Special-shaped insulation wind-resistant structure suitable for large-span power transmission tower in strong wind area

Abstract

The invention discloses a special-shaped insulating wind-resistant structure suitable for a large-span power transmission tower in a strong wind area, relates to the technical field of power transmission towers, and aims at a connecting structure of a cable conductor, the fixing process of a single-section cable body is completed by two wire fixing seats, so that the cable conductor is in a relatively straight state in the middle of the two wire fixing seats, and the cable conductor is fixed in the middle of the two wire fixing seats. The key content is that wire clamping frame structures matched with the cable conductor are symmetrically arranged in a staggered mode in the two directions, wire pressing arc sleeves matched with the cable conductor are arranged at the two ends in an auxiliary mode, and when the cable conductor swings in the left-right direction or the up-down direction due to strong wind, the directional deflection process of the wire clamping frame structures is forcibly formed; the invention aims to transfer stress change generated by a cable conductor in a swinging state to the cable conductor in the middle of two wire fixing seats, and a linkage structure formed by a semi-seizure structure and a connecting arc strip is additionally arranged in cooperation with two wire clamping frame structures, so that vertical load additionally generated due to swinging is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power transmission towers, in particular to a special-shaped insulating wind-resistant structure for a large-span power transmission tower in a strong wind area. BACKGROUND

[0002] For the construction requirements of overhead power transmission towers, the span range thereof is 200-400 m (not considered in special regions) according to the voltage range, and the sag range thereof is about 0.5%-4.5% of the span range, and the insulator, as a core component of the overhead power transmission tower, mainly plays two important roles of electrical insulation and mechanical support.

[0003] The mechanical support role is mainly described, the insulator must have sufficient vertical load capacity, and the problems such as conductor galloping or wind-induced vibration also need to be considered, and structures such as anti-vibration hammers (refer to CN119171366A) and spacer bars (refer to CN119921245A) are mostly used in the conventional operation process, and the key purpose is to suppress the vibration amplitude of the cable along the wind direction, but it needs to be supplemented that: Although the insulator mainly bears the vertical load, when the cable produces unidirectional galloping, the vertical load capacity of the insulator itself is also increased, especially for large-span (high-span) power transmission towers, the larger the span, the larger the sag, so when the cable gallops due to strong wind, the vertical load between the insulator and the cable is large, and therefore the following risks exist: Alternating stress may cause the internal micro-cracks of the porcelain insulator to expand, the connection to fail due to the loosening of the bolts of the hardware fittings caused by repeated vibration, and the broken strands caused by the increased friction of the conductor or the spacer bar, and a solution is proposed for this problem. SUMMARY

[0004] The purpose of the present application is to provide a special-shaped insulating wind-resistant structure for a large-span power transmission tower in a strong wind area, which is aimed at the problem of conductor galloping or wind-induced vibration of the cable of the large-span power transmission tower due to strong wind, and specifically aggravates the vertical load of the insulator, which directly affects the structural stability of the overall hardware fitting.

[0005] The purpose of the present application can be achieved by the following technical solution: a special-shaped insulating wind-resistant structure for a large-span power transmission tower in a strong wind area, comprising a fixed seat, an insulator, a wire fixing seat, and a cable conductor clamped by a clamping block, the clamping block is used to connect the wire fixing seat and the insulator, and the wire fixing seat is used to clamp the cable conductor, the clamping block is rotationally connected with a left wire clamping frame and a right wire clamping frame, the lower end of each of the left wire clamping frame and the right wire clamping frame is provided with a wire pressing arc sleeve corresponding to the outer contour of the cable conductor, and each of the left wire clamping frame and the right wire clamping frame is in an arched shape. The cable holder left and the cable holder right are symmetrically arranged in the Y-Z plane of the center point of the cable conductor, and the opening directions of the two wire pressing arc sleeves close to the fixed wire holder are opposite.

[0006] Further, the fixed wire holder is symmetrically arranged on the fixed seat along the laying length direction of the cable conductor.

