A wind-proof fixing device for double-split conductors of power transmission lines

Abstract

The present invention provides a horizontal double-split conductor anti-wind deflection fixing device, which belongs to the technical field of high-voltage power transmission. It includes an upper connecting plate, a lower connecting plate, an upper insulator string, a lower insulator string and a wire clamp; the upper connecting plate is located at the upper part of the conductor, and is an isosceles triangle, with connection holes arranged at the three corners, the connection hole at the top corner is used to connect the upper insulator string, and the two connection holes at the bottom corner are used to connect the conductor; the lower connecting plate is located at the lower part of the conductor, and is an inverted isosceles triangle, with connection holes arranged at the three corners, the connection hole at the bottom corner is used to connect the lower insulator string, and the two connection holes at the top corner are used to connect the upper connecting plate; the top end of the upper insulator string is fixedly connected to the upper cross arm, and the bottom end is fixedly connected to the upper connecting plate; the bottom end of the lower insulator string is fixedly connected to the lower cross arm, and the top end is fixedly connected to the lower connecting plate; the wire clamps are arranged in pairs at the lower part of the upper connecting plate, and are fixedly installed on the conductor. The present invention can limit the position of the conductor to prevent it from deflecting, and can achieve a good anti-wind deflection effect.

Description

Technical Field

[0001] The invention belongs to the technical field of high-voltage power transmission, and in particular relates to a wind-proof and deflection-proof fixing device for a horizontal double-split conductor. Background Art

[0002] Wind deflection refers to the gradual increase in the wind deflection angle of the transmission line conductor under the action of wind force. The conductor will be displaced and deflected to varying degrees with the wind force. When the insulation strength of the air gap between the transmission line conductor and the tower is less than the working voltage of the transmission line conductor, air breakdown flashover will occur. In recent years, due to the rapid growth of electricity load, the voltage level of transmission lines has become higher and higher, and the line corridor has developed towards large spans, resulting in the lightweight of conductors and insulators, which has caused the transmission lines to be more and more sensitive to wind, and the wind deflection problem of overhead transmission lines has become more and more significant. Once wind deflection flashover occurs, it will cause line tripping, power loss, and even strand and line breakage accidents, seriously affecting the safe operation of the power grid and the reliability of the power supply system. Therefore, it is very important to improve the ability of transmission lines to resist wind deflection.

[0003] The double-split conductor is mainly used in transmission lines with voltages of 220 kV and above, and each phase line is composed of two conductors. In the prior art, some wind deflection prevention measures for double-split conductors have appeared.

[0004] For example, patent document CN110620362A proposes a method for pulling down the center line of an inverted V string of a straight pole tower to prevent wind deviation, which includes the following steps: using the central bolt of the vertical double-split suspension wire clamp frame below the tower-shaped center line composite insulator of the transmission line as the hanging point, the head ends of the two composite insulators are respectively connected to the central bolt, and the tail ends of the two composite insulators are respectively connected to the two sides of the tower head, and the two composite insulators are connected to form an inverted V string. However, this method is only applicable to the middle phase of the vertical double-split conductor, not to the horizontal double-split conductor.

[0005] For example, patent document CN203466533U proposes a special-shaped weight piece for horizontal double-split conductors of power transmission lines, including a weight piece body, a fixing hole on the upper part of the weight piece body, and the upper edge of the weight piece body is composed of two symmetrical oblique neck edges intersecting obliquely, the two oblique neck edges intersecting on the central axis, and a semicircular hardware hole is formed at the central axis where the two oblique neck edges intersect, and the angle between the two oblique neck edges and the horizontal line is 20-25 degrees. This patent increases the weight of the conductor by setting a weight, and increases the wind deflection resistance of the conductor, but the use of a weight cannot completely resist the wind deflection effect on the conductor when strong winds invade. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a wind-proof fixing device for a horizontal double-split conductor in view of the deficiencies in the prior art.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0008] A horizontal double-split conductor wind deflection prevention fixing device comprises an upper connecting plate, a lower connecting plate, an upper insulator string, a lower insulator string and a wire clamp;

[0009] The upper connecting plate is located on the upper part of the conductor, is an isosceles triangle, is vertically arranged across the conductor, and has a horizontal bottom side; connection holes are arranged at the three corners of the upper connecting plate, the connection hole at the top corner is used to connect the upper insulator string, and the two connection holes at the bottom corner are used to connect the conductor;

