CN212478729U - Two-phase composite cross arm tangent tower - Google Patents
Two-phase composite cross arm tangent tower Download PDFInfo
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- CN212478729U CN212478729U CN202021841066.0U CN202021841066U CN212478729U CN 212478729 U CN212478729 U CN 212478729U CN 202021841066 U CN202021841066 U CN 202021841066U CN 212478729 U CN212478729 U CN 212478729U
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Abstract
The utility model discloses a double-phase compound cross arm tangent tower, including the tower head, the tower head is dry style of calligraphy, the tower head includes cross arm and lower cross arm, go up the cross arm with wire mode of arranging on the cross arm adopts the triangle to arrange and arranges down, the cross arm adopts a set of compound cross arm structure that is a style of calligraphy and arranges down, compares with ordinary two return circuit drum type towers, the utility model discloses double-phase compound cross arm tangent tower head height reduces, exhales the height and reduces, and the tower weight alleviates, and basic effort reduces, and the wire arrangement is more reasonable, and electrical parameter has obtained very big improvement, and area reduces, can effectively reduce the tower footing and fell to reduce the cost.
Description
Technical Field
The utility model relates to a transmission line field especially relates to a double-phase compound cross arm tangent tower.
Background
When cross spanning objects along the engineering construction line are more and the spanning forest area is longer, the traditional double-loop drum-type tower is higher in height, the tower body is made of all steel materials, the tower weight is heavier, and meanwhile, the tower base of the traditional double-loop drum-type tower is larger, more trees need to be cut down, so that the engineering investment is larger.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a double-phase compound cross arm tangent tower, aim at providing one kind and can reduce the tower height and reduce manufacturing cost's double-phase compound cross arm tangent tower.
In order to achieve the above object, the utility model provides a double-phase compound cross arm tangent tower, including the tower head, the tower head is the dry style of calligraphy, the tower head includes cross arm and lower cross arm, go up the cross arm with wire mode of arranging on the cross arm down adopts triangular arrangement to arrange, the cross arm adopts a set of compound cross arm structure that is a style of calligraphy and arranges down.
Preferably, the composite cross arm structure comprises a cross arm insulator, one end of the cross arm insulator is connected to the tower body, the other end of the cross arm insulator is a tail end, and hardware fittings are arranged at the tail end and the middle part of the cross arm insulator and used for erecting a wire.
Preferably, the composite cross arm structure further comprises a cable-stayed insulator, one end of the cable-stayed insulator is connected to the tower body, and the other end of the cable-stayed insulator is connected to the tail end of the cross arm insulator.
Preferably, the cross arm insulator comprises at least two post insulators, which may be connected to each other in a straight line by flanges.
Preferably, the oblique-pulling insulator comprises a group of horizontal oblique-pulling insulators, the horizontal oblique-pulling insulators are arranged in a V shape along the horizontal direction, one end, located at the opening of the V shape, of each horizontal oblique-pulling insulator is connected to the tower body, and the other end of each horizontal oblique-pulling insulator is connected to the tail end of the cross arm insulator.
Preferably, draw the insulator to one side still including a set of being located draw the insulator to one side on the cross arm insulator top, it includes that first go up to draw the insulator to one side and draw the insulator to one side on the second to go up to draw the insulator to one side, it is the V style of calligraphy along the vertical direction and arranges to go up to draw the insulator to one side, the one end that is located V style of calligraphy intersect department of going up to draw the insulator to one side connect in the body of the tower, the one end that is located V style of calligraphy opening part of going up to draw the insulator to one side connect in the cross.
Preferably, the first upper diagonal insulator is connected to a flange near the tower body, and the second upper diagonal insulator is connected to the tail end of the cross arm insulator.
Preferably, the vertical spacing distance between the upper cross arm and the lower cross arm is 7.5m, the vertical spacing distance between the wires on the upper cross arm and the lower cross arm is 5.5m, the distance between the wire on the composite cross arm structure, which is close to the tower body, and the tower body is 2.8m, the horizontal spacing between the wires on the same side of the tower body is 5.2m, and the horizontal length of the composite cross arm structure on one side of the tower body is 8 m.