[0007] Further, the two groups of the cable holder left and the cable holder right are respectively provided with a triangular wedge groove and a triangular arc wedge at the side position away from each other, the triangular arc wedge is installed on the inner wall of the cable holder right, and the triangular wedge groove is opened on the inner wall of the cable holder left.

[0008] Further, the triangular arc wedge is conical along the cross section of the surface normal, and the end of the triangular arc wedge close to the cable holder left is a cylinder, and the width thereof decreases along the direction from the cable holder right to the cable holder right.

[0009] Further, the triangular wedge groove is open corresponding to the direction of the cable holder right, and the contour line of the triangular wedge groove is outward deviated relative to the contour line of the triangular arc wedge.

[0010] Further, the contact position of the wire pressing arc sleeve and the cable conductor is provided with a directional pad, and the directional pad is made of ceramic material.

[0011] Further, the directional pad is used to fill the gap between the inner wall of the wire pressing arc sleeve and the cable conductor, and the center point of the directional pad and the center point of the cable conductor are left deviated or right deviated along the Z-X plane.

[0012] Further, the two groups of the cable holder left and the cable holder right are provided with a connecting arc strip at the end position close to each other in a staggered manner, the two end positions of the connecting arc strip are rotationally connected with the cable holder left and the cable holder right, a connecting guide column is arranged at the cross position below the two connecting arc strips, and a auxiliary wire connecting part corresponding to the connecting guide column is arranged on the fixed seat.

[0013] The present application has the following advantages: 1. For the connection structure of the cable conductor in the transmission tower with large span and high sag, two fixed wire holders are used as the fixed structure of the single cable body, so that the cable conductor in the middle part of the two fixed wire holders is in a relative straight state. The key is to cooperate with the clamping block to set two cable holder structures, the cable holder is staggered arranged along the Z-Y and Z-X planes, and the "connection" structure is formed between the wire pressing arc sleeve and the cable conductor. When the cable conductor swings due to strong wind, the stress generated at one end of the cable conductor due to swinging can be transferred to the cable conductor in the middle part of the two fixed wire holders. The purpose is to reduce the vertical load generated by the swinging of the cable by reducing the swinging amplitude. 2. Based on the above content, the structure of the two card line frames is optimized, first, a triangular arc wedge and a triangular wedge groove are specially added, the purpose is to improve the structural strength of the two card line frames, form a "half-bite" structure, avoid the problem of disengagement when the cable conductor moves left and right, second, the connecting arc strip is further added to the structure of the two card line frames, the purpose is to form a linkage structure of the two card line frame structures, and the auxiliary wiring part bears the additional load when the two card line frame structures are angularly deflected, the key purpose is to transfer the additional vertical load generated when the cable conductor swings through linkage. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0015] Figure 1 The structural schematic diagram of the special-shaped insulating wind-resistant structure suitable for the large-span power transmission tower in the strong wind area is provided for the present application. Figure 2 The combined schematic diagram of the wire holder, the left card line frame and the right card line frame is provided for the present application. Figure 3 The cross-sectional view of the wire holder is provided for the present application. Figure 4 The top view of the corresponding triangular arc wedge and triangular wedge groove of the left card line frame and the right card line frame is provided for the present application. Figure 5 The reversing schematic diagram of the corresponding card seat block of the left card line frame and the right card line frame is provided for the present application. Figure 6 The front view of the Figure 2 of the present application is provided. Figure 7 The lateral schematic diagram of the corresponding cable conductor of the left card line frame and the right card line frame is provided for the present application.

