face of the busbar end cap and is universally connected to the inner end of the corresponding terminal. The terminal and the clamp at the corresponding end are connected by an expansion joint. It has advantages such as simplicity, ease of installation, and light weight.

Description

Technical Field

[0001] This invention belongs to the field of power transmission and transformation technology, and specifically relates to a cross-line busbar fitting. Background Technology

[0002] A substation is a location in a power system that transforms voltage and current, receives electrical energy, and distributes it. Primary equipment refers to equipment that directly produces, transmits, distributes, and uses electrical energy, mainly including transformers, high-voltage circuit breakers, disconnect switches, busbars, surge arresters, capacitors, and reactors. Both the input and output of electrical energy in a substation are operated through primary equipment. Since the substation's incoming and outgoing lines are outside the substation's perimeter, the equipment inside the substation is connected to the external towers via cross-busbar hardware. Cross-busbar hardware provides both mechanical support for the busbars and electrical connections between equipment. For example... Figure 1 The diagram shows the structure of an existing cross-pass fitting. The existing cross-pass fitting consists of two clamps on the busbar, a flow-guiding expansion joint at both ends for electrically connecting the busbar to the equipment, and a universal joint and sliding bracket that are fixed at both ends to the two clamps and support the ends of the flow-guiding expansion joint.

[0003] Specifically, patent application number CN201620774227.6 discloses a special cross-line busbar fitting for 500kV substations, including a first connecting end and a second connecting end respectively. The first connecting end and the second connecting end are respectively provided with a first mounting clamp and a second mounting clamp for fixing the tubular busbar. A first expansion joint is connected to the first mounting clamp, and a second expansion joint is connected to the second mounting clamp. It also includes a universal joint device installed with the first expansion joint and a guide shaft device installed with the second expansion joint. The first mounting clamp is provided with a mounting groove for installing the tubular busbar. The mounting groove is provided with clamping teeth on both sides. The clamping teeth have a stepped structure, and clamping protrusions are provided between the clamping teeth on both sides.

[0004] For example, patent application number CN201120025284.1 discloses a height-adjustable cross-road fitting, including a clamp, a universal joint, a sliding bracket and a flow guide expansion joint. One end of the universal joint is set as a connecting sleeve, which can move on a threaded support rod with a height adjustment nut and be connected and fixed to the height adjustment nut by a fixing bolt, or the connecting sleeve at one end of the universal joint is directly connected and fixed to the threaded support rod.

[0005] For example, patent application number CN03278874.6 discloses an adjustable cross-road fitting, including a cross-road busbar and two expansion joints (I) and (II) respectively connected to both ends of the cross-road busbar. One expansion joint (I) is also connected to a universal joint at both ends, and one end of the other expansion joint (II) is connected to a support frame. A straight rod is connected to the support frame, and a ring is slidably fitted on the straight rod. A screw is connected to the lower end of the ring, which passes through a connecting plate at the other end of the expansion joint (II), and two fastening nuts are fitted on the screw. The relative height of the two ends of the expansion joint (II) can be adjusted by the two fastening nuts and the screw to adapt to infrastructure of different heights. The sliding of the ring on the straight rod can also solve the problem of thermal expansion and contraction of equipment and busbar at different temperatures.

[0006] For example, patent application number CN202022225279.7 discloses a cross-busbar transition fitting, including a left support mechanism and a right support mechanism. The left and right support mechanisms respectively provide mechanical support for both ends of the busbar. The left support mechanism includes two first fixed plates, a first telescopic belt, a left clamp, two first fixed seats, and an adjustable component. The two first fixed plates are connected by the first telescopic belt to change the overall length. The left clamp is fixed to one of the first fixed plates, and the two first fixed seats are respectively fixed to the two first fixed plates and connected by the adjustable component. The right support mechanism includes two second fixed plates, a second telescopic belt, a right clamp, a second fixed seat, a sliding frame, and a sliding rod. The two second fixed plates are connected by the second telescopic belt to change the overall length. The right clamp is fixed to one of the second fixed plates, and the second fixed seat is fixed to one of the second fixed plates. The sliding frame is slidably mounted on another second fixed plate, and the sliding rod is fixed on the second fixed seat and sleeved on the sliding rod.