Preferably, a V-shaped cable-stayed insulator is respectively arranged below the upper cross arm and on the left side and the right side of the tower body, and the V-shaped cable-stayed insulator is positioned at the V-shaped intersection point for erecting a wire.
Preferably, the composite cross arm structure is made of an FRP composite material, and the upper cross arm is made of steel.
The embodiment of the utility model provides a technical scheme can include following beneficial effect:
the utility model provides an among the technical scheme, double-phase compound cross arm tangent tower, including the tower head, the tower head is dry style of calligraphy, the tower head includes cross arm and lower cross arm, go up the cross arm with wire arrangement mode on the cross arm adopts the triangular arrangement to arrange down, the cross arm adopts a set of compound cross arm structure that is a style of calligraphy and arranges down, compares with ordinary two return circuit drum type towers, the utility model discloses double-phase compound cross arm tangent tower head height reduces, exhales the height and reduces, and the tower weight alleviates, and basic effort reduces, and wire arrangement mode is more reasonable, and electrical parameter has obtained very big improvement, and area reduces, can effectively reduce the tower footing and fell to reduce the cost.
Drawings
In order to more clearly illustrate the embodiments or prior art solutions of the present invention, the drawings needed to be used in the description of the embodiments or prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a perspective view of an embodiment of a two-phase composite cross-arm tangent tower of the present invention;
fig. 2 is a schematic view of a tower head triangle arrangement of a two-phase composite cross arm tangent tower of the present invention;
fig. 3 is a schematic structural view of a tower head of a two-phase composite cross arm tangent tower of the present invention;
fig. 4 is a schematic structural view of a composite cross arm of a tangent tower with two composite cross arms according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, descriptions in the present application as to "first", "second", and the like are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present application, unless expressly stated or limited otherwise, the terms "connected" and "fixed" are to be construed broadly, e.g., "fixed" may be fixedly connected or detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In addition, the technical solutions between the embodiments of the present invention can be combined with each other, but it is necessary to be able to be realized by a person having ordinary skill in the art as a basis, and when the technical solutions are contradictory or cannot be realized, the combination of such technical solutions should be considered to be absent, and is not within the protection scope of the present invention.
The utility model provides a double-phase compound cross arm tangent tower 100.
Referring to fig. 1-4, in the present embodiment, the two-phase compound cross arm linear tower 100 includes a tower head 20, and is characterized in that: the tower head 20 is in a shape of a Chinese character 'gan', the tower head 20 comprises an upper cross arm 201 and a lower cross arm, the upper cross arm 201 and the lower cross arm are arranged in a triangular mode, and the lower cross arm is of a composite cross arm structure 202 which is in a shape of a Chinese character 'yi'.
The linear tower 100 is designed and selected to meet the requirements of the electrical clearance and the arrangement of the tower head 20, and the arrangement modes of the double-circuit transmission line conductors include vertical arrangement, triangular arrangement, horizontal arrangement and the like. The height of the horizontally arranged tower type tower is lower, but the cross arm is longer, and the line corridor is wide; the triangular tower type shown in fig. 2 has a high tower height, but has a short cross arm and a small line corridor; the arrangement of the vertically arranged tower cross arms in three layers results in higher tower height and poor stress condition, but the corridor of the tower is smaller.
The tower body 10 of the compound cross arm tangent tower 100 adopts a traditional steel structure, the lower 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, and the design, the construction and the maintenance are also more convenient.
The utility model provides an among the technical scheme, for combining neotype combined material, the schematic diagram that the overall arrangement came out after optimizing tower head 20 structure is shown as figure 2, and here combined material only is used for cross arm down, and all the other parts still adopt the steel construction. Compared with the double-loop drum-type tower composite cross arm structure 202, the layout can reduce the use amount of composite materials, can reduce the tower height, can reduce the tower weight, and has the advantages of simple structure, easy node treatment, line corridor saving, convenient construction and maintenance and the like.