[0016] In the figure: 1, fixed seat; 2, auxiliary wiring part; 3, insulator; 4, cable conductor; 5, wire holder; 6, card seat block; 7, left card line frame; 701, triangular wedge groove; 8, right card line frame; 801, triangular arc wedge; 9, wire pressing arc sleeve; 901, directional pad; 10, connecting arc strip; 11, force guide column. DETAILED DESCRIPTION

[0017] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Example 1: For problems such as conductor galloping or wind-induced vibration in cables of long-span transmission towers due to strong winds, the undirected galloping of the cable also increases the vertical load capacity of the insulator itself. This is especially true for long-span (high span) transmission towers, where the larger the span, the greater the sag, directly affecting the structural stability of the overall hardware. The following technical solution is proposed to address this issue: Reference Figures 1-7 The irregular insulation wind-resistant structure adapted to long-span transmission towers in strong wind areas in this embodiment includes a fixed base 1, an insulator 3, a wire fixing base 5, a clamping block 6, and a cable conductor 4. The clamping block 6 completes the connection process between the wire fixing base 5 and the insulator 3, and the wire fixing base 5 is used to clamp the cable conductor 4. A left clamping frame 7 and a right clamping frame 8 are rotatably connected on the clamping block 6. The lower ends of the left clamping frame 7 and the right clamping frame 8 are provided with wire pressing arc sleeves 9 corresponding to the outer contour of the cable conductor 4, and the left clamping frame 7 and the right clamping frame 8 are both arched. The left 7 and right 8 of the wire clamping frame are arranged symmetrically in an alternating manner along the YZ plane of the center point of the cable conductor 4. The opening directions of the two wire clamping arc sleeves 9 on the side near the wire fixing seat 5 are opposite. The wire fixing seat 5 is arranged symmetrically on the fixing seat 1 along the laying length direction of the cable conductor 4.

[0019] Basic principle: Refer to Figure 1 Explanation: Because this invention addresses the requirements for cable erection in long-span transmission towers, it uses a fixed base 1 as the fixed structure in the transmission tower, with an insulator 3 fixed underneath it, and the insulator 3 and the clamping block 6 connecting the wire fixing base 5. The structure of the insulator 3, the clamping block 6, and the wire fixing base 5 are basic structural requirements in transmission towers, so they will not be described in this invention. As the span of the transmission tower increases, its sag also increases. To improve the stability of the cable conductor 4 after installation, two sets of insulators 3 can be installed to "evenly distribute" the weight changes of the cable conductor 4. The basic content of this invention is: to further optimize the cable clamping frame structure based on the clamping block 6, and refer to... Figure 2 and Figure 3 This further subdivides the cable tray into left 7 and right 8, specifically... Figure 3 The following is an explanation: Both wire clips are symmetrically distributed along the ZX plane of the center point of the clip block 6, and both have a wire pressing arc sleeve 9 at one end. To briefly explain the above, when the cable conductor 4 swings due to strong winds, the cable conductor 4 can be fixed again by the wire clamping arc sleeve 9, and the left 7 or right 8 of the wire clamping frame can be deflected in a directional manner.

[0020] Example 2: Supplementary explanation regarding the deflection methods of the left and right cable clamps proposed in Example 1: On the two sets of cable clamps, left 7 and right 8, which are far apart from each other, there are triangular wedge grooves 701 and triangular arc wedges 801 respectively. The triangular arc wedge 801 is installed on the inner wall of the right 8 of the cable clamp, and the triangular wedge groove 701 is opened on the inner wall of the left 7 of the cable clamp. The cross-section of the triangular arc wedge 801 along its surface normal is conical, and the end of the triangular arc wedge 801 near the left 7 of the cable clamp is set as a column and its width decreases along the direction from the right 8 to the right 7 of the cable clamp. The triangular wedge groove 701 is open in the direction corresponding to the right 8 of the cable clamp, and the outline of the triangular wedge groove 701 is deviated outward relative to the outline of the triangular arc wedge 801.