[0007] The applicant discovered during the use of the aforementioned hardware that: the hardware has a complex structure and, due to the use of too many iron parts, the product is heavy, which puts a lot of pressure on the equipment terminal block. During long-term operation, the equipment terminal block is subjected to a large external load, which may cause the equipment terminal block to bend and deform, affecting the safe operation of the substation. Summary of the Invention

[0008] To address the aforementioned problems, this invention provides a cross-busbar fitting that is simple, easy to install, and lightweight. The technical solution is as follows:

[0009] This invention provides a cross-line busbar fitting, including two terminals 2, two expansion joints 4, two clamps 3 at both ends of a busbar 1, a busbar end cap 5 at one end of the busbar 1, a telescopic structure 6 between the other end of the busbar 1 and the corresponding terminal 2, and an offset structure 7 between the busbar end cap 5 and the corresponding terminal 2. The busbar end cap 5 is located outside the clamp 3 at the corresponding end, and the busbar 1 is located between the two terminals 2 with its other end open. The telescopic structure 6 is arranged along the direction of the busbar 1, inserted into the other end of the busbar 1, and can move in the direction of the busbar 1. The offset structure 7 is provided on the outer end face of the busbar end cap 5 and is universally connected to the inner end of the corresponding terminal 2. The terminal 2 and the clamp 3 at the corresponding end are connected by the expansion joint 4.

[0010] In this embodiment of the invention, the offset structure 7 includes a fixing plate 71 and a universal joint. The fixing plate 71 has a terminal 2 on its outer side in the direction of the busbar 1 and a telescopic joint 4 between it and the corresponding clamp 3. The universal joint is arranged in the direction of the busbar 1 and is located between the inner side of the fixing plate 71 and the outer end face of the busbar end cap 5.

[0011] In this embodiment of the invention, the tube end cap 5 is composed of two semi-circular end caps arranged vertically opposite each other, and the two semi-circular end caps are tightly fixed to the end of the tube busbar 1; the universal joint includes two inner fixing seats arranged vertically side by side on the tube end cap 5, two outer fixing seats 73 arranged vertically side by side on the inner side of the fixing plate 71, two offset block sleeves 74 arranged horizontally side by side between the two inner fixing seats, an offset block 75 arranged along the direction of the tube busbar 1, an outer rotating shaft 76 arranged vertically at the outer end of the offset block 75, and an inner rotating shaft 77 arranged horizontally at the inner end of the offset block 75; the two outer fixing seats 73 are respectively located at the upper and lower ends of the outer ends of the offset block 75. The outer rotating shaft 76 is arranged on both sides in a left-right direction; the upper and lower ends of the outer rotating shaft 76 are respectively provided on two outer fixing seats 73; the two inner fixing seats are respectively provided on the outer end faces of the two semi-circular end caps, which are located on the upper and lower sides of the inner end of the offset block 75, and are located on the inner side of the corresponding outer fixing seat 73; the inner fixing seat includes two fixing ears 72 arranged side by side and located on the left and right sides of the offset block 75 respectively; the two offset block sleeves 74 are respectively located on the left and right sides of the inner end of the offset block 75, and their upper and lower sides are respectively fixed on the fixing ears 72 on the same side of the two semi-circular end caps; the two ends of the inner rotating shaft 77 are respectively provided on the two offset block sleeves 74.

[0012] Specifically, in this embodiment of the invention, the fixing plate 71 is a rectangular plate arranged in the left and right direction with rounded corners, the offset block 75 is a rectangular block, and the offset block sleeve 74 is a rectangular groove structure with an outward opening and is arranged in the direction of the offset block 75.

[0013] In this embodiment of the invention, the telescopic structure 6 includes a telescopic inner tube 61 arranged inside the busbar 1 and along the direction of the busbar 1, a fixed end cap 62 at the outer end of the telescopic inner tube 61, two sliding grooves 63 on the telescopic inner tube 61, and at least one pin 64 on the busbar 1; another terminal 2 is provided at the middle of the outer end face of the fixed end cap 62 along the direction of the busbar 1, and another telescopic joint 4 is provided between it and the corresponding end clamp 3; the two sliding grooves 63 are arranged opposite each other and along the direction of the telescopic inner tube 61; the pin 64 is perpendicular to the telescopic inner tube 61, and its two ends are located on opposite sides of the busbar 1, and it is slidably disposed in the two sliding grooves 63.

[0014] Specifically, in this embodiment of the invention, there are two pins 64. The two pins 64 are arranged side by side in the direction of the busbar 1 and are both located outside the corresponding end of the clamp 3.

[0015] Preferably, in the embodiments of the present invention, the wire clamp 3, the female tube end cap 5, the telescopic structure 6 and the offset structure 7 are all aluminum alloy fittings.

[0016] In this embodiment of the invention, the expansion joint 4 is a U-shaped conductor and it is located on the upper side of the busbar 1.

