CN213980169U - Composite material cross arm tower - Google Patents
Composite material cross arm tower Download PDFInfo
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- CN213980169U CN213980169U CN202021841151.7U CN202021841151U CN213980169U CN 213980169 U CN213980169 U CN 213980169U CN 202021841151 U CN202021841151 U CN 202021841151U CN 213980169 U CN213980169 U CN 213980169U
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Abstract
The utility model provides a composite material cross arm tower, which comprises a tower footing, a tower main body and a line bracket; the tower footing supports the tower main body; the tower main body comprises four supporting rods and connecting rods connected among the supporting rods; the circuit support is arranged at the top of the tower main body; two support rods on one side of the composite cross arm tower are connected with a composite cross arm group, and two support rods on the other side of the composite cross arm tower are connected with another composite cross arm group; the composite cross arm group comprises a first horizontal insulator, a second horizontal insulator, a first cable-stayed outer insulator, a second cable-stayed outer insulator, a first cable-stayed inner insulator and a second cable-stayed inner insulator. The utility model discloses having optimized shaft tower lectotype, structural arrangement, node structure, having carried out analysis calculation and optimal design to aspects such as mechanized construction, can guiding engineering design, reduce the engineering investment.
Description
Technical Field
The utility model relates to a power transmission tower technical field, concretely relates to combined material cross arm shaft tower.
Background
With the high-speed development of urban construction, land becomes an increasingly scarce resource, and the selection of a line corridor becomes a first difficult problem for the construction of a power transmission line. The great improvement of people's consciousness to environment and self-protection for transmission line becomes very difficult in the aspects such as policy processing, removal and arrangement, saving corridor. The land requirement of China is continuously increased, land resources are increasingly scarce, however, the existing transmission line pole tower which needs to support a 500kV double-loop transmission line is generally manufactured by adopting angle steel, insulator strings are connected at two ends of the angle steel, and the transmission line is suspended by utilizing the insulator strings; in order to ensure the insulation between transmission lines, the widths of corridors of transmission line towers are large, so that the corridor is difficult to clean and the path of the transmission line is difficult to select; especially in economically developed densely populated areas, power construction encounters various resistances due to the lack of corridor resources. The tower path selection may be controlled by the drilling-crossing point of the extra-high voltage line, and needs to be bypassed. In the actual engineering of the tower, the problems that many crossed spanning objects along the engineering line exist, the spanning forest area is long, the line is drilled and spanned and the like exist at the same time are often faced, the design of the tower height is difficult to adapt to the current scene during the crossed spanning, and the engineering investment cost is huge. The tower line path area is often orchard, forest more, and area is reached, and the fruit tree is fell seriously, and single base compensation expense is big, and the single base coordination degree of difficulty is big, and comprehensive cost is high.
SUMMERY OF THE UTILITY MODEL
The utility model provides a composite material cross arm tower, which comprises a tower footing, a tower main body (10) and a line bracket (20); the foundation supporting the tower body (10); the tower main body (10) comprises four supporting rods and connecting rods connected among the supporting rods; the line support (20) is arranged at the top of the tower main body (10); two support rods at one side of the composite material cross arm tower are connected with a composite material cross arm tower bearing component, and two support rods at the other side of the composite material cross arm tower are connected with another composite material cross arm tower bearing component; the composite material cross arm tower bearing component comprises a first horizontal insulator (31), a second horizontal insulator (32), a first diagonal outer insulator (41) and a second diagonal outer insulator (42); one end of the first horizontal insulator (31) and one end of the first cable-stayed outer insulator (41) are connected to the same supporting rod, and one end of the second horizontal insulator (32) and one end of the second cable-stayed outer insulator (42) are connected to the other supporting rod; the other ends of the first horizontal insulator (31), the second horizontal insulator (32), the first diagonal outer insulator (41) and the second diagonal outer insulator (42) are connected together through an end node device (70); a suspension fitting string (60) is hung at the connecting end of the first horizontal insulator (31), the second horizontal insulator (32), the first diagonal outer insulator (41) and the second diagonal outer insulator (42); the first horizontal insulator (31), the second horizontal insulator (32), the first diagonal outer insulator (41), the second diagonal outer insulator (42), the first diagonal inner insulator (51) and the second diagonal inner insulator (52) are sleeved with silicon rubber sheaths; the calculation formula of the distance between the horizontal lines of the composite cross arm tower is as follows:
wherein ki is the coefficient of the suspension insulator string;
d is the distance between horizontal wires of the conducting wires;
lk is the length of the suspension insulator string;
u is the system nominal voltage;
fc is the maximum sag of the wire;
the calculation formula of the distance between the conducting wire and the ground is as follows:
S≥0.012L+1 (2.2)
wherein S is the distance between the conducting wire and the ground;
l is the span.
