Transmission tower

Abstract

The present application discloses a transmission tower, comprising a tower body and composite crossarms arranged on the tower body. Each composite crossarm comprises at least one insulator and an end fitting. The end fitting is connected to the high-voltage end of the insulator to form an end portion of the composite crossarm for hanging first transmission lines. The end fitting comprises a connection part. The connection part is provided with two line hanging plates and a jumper connection piece. The two line hanging plates are distributed on two sides of the connection part in the extension direction of the first transmission lines. A first jumper is electrically connected to the first transmission lines located on two sides of the tower body and is hung on the jumper connection piece. In the present application, the composite crossarms are applied to a tension tower; connection joints are simple in structure, novel and attractive; power transmission paths are clear; transportation and subsequent operation and maintenance are facilitated; the overall stability of the transmission tower is improved; and the safety of transmission lines is improved.

Description

A transmission tower Technical Field

[0001] The present application relates to the technical field of power transmission, and in particular to a transmission tower. Background Art

[0002] At present, composite cross-arm straight towers have gradually begun to be used in large quantities in transmission lines at home and abroad, and have achieved good economic and technical results. However, there are few application results of tension-resistant composite cross-arm towers in transmission lines at home and abroad. For transmission lines, corner towers and tension towers occupy an important position in the design of transmission line engineering, which is of great significance to the development of EPC general contracting business of transmission lines at home and abroad. Therefore, there is an urgent need to design a tension-resistant composite cross-arm tower.

[0003] Summary of the Invention

[0004] The main purpose of this application is to provide a transmission tower that uses composite crossarms for tension towers. The connection node structure is simple, novel, and beautiful, the force transmission path is clear, and transportation and subsequent operation and maintenance are convenient. The overall stability of the transmission line tower is increased, and the safety of the transmission line is improved.

[0005] In order to solve the above technical problems, the technical solution adopted in this application is: to provide a transmission tower, including a tower body and a composite crossarm arranged on the tower body, the composite crossarm including at least one insulator and an end fitting, the end fitting being connected to the high-voltage end of the insulator to form a composite crossarm for hanging the end of the first transmission line, the end fitting including a connecting part, the connecting part being provided with two hanging plates and a jumper connector, the two hanging plates being distributed on both sides of the connecting part along the extension direction of the first transmission line, the first jumper being electrically connected to the first transmission lines located on both sides of the tower body and being hung on the jumper connector.

[0006] The connecting portion is cylindrical.

[0007] Wherein, the wire hanging plate and the jumper connector are both connected to the outer periphery of the connecting part.

[0008] Among them, a first connecting plate and a second connecting plate are provided at both ends of the connecting part. The first connecting plate covers the end hardware away from the end of the insulator, and the second connecting plate extends outward from the other end of the connecting part along the radial direction of the connecting part to form a fully enclosed structure.

[0009] Wherein, construction holes are provided on the first connecting plate and the second connecting plate.

[0010] Among them, the transmission tower also includes a tension fitting, and a first mounting hole is provided on the hanging plate. One end of the tension fitting is fixedly connected to the first mounting hole, and the other end is used to hang the first transmission line.

[0011] Among them, the tension hardware includes a first tension connecting plate, a second tension connecting plate and two first tension connecting pieces. The first tension connecting plate and the second tension connecting plate are arranged at intervals. One end of the two first tension connecting pieces is connected to the first tension connecting plate, and the other end is connected to the second tension connecting plate.

[0012] Among them, the tension fittings include a first tension connecting plate, two first tension connecting members and two second tension connecting members. The two second tension connecting members correspond one-to-one to the two first tension connecting members, and the two second tension connecting members are connected to the first tension connecting plate through their respective corresponding first tension connecting members.

[0013] The jumper connector is located at the bottom of the connection part, the jumper connector is located between the two hanging boards, and a hanging hardware string is hung on the jumper connector for hanging the first jumper.

[0014] Among them, two composite cross-arms are arranged at the same height on the tower body. The two composite cross-arms are axially symmetrically distributed relative to the axis of the tower body, and the axes of the two composite cross-arms are located on the same straight line, thus forming a composite cross-arm assembly. Three groups of composite cross-arm assemblies are arranged in sequence from bottom to top on the tower body for hanging double-circuit transmission lines.

[0015] Among them, two composite cross-arms are set at the same height on the tower body. The two composite cross-arms are axially symmetrical with respect to the axis of the tower body, and the axes of the two composite cross-arms are located on the same straight line, thus forming a composite cross-arm assembly. Six groups of composite cross-arm assemblies are arranged in sequence from bottom to top on the tower body for hanging four-circuit transmission lines.