[0021] Solution Description: Because this invention pertains to the optimization of cable conductor installation methods in long-span transmission towers, cable conductor 4 inevitably suffers from sag. Figure 6 For example, both ends of the cable conductor 4 are bent into a downward arc shape, while the cable conductor 4 located in the middle part of the two wire fixing seats 5 is in a relatively straight state. Therefore, in the initial state, the wire clamping arc sleeve 9 with the opening facing upward is affected by the gravity of the cable conductor 4, which causes the corresponding wire clamping frame structure to change. by Figure 5 For example, the wire clamping frame structure corresponding to the upward-facing wire clamping arc sleeve 9 is set as wire clamping frame right 8, and the wire clamping frame right 8 rotates counterclockwise along the rotation point position with the clamping block 6. This will cause the wire clamping arc sleeve 9 on the other side of the wire clamping frame right 8 to move downward. However, it should be noted that the opening directions of the wire clamping arc sleeves 9 at both ends of the wire clamping frame left 7 and the wire clamping frame right 8 are completely opposite. Therefore, in the counterclockwise direction of the wire clamping frame right 8, the wire clamping arc sleeve 9 on its right side will flip upward. Conversely, during installation, the initial position of the cable clamp 7 needs to be limited according to the sag range so that the pressure arc sleeve 9 at one end of it matches the cable conductor 4. The key content is to accommodate the two possible swing modes of the cable conductor 4, either left or right or up and down, under strong wind conditions. This can be understood as transferring the stress generated when the cable sways due to strong winds to the cable conductor 4 in the middle of the two fixed supports 5. However, the specific process will be explained below: S1: The process of fixing a section of cable conductor 4 is completed by two fixed bases 5. When the cable conductor 5 is affected by strong wind and swings, theoretically the stress change is "transferred" to the section of cable conductor 4 between the two fixed bases 5. However, the cable conductor 4 has been fixed by the two fixed bases 5, so the section of cable conductor 4 between the two fixed bases 5 is in a relatively taut state. This part of the cable conductor 4 is difficult to bend. Therefore, this method is used to initially overcome the stress generated when the cable conductor 4 swings. S2: When the two cable clamp structures are deflected due to the swing of the cable conductor 4, they also rely on the triangular wedge groove 701 and the triangular arc wedge 801, as shown in the reference. Figure 4 This can be understood as follows: the triangular wedge groove 701 and the triangular arc wedge 801 are in a stable state of "mutually semi-locked together." The purpose is to prevent the two cable clamps from disengaging when the cable conductor 4 swings left and right. However, further constraints on their structural characteristics are needed to ensure... Figure 4 For example, the triangular wedge 801 can be locked in the triangular wedge groove 701 and ensure that the two wire clamping frame structures do not separate. It is also necessary to avoid the outer contours of the triangular wedge groove 701 and the triangular wedge 801 being completely matched, which would affect the angle deflection of the two wire clamping frame structures. The contour area of ​​the triangular wedge groove 701 is slightly larger than the contour surface of the triangular wedge 801. This can be understood as the contour line of the triangular wedge groove 701 deviating outward by a certain distance along the contour line of the triangular wedge 801. S3: and refer to Figure 2 and Figure 3 When the cable conductor swings, the cable conductor 4 in the two fixed bases 5 will not produce obvious galloping. Therefore, the above triangular wedge groove 701 and triangular arc wedge 801 must be set on the side of the cable conductor 4 with a larger galloping amplitude. This is because when the cable conductor 4 gallops, the structural strength of the two cable clamps is improved by the "semi-locking" structure of the triangular wedge groove 701 and triangular arc wedge 801.

[0022] Example 3: Based on Example 2, the following supplementary explanation is provided: Orientation pads 901 are provided at the contact positions between the wire clamping arc sleeve 9 and the cable conductor 4. The orientation pads 901 are made of ceramic material and are used to fill the gap between the inner wall of the wire clamping arc sleeve 9 and the cable conductor 4. The center point of the orientation pad 901 is offset to the left or right along the ZX plane from the center point of the cable conductor 4. Connecting arc strips 10 are provided at the close ends of the two sets of wire clamping frames (left 7 and right 8) in an alternating manner. The two ends of the connecting arc strips 10 are rotatably connected to the left 7 and right 8 of the wire clamping frames. Relay guide posts 11 are provided at the intersection positions on the lower side of the two connecting arc strips 10. Auxiliary wiring parts 2 corresponding to the relay guide posts 11 are provided on the fixed base 1.