The utility model discloses body of tower 10 adopts traditional steel structure, and lower cross arm part adopts combined material (FRP) structure, adopts interference fit bolted connection with the shaft tower component.
The composite cross arm structure 202 mainly bears axial load, and the overall stability problem of the composite material is more prominent than that of a steel member due to the low elastic modulus of the composite material, so that the cross section of the selected member is developed, the wall thickness of the selected member is thin, the inertia moment of the cross section of the selected member is as large as possible, and the stable bearing capacity of the member 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.
Specifically, the composite cross arm structure 202 includes a cross arm insulator 2021, one end of the cross arm insulator 2021 is connected to the tower 10, the other end of the cross arm insulator 2021 is a tail end, and hardware 2022 is disposed at the tail end and the middle part of the cross arm insulator 2021 for erecting a wire.
Specifically, the hardware 2022 may be a suspension hardware 2022, and the length of the suspension hardware 2022 may be 0.5 to 0.7 m.
The suspension hardware 2022 is designed as follows:
because the composite cross arm structure 202 is an insulator, it is contemplated that a suspended insulator string may not be used between the wires and the cross arm. Therefore, the windage yaw discharge fault of the tower head 20 can be eliminated, and the sizes of the cross arm and the tower head 20 are reduced. However, for high voltage class transmission lines using split conductors, in addition to the need for insulation, the design of the tangent tower 100 also requires consideration of longitudinal unbalanced tension forces due to ice shedding or sub-conductor breakage. If the suspension insulator string is cancelled, the structural specifications of the cross arm and the tower body 10 need to be increased due to the longitudinal unbalanced tension control of the split conductor, which is not economical. Therefore, the length of the overhang fitting 2022 of the composite cross arm is determined according to the checking result of the wire breakage tension (or the split wire longitudinal unbalance tension).
According to the regulation, the breaking tension (or the longitudinal unbalanced tension of the split conductor) of the lead wire and the ground wire in the ice area of 10mm or less is taken to be in accordance with the maximum use tension percentage of the lead wire and the ground wire specified below, and the ice-coating load is designed by taking 100% of the vertical ice load.
Wire breaking tension (maximum use tension%) of ice zone conducting and grounding wire of 110 mm and below
The unbalanced tension values of the lead wires and the ground wires under the condition of uneven ice coating in the 10mm ice area meet the percentage of the maximum use tension of the lead wires and the ground wires specified in the following table. The vertical ice load was calculated as 75% of the design ice coating load. The corresponding meteorological conditions are calculated according to the meteorological conditions of-5 ℃ and 10m/s wind speed.
TABLE 2 unbalanced tension (%) of ground wire and lead wire in case of uneven ice coating
(I) calculation of tension of broken wire
According to the technical conditions of the engineering, the model for calculating the wire breaking tension has no height difference according to the equal 7 grades, the strain section of the light and medium ice area is covered with 100 percent of ice, the wire is broken at the 1 st grade or the 7 th grade, a half of wires are broken, and the wire breaking tension is calculated.
TABLE 3 calculation table for line-breaking tension of tangent tower 100
(II) longitudinal unbalance tension calculation of uneven icing
The calculation model of the unbalanced tension is in accordance with 7 continuous grades, only a middle base rod tower has a height difference in front and at the back, and the other towers have no height difference in front and at the back. And (3) coating 100% of ice on the front 6 grades of the tension-resistant section in the light and medium ice area, and coating 20% and 40% of ice on the 1 st grade or the 7 th grade, and calculating the longitudinal unbalanced tension.
Table 4 tangent tower unbalance tension calculating table
From the calculation results, it can be seen that the length of the wire connection fitting 2022 string of the composite cross arm linear tower 100 has a large influence on the unbalanced tension and the broken line tension, and the shorter the connection fitting 2022 string is, the larger the unbalanced and broken line tension is.