[0016] Among them, the transmission tower also includes a ground wire support, a jumper string and a tension insulator string. The ground wire support is arranged at the top of the tower body, the jumper string is vertically hung on the end of the ground wire support away from the tower body, the tension insulator string is arranged on the tower body and located below the jumper string, a second jumper is hung between the tension insulator string and the jumper string, the composite crossarm is located below the tension insulator string, and the end of the tension insulator string away from the tower body is used to hang the second transmission line.

[0017] Among them, the tension insulator string includes two tension insulators, a first fixing hardware and a second fixing hardware. The two tension insulators are arranged in parallel. One end of the two tension insulators is fixedly connected to the tower body through the first fixing hardware, and the other end is hung with the second transmission line through the second fixing hardware.

[0018] There are two tension insulator strings, which are symmetrically distributed on both sides of the tower body along the extension direction of the second transmission line.

[0019] Among them, the first fixing hardware includes a first connecting plate, a first adjusting hardware and a second adjusting hardware. One end of the first connecting plate close to the tower body is connected to the tower body through the first adjusting hardware, and the other end is fixedly connected to the tension insulator through the second adjusting hardware.

[0020] Among them, the second fixing hardware includes a second connecting plate and a third adjusting hardware. The end of the second connecting plate close to the tower body is directly fixedly connected to the tension insulator, and the other end is connected to the second transmission line in an adjustable position through the third adjusting hardware.

[0021] The third adjusting hardware includes a DB-type adjusting plate and a U-type hardware. The DB-type adjusting plate is provided with a plurality of mounting portions arranged in an arc shape. The U-type hardware is selectively connected to one of the mounting portions.

[0022] Among them, a fixing part is provided on the top of the tower body, one end of the ground wire bracket is fixedly connected to the tower body through the fixing part, and the other end is connected to the jumper string.

[0023] Among them, the jumper string includes two jumper insulators, a third fixing hardware and a hanging hardware. The two jumper insulators are arranged in parallel. One end of the two jumper insulators is fixedly connected to the ground wire bracket through the third fixing hardware, and the other end is hung with the second jumper through the hanging hardware.

[0024] The second jumper is electrically connected to the second transmission lines located on both sides of the tower body.

[0025] The composite crossarm of the present application is used for a tension tower, and the composite crossarm includes at least one insulator, and the high-voltage end of at least one insulator is connected together through an end fitting to form a composite crossarm for hanging the end of a transmission line, and the end fitting can be set as a single hanging point (a first mounting hole is set on the tension fitting) or a double hanging point (two first mounting holes are set on the tension fitting), which can achieve the following technical effects: 1) ensure normal design and three-span design considerations, ensure that the composite crossarm is uniformly stressed, reduce the difficulty of installing the composite crossarm, and save installation time and cost; 2) reduce the processing accuracy of the composite crossarm; 3) reduce the distance between conductor layers, shorten the corridor width, compress the tower head size, and improve the electric field distribution and electromagnetic environment of the tension tower; 4) reduce the conductor load effect and tower head wind load, reduce the tower weight and foundation force; 5) solve the problem of applying traditional tension towers in areas with limited corridors and high land acquisition requirements; 6) reduce the investment and operation and maintenance costs of the transmission line body and the entire life cycle, and achieve maintenance-free operation throughout the entire life cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of this application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be derived from these drawings without inventive effort. Among them:

[0027] FIG1 is a schematic structural diagram of a first embodiment of a transmission tower of the present application;

[0028] FIG2 is an enlarged schematic diagram of point A in FIG1 ;

[0029] FIG3 is a schematic structural diagram of an end fitting in one embodiment of the present application;

[0030] FIG4 is a schematic diagram of the structure of the connection between the end fitting and the insulator in another embodiment of the present application;

[0031] FIG5 is a schematic structural diagram of an end fitting according to another embodiment of the present application;

[0032] FIG6 is a schematic structural diagram of a second embodiment of a transmission tower of the present application;

[0033] FIG7 is a schematic structural diagram of a third embodiment of a transmission tower of the present application;

[0034] FIG8 is an enlarged schematic diagram of point B in FIG7;

[0035] FIG9 is an enlarged schematic diagram of point C in FIG7 ;

[0036] FIG10 is an enlarged schematic diagram of point D in FIG7 . DETAILED DESCRIPTION

[0037] The following is a clear and complete description of the technical solutions in the embodiments of the present application in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0038] Referring to FIG. 1 , the present application provides a transmission tower 10 , which includes a tower body 11 and a composite crossarm 100 disposed on the tower body 11 . The composite crossarm 100 includes at least one insulator 110 and an end fitting 120 . The low-voltage end 110 b of the at least one insulator 110 is used to connect to the tower body 11 , and the high-voltage end 110 a of the at least one insulator 110 is connected together through the end fitting 120 to form the end 100 a of the composite crossarm 100 for hanging a transmission line. This ensures the stability of the connection of all insulators 110 , thereby ensuring the stability and strength of the composite crossarm 100 .