[0023] Supplementary Option 1: Since the transmission tower serves as the "fixed structure" for the cable conductor 4, when the cable conductor 4 sways due to strong winds, the cable conductor 4 at the two fixed bases 5 located at opposite ends will also sway, and the degree of swaying of the cable conductor 4 at both ends will not be completely consistent. To address this, a connecting arc strip 10 is added at the middle position of the two fixed bases 5. It should be explained that the two fixed bases 5 are mirror-symmetrically arranged, while the connecting arc strip 10 is set along the length of the cable conductor 4 and will not bend. However, the connecting arc strip 10 is bent downwards along the ZY plane. This can be directly understood as follows: the ends of the right 8 of the cable clamp on the left side and the left 7 of the cable clamp on the right side are connected horizontally by the connecting arc strip 10, and the connection method is a rotating or hinged type of movement. Taking the second embodiment as an example: when the right 8 of the cable clamp on both sides rotates counterclockwise, the angle deflection of the left 7 of the cable clamp will also be affected by the connecting arc strip 10, and finally converge on the connecting arc strip 10, which will cause the connecting arc strip 10 to bend along the direction of the cable conductor 4. Supplementary Option 2: In conjunction with Supplementary Option 1, the left 7 and right 8 of the wire clamp in the fixed base 5 at a single position are also staggered along the length of the cable conductor 4. When ensuring that the arc lengths of the two connecting arc strips 10 are consistent, there will inevitably be an intersection position on their lower sides. Therefore, a relay guide post 11 is set at the intersection position on their lower sides. The relay guide post 11 will also be installed on the fixed base 1 with an auxiliary connector 2. The auxiliary connector 2 is also a high-strength and insulating structure, but it is not a key load-bearing structure for the cable conductor 4. It only plays an auxiliary role. The key is its insulation. The specific structure will not be explained in detail. A small-sized insulator structure can also be used. Supplementary Option 3: Taking Supplementary Option 2 as an example, after the two connecting arc strips 10 undergo bending deformation, their intersection position changes, thus affecting the relative position of the relay guide post 11. However, it is necessary to limit the connection length of the auxiliary connector 2 to a fixed value. Specifically, when the intersection position changes relative to the connection, the auxiliary connector 2 always lifts the two connecting arc strips 10. This part is only an auxiliary component and is not used as the main load-bearing structure. And reference Figure 7 To prevent direct electrical contact between the cable conductor 4 and the pressure arc sleeve 9, an oriented pad 901 can be added at the contact point. This pad can be made of an insulating material such as ceramic. However, as shown in Embodiment 2, to prevent stress changes when the cable conductor 4 swings left and right, a reference can be made to... Figure 7 The internal directional pad 901 of the downward-opening pressure arc sleeve 9 generates a leftward thrust on the cable tape 4, while the internal directional pads of the two upward-opening pressure arc sleeves 9 on the same side generate a rightward thrust. The purpose is also to overcome the stress changes caused by the left and right swing of the cable conductor 4, reduce the stress damage to the cable conductor 4 during the swing process (both left and right and up and down directions), limit the swing direction of the cable by using the directional deflection process of the two wire clamps, and the wire clamp structures on the two sets of fixed bases form a linkage structure through the connecting arc strip 10, supplemented by the auxiliary connector 2 to bear the additional burden when the angle of the two sets of wire clamp structures deflects. The key purpose is to transfer the additional vertical load generated when the cable conductor 4 swings through the linkage method.

[0024] In summary: Regarding the connection structure of the cable conductor, the process of fixing a single section of the cable body is completed by two fixed bases, so that the cable conductor is relatively taut in the middle part of the two fixed bases. The key is the wire clamping frame structure set up in conjunction with the cable conductor, which is symmetrically arranged in both directions, and the two ends are supplemented with wire clamping arc sleeves that are compatible with the cable conductor. When the cable conductor swings left and right / up and down due to strong winds, the wire clamping frame structure is forced to form a directional deflection process. The purpose is to "transfer" the stress changes generated by the swinging cable conductor to the cable conductor in the middle part of the two fixed bases. In addition, the two wire clamping frame structures are equipped with a "semi-locking" structure and a linkage structure formed by connecting arc strips, thereby reducing the additional vertical load caused by the swing.