In an improved scheme, the composite material cross arm tower bearing component further comprises a first diagonal inner insulator (51) and a second diagonal inner insulator (52); the first horizontal insulator (31) and the second horizontal insulator (32) are both provided with middle node devices (80); the first diagonal inner insulator (51) is connected between the support rod and a middle node device (80) of the first horizontal insulator (31); the second diagonal inner insulator (52) is connected between the support rod and a middle node device (80) of the second horizontal insulator (32); and a cross insulator (33) is also connected between the middle node device (80) of the first horizontal insulator (31) and the middle node device (80) of the second horizontal insulator (32).
In an improved scheme, the composite material of the cross bar is glass fiber epoxy resin-based reinforced plastic, a high-strength high-modulus glass fiber reinforced composite material or a borosilicate glass fiber reinforced resin-based composite material.
In an improved scheme, the wire adopts 2 XJL 3/LHA5-210/220 extra-high conductivity aluminum alloy core aluminum stranded wires, horizontal double splitting is carried out, and the splitting distance is 400 mm; one of the ground wires adopts JLB40-120 type aluminum-clad steel stranded wires, and the other one adopts 24-core OPGW-120 type optical cables.
In an improved scheme, the length of the suspension fitting string (60) is 0.5-0.7 m.
In a modified scheme, the breath height dimension of the composite material cross arm tower is 27 m; the height of a hanging point of the ground wire is 38.7 m; the height of the hanging point of the upper conducting wire is 32.5 m; the height of the hanging point of the lower phase conductor is 27.0 m.
In a modified scheme, the support rod is internally provided with a filler, and the surface of the support rod is provided with a coating layer.
In a refinement, the coating layer is made of an alicyclic epoxy resin; the filler is light foam.
In an improved scheme, the tower main body (10) is a steel structure tower body, and main materials and auxiliary materials of the tower body are steel pipes.
The utility model discloses a double-circuit triangle is arranged double-phase compound cross arm tangent tower can overcome the alternately spanning object along the line of engineering more, the spanning forest district is longer, have the circuit simultaneously and bore the leap scheduling problem, has reduced the tower height when alternately spanning to reduce the engineering investment. The utility model discloses having optimized shaft tower lectotype, structural arrangement, node structure, having carried out analysis calculation and optimal design to aspects such as mechanized construction, can guiding engineering design, reduce the engineering investment.
Drawings
Fig. 1 is a schematic structural view of a composite cross arm tower according to the first embodiment;
fig. 2 is a schematic structural view of a composite cross-arm tower bearing member in the first embodiment;
fig. 3 is a schematic structural view of a composite cross-arm tower bearing member in the first embodiment;
fig. 4 is a schematic structural view of the composite cross-arm tower load-bearing member of the second embodiment.
Reference numerals: the tower comprises a tower main body 10, a line support 20, a first horizontal insulator 31, a second horizontal insulator 32, a cross insulator 33, a first diagonal outer insulator 41, a second diagonal outer insulator 42, a first diagonal inner insulator 51, a second diagonal inner insulator 52, a suspension fitting string 60, an end node device 70 and a middle node device 80.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings. Wherein like elements in different embodiments are numbered with like associated elements. In the following description, numerous specific details are set forth in order to provide a better understanding of the present invention. However, those skilled in the art will readily recognize that some of the features may be omitted or replaced with other elements, materials, methods in different instances. In some cases, operations related to the present invention are not shown or described in the specification, so as to avoid the core part of the present invention being overwhelmed by excessive description, and it is not necessary for those skilled in the art to describe these related operations in detail, and they can fully understand the related operations according to the description in the specification and the general knowledge in the art.