[0039] One or more composite crossarms 100 can be installed on only one side of the tower body 11, or composite crossarms 100 can be installed on both symmetrical sides of the tower body 11. The number of insulators 110 can be one or more, and there is no limitation here. Each insulator 110 has a low-voltage end 110b and a high-voltage end 110a. The low-voltage end 110b is connected to the tower body 11. The high-voltage end 110a of at least one insulator 110 is connected together to form the end 100a of the composite crossarm 100, which is used to hang a transmission line. When there is only one insulator 110, the high-voltage end 110a of that insulator 110 forms the end 100a of the composite crossarm 100. When there are multiple insulators 110, the high-voltage ends 110a of multiple insulators 110 are connected together to form the end 100a of the composite crossarm 100. In this embodiment, the transmission line hung on the end 100a of the composite crossarm 100 is defined as the first transmission line 101.

[0040] Referring to Figure 1 , a transmission tower 10 is a tension tower 10 having three composite crossarms 100 disposed symmetrically on either side of a tower body 11. The tower body 11 is a pole structure, specifically, a steel tube pole, a wooden pole, or a composite pole made of composite materials. In other embodiments, the tower body may also be a lattice structure, such as a lattice iron tower, without limitation.

[0041] 1 to 3 , along the extension direction of the first transmission line 101 , the first transmission line 101 is disconnected on both sides of the tower body 11 . The first transmission lines 101 on both sides of the tower body 11 are fixedly connected to the tower body 11 via end fittings 120 , and the first transmission lines 101 on both sides of the tower body 11 are electrically connected via a first jumper 102 .

[0042] The end fitting 120 includes a connecting portion 121 for connecting to the high-voltage terminal 110a of at least one insulator 110. Two hanging plates 122 and a jumper connector 123 are provided on the connecting portion 121. The two hanging plates 122 are located on either side of the connecting portion 121 along the extension direction of the first transmission line 101. The first jumper 102 electrically connects to the first transmission line 101 located on either side of the tower body 11 and is hooked onto the jumper connector 123. The connecting portion 121 has a cylindrical structure, and the hanging plates 122 and jumper connector 123 are both connected to the outer periphery of the connecting portion 121.

[0043] The cable hanger 122 is used to connect the first transmission line 101. Along the direction in which the first transmission line 101 extends, the first transmission line 101 on one side of the tower body 11 is tensioned via a tension clamp, which is connected to a cable hanger 122 on the end fitting 120 via a tension fitting 130. Simultaneously, the first transmission line 101 on the other side of the tower body 11 is also tensioned via another tension clamp, which is then connected to another cable hanger 122 on the end fitting 120 via another tension fitting 130. That is, along the direction in which the first transmission line 101 extends, the first transmission line 101 on either side of the tower body 11 is respectively hooked to the two cable hangers 122 on either side of the connection portion 121 via two tension fittings 130. The first jumper 102 is electrically connected between the tension clamps on both sides of the tower body 11 to enable power transmission. Of course, in other embodiments, the two hanging plates may not be located on both sides of the connection portion along the extension direction of the transmission line, as long as it can be ensured that the two hanging plates can be connected to the transmission lines on both sides of the tower body respectively.

[0044] The jumper connector 123 is used to connect the first jumper 102. The jumper connector 123 is located at the bottom of the connecting portion 121 and between the two hanging plates 122. The hanging hardware string 140 is connected to the jumper connector 123, and the first jumper 102 is then connected to the hanging hardware string 140. The structure of the jumper connector 123 can be the same as that of the hanging plates 122, for example, both are configured as plate-shaped structures. The hanging plates 122 and the jumper connector 123 are both connected to the connecting portion 121 to ensure that the structure of the end hardware 120 is compact and the connection strength is high.