[0010] The lower connecting plate is located at the lower part of the conductor, is an inverted isosceles triangle, is vertically arranged along the conductor, and has a horizontal top edge; connection holes are arranged at the three corners of the lower connecting plate, the connection hole at the bottom corner is used to connect the lower insulator string, and the two connection holes at the top corner are used to connect the upper connecting plate;

[0011] The upper insulator string is vertically arranged and located on the upper part of the conductor, with the top end fixedly connected to the upper cross arm and the bottom end fixedly connected to the connection hole at the top corner of the upper connecting plate;

[0012] The lower insulator string is vertically arranged and located at the lower part of the conductor, with the bottom end fixedly connected to the lower cross arm and the top end fixedly connected to the connection hole at the bottom corner of the lower connecting plate;

[0013] The wire clamps are arranged in pairs at the lower part of the upper connecting plate, fixedly mounted on the wires, and the tops are fixedly connected one-to-one with the two connecting holes at the bottom corners of the upper connecting plate.

[0014] Furthermore, the center distance between the connection holes at the two bottom corners of the upper connecting plate is equal to the center distance between the two wires.

[0015] Furthermore, there are two upper connecting plates, two upper insulator strings, and two pairs of wire clamps; the upper connecting plates are arranged side by side, and the center distance is equal to the center distance of the connecting holes at the two top corners of the lower connecting plates.

[0016] Furthermore, a connecting hole is provided at the center position of the bottom of the upper connecting plate, and the connecting holes at the two top corners of the lower connecting plate are fixedly connected one-to-one with the connecting block at the center of the bottom of the lower connecting plate through a connecting rod.

[0017] Furthermore, the connecting rod is arranged vertically.

[0018] Furthermore, the three corners of the upper connecting plate and the three corners of the lower connecting plate are all rounded.

[0019] Furthermore, the wire clamp is a clamping type wire clamp.

[0020] As a commonly used conductor connection device on both sides of the tower, the suspension insulator string is often in the form of an I string, which has poor lateral stability. When the conductor is subjected to wind load, it will deflect, thereby changing the gap between it and the tower. When the distance between the conductor and the tower exceeds the critical value of the withstand voltage, a discharge phenomenon will occur, which is the wind-induced flashover of the conductor. Once a wind-induced flashover occurs in a transmission line, it may cause a large-scale power outage, and it is difficult to succeed after reclosing, which seriously affects the stability of the power supply of the power grid system and causes significant economic losses.

[0021] In response to this situation, one current wind deflection prevention measure is to use a lengthened tower cross arm. Although this method can fundamentally change the wind deflection fault, it will increase the amount of steel used in the tower and increase the project cost. If this method is used to carry out wind deflection prevention transformation on the already operational lines, the cross arm needs to be reprocessed, power outages are required during construction, the wires need to be put on the ground, and a crossing frame needs to be built at the crossover. The construction period is long, the workload of supervising the wires after they are put on the ground is too large, and safety is difficult to guarantee. The prior art also uses a V-shaped insulator string to suspend the wire. This method can reduce the wind deflection of the wire, but a lengthened cross arm is also required when suspending the insulator string.

[0022] Therefore, there are wind deflection prevention measures that do not require lengthening the crossarm, such as installing a weight plate at the bottom of the suspended insulator string. Adding a weight plate is equivalent to increasing the vertical load of the conductor. When encountering severe windy weather conditions, the vertical load of the weight plate is used to resist the wind load. When the single-string insulator string still cannot meet the demand after adding weights, the original single-string insulator string can be changed to a double-string insulator string, and double weights can be installed to reduce the wind deflection angle of the conductor during strong winds and the torsion at the suspension point, so as to maintain sufficient air gap between the conductor and the tower body. However, under strong winds, the conductor of this method will still deflect, and there is still a risk of wind deflection disasters.

[0023] In this case, measures to fix the conductors up and down to prevent wind deviation have emerged. For example, patent document CN107394733A proposes an auxiliary wind protection device for power transmission lines, including a first insulator and a second insulator. A crossarm and an auxiliary crossarm are fixedly installed in sequence from top to bottom on the upper part of the tower. One end of the first insulator is hinged on the crossarm, and one end of the second insulator is hinged on the auxiliary crossarm. The other ends of the first insulator and the second insulator are both suspended on the transmission line. This invention prevents the conductors from wind deviation by sharing the shear force generated by strong winds through the upper crossarm and the lower auxiliary crossarm. However, this invention is not suitable for horizontal double-split conductors. At the same time, only the first insulator on the upper part may not be able to withstand the gravity of the conductor and the second insulator.