Furthermore, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments. Also, the various steps or actions in the method descriptions may be transposed or transposed in order, as will be apparent to one of ordinary skill in the art. Thus, the various sequences in the specification and drawings are for the purpose of describing certain embodiments only and are not intended to imply a required sequence unless otherwise indicated where such sequence must be followed.
The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connect" or "connect" as used herein includes both direct and indirect connections (connections), unless otherwise specified.
The first embodiment is as follows:
in the transmission line, the type of the tower is various. According to the stress characteristics, the tower can be divided into a straight line tower, a straight line corner tower and a strain corner tower; can be divided into a guyed tower and a free-standing tower according to the supporting mode; the material can be divided into a cement pole, a steel pipe pole, an angle steel tower, a steel pipe tower and a reinforced concrete tower. The tower type actually used in the engineering is determined by combining specific engineering to carry out comprehensive comparison of technology and economy, and the principle is that the safe operation of a line is guaranteed, and the line is economical and reasonable.
Fig. 1 shows a composite cross-arm tower of the present embodiment, which includes a tower base, a tower main body 10 and a line support 20; the foundation supports the tower body 10; the tower body 10 includes four support rods and connecting rods connected between the respective support rods. The line support 20 is arranged at the top of the tower main body 10, specifically, the line support 20 is a ground wire support, and the composite cross arm tower is a double-loop triangular arrangement two-phase composite cross arm tangent tower.
Two support rods on one side of the composite material cross arm tower are connected with a composite cross arm group, and two support rods on the other side of the composite material cross arm tower are connected with another composite cross arm group. As shown in fig. 2 and 3, the composite cross arm assembly includes a first horizontal insulator 31, a second horizontal insulator 32, a first diagonal outer insulator 41, a second diagonal outer insulator 42, a first diagonal inner insulator 51, and a second diagonal inner insulator 52. One ends of the first horizontal insulator 31 and the first diagonal outer insulator 41 are connected to the same support rod, and one ends of the second horizontal insulator 32 and the second diagonal outer insulator 42 are connected to the other support rod. The other ends of the first horizontal insulator 31, the second horizontal insulator 32, the first diagonal outer insulator 41 and the second diagonal outer insulator 42 are connected together by an end node means 70.
A middle node device 80 is arranged on each of the first horizontal insulator 31 and the second horizontal insulator 32. The first diagonal inner insulator 51 is connected between the support rod and the middle node device 80 of the first horizontal insulator 31; the second diagonal inner insulator 52 is connected between the support rod and the middle node means 80 of the second horizontal insulator 32. A cross insulator 33 is also connected between the middle node means 80 of the first horizontal insulator 31 and the middle node means 80 of the second horizontal insulator 32.
The first horizontal insulator 31 and the second horizontal insulator 32 intersect each other in a V-shape on the same plane. The projections of the first horizontal insulator 31, the first diagonal outer insulator 41 and the first diagonal inner insulator 51 on the horizontal plane are superposed; the projections of the second horizontal insulator 32, the second diagonal outer insulator 42 and the second diagonal inner insulator 52 on the horizontal plane coincide. The included angles between the first horizontal insulator 31 and the second horizontal insulator 32, and between the first diagonal outer insulator 41 and the second diagonal outer insulator 42 are 30 to 60 degrees.