[0045] Continuing to refer to Figures 2 and 3, in order to achieve the connection between the tension fitting 130 and the hanging plate 122, a first mounting hole 1221 may also be provided on the hanging plate 122. One end of the tension fitting 130 is fixedly connected to the first mounting hole 1221, and the other end of the tension fitting 130 is used to hang the first transmission line 101. In this embodiment, the hanging plate 122 is provided with a first mounting hole 1221. The tension fitting 130 is connected to the hanging plate 122 through the first mounting hole 1221, and at this time, the tension fitting 130 includes a first tension connection plate 131, a second tension connection plate 132, and a first tension connector 133. The first and second tension connection plates 131, 132 are spaced apart. To ensure the connection strength between the first and second tension connection plates 131, 132, two first tension connectors 133 are provided. One end of each of the two first tension connectors 133 is connected to the first tension connection plate 131, and the other end is connected to the second tension connection plate 132. Simultaneously, the first tension connection plate 131 is connected to a tension clamp to connect to the first transmission line 101. The second tension connection plate 132 is connected to the wire hanging plate 122 through the first mounting hole 1221.

[0046] Continuing to refer to Figure 3, the end fitting 120 also includes a first connecting plate 124 and a second connecting plate 125. The first connecting plate 124 and the second connecting plate 125 are respectively located at the two end surfaces of the connecting portion 121. The first connecting plate 124 covers the end of the end fitting 120 away from the insulator 110 to prevent moisture, impurities, etc. from penetrating into the interior of the insulator 110. The second connecting plate 125 extends outward from the other end of the connecting portion 121 along the radial direction of the connecting portion 121 to form a fully enclosed structure. The wire hanging plate 122 and the jumper connector 123 are both located between the first connecting plate 124 and the second connecting plate 125.

[0047] At the same time, construction holes 126 are provided on the circumference of the first connecting plate 124 and the second connecting plate 125 for lifting the composite cross arm 100 and for tightening and hanging the transmission line.

[0048] To ensure uniform force distribution across the tension fittings 130, the tension fittings 130 are symmetrical. In one application scenario, as shown in Figure 2, the first tension connecting plate 131 and the second tension connecting plate 132 are identical, both being plate members with a plurality of connection holes disposed on the plate surfaces for connection to the tension clamp, the first tension connector 133, and the first mounting hole 1221, respectively. The two first tension connectors 133 are disposed in parallel and can utilize common connection hardware, such as a combination of a U-shaped ring and an adjustment plate.

[0049] In another embodiment, referring to Figures 4 and 5 , the hanging plate 122 is provided with two first mounting holes 1221. The tension fittings 130 are connected to the hanging plate 122 through the two first mounting holes 1221. This further ensures the connection strength between the tension fittings 130 and the hanging plate 122, enabling the transmission tower 10 to span long overhead lines such as railways, highways, and canals. In this embodiment, the tension fittings 130 include a first tension connection plate 131, two first tension connectors 133, and two second tension connectors 134.

[0050] The first tension connection plate 131 is connected to the tension clamp to connect the first transmission line 101. The two second tension connectors 134 correspond one-to-one with the two first tension connectors 133. Each second tension connector 134 is connected to the first tension connection plate 131 through its corresponding first tension connector 133. Furthermore, the two second tension connectors 134 correspond one-to-one with the two first mounting holes 1221. Each second tension connector 134 is connected to the wire hanging plate 122 through its corresponding first mounting holes 1221. The second tension connectors 134 can be made of common hardware such as DB adjustment plates.

[0051] 5 , a reinforcing plate 127 is provided between the wire hanging plate 122 and the connecting portion 121 . The reinforcing plate 127 connects the plate surface of the wire hanging plate 122 and the outer peripheral surface of the connecting portion 121 at the same time. In addition, reinforcing plates 127 are provided on both plate surfaces of the wire hanging plate 122 to make the structure of the end fitting 120 more stable.

[0052] Similarly, in order to ensure that the tension fitting 130 is subjected to uniform force, the tension fitting 130 also has a symmetrical structure, and the symmetry axis of the tension fitting 130 coincides with the symmetry axis of the first tension connecting plate 131 .

[0053] Of course, in other embodiments, the number of the first mounting holes 1221 provided on the wire hanging plate 122 may also be three, four or more, which is not limited here.

[0054] Referring to Figures 2 to 5, in order to achieve the connection between the jumper connector 123 and the hanging wire fitting string 140, a second mounting hole 1231 is also provided on the jumper connector 123 for connecting the hanging wire fitting string 140. Similar to the first mounting hole 1221, the number of second mounting holes 1231 provided on the jumper connector 123 can be one, two or more, and there is no restriction here.

[0055] The connecting portion 121 , the wire hanging plate 122 , and the jumper connector 123 may be integrally formed, or may be connected together by welding or other methods.