[0024] To solve the above problems, the applicant uses double hanging points to hang double strings of insulators on the upper cross arm, and uses the insulator string to fix the conductor on the lower cross arm to prevent the conductor from shifting under strong winds and avoid wind deviation disasters.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] The present invention suspends the conductor on the upper cross arm of the pole tower through a double insulator string, and fixes the conductor to the lower cross arm through another insulator string, and adjusts the flexible connection of the conductor on the suspension tower to a rigid fixation, which can limit the position of the conductor to prevent its deviation, achieve a good wind-proof effect, reduce the discharge of the conductor to the tower body and the electric field distortion caused by strong wind, can meet the actual needs of different projects, and has a simple structure and convenient construction.

[0027] When the present invention is used to transform the transmission line that has been put into operation into wind deflection protection, it is not necessary to transform the pole tower or lengthen the crossbar, and the transformation can be completed, which is economical. The present invention can improve the wind deflection protection capability of the conductor, make the line operation safer, increase the service life of the line, and save engineering investment.

[0028] The double insulator string provided by the present invention has two wires suspended in each insulator string. Even if one of the insulator strings is broken for some reason, the wires can still be fixed for a short time to prevent the wires from falling off the pole tower and safety accidents. At the same time, two wire clamps are provided on each wire for fixing, which can disperse the stress on the wire and prevent the wire from being damaged due to excessive force. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0030] Figure 1 : One of the structural diagrams of Embodiment 1 of the present invention;

[0031] Figure 2 : The second structural diagram of embodiment 1 of the present invention;

[0032] Figure 3 : One of the structural diagrams of Embodiment 2 of the present invention;

[0033] Figure 4 : The second structural diagram of embodiment 2 of the present invention;

[0034] Figure 5 : One of the structural diagrams of Embodiment 3 of the present invention;

[0035] Figure 6 : The second structural diagram of embodiment 3 of the present invention;

[0036] Among them: 1- conductor, 2- upper connecting plate, 3- wire clamp, 4- lower connecting plate, 5- upper insulator string, 6- lower insulator string, 7- connecting rod. DETAILED DESCRIPTION

[0037] In order to better understand the present invention, the content of the present invention is further clearly described below in conjunction with the embodiments and the accompanying drawings, but the protection content of the present invention is not limited to the following embodiments. In the following description, a large number of specific details are provided to provide a more thorough understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without one or more of these details.

[0038] It should be noted that in the description of the present invention, the terms "top and bottom", "up and down", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific manner, and therefore cannot be understood as a limitation on the present invention.

[0039] Embodiment 1:

[0040] See also Figure 1-Figure 2 The horizontal double-split conductor wind deflection prevention fixing device provided in this embodiment includes an upper connecting plate 2, a lower connecting plate 4, an upper insulator string 5, a lower insulator string 6 and a wire clamp 3.

[0041] The upper connecting plate 2 is an isosceles triangle plate structure, located on the upper part of the conductor 1, vertically arranged, with the bottom side horizontal and spanning the two conductors 1; the three corners of the upper connecting plate 2 are all rounded, and connection holes are arranged at the three corners. The connection hole at the top corner of the upper connecting plate 2 is used to connect the upper insulator string 5, and the two connection holes at the bottom corner are used to connect the conductor 1, and the center distance between the two connection holes is equal to the center distance between the two conductors 1.

[0042] The lower connecting plate 4 is an inverted isosceles triangle plate structure, located at the lower part of the conductor 1, vertically arranged, with the top edge horizontal and crossing the two conductors 1; the three corners of the lower connecting plate 4 are all rounded, and connection holes are arranged at the three corners. The connection hole at the bottom corner of the lower connecting plate 4 is used to connect the lower insulator string 6, and the two connection holes at the top corner are used to connect the conductor 1, and the center distance between the two connection holes is equal to the center distance between the two conductors 1.

[0043] The upper insulator string 5 is vertically arranged and located on the upper part of the conductor 1, with the top end fixedly connected to the upper cross arm of the transmission line tower, and the bottom end fixedly connected to the connection hole at the top corner of the upper connecting plate 2. The lower insulator string 6 is vertically arranged and located on the lower part of the conductor 1, with the bottom end fixedly connected to the lower cross arm of the transmission line tower, and the top end fixedly connected to the connection hole at the bottom corner of the lower connecting plate 4.