And comparing the calculated unbalanced tension and the percentage of the broken line tension with the set value of the design rule under the calculation condition, wherein the calculated unbalanced tension and the percentage of the broken line tension do not exceed the rule control value.
Comprehensively considering, the length of the suspension hardware 2022 can be 0.5-0.7 m, and the actual value can be determined after the unbalanced tension and the broken wire tension are calculated according to the conditions of tower call height, span, height difference and the like of the actual engineering strain section.
Specifically, compound cross arm structure 202 still includes draws the insulator to one side, the one end that draws the insulator to one side connect in body of the tower 10, the other end that draws the insulator to one side connect in cross arm insulator 2021's end, draw insulator tip and body of the tower 10 department to one side and adopt the cross picture peg to be connected.
Specifically, the cross arm insulator 2021 includes at least two post insulators, the post insulators may be connected to each other by flanges to form a straight line, the composite cross arm structures 202 are connected to each other by metal sleeve flange joints, the end portion of the composite cross arm structure 202 is connected to the tower body 10 by a cross socket, and in addition, an end fitting 2022 in the power transmission line may also be used to connect the end portion of the composite cross arm structure 202 to the tower body 10 by using a technical scheme disclosed in CN 201811273298.
And simultaneously, the utility model discloses also can adopt interference fit to connect, on general clearance mechanical connection mode promptly, through applying certain interference volume, adjusting its modulus than and pore wall and fastener friction coefficient between reach the novel connected mode of preferred joint strength to connecting elements. In order to be matched and connected in an interference fit mode, the engineering adopts a composite material pipe with a square section. According to the connection mode, a steel sleeve and a cross steel inserting plate are omitted, holes are directly punched in the composite material pipe, the diameter of a selected bolt is slightly larger than the hole diameter, the bolt is generally matched according to 0.7% -2% of interference amount, the screwing torque value of the bolt is controlled, the friction coefficient of the hole wall of the bolt reaches about 0.2-0.4, stress concentration can be effectively reduced, and the safety of node connection is guaranteed. The interference fit connection mode saves a steel sleeve and a cross steel inserting plate, so that the weight of the node member is greatly reduced, the connection is simple, the construction is convenient, and the economic benefit is better.
Specifically, the cable-stayed insulator comprises a group of horizontal cable-stayed insulators 2023, the horizontal cable-stayed insulators 2023 are arranged in a V shape along the horizontal direction, one end of each horizontal cable-stayed insulator 2023, which is located at the opening of the V shape, is connected to the tower body 10, and the other end of each horizontal cable-stayed insulator 2023 is connected to the tail end of the cross arm insulator 2021.
Specifically, the cable-stayed insulator further comprises a group of upper cable-stayed insulators 2024 located above the cross arm insulator 2021, each upper cable-stayed insulator 2024 comprises a first upper cable-stayed insulator 2024 and a second upper cable-stayed insulator 2024, each upper cable-stayed insulator 2024 is arranged in a V shape along the vertical direction, one end of each upper cable-stayed insulator 2024 located at a V-shaped intersection is connected to the tower body 10, and one end of each upper cable-stayed insulator 2024 located at a V-shaped opening is connected to the cross arm insulator 2021.
Specifically, the first upper cable-stayed insulator 2024 is connected to the flange near the tower body 10, and the second upper cable-stayed insulator 2024 is connected to the end of the cross arm flange.
Specifically, V-shaped diagonal insulators 2011 are respectively arranged below the upper cross arm 201 on the left side and the right side of the tower body 10, and the V-shaped diagonal insulators 2011 are positioned at V-shaped intersection points for erecting wires.
Specifically, the vertical spacing distance between the upper cross arm 201 and the lower cross arm is 7.5m, the vertical spacing distance between the upper layer of conducting wires and the lower layer of conducting wires is 5.5m, the distance between the conducting wires on the composite cross arm structure 202, which are close to the tower body 10, and the tower body 10 is 2.8m, the horizontal spacing between the conducting wires on the same side of the tower body 10 is 5.2m, and the horizontal length of the composite cross arm structure 202 on one side of the tower body 10 is 8 m.