[0056] Continuing with FIG1 , in one embodiment, each composite crossarm 100 includes two insulators 110 , specifically a post insulator 111 and a diagonal insulator 112 . The high-voltage end 111a of the post insulator 111 and the high-voltage end 112a of the diagonal insulator 112 are connected together, while the low-voltage end 111b of the post insulator 111 and the low-voltage end 112b of the diagonal insulator 112 are connected to two different locations on the tower body 11 . This creates a stable triangular structure for the composite crossarm 100 , ensuring its stability. The diagonal insulator 112 is located above the post insulator 111 .

[0057] Referring to Figures 3 and 5 , the outer surface of the connecting portion 121 is also provided with a connecting lug 128 for connecting to the diagonal insulator 112. The connecting lug 128 is located at the top of the connecting portion 121, between the two cable hanger plates 122. The connecting lug 128 has a connection hole provided therein for connecting to the diagonal insulator 112. Thus, the high-voltage end 111a of the post insulator 111 and the high-voltage end 112a of the diagonal insulator 112 are connected together via the end fitting 120, forming the end 100a of the composite crossarm 100 for hanging the transmission line.

[0058] In other embodiments, the number of post insulators and diagonal insulators can also be multiple, and this application does not limit the number of post insulators and diagonal insulators. The structure of the end fittings can be designed to match the structure.

[0059] For example, there are two post insulators and one diagonal insulator, and the diagonal insulator is located on the same side of the two post insulators. The arrangement of the two post insulators and the one diagonal insulator creates a stable triangular structure between the composite cross-arm and the tower body of the transmission tower, which can greatly improve the stability of the composite cross-arm. At this time, the installation heights of the two post insulators are the same, the two post insulators are arranged in a V shape, and the diagonal insulator is located above the two post insulators.

[0060] For another example, there are two post insulators and two diagonal insulators, each located on the same side of the two post insulators and adjacent to each other. The arrangement of the two post insulators and the two diagonal insulators creates a stable triangular structure between the composite crossarm and the tower body, significantly improving the stability of the composite crossarm. In this case, the two post insulators and the two diagonal insulators are installed at the same height, and both diagonal insulators are located above the two post insulators.

[0061] Continuing with Figure 1 , in one embodiment, two composite crossarms 100 are disposed at the same height on the tower body 11 of the transmission tower 10. These two composite crossarms 100 are symmetrically distributed about the axis of the tower body 11, with their axes co-aligned. These two symmetrically distributed composite crossarms 100 form a set of composite crossarm assemblies. The composite crossarm assemblies, located away from the ends of the tower body 11, form two ends for hanging transmission lines, one for hanging two first transmission lines 101. Three sets of composite crossarm assemblies are sequentially disposed on the tower body 11 from bottom to top, forming six ends for hanging transmission lines. Six first transmission lines 101 can be hung, meaning that the transmission tower 10 can be used to hang dual-circuit transmission lines.

[0062] Referring to Figure 6, in another embodiment, six composite crossarm assemblies are arranged sequentially from bottom to top on the tower 21 of a transmission tower 20, forming twelve end locations for hanging transmission lines. Twelve primary transmission lines 201 can be hung on the tower 20, meaning that the tower 20 can be used to hang four-circuit transmission lines. Compared to traditional iron crossarms, the composite crossarms used in this embodiment for four-circuit transmission lines on the same tower can effectively reduce line corridor width, significantly lower tower height, increase tower transmission capacity, and enhance line reliability, which is of great significance to the development of power transmission projects.

[0063] Of course, in other embodiments, the tower body of the transmission tower may also have other numbers of composite cross arms, and may be used to connect a single-circuit transmission line or multiple-circuit transmission lines, which is not limited here.

[0064] In another embodiment, referring to FIG7 , a transmission tower 30 includes a tower body 31, a ground wire support 310, a jumper string 320, a strain insulator string 330, and a composite crossarm 300. The ground wire support 310 is disposed at the top of the tower body 31. The jumper string 320 is vertically suspended from the end of the ground wire support 310 away from the tower body 31. The strain insulator string 330 is disposed on the tower body 31 and below the jumper string 320. Jumpers are suspended between the strain insulator string 330 and the jumper string 320. The composite crossarm 300 is disposed below the strain insulator string 330. The ends of the strain insulator string 330 and the composite crossarm 300 away from the tower body 31 are both used to hang transmission lines. Specifically, the ground wire support 310, the jumper string 320, the strain insulator string 330, and the composite crossarm 300 are disposed in this order from top to bottom on the tower body 31.

[0065] The specific structure of the composite crossarm 300 is identical to that of the aforementioned composite crossarm 100 and will not be further described. A first power transmission line 301 is suspended from the end 300a of the composite crossarm 300. Along the extension direction of the first power transmission line 301, the first power transmission line 301 is disconnected on either side of the tower 31. The first power transmission lines 301 on either side of the tower 31 are fixedly connected to the end 300a of the composite crossarm 300. The first power transmission lines 301 on either side of the tower 31 are electrically connected via a first jumper 302. The details are similar to those described above and will not be further described.