[0044] The upper connecting plate 2 and the lower connecting plate 4 are located on the same vertical plane, and the lower connecting plate 4 is located directly below the upper connecting plate 2; a wire clamp 3 is fixedly connected between the two connecting holes at the bottom corners of the upper connecting plate 2 and the corresponding connecting holes at the top corners of the lower connecting plate 4, and the wire clamp 3 is used to fix the upper connecting plate 2 and the lower connecting plate 4 with the wire 1. The wire clamp 3 is fixedly connected to the wire 1 and is a gripping wire clamp.

[0045] This embodiment utilizes the upper and lower cross arms of the pole tower to fix the conductors through insulator strings, and adjusts the flexible connection of the conductors on the straight suspension tower to a rigid fixation, which can reduce the wind deviation angle during strong winds and prevent the conductors from affecting the safe operation of the power grid due to wind deviation.

[0046] Embodiment 2:

[0047] See also Figure 2-Figure 4 The horizontal double-split conductor wind deflection fixing device provided in this embodiment includes a lower connecting plate 4, an upper insulator string 5, a lower insulator string 6 and a wire clamp 3. Compared with embodiment 1, this embodiment does not have an upper connecting plate 2, but has two upper insulator strings 5.

[0048] The lower connecting plate 4 is an inverted isosceles triangle plate structure, located at the lower part of the conductor 1, vertically arranged, with the top edge horizontal and crossing the two conductors 1; the three corners of the lower connecting plate 4 are all rounded, and connection holes are arranged at the three corners. The connection hole at the bottom corner of the lower connecting plate 4 is used to connect the lower insulator string 6, and the two connection holes at the top corner are used to connect the conductor 1, and the center distance between the two connection holes is equal to the center distance between the two conductors 1.

[0049] The connection holes at the two top corners of the lower connecting plate 4 are fixedly provided with wire clamps 3 in the vertical upward direction, and the wire clamps 3 are used to fix the lower connecting plate 4 with the wire 1. The wire clamps 3 are fixedly connected with the wire 1 and are gripping wire clamps.

[0050] The lower insulator string 6 is vertically arranged and located at the lower part of the conductor 1, with the bottom end fixedly connected to the lower cross arm of the transmission line tower, and the top end fixedly connected to the connection hole at the bottom corner of the lower connecting plate 4. The upper insulator string 5 is vertically arranged and located at the upper part of the conductor 1, with the top end fixedly connected to the upper cross arm of the transmission line tower, and the bottom end fixedly connected to the wire clamp 3. In this embodiment, two upper insulator strings 5 ​​are arranged, which are connected to the wire clamp 3 one by one.

[0051] In this embodiment, the double insulator is suspended and fixed to the conductor by using double hanging points on the upper cross arm. Compared with the first embodiment, the double insulator can withstand higher tension, ensuring safe and reliable fixation of the conductor.

[0052] Embodiment 3:

[0053] See also Figure 5-Figure 6The horizontal double-split conductor wind deflection prevention fixing device provided in this embodiment comprises an upper connecting plate 2, a lower connecting plate 4, an upper insulator string 5, a lower insulator string 6 and a wire clamp 3. Compared with embodiment 2, two upper connecting plates 2 are provided in this embodiment.

[0054] The upper connecting plate 2 is an isosceles triangle plate structure, with two pieces, both located on the upper part of the conductor 1, arranged vertically side by side, with the bottom sides all horizontal and spanning the two conductors 1; the three corners of the upper connecting plate 2 are all rounded, and connection holes are provided at the three corners and the center of the bottom. The connection hole at the top corner of the upper connecting plate 2 is used to connect the upper insulator string 5, the two connection holes at the bottom corner are used to connect the conductor 1, and the center distance between the two connection holes is equal to the center distance between the two conductors 1, and the connection hole at the center of the bottom is used to connect the lower connecting plate 4.

[0055] The lower connecting plate 4 is an inverted isosceles triangle plate structure, located at the lower part of the conductor 1, vertically arranged, with the top edge horizontal, perpendicular to the upper connecting plate 2, and parallel to the conductor 1; the three corners of the lower connecting plate 4 are all rounded, and connection holes are arranged at the three corners. The connection hole at the bottom corner of the lower connecting plate 4 is used to connect the lower insulator string 6, and the two connection holes at the top corner are used to connect the upper connecting plate 2, and the center distance between the two connection holes is equal to the center distance between the two upper connecting plates 2.