First horizontal insulator 31 and second horizontal insulator 32 are connected to end node means 70 by cross-plug connectors, respectively, and are connected to support rods by cross-plugs via steel plates, respectively. The first and second diagonal outer insulators 41 and 42 are connected to the end node device 70 by U-ring connectors, respectively. The cross-section of the first horizontal insulator 31 and the second horizontal insulator 32 is cross-shaped. The cross sections of the first diagonal outer insulator 41, the first diagonal inner insulator 51, the second diagonal outer insulator 42 and the second diagonal inner insulator 52 are circular. According to the design scheme of the embodiment, the composite cross arm is formed by a mode of supporting a stay cable by a triangular structure with definite force transmission, the structure is simple, the lower plane of the cross arm is formed by two groups of post insulators at a certain included angle to form a triangular support, and the end part of the cross arm is a metal piece; the stay cable adopts composite insulator to connect cross arm end and body of the tower, and the middle part of the cross arm adopts composite member to support. The components of the composite cross arm mainly bear axial load, and the overall stability problem of the composite cross arm is more prominent than that of steel components due to the low elastic modulus of the composite material, so that the cross section of the selected component is developed and the wall thickness of the selected component is thin, the inertia moment of the cross section of the selected component is as large as possible, and the stable bearing capacity of the component is improved. The cross section of the composite material pultrusion section bar can be designed into various shapes according to requirements, and the common shapes mainly comprise an L shape, an O shape, an □ shape and the like; the composite cross arm has the advantages of maximum inertia moment of the circular and square sections, maximum integral stable bearing capacity, convenient manufacture of the composite material tubular component and convenient connection, and can adopt the post insulator with the circular or square section as a main bearing component.
For a 220kV transmission line tower, the stress of a rod piece is large, the requirement on the bearing capacity cannot be met by adopting a single glue joint connection mode, and the stress concentration is easily caused by adopting single mechanical connection to cause the cracking and the damage of a component. The common scheme is that glue-screw or glue-rivet mixed connection can be adopted. Although the connection mode has the advantages of enhancing the connection reliability of the nodes, effectively controlling the deformation of the nodes, avoiding fatigue failure and the like, the structure is complex, the nodes are single and heavy, and the application economy of the composite tower is seriously influenced. In the embodiment, interference fit connection is adopted, and on the general clearance mechanical connection mode, a certain interference amount is applied to the connecting member, and the modulus ratio and the friction coefficient between the hole wall and the fastener are adjusted to achieve better connection strength. Joints connected by fasteners are generally weak links of structural stress. When the connected piece is stressed by load, high stress concentration can be generated in a certain range near the hole.
Suspension fitting strings 60 are hung at the connecting ends of the first horizontal insulator 31, the second horizontal insulator 32, the first cable-stayed outer insulator 41 and the second cable-stayed outer insulator 42. Specifically, the upper end of the suspension fitting string 60 is connected to the end node device 70, the lower end is connected to the lead, and the length of the suspension fitting string 60 is 0.5-0.7 m.
Because the composite cross arm is an insulator, a suspension insulator string is not needed between the conducting wire and the cross arm, so that the windage yaw discharge fault of the tower head can be eliminated, and the sizes of the cross arm and the tower head are reduced. For a high-voltage grade transmission line adopting split conductors, in addition to the requirement of insulation, longitudinal unbalanced tension generated by deicing or sub-conductor disconnection is also required to be considered during tower design, and if a suspension insulator string is cancelled, the component specifications of cross arms and a tower body are required to be increased due to split conductor longitudinal unbalanced tension control, so that the high-voltage grade transmission line is not economical. Therefore, the length of the suspension fitting string of the composite cross arm is determined according to the checking result of the wire breakage tension (or the split wire longitudinal unbalance tension).
The utility model discloses in, the perpendicular split interval of wire is 400mm, and the gold utensil cluster that dangles is long 500mm, and the perpendicular distance of the upper and lower layer wire of two return circuits triangle arrangement lower floor combined material cross arm tangent towers is 5.5m, and the distance between upper and lower layer cross arm is 7.5 m. The technical scheme of the utility model than ordinary 220kV two return circuits vertical arrangement drum type tower head height reduced 5.5m, insulator length has reduced 8 m.
The distance between the lower layer composite cross arm conductor and the tower body is selected according to the requirement of meeting the composite cross arm creepage distance, and the distance is 2.8m in the embodiment; the distance between the two phases is selected according to the distance requirement between the horizontal lines, and the distance between the two phases is 5.2m in the embodiment. The width of the corridor on one side is 9m, which is increased by 1.5m compared with the common 220kV double-loop vertical drum-type tower corridor.