[0066] As shown in Figures 8 and 9 , the strain insulator string 330 includes two strain insulators 331, a first fixing fixture 332, and a second fixing fixture 333. The two strain insulators 331 are arranged in parallel. One end of each strain insulator 331 is fixedly connected to the tower body 31 via the first fixing fixture 332, and the other end is connected to the transmission line via the second fixing fixture 333. In this embodiment, the transmission line connected by the strain insulator string 330 is defined as the second transmission line 303, and the jumper connected between the strain insulator string 330 and the jumper string 320 is defined as the second jumper 304.

[0067] Two tension insulator strings 330 are symmetrically distributed on both sides of the tower body 31 along the extension direction of the second transmission line 303. Along the extension direction of the second transmission line 303, the second transmission line 303 is disconnected on both sides of the tower body 31. The second transmission lines 303 on both sides of the tower body 31 are respectively hung on the ends of the tension insulator 331 away from the tower body 31 through second fixing hardware 333. The second transmission lines 303 on both sides of the tower body 31 are electrically connected through a second jumper 304.

[0068] 8 , the first fixing fixture 332 includes a first coupling plate 3321, a first adjusting fixture 3322, and a second adjusting fixture 3323. The first coupling plate 3321 is connected to the tower body 31 at one end near the tower body 31 via the first adjusting fixture 3322, and its other end is fixedly connected to the two tension insulators 331 via the second adjusting fixture 3323.

[0069] The first connecting plate 3321 is a triangular connecting plate. Three third mounting holes are defined at each of the three corners of the first connecting plate 3321. The third mounting hole at one corner is connected to the first adjustment fitting 3322, while the third mounting holes at the other two corners are connected to the second adjustment fittings 3323, which are then connected to the tension insulator 331 via the second adjustment fittings 3323. In this embodiment, the first connecting plate 3321 is an isosceles triangle. In other embodiments, the first connecting plate may also have any other triangular plate shape, which will not be described in detail here.

[0070] The first adjustment fittings 3322 include several U-shaped fittings and annular fittings. In this embodiment, two U-shaped fittings and one annular fitting are provided, with the two U-shaped fittings being positioned at both ends of the annular fitting. In other embodiments, the number of U-shaped fittings and the number of annular fittings can be adjusted based on actual usage. One end of the first connecting plate 3321 is fixedly connected to the tower body 31 in an adjustable manner.

[0071] The second adjustment fitting 3323 includes two Z-shaped hanging plates, one end of which is connected to the third mounting holes at two corners of the first connecting plate 3321, and the other end is fixedly connected to the two tension insulators 331. Depending on the actual usage, the Z-shaped hanging plates can be of different lengths to adjust the distance between the tension insulators 331 and the tower body 31.

[0072] In other embodiments, the second adjustment fitting may be eliminated, and the tension insulator may be directly fixed to the first connecting plate via fasteners or other means, depending on actual usage, without limitation.

[0073] 9 , the second fixing fixture 333 includes a second coupling plate 3331 and a third adjusting fixture 3332 . One end of the second coupling plate 3331 close to the tower body 31 is directly fixedly connected to the tension insulator 331 , and the other end is adjustable and connected to the second transmission line 303 through the third adjusting fixture 3332 .

[0074] The second connecting plate 3331 is a triangular connecting plate. Three fourth mounting holes are defined at the three corners of the second connecting plate 3331. Two fourth mounting holes at two corners are connected to two tension insulators 331, respectively. The fourth mounting hole at the other corner is connected to a third adjustment fitting 3332, through which the second transmission line 303 is attached. In this embodiment, the second connecting plate 3331 is an isosceles triangle. In other embodiments, the second connecting plate may also have any other triangular shape, which will not be described in detail here.

[0075] The third adjusting hardware 3332 includes a Z-shaped hanging plate, a DB-shaped adjustment plate 3333, a U-shaped hardware and a ring-shaped hardware connected in sequence, wherein one end of the Z-shaped hanging plate is connected to the fourth mounting hole at one of the top corners of the second connecting plate 3331, and the other end is connected to the DB-shaped adjustment plate 3333. The DB-shaped adjustment plate 3333 is fan-shaped as a whole and is provided with a plurality of arc-shaped mounting portions 3334. The U-shaped hardware is selectively connected to one of the mounting portions 3334, so that the third adjusting hardware 3332 can be connected to the second transmission line 303 in an adjustable position.