[0017] The beneficial effects of the technical solution provided by the embodiments of the present invention are as follows:

[0018] (1) The structure is simple and the number of parts is less than that of existing technologies;

[0019] (2) Easy to install, requiring no more bolts and nuts than existing technologies, saving time and effort;

[0020] (3) The strength and power transmission requirements can be met by using aluminum alloy materials, and aluminum alloy fittings are used in all cases.

[0021] (4) If aluminum alloy is used, the weight is about 30% of the weight of existing technology, which is much lighter. This not only reduces the load on the equipment, but also makes it easier to install.

[0022] (5) If aluminum alloy is used, there is no hysteresis and eddy current loss;

[0023] (6) Setting an offset structure, in conjunction with a telescopic structure, can eliminate the height error of the equipment caused by foundation settlement and the center offset error caused by equipment installation.

[0024] (7) The expansion and contraction structure can eliminate the effects of thermal expansion and contraction. Attached Figure Description

[0025] Figure 1 This is a structural schematic diagram of existing cross-road busbar hardware;

[0026] Figure 2 This is a schematic diagram of the cross-busbar fittings in an embodiment of the present invention;

[0027] Figure 3 This is a schematic diagram of the offset structure;

[0028] Figure 4 This is a structural diagram of the assembly of the terminal block, fixing plate, and external fixing base;

[0029] Figure 5 yes Figure 4 The inner view;

[0030] Figure 6 yes Figure 4 Top view;

[0031] Figure 7 This is a schematic diagram of the structure of the tube end cap and the inner fixing seat assembly;

[0032] Figure 8 yes Figure 7 The outer view;

[0033] Figure 9 yes Figure 7 A bottom view;

[0034] Figure 10 yes Figure 7 A sectional view;

[0035] Figure 11 This is a schematic diagram of the offset block structure;

[0036] Figure 12 This is a schematic diagram of the offset block jacket structure;

[0037] Figure 13 This is a side view of the offset block sleeve;

[0038] Figure 14 This is a schematic diagram of the telescopic structure;

[0039] Figure 15 This is a structural diagram of the combination of the telescopic inner tube, the fixed end cap, and the wiring terminal.

[0040] In the diagram: 1. Busbar, 2. Terminal, 3. Wire clamp, 4. Expansion joint, 5. Busbar end cap, 6. Telescopic structure, 7. Offset structure;

[0041] 21 Front terminal, 22 Rear terminal;

[0042] 31 front clamp, 32 rear clamp;

[0043] 41 Front expansion joint, 42 Rear expansion joint;

[0044] 61 Telescopic inner tube, 62 Fixed end cap, 63 Slide groove, 64 Pin;

[0045] 71 Fixed plate, 72 Fixed ear, 73 External fixed seat, 74 Offset block sleeve, 75 Offset block, 76 External rotating shaft, 77 Internal rotating shaft. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings.

[0047] Example 1

[0048] See Figure 2-15 Example 1 provides a cross-line busbar fitting, including two terminals 2, two expansion joints 4, two clamps 3 at both ends of a busbar 1, a busbar end cap 5 at one end of the busbar 1, a telescopic structure 6 between the other end of the busbar 1 and the corresponding terminal 2, and an offset structure 7 between the busbar end cap 5 and the corresponding terminal 2. The busbar end cap 5 is located outside the clamp 3 at the corresponding end, and the busbar 1 is located between the two terminals 2 with its other end open. Specifically, the busbar 1 and the two terminals 2 are basically on the same horizontal line. The telescopic structure 6 is arranged along the direction of the busbar 1, inserted into the other end of the busbar 1, and can move in the direction of the busbar 1. The function of the telescopic structure 6 is to eliminate the effects of thermal expansion and contraction. The offset structure 7 is located on the outer end face of the busbar end cap 5 and is universally connected to the inner end of the corresponding terminal 2. Specifically, the terminal 2 connected to the offset structure 7 and the busbar 1 can rotate vertically and horizontally. The function of the offset structure 7 is to, in conjunction with the expansion joint, eliminate height errors caused by foundation settlement and center offset errors caused by equipment installation. Terminal 2 is connected to the corresponding clamp 3 via an expansion joint 4.