The tower main body 10 is a steel structure tower body, and the main material and the auxiliary material of the tower body are steel pipes. The tower body of the composite material cross arm tower can adopt a traditional steel structure, the cross arm part adopts a composite material (FRP) structure, the triangular arrangement is the best structural style from the aspects of structural modeling and stress, the structure is simple, the modeling is uniform, the design, the construction and the maintenance are also more convenient, and the verification is well carried out in a plurality of line projects. The triangular arrangement of the conductor arrangement makes the design and construction simpler. The support rod is filled with filler and has a coating layer on the surface. For example, the coating layer is made of an alicyclic epoxy resin, and the filler is a lightweight foam.
The composite cross arm adopts insulation matching, so that the circuit can safely and reliably run under various conditions such as power frequency voltage, operation overvoltage, lightning overvoltage and the like, and the insulation matching design can adopt a creepage ratio distance method and a pollution-withstand voltage method to select proper insulation configuration parameters. The first cable-stayed outer insulator 41, the second cable-stayed outer insulator 42, the first cable-stayed inner insulator 51 and the second cable-stayed inner insulator 52 are made of flexible materials; the first horizontal insulator 31 and the second horizontal insulator 32 are made of rigid materials. Specifically, the composite material of the cross bar is glass fiber epoxy resin-based reinforced plastic, a high-strength high-modulus glass fiber reinforced composite material or a borosilicate glass fiber reinforced resin-based composite material, and preferably, the wall thickness of the composite material of the cross arm is less than 7.5 mm.
The first horizontal insulator 31, the second horizontal insulator 32, the first diagonal outer insulator 41, the second diagonal outer insulator 42, the first diagonal inner insulator 51 and the second diagonal inner insulator 52 are also sleeved with silicone rubber sheaths.
The lead adopts 2 XJL 3/LHA5-210/220 extra-high conductivity aluminum alloy core aluminum stranded wires, and has horizontal double splitting with the splitting distance of 400 mm; one of the ground wires adopts JLB40-120 type aluminum-clad steel stranded wires, and the other one adopts 24-core OPGW-120 type optical cables.
The breath height dimension of the composite material cross arm tower is 27 m; the height of a hanging point of the ground wire is 38.7 m; the height of the hanging point of the upper conducting wire is 32.5 m; the height of the hanging point of the lower phase conductor is 27.0 m.
In this embodiment, the calculation formula of the total creepage distance of the composite cross arm is:
the composite cross arm creep distance is the composite cross arm creep distance at the altitude of 1000m, lambda is the creep specific distance (cm/kV), U is the system nominal voltage (kV), and Ke is the effective coefficient of the composite cross arm creep distance, is generally related to the umbrella-shaped structure and the type, and is determined according to the effectiveness of dirt withstand voltage in tests and operation.
The composite insulating cross arm insulating configuration parameters meeting the requirements of the present embodiment can be shown in the following table, for example.
TABLE 1 composite insulation Cross arm insulation configuration parameters
| Nominal voltage (kV) | 220 |
| Composite cross arm structure height (mm) | 2800 (phase to ground) |
| Composite cross arm structure height (mm) | 5000 (alternate) |
| Nominal creepage distance (mm) | 7480 (e-level dirt zone) |
| Minimum arc distance (mm) | 1900 |
The calculation formula of the distance between the horizontal lines of the composite material cross arm tower is as follows:
wherein k isiCoefficient of suspension insulator string, D is horizontal line-to-line distance of conductor, LkFor the length of the suspension insulator string, U is the system nominal voltage, fcThe maximum sag of the wire;
the calculation formula of the distance between the conducting wire and the ground is as follows:
S≥0.012L+1 (2.2)
wherein S is the distance between the conducting wire and the ground, and L is the span.
The minimum inter-line distance of the composite material cross arm tower is shown in the following table.
TABLE 2 minimum interline distance between wires
In order to reduce or avoid the flashover accident between wire and wire ground wire, the shaft tower is arranged and should have sufficient vertical spacing and horizontal displacement between wire and wire ground wire, the utility model discloses in, ground wire support height is not less than 3m, and strain insulator tower ground wire support height is not less than 5 m.
Example two:
fig. 1 shows a composite cross-arm tower of the present embodiment, which includes a tower base, a tower main body 10 and a line support 20; the foundation supports the tower body 10; the tower body 10 includes four support rods and a connection rod connected between the support rods; the line bracket 20 is disposed at the top of the tower body 10, and specifically, the line bracket 20 is a ground bracket.