[0076] In order to install the second jumper 304, a jumper string 320 is provided at the top of the tower body 31 to support the second jumper 304. Specifically, two ground wire brackets 310 are provided at the top of the tower body 31. The ground wire brackets 310 are wedge-shaped and symmetrically arranged on both sides of the tower body 31. A fixing portion 340 is provided at the top of the tower body 31. One end of the ground wire bracket 310 is fixedly connected to the tower body 31 through the fixing portion 340, and the other end is connected to the jumper string 320. The fixing portion 340 includes a connecting plate 341 and a plurality of reinforcing plates 342. One side of the connecting plate 341 is connected to the outer peripheral surface of the tower body 31. A plurality of reinforcing plates 342 are connected between the connecting plate 341 and the tower body 31, making the structure of the fixing portion 340 more stable.

[0077] Referring to Figure 10, the jumper string 320 includes two jumper insulators 321, a third fixing hardware 322 and a hanging hardware 323. The two jumper insulators 321 are arranged in parallel. One end of the two jumper insulators 321 is fixedly connected to the ground wire bracket 310 through the third fixing hardware 322, and the other end is hung with a second jumper 304 through the hanging hardware 323. The second jumper 304 is electrically connected to the second transmission line 303 located on both sides of the tower body 31.

[0078] The third fixing fixture 322 is similar in structure to the first fixing fixture 332 , except that the first adjusting fixture of the third fixing fixture 322 is connected to the grounding bracket 310 , and the second adjusting fixture of the third fixing fixture 322 is connected to the jumper insulator 321 .

[0079] The wire hanging fitting 323 includes a fourth adjustment fitting and a wire hanging clamp. One end of the fourth adjustment fitting is connected to the end of the jumper insulator 321 away from the ground wire bracket 310, and the other end is connected to the wire hanging clamp to hang the second jumper 304. Depending on actual use, the fourth adjustment fitting can be selected of different lengths to adjust the hanging height of the second jumper 304.

[0080] This embodiment utilizes jumper strings 320 on the upper phase and composite crossarms 300 on the lower phase to connect the three-phase conductors. This eliminates the composite crossarms on the upper phase, making the tension tower 30 simpler and easier to install. In other embodiments, different numbers of composite crossarms and jumper strings can be installed on the tower to connect transmission lines of different circuits.

[0081] In summary, the composite crossarm of the present application is used for a tension tower, and the composite crossarm includes at least one insulator, and the high-voltage end of at least one insulator is connected together through an end fitting to form a composite crossarm for hanging the end of a transmission line, and the end fitting can be set to a single hanging point (a first mounting hole is set on the tension fitting) or a double hanging point (two first mounting holes are set on the tension fitting), which can achieve the following technical effects: 1) Ensure normal design and three-span design considerations, ensure that the composite crossarm is uniformly stressed, reduce the difficulty of installing the composite crossarm, and save installation time and cost; 2) Reduce the processing accuracy of the composite crossarm; 3) Reduce the distance between conductor layers, shorten the corridor width, compress the tower head size, and improve the electric field distribution and electromagnetic environment of the tension tower; 4) Reduce the conductor load and tower head wind load, reduce the tower weight and foundation force; 5) Solve the problem of applying traditional tension towers in areas with limited corridors and high land acquisition requirements; 6) Reduce the investment and operation and maintenance costs of the transmission line body and the entire life cycle, and achieve maintenance-free operation throughout the entire life cycle.

[0082] The above description is only an implementation method of the present application and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the description and drawings of this application, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A transmission tower, characterized in that: It includes a tower body and a composite crossarm arranged on the tower body, the composite crossarm includes at least one insulator and an end fitting, the end fitting is connected to the high-voltage end of the insulator to form the composite crossarm for hanging the end of the first transmission line, the end fitting includes a connecting part, the connecting part is provided with two hanging plates and a jumper connector, the two hanging plates are distributed on both sides of the connecting part along the extension direction of the first transmission line, and the first jumper is electrically connected to the first transmission line located on both sides of the tower body and hung on the jumper connector.

2. The transmission tower according to claim 1, characterized in that: The connecting portion is cylindrical.

3. The transmission tower according to claim 2, characterized in that: The wire hanging plate and the jumper connector are both connected to the outer periphery of the connecting portion.

4. The transmission tower according to claim 2, characterized in that: A first connecting plate and a second connecting plate are also provided at both ends of the connecting portion. The first connecting plate covers one end of the end fitting away from the insulator, and the second connecting plate extends outward from the other end of the connecting portion along the radial direction of the connecting portion to form a fully enclosed structure.