[0049] Among them, see Figure 3-13In this embodiment of the invention, the end cap 5 of the tube busbar is composed of two semi-circular end caps (specifically, an upper semi-circular end cap and a lower semi-circular end cap) arranged opposite each other. The two semi-circular end caps are tightly clamped (locked by vertically arranged bolts) and fixed to the end of the tube busbar 1. The offset structure 7 includes a fixing plate 71 and a universal joint. A terminal 2 is provided on the outer center of the fixing plate 71 along the direction of the tube busbar 1, and a telescopic joint 4 is provided between the terminal 2 and the corresponding end clamp 3. The terminal 2 is perpendicular to the fixing plate 71. The universal joint is arranged along the direction of the tube busbar 1, located between the inner side of the fixing plate 71 and the outer end face of the end cap 5. The universal joint includes two inner fixing seats (composed of two fixing ears), two outer fixing seats 73, two offset block sleeves 74, an offset block 75, an outer rotating shaft 76, and an inner rotating shaft 77. The offset block 75 is arranged along the direction of the tube busbar 1 and can specifically be a rectangular block. Two external fixing seats 73 are located on the upper and lower sides of the outer end of the offset block 75, respectively, and are situated inside the fixing plate 71. They are arranged horizontally and vertically side by side. The outer rotating shaft 76 is arranged vertically, located at the outer end of the offset block 75, with its upper and lower ends respectively mounted on the two external fixing seats 73. Two internal fixing seats are located on the outer end faces of the two semi-circular end caps, arranged vertically side by side, and are situated on the upper and lower sides of the inner end of the offset block 75, respectively, and are situated inside the corresponding external fixing seats 73. Each internal fixing seat includes two fixing ears 72 arranged horizontally and vertically side by side, respectively located on the left and right sides of the offset block 75. Two offset block sleeves 74 are located between the two internal fixing seats, respectively located on the left and right sides of the inner end of the offset block 75, arranged back-to-back (slots back-to-back), and their upper and lower ends are respectively fixed (by bolts) to the fixing ears 72 on the same side (left or right) of the two semi-circular end caps. Specifically, the offset block sleeve 74 is an outwardly open rectangular groove structure and is arranged along the direction of the offset block 75. The inner rotating shaft 77 is arranged in the left-right direction, located at the inner end of the offset block 75, and its left and right ends are respectively arranged on the two offset block sleeves 74.

[0050] In this embodiment of the invention, the terminal 2 is horizontally positioned, and the fixing plate 71 is a rectangular plate positioned along the left and right directions with rounded corners at its four corners.

[0051] Among them, see Figure 2 and 14-15. The telescopic structure 6 in this embodiment of the invention includes a telescopic inner tube 61, a fixed end cap 62, two sliding grooves 63, and two pins 64. The telescopic inner tube 61 is arranged along the direction of the busbar 1, located inside the busbar 1, with its outer diameter slightly smaller than the inner diameter of the busbar 1, and its outer end extending out of the busbar 1. The fixed end cap 62 is located at the outer end of the telescopic inner tube 61, and its outer end face has another terminal 2 along the direction of the busbar 1, with another telescopic joint 4 between it and the corresponding end clamp 3. The terminal 2 is perpendicular to the outer end face of the fixed end cap 62. The two sliding grooves 63 are both provided on the telescopic inner tube 61, arranged opposite each other, and arranged along the direction of the telescopic inner tube 61. The two pins 64 are arranged side by side in the direction of the busbar 1, both located outside the corresponding end clamp 3, perpendicular to the telescopic inner tube 61, with their two ends located on opposite sides of the busbar 1, and slidably disposed in the two sliding grooves 63.

[0052] Preferably, in the embodiments of the present invention, the wire clamp 3, the tube end cap 5, the telescopic structure 6 and the offset structure 7 are all aluminum alloy fittings to reduce weight and eliminate hysteresis and eddy current losses.

[0053] In this embodiment of the invention, the expansion joint 4 is a U-shaped conductor and it is located on the upper side of the busbar 1.