The tower head 20 sizing process is as follows:
according to the design specification of 110 kV-750 kV overhead transmission line GB 50545-2010:
(1) for the span of less than 1000m, the distance between horizontal lines is preferably calculated as follows:
TABLE 5 suspension insulator string coefficient table
| Suspension insulator string pattern | I-I string | I-V string | V-V string |
| ki | 0.4 | 0.4 | 0 |
In the formula: ki-coefficient of suspension insulator string, D-distance between horizontal lines of wire (m), Lk-length of suspension insulator string (m), U-nominal voltage of system (kV), fc-maximum sag (m) of wire.
(2) The equivalent horizontal line-to-line distance of the triangular arrangement of the conductive lines is preferably calculated as follows:
in the formula: dx is the equivalent horizontal line-to-line distance (m) of triangular arrangement of the conducting wires, Dp is the horizontal projection distance (m) between the conducting wires, and Dz is the vertical projection distance (m) between the conducting wires.
(3) The minimum distance between the vertical lines of the 220kV towers using the suspension insulator strings is 5.5 m;
(4) the distance between two ground wires on the tower is not more than 5 times of the vertical distance between the ground wire and the lead. In the center of a typical span, the distance between the conducting wire and the ground is calculated as follows:
S≥0.012L+1
in the formula: distance (m) between S-conductor and ground, L-span (m);
(5) for a single loop, the protection angle of the 330kV and below line is not more than 15 degrees.
(6) In the ice region of 10mm, the horizontal offset between adjacent wires of the upper and lower layers or between the ground wire and the adjacent wire is 1 m.
The tower head 20 designed by this report has the following dimensions:
considering that the vertical splitting distance of the wires is 400mm, the length of the suspension fitting 2022 is 500mm, the vertical distance between the upper and lower wires of the double-loop triangular arrangement lower-layer composite material cross arm tangent tower 100 designed at this time is 5.5m, and the distance between the upper and lower cross arms is 7.5 m. Compared with the common 220kV double-circuit vertically-arranged drum tower head 20, the height is reduced by 5.5m, and the length of the insulator is reduced by 8 m.
The distance between the lower layer composite cross arm lead and the tower body 10 is selected according to the requirement of meeting the composite cross arm creepage distance, and is 2.8 m; the distance between the two lines is selected according to the distance requirement between the horizontal lines, and is 5.2 m. 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.
Specifically, the tower body 10 of the compound cross arm tangent tower 100 still adopts a traditional steel structure, and the ground wire grounding form is the same as that of a conventional line. The 220kV transmission line should be erected with double ground wires along the whole line, and the protection angle of the ground wire to the lead wire on the single-loop tangent tower 100 is not more than 15 degrees.
And (4) conclusion:
compared with a conventional angle steel tower, the composite cross arm tangent tower 100 can reduce the nominal height by 8m and reduce the width of a line corridor. Under the same conditions, the weight of an iron tower (steel pole), the foundation acting force, the foundation concrete volume, the foundation steel bar volume and the manufacturing cost of each index are taken as influencing factors, the composite material cross arm tangent tower 100 and the conventional angle steel tangent tower 100 as well as the composite material cross arm steel pole and the conventional steel pole are compared and analyzed, and the analysis results are shown in the following table:
TABLE 6 composite Cross arm tangent tower economic analysis
As can be seen from the above table:
1) the weight of the composite cross arm tangent tower 100 is reduced by about 18% compared with the common tangent tower 100, and the basic acting force is reduced by about 15%.
2) The total cost of the composite cross arm tangent tower 100 designed by the report and a common conventional iron tower is 10% lower, and the cost has a reduced space along with the gradual application of the composite cross arm in the engineering. After the composite cross arm is used, the height of the tower can be effectively reduced, and the economic effect is obvious.