Two support rods on one side of the composite material cross arm tower are connected with a composite cross arm group, and two support rods on the other side of the composite material cross arm tower are connected with another composite cross arm group. As shown in fig. 4, the composite cross arm assembly includes a first horizontal insulator 31, a second horizontal insulator 32, a first cable-stayed outer insulator 41 and a second cable-stayed outer insulator 42. One ends of the first horizontal insulator 31 and the first diagonal outer insulator 41 are connected to the same support rod, and one ends of the second horizontal insulator 32 and the second diagonal outer insulator 42 are connected to the other support rod. The other ends of the first horizontal insulator 31, the second horizontal insulator 32, the first diagonal outer insulator 41 and the second diagonal outer insulator 42 are connected together by an end node means 70.
Suspension hardware strings are hung at the connecting ends of the first horizontal insulator 31, the second horizontal insulator 32, the first cable-stayed outer insulator 41 and the second cable-stayed outer insulator 42.
The difference between this embodiment and the first embodiment is that the first diagonal inner insulator, the second diagonal inner insulator, the middle node device, and the cross insulator are not provided in this embodiment, and other technical features of this embodiment are consistent with those of this embodiment, and therefore are not described again.
In the shaft tower design, single loop tangent tower chooses for use 2B3 module, and single loop corner tower chooses for use 2B5 module, and 2E3 module is chooseed for use to two loop tangent towers, and 2E5 module is chooseed for use to two loop corner towers, the utility model discloses a double-phase compound cross arm tangent tower of two loop triangular arrangement can overcome engineering cross spanning object along the line more, cross over the forest zone longer, have the circuit simultaneously and bore the leap scheduling problem, has reduced the tower height when crossing over alternately to reduce the engineering investment. The utility model discloses having optimized shaft tower lectotype, structural arrangement, node structure, having carried out analysis calculation and optimal design to aspects such as mechanized construction, can guiding engineering design, reduce the engineering investment. The utility model fully considers various engineering landforms, geological characteristics and transportation conditions, compared with the common double-loop drum-shaped tower, the height of the tower head of the utility model is reduced by 5.5m, and the height of the tower head is reduced by 8m by considering the length of the insulator; the tower weight is reduced by about 23% under the same nominal height condition, and the basic acting force is reduced by about 27%. The utility model discloses the wire arrangement is more reasonable, and the wire adopts the pattern of three-phase triangle-shaped range, and its electrical parameter has obtained very big improvement. The occupied area is reduced by about 27 percent, and the tower footing cutting is effectively reduced by arranging the tower footing in the forest land; the comprehensive cost is reduced by about 10%. To the narrow area in corridor, the utility model discloses a three-phase wire can adopt vertical arrangement, and for traditional tangent tower, the tower is exhaled the height and can be reduced 2.5 meters, and the corridor width reduces 4 meters. The double-loop triangular arrangement lower-layer composite cross arm tower type has the advantages of simple structure, easy node treatment, line corridor saving, convenient construction and maintenance and the like.
It is right to have used specific individual example above the utility model discloses expound, only be used for helping to understand the utility model discloses, not be used for the restriction the utility model discloses. To the technical field of the utility model technical personnel, the foundation the utility model discloses an idea can also be made a plurality of simple deductions, warp or replacement.