[0054] Example 2

[0055] See Figure 2-15 Example 2 provides a cross-line busbar fitting, including two terminals 2 (front terminal 21 and rear terminal 22, respectively), two expansion joints 4 (front expansion joint 41 and rear expansion joint 42), two clamps 3 (front clamp 31 and rear clamp 32) at the front and rear ends of the busbar 1, a busbar end cap 5 at the front end of the busbar 1, an expansion structure 6 between the rear end of the busbar 1 and the rear terminal 22, and an offset structure 7 between the busbar end cap 5 and the front terminal 21, etc. The busbar 1 is arranged in the front-rear direction, the front terminal 21 is arranged in the front-rear direction and is located in front of the busbar 1, the rear terminal 22 is arranged in the front-rear direction and is located in rear of the busbar 1, the front expansion joint 41 is located between the front clamp 31 and the offset structure 7 (specifically, the fixing plate 71), and the rear expansion joint 42 is located between the rear clamp 32 and the expansion structure 6 (specifically, the fixing end cap 62). Both the telescopic structure 6 and the offset structure 7 are arranged in the front-to-back direction. The telescopic structure 6 can move in the front-to-back direction, and the offset structure 7 can rotate in the up-down direction and the left-to-right direction.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A cross-line busbar fitting, comprising two terminals (2), two expansion joints (4), and two clamps (3) at both ends of a busbar (1), characterized in that, It also includes a busbar end cap (5) at one end of the busbar (1), a telescopic structure (6) between the other end of the busbar (1) and the corresponding terminal (2), and an offset structure (7) between the busbar end cap (5) and the corresponding terminal (2). The busbar end cap (5) is located outside the clamp (3) at the corresponding end. The busbar (1) is located between the two terminals (2) and its other end is open. The telescopic structure (6) is set along the direction of the busbar (1) and is inserted into the other end of the busbar (1). It can move in the direction of the busbar (1). The offset structure (7) is set on the outer end face of the busbar end cap (5) and is universally connected to the inner end of the terminal (2) at the corresponding end. The terminal (2) and the clamp (3) at the corresponding end are connected by a telescopic joint (4). The offset structure (7) includes a fixed plate (71) and a universal joint. The fixed plate (71) has a terminal (2) on the outer middle part along the direction of the busbar (1) and a telescopic joint (4) between it and the corresponding end clamp (3). The universal joint is arranged along the direction of the busbar (1) and is located between the inner side of the fixed plate (71) and the outer end face of the busbar end cap (5). The end cap (5) of the tube is composed of two semi-circular end caps arranged opposite each other, and the two semi-circular end caps are tightly fixed to the end of the tube bus (1); The universal joint includes two inner fixing seats arranged side-by-side on the end cap (5), two outer fixing seats (73) arranged side-by-side on the inner side of the fixing plate (71), two offset block sleeves (74) arranged side-by-side between the two inner fixing seats, an offset block (75) arranged along the direction of the tube busbar (1), an outer rotating shaft (76) arranged vertically at the outer end of the offset block (75), and an inner rotating shaft (77) arranged horizontally at the inner end of the offset block (75); the two outer fixing seats (73) are located on the upper and lower sides of the outer end of the offset block (75), and are arranged horizontally; the upper and lower ends of the outer rotating shaft (76) are respectively located on the upper and lower sides of the outer end of the offset block (75). The two inner fixing seats are respectively located on the outer end faces of the two semi-circular end caps, and are respectively located on the upper and lower sides of the inner end of the offset block (75), and are located on the inner side of the corresponding outer fixing seat (73); the inner fixing seat includes two fixing ears (72) arranged side by side and respectively located on the left and right sides of the offset block (75); the two offset block sleeves (74) are respectively located on the left and right sides of the inner end of the offset block (75), and their upper and lower sides are respectively fixed on the fixing ears (72) on the same side of the two semi-circular end caps; the two ends of the inner rotating shaft (77) are respectively located on the two offset block sleeves (74); The telescopic structure (6) includes a telescopic inner tube (61) arranged inside the busbar (1) and along the direction of the busbar (1), a fixed end cap (62) at the outer end of the telescopic inner tube (61), two sliding grooves (63) on the telescopic inner tube (61), and at least one pin (64) on the busbar (1); another terminal (2) is provided at the middle of the outer end face of the fixed end cap (62) along the direction of the busbar (1), and another telescopic joint (4) is provided between it and the wire clamp (3) at the corresponding end; the two sliding grooves (63) are arranged opposite to each other and along the direction of the telescopic inner tube (61); the pin (64) is perpendicular to the telescopic inner tube (61), and its two ends are located on opposite sides of the busbar (1), and it is slidably arranged in the two sliding grooves (63); The wire clamp (3), the tube end cap (5), the telescopic structure (6) and the offset structure (7) are all aluminum alloy fittings.

2. The cross-busbar fitting according to claim 1, characterized in that, The fixing plate (71) is a rectangular plate arranged in the left and right directions with rounded corners at its four corners.

3. The cross-busbar fitting according to claim 1, characterized in that, The number of pins (64) is two. The two pins (64) are arranged side by side in the direction of the busbar (1) and are both located outside the wire clamp (3) at the corresponding end.

4. The cross-busbar fitting according to claim 1, characterized in that, The expansion joint (4) is a U-shaped conductor, and the expansion joint (4) is located on the upper side of the busbar (1).

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