[0056] The lower insulator string 6 is vertically arranged and located at the lower part of the conductor 1, with the bottom end fixedly connected to the lower cross arm of the transmission line tower, and the top end fixedly connected to the connection hole at the bottom corner of the lower connecting plate 4. The upper insulator string 5 is vertically arranged and located at the upper part of the conductor 1, with the top end fixedly connected to the upper cross arm of the transmission line tower, and the bottom end fixedly connected to the connection hole at the top corner of the upper connecting plate 2. In this embodiment, two upper insulator strings 5 ​​are arranged, which are connected to the upper connecting plate 2 one by one.

[0057] Two wire clamps 3 are arranged at the bottom of each upper connecting plate 2, and the wire clamps 3 are fixedly connected to the connection holes at the bottom corners of the upper connecting plate 2, and are used to fix the upper connecting plate 2 to the wire 1. The wire clamps 3 are fixedly connected to the wire 1 and are gripping wire clamps.

[0058] The lower connecting plate 4 is located directly below the two upper connecting plates 2. The connecting holes at the bottom centers of the two upper connecting plates 2 are fixedly connected one-to-one with the connecting holes at the top corners of the lower connecting plate 4 through connecting rods 7, and the connecting rods 7 are vertically arranged.

[0059] In this embodiment, the double-in-one insulator is suspended and fixed on the upper cross arm by using double hanging points. Compared with the second embodiment, each upper insulator string 5 provided in this embodiment suspends two conductors 1. Even if one of the upper insulator strings 5 ​​is broken for some reason, the conductors 1 can still be fixed for a short time to prevent the conductors 1 from falling off the pole tower. At the same time, two wire clamps 3 are provided on each conductor 1 to disperse the stress borne by the conductor and prevent the conductor from being damaged due to excessive force.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the present invention by ordinary technicians in the field should be included in the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solution of the present invention.

Claims

1. A horizontal double-split conductor wind deflection prevention fixing device, characterized in that: It includes an upper connecting plate, a lower connecting plate, an upper insulator string, a lower insulator string and a wire clamp; The upper connecting plate is located on the upper part of the conductor, is an isosceles triangle, is vertically arranged across the conductor, and has a horizontal bottom side; connection holes are arranged at the three corners of the upper connecting plate, the connection hole at the top corner is used to connect the upper insulator string, and the two connection holes at the bottom corner are used to connect the conductor; The lower connecting plate is located at the lower part of the conductor, is an inverted isosceles triangle, is vertically arranged along the conductor, and has a horizontal top edge; connection holes are arranged at the three corners of the lower connecting plate, the connection hole at the bottom corner is used to connect the lower insulator string, and the two connection holes at the top corner are used to connect the upper connecting plate; The upper insulator string is vertically arranged and located on the upper part of the conductor, with the top end fixedly connected to the upper cross arm and the bottom end fixedly connected to the connection hole at the top corner of the upper connecting plate; The lower insulator string is vertically arranged and located at the lower part of the conductor, with the bottom end fixedly connected to the lower cross arm and the top end fixedly connected to the connection hole at the bottom corner of the lower connecting plate; The wire clamps are arranged in pairs at the lower part of the upper connecting plate, fixedly mounted on the wires, and the tops are fixedly connected one-to-one with the two connecting holes at the bottom corners of the upper connecting plate; There are two upper connecting plates, two upper insulator strings, and two pairs of wire clamps; the upper connecting plates are arranged side by side, and the center distance between the two upper connecting plates is equal to the center distance between the connection holes at the two vertex corners of the lower connecting plate; A connecting hole is provided at the center position of the bottom of the upper connecting plate, and the connecting holes at two top corners of the lower connecting plate are fixedly connected one-to-one with the connecting block at the center of the bottom of the lower connecting plate through a connecting rod.

2. The horizontal double-split conductor wind deflection prevention fixing device according to claim 1, characterized in that: The center distance between the connection holes at the two bottom corners of the upper connecting plate is equal to the center distance between the two conductors.

3. The horizontal double-split conductor wind deflection prevention fixing device according to claim 2 is characterized in that: The connecting rod is arranged vertically.

4. The horizontal double-split conductor wind deflection prevention fixing device according to claim 3, characterized in that: The three corners of the upper connecting plate and the three corners of the lower connecting plate are all rounded.

5. The horizontal double-split conductor wind deflection prevention fixing device according to claim 4, characterized in that: The wire clamp is a clamping type wire clamp.

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