The above only be the preferred embodiment of the utility model discloses a not consequently restriction the utility model discloses a patent range, all are in the utility model discloses a conceive, utilize the equivalent structure transform of what the content was done in the description and the attached drawing, or direct/indirect application all is included in other relevant technical field the utility model discloses a patent protection within range.
Claims (10)
1. The utility model provides a two-phase compound cross arm tangent tower, includes the tower head, its characterized in that: the tower head is the dry style of calligraphy, the tower head includes cross arm and lower cross arm, go up the cross arm with wire arrangement mode on the cross arm adopts the triangle-shaped to arrange and arranges down, the cross arm adopts a set of compound cross arm structure that is a style of calligraphy and arranges down.
2. The two-phase composite cross arm tangent tower as claimed in claim 1, wherein the composite cross arm structure comprises a cross arm insulator, one end of the cross arm insulator is connected to the tower body, the other end of the cross arm insulator is a terminal, and hardware fittings are arranged at the terminal end and the middle part of the cross arm insulator for erecting wires.
3. The two-phase composite cross arm tangent tower as claimed in claim 2, wherein the composite cross arm structure further comprises a cable-stayed insulator, one end of the cable-stayed insulator is connected to the tower body, and the other end of the cable-stayed insulator is connected to the end of the cross arm insulator.
4. A two-phase composite cross arm tangent tower as claimed in claim 3, wherein the cross arm insulator comprises at least two post insulators, which can be connected to each other in a straight line by flanges.
5. The two-phase composite cross-arm tangent tower as claimed in claim 4, wherein the cable-stayed insulators comprise a set of horizontal cable-stayed insulators, the horizontal cable-stayed insulators are arranged in a V shape along a horizontal direction, one end of each horizontal cable-stayed insulator, which is located at the opening of the V shape, is connected to the tower body, and the other end of each horizontal cable-stayed insulator is connected to the tail end of each cross-arm insulator.
6. The two-phase composite cross-arm tangent tower of claim 5, wherein the cable-stayed insulators further comprise a set of upper cable-stayed insulators above the cross-arm insulators, the upper cable-stayed insulators comprise first upper cable-stayed insulators and second upper cable-stayed insulators, the upper cable-stayed insulators are arranged in a V shape along the vertical direction, one end of each upper cable-stayed insulator, which is located at a V-shaped intersection, is connected to the tower body, and one end of each upper cable-stayed insulator, which is located at a V-shaped opening, is connected to the cross-arm insulators.
7. The two-phase composite cross-arm tangent tower as claimed in claim 6, wherein the first upper diagonal insulator is connected to the flange near the tower body, and the second upper diagonal insulator is connected to the end of the cross-arm insulator.
8. A two-phase composite cross arm tangent tower as claimed in any one of claims 1-7, wherein the vertical separation distance between the upper cross arm and the lower cross arm is 7.5m, the vertical separation distance between the wires on the upper cross arm and the lower cross arm is 5.5m, the distance between the wires on the composite cross arm structure, which are close to the tower body, and the tower body is 2.8m, the horizontal distance between the wires on the same side of the tower body is 5.2m, and the horizontal length of the composite cross arm structure on one side of the tower body is 8 m.
9. The two-phase composite cross arm tangent tower as claimed in any one of claims 1 to 7, wherein V-shaped diagonal insulators are respectively disposed below the upper cross arm at left and right sides of the tower body, and the V-shaped diagonal insulators are disposed at V-shaped intersection points for installing wires.
10. The two-phase composite cross arm tangent tower as defined in any one of claims 1-7, wherein said composite cross arm structure is made of FRP composite material and said upper cross arm is made of steel material.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP4071324A4 (en) * | 2021-02-24 | 2023-08-02 | Jiangsu Shemar Electric Co., Ltd. | Composite cross arm and power transmission tower |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4071324A4 (en) * | 2021-02-24 | 2023-08-02 | Jiangsu Shemar Electric Co., Ltd. | Composite cross arm and power transmission tower |
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