Claims (9)
1. A composite cross arm tower comprises a tower footing, a tower main body (10) and a line support (20);
the foundation supporting the tower body (10);
the tower main body (10) comprises four supporting rods and connecting rods connected among the supporting rods;
the line support (20) is arranged at the top of the tower main body (10);
it is characterized in that the preparation method is characterized in that,
two support rods at one side of the composite material cross arm tower are connected with a composite material cross arm tower bearing component, and two support rods at the other side of the composite material cross arm tower are connected with another composite material cross arm tower bearing component;
the composite material cross arm tower bearing component comprises a first horizontal insulator (31), a second horizontal insulator (32), a first diagonal outer insulator (41) and a second diagonal outer insulator (42);
one end of the first horizontal insulator (31) and one end of the first cable-stayed outer insulator (41) are connected to the same supporting rod, and one end of the second horizontal insulator (32) and one end of the second cable-stayed outer insulator (42) are connected to the other supporting rod;
the other ends of the first horizontal insulator (31), the second horizontal insulator (32), the first diagonal outer insulator (41) and the second diagonal outer insulator (42) are connected together through an end node device (70);
a suspension fitting string (60) is hung at the connecting end of the first horizontal insulator (31), the second horizontal insulator (32), the first diagonal outer insulator (41) and the second diagonal outer insulator (42);
the first horizontal insulator (31), the second horizontal insulator (32), the first diagonal outer insulator (41), the second diagonal outer insulator (42), the first diagonal inner insulator (51) and the second diagonal inner insulator (52) are sleeved with silicon rubber sheaths;
the calculation formula of the distance between the horizontal lines of the composite cross arm tower is as follows:
wherein ki is the coefficient of the suspension insulator string;
d is the distance between horizontal wires of the conducting wires;
lk is the length of the suspension insulator string;
u is the system nominal voltage;
fc is the maximum sag of the wire;
the calculation formula of the distance between the conducting wire and the ground is as follows:
S≥0.012L+1 (2.2)
wherein S is the distance between the conducting wire and the ground;
l is the span.
2. The composite cross arm tower of claim 1,
the composite material cross arm tower bearing component also comprises a first diagonal inner insulator (51) and a second diagonal inner insulator (52);
the first horizontal insulator (31) and the second horizontal insulator (32) are both provided with middle node devices (80);
the first diagonal inner insulator (51) is connected between the support rod and a middle node device (80) of the first horizontal insulator (31); the second diagonal inner insulator (52) is connected between the support rod and a middle node device (80) of the second horizontal insulator (32);
and a cross insulator (33) is also connected between the middle node device (80) of the first horizontal insulator (31) and the middle node device (80) of the second horizontal insulator (32).
3. The composite cross arm tower of claim 1,
the composite material of the cross bar is glass fiber epoxy resin-based reinforced plastic, high-strength high-modulus glass fiber reinforced composite material or borosilicate glass fiber reinforced resin-based composite material.
4. The composite cross arm tower of claim 1,
the lead adopts 2 XJL 3/LHA5-210/220 extra-high conductivity aluminum alloy core aluminum stranded wires, and has horizontal double splitting with the splitting distance of 400 mm;
one of the ground wires adopts JLB40-120 type aluminum-clad steel stranded wires, and the other one adopts 24-core OPGW-120 type optical cables.
5. The composite cross arm tower of claim 1,
the length of the suspension hardware string (60) is 0.5-0.7 m.
6. The composite cross arm tower of claim 1,
the breath height dimension of the composite material cross arm tower is 27 m;
the height of a hanging point of the ground wire is 38.7 m;
the height of the hanging point of the upper conducting wire is 32.5 m;
the height of the hanging point of the lower phase conductor is 27.0 m.
7. The composite cross arm tower of claim 1,
the support rod is internally provided with a filler, and the surface of the support rod is provided with a coating layer.
8. The composite cross arm tower of claim 7,
the coating layer is made of alicyclic epoxy resin;
the filler is light foam.
9. A composite material cross arm tower as claimed in any one of claims 1 to 8,
the tower main body (10) is a steel structure tower body, and main materials and auxiliary materials of the tower body are steel pipes.
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| CN202021841151.7U CN213980169U (en) | 2020-08-28 | 2020-08-28 | Composite material cross arm tower |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115126325A (en) * | 2022-05-27 | 2022-09-30 | 国网甘肃省电力公司电力科学研究院 | Cat-head tower of overhead transmission line and middle-phase transformation method of cat-head tower |
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2020
- 2020-08-28 CN CN202021841151.7U patent/CN213980169U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115126325A (en) * | 2022-05-27 | 2022-09-30 | 国网甘肃省电力公司电力科学研究院 | Cat-head tower of overhead transmission line and middle-phase transformation method of cat-head tower |
| CN115126325B (en) * | 2022-05-27 | 2024-06-21 | 国网甘肃省电力公司电力科学研究院 | Cat head tower of overhead transmission line and medium phase transformation method of cat head tower |
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