[0025] The above description is merely an example and illustration of the structure of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the structure of the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

Claims

1. A wind-resistant, irregularly shaped insulating structure suitable for large-span transmission towers in areas with strong winds, comprising a fixed base (1), an insulator (3), a wire fixing base (5), a clamping block (6), and a cable conductor (4), characterized in that, The connection process between the wire holder (5) and the insulator (3) is completed by the card block (6), and the wire holder (5) is used to clamp the cable conductor (4). The left wire holder (7) and the right wire holder (8) are rotatably connected on the card block (6). The lower ends of the left wire holder (7) and the right wire holder (8) are provided with wire pressing arc sleeves (9) corresponding to the outer contour of the cable conductor (4), and the left wire holder (7) and the right wire holder (8) are both arched. The left (7) and right (8) wire clamps are arranged symmetrically along the YZ plane of the center point of the cable conductor (4), and the opening directions of the two wire clamping arc sleeves (9) located near the side of the wire fixing seat (5) are opposite.

2. The irregularly shaped insulating wind-resistant structure adapted for long-span transmission towers in strong wind areas according to claim 1, characterized in that, The cable holder (5) is symmetrically arranged on the fixing seat (1) along the length of the cable conductor (4).

3. The irregularly shaped insulating wind-resistant structure adapted for long-span transmission towers in strong wind areas according to claim 2, characterized in that, On the two sets of cable clamps, the left (7) and right (8) are respectively provided with triangular wedge grooves (701) and triangular arc wedges (801) on the opposite side. The triangular arc wedges (801) are installed on the inner wall of the right (8) of the cable clamp, and the triangular wedge grooves (701) are opened on the inner wall of the left (7) of the cable clamp.

4. The irregularly shaped insulating wind-resistant structure adapted for long-span transmission towers in strong wind areas according to claim 3, characterized in that, The triangular arc wedge (801) has a conical cross-section along its surface normal, and the end of the triangular arc wedge (801) near the left (7) of the wire clamp is set as a column and its width decreases along the direction from the right (8) of the wire clamp to the right (7) of the wire clamp.

5. The irregularly shaped insulating wind-resistant structure adapted for long-span transmission towers in strong wind areas according to claim 3, characterized in that, The triangular wedge groove (701) is open in the direction of the right (8) of the wire clamp, and the outline of the triangular wedge groove (701) is deviated outward relative to the outline of the triangular arc wedge (801).

6. The irregularly shaped insulating wind-resistant structure adapted for long-span transmission towers in strong wind areas according to claim 1, characterized in that, The contact positions between the wire clamping sleeve (9) and the cable conductor (4) are provided with directional pads (901), and the directional pads (901) are made of ceramic material.

7. The irregularly shaped insulating wind-resistant structure adapted for long-span transmission towers in strong wind areas according to claim 7, characterized in that, The directional pad (901) is used to fill the gap between the inner wall of the wire arc sleeve (9) and the cable conductor (4), and the center point of the directional pad (901) is offset to the left or right from the center point of the cable conductor (4) along the ZX plane.

8. The irregularly shaped insulating wind-resistant structure adapted for long-span transmission towers in strong wind areas according to claim 1, characterized in that, Two sets of wire clamps, left (7) and right (8), are provided with connecting arc strips (10) at their respective ends in an alternating manner. The two ends of the connecting arc strips (10) are rotatably connected to the left (7) and right (8) of the wire clamps. A relay guide post (11) is provided at the intersection of the two connecting arc strips (10) on the lower side. An auxiliary connector (2) corresponding to the relay guide post (11) is provided on the fixed base (1).

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