5. The transmission tower according to claim 4, characterized in that: The first connecting plate and the second connecting plate are both provided with construction holes.

6. The transmission tower according to claim 1, characterized in that: The transmission tower also includes a tension fitting, a first mounting hole is provided on the hanging plate, one end of the tension fitting is fixedly connected to the first mounting hole, and the other end is used to hang the first transmission line.

7. The transmission tower according to claim 6, characterized in that: The tension fittings include a first tension connecting plate, a second tension connecting plate and two first tension connecting members, the first tension connecting plate and the second tension connecting plate are arranged at intervals, one end of the two first tension connecting members are connected to the first tension connecting plate, and the other end are connected to the second tension connecting plate.

8. The transmission tower according to claim 6, characterized in that: The tension fittings include a first tension connecting plate, two first tension connecting members and two second tension connecting members, the two second tension connecting members correspond one-to-one to the two first tension connecting members, and the two second tension connecting members are connected to the first tension connecting plate through their respective corresponding first tension connecting members.

9. The transmission tower according to claim 1, characterized in that: The jumper connector is located at the bottom of the connecting portion, and the jumper connector is located between the two hanging wire boards. A hanging wire hardware string is hung on the jumper connector for hanging the first jumper.

10. The transmission tower according to claim 1, characterized in that: Two composite cross arms are arranged at the same height on the tower body, the two composite cross arms are axially symmetrically distributed relative to the axis of the tower body, and the axes of the two composite cross arms are located on the same straight line, thereby forming a composite cross arm assembly. Three groups of composite cross arm assemblies are arranged in sequence from bottom to top on the tower body for hanging double-circuit transmission lines.

11. The transmission tower according to claim 1, characterized in that: Two composite cross-arms are arranged at the same height on the tower body, the two composite cross-arms are axially symmetrically distributed relative to the axis of the tower body, and the axes of the two composite cross-arms are located on the same straight line, thereby forming a composite cross-arm assembly. Six groups of composite cross-arm assemblies are arranged in sequence from bottom to top on the tower body for hanging four-circuit transmission lines.

12. The transmission tower according to claim 1, characterized in that: The transmission tower also includes a ground wire support, a jumper string and a tension insulator string. The ground wire support is arranged at the top of the tower body. The jumper string is vertically hung at the end of the ground wire support away from the tower body. The tension insulator string is arranged on the tower body and located below the jumper string. A second jumper is hung between the tension insulator string and the jumper string. The composite crossarm is located below the tension insulator string. The end of the tension insulator string away from the tower body is used for hanging a second transmission line.

13. The transmission tower according to claim 12, characterized in that: The strain insulator string includes two strain insulators, a first fixing hardware and a second fixing hardware. The two strain insulators are arranged in parallel, one end of the two strain insulators is fixedly connected to the tower body through the first fixing hardware, and the other end is hung with the second transmission line through the second fixing hardware.

14. The transmission tower according to claim 13, characterized in that: The two tension insulator strings are provided with two, and the two tension insulator strings are symmetrically distributed on both sides of the tower body along the extension direction of the second transmission line.

15. The transmission tower according to claim 13, characterized in that: The first fixing hardware includes a first connecting plate, a first adjusting hardware and a second adjusting hardware. One end of the first connecting plate close to the tower body is connected to the tower body through the first adjusting hardware, and the other end is fixedly connected to the tension insulator through the second adjusting hardware.

16. The transmission tower according to claim 13, characterized in that The second fixing hardware includes a second connecting plate and a third adjusting hardware. One end of the second connecting plate close to the tower body is directly fixedly connected to the tension insulator, and the other end is connected to the second transmission line in an adjustable position through the third adjusting hardware.

17. The transmission tower according to claim 16, characterized in that: The third adjusting hardware includes a DB-type adjustment plate and a U-type hardware. The DB-type adjustment plate is provided with a plurality of mounting parts arranged in an arc shape. The U-type hardware is selectively connected to one of the mounting parts.

18. The transmission tower according to claim 12, characterized in that: A fixing part is provided on the top of the tower body, one end of the ground wire bracket is fixedly connected to the tower body through the fixing part, and the other end is connected to the jumper string.

19. The transmission tower according to claim 13, characterized in that: The jumper string includes two jumper insulators, a third fixing hardware and a hanging wire hardware. The two jumper insulators are arranged in parallel. One end of the two jumper insulators is fixedly connected to the ground wire bracket through the third fixing hardware, and the other end is used to hang the second jumper through the hanging wire hardware.

20. The transmission tower according to claim 19, characterized in that The second jumper is electrically connected to the second transmission line located on both sides of the tower body.

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