Electric transmission line anti-flashover insulating wrapping tape

Abstract

The utility model discloses an anti-flashover insulating wrapping tape for a power transmission line, and the wrapping tape comprises a tubular body of a multi-layer opening type roll-shaped structure, deformation spaces are reserved between the layers of the tubular body, the deformation spaces of the layers form a coherent installation channel, during installation, the opening of the tubular body is lapped on a wire, and the opening of the tubular body is lapped on the wire. According to the anti-flashover insulation wrapping tape, the lead is pushed and wound to open each layer of deformation space to reach the tail of the center along the mounting channel, the tubular body tightly wraps the lead by means of self-shaping internal stress, effective insulation protection is achieved, and by adopting the anti-flashover insulation wrapping tape, the traditional complex process of layer-by-layer winding is simplified into three-step operation of wire lapping, pushing and winding and shaping. According to the open type roll-shaped structure, the wire serves as a supporting framework, deformation spaces of all layers are automatically unfolded along a preset channel through pushing and winding actions, the winding distance and angle do not need to be manually controlled, the installation time is greatly shortened, and the requirement for the skill of installation personnel is remarkably reduced.

Description

Technical Field

[0001] This application belongs to the field of high-voltage line protection, and in particular relates to an anti-flashover insulating tape for power transmission lines. Background Technology

[0002] With the development of the power industry, the demand for safe and stable operation of the power system is becoming increasingly urgent. However, the equivalent salt concentration in various regions continues to rise, while the insulation configuration of power equipment is relatively declining. Frequent flashover accidents caused by complex external environments, such as pollution flashover, bird droppings flashover, wind deflection, and lightning strikes, threaten the safety of transmission lines. These accidents can cause intermittent power outages or even grid paralysis, resulting in economic losses and social impact.

[0003] To address flashover accidents, the power system implemented measures such as replacing silicone rubber composite insulators, applying anti-pollution flashover coatings to improve flashover resistance, installing bird spikes and bird deterrents to prevent bird damage, adding weights to suspension strings to stabilize conductors against wind deflection, and installing lightning rods to enhance lightning protection. However, long-term operation has revealed numerous problems: birds have gradually adapted to the bird-proofing equipment, the added auxiliary equipment hinders line maintenance, and the substantial investment has not achieved the expected results.

[0004] To address the aforementioned limitations, researchers have developed anti-flashover insulation sleeves. By bearing part or all of the high voltage of the high-voltage line, these sleeves provide localized insulation to the bare high-voltage conductors in areas prone to flashover accidents, fundamentally eliminating the conditions for flashover. However, most existing anti-flashover insulation sleeves employ a wrapping design, which has revealed significant problems in practical applications. Firstly, after prolonged use, the wrapped sleeve is prone to detachment. This is mainly due to material aging or poor wrapping techniques, resulting in gaps between the sleeve and the conductor, which can easily lead to interface breakdown under the influence of an electric field. Secondly, the installation process requires layer-by-layer wrapping, demanding high-precision manufacturing processes. Uneven wrapping and inconsistent sleeve thickness not only affect insulation performance but also increase the risk of flashover due to localized electric field concentration. Furthermore, the wrapped sleeve relies on manual operation, resulting in low efficiency and difficulty in ensuring long-term stability. Therefore, existing technologies require further improvement and enhancement. Utility Model Content

[0005] This utility model provides a flashover protection insulation tape for power transmission lines, which at least solves or alleviates one or more technical problems in the prior art, or at least provides a beneficial alternative.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A flashover protection insulating tape for power transmission lines includes a multi-layered open-type rolled tubular body with pre-reserved deformation spaces between each layer. The deformation spaces of each layer form a continuous installation channel. During installation, the opening of the tubular body is placed on the conductor, and the conductor is pushed around to open the deformation spaces of each layer and move along the installation channel to the center end. The tubular body tightly wraps the conductor with its own internal stress, achieving effective insulation protection.

[0008] By adopting the anti-flashover insulating tape of this application, the complex process of traditional layer-by-layer winding is simplified to a three-step operation of "laying wire - pushing and winding - shaping". The open-type coil structure uses the conductor itself as a supporting skeleton. Through the pushing and winding action, the deformation space of each layer is automatically unfolded along the preset channel, eliminating the need for manual control of the winding spacing and angle, greatly shortening the installation time and significantly reducing the skill requirements of the installers. The tubular body is made of polymer materials (insulating materials, hydrophobic materials, wear-resistant materials, etc.) through a high-temperature shaping process, giving the tubular body "memory elasticity". During the pushing and winding process, the conductor will evenly expand the deformation space of each layer, triggering the elastic recovery force of the material, forming a radial contraction force from the inside out to tightly wrap the conductor. The wrapping uniformity is high, and this uniform wrapping effectively avoids local electric field distortion.

[0009] In the preferred implementation, the thickness of a single tubular layer is 188 μm.

[0010] In the preferred implementation, the breakdown voltage of the single-layer tubular body is 23.5KV.

[0011] In a preferred embodiment, the volume resistivity of the single-layer tubular body is 5E+17Ω·m.

[0012] In the preferred implementation, the tensile strength of the single-layer tubular body is 188 MPa in the transverse direction (MD) and 194 MPa in the longitudinal direction (TD).

[0013] In the preferred implementation, the elongation at break of the single-layer tubular body is 179% in the transverse direction (MD) and 143% in the longitudinal direction (TD).

[0014] In the preferred implementation, the wear resistance of a single-layer tubular body is greater than that of an aluminum-clad tape.

[0015] In a preferred implementation, after the tubular body is installed on the outside of the conductor, the distance l from the outer layer of the tubular body to the outer layer of the conductor satisfies 1mm≤l≤8mm, so as to adapt to the conductor diameter of different specifications and voltage levels.

[0016] In a preferred implementation, after the tubular body is installed, an aluminum cladding is wrapped around the outside of the tubular body.

[0017] In a preferred implementation, multiple tubular bodies are connected end to end, and a larger tubular body is wrapped around the interface to achieve the connection of multiple tubular bodies.

[0018] The above structure has the following beneficial effects:

[0019] Utilizing the self-supporting characteristics of the open-type roll structure, the wrapping tape is simply placed on the conductor and pushed around. The pre-set deformation space of each layer automatically unfolds and, after installation, the internal stress is set and the wrapping is tight, making it difficult to detach. This improves installation efficiency, enhances the uniformity of the electric field distribution of the insulation layer, effectively prevents flashover faults caused by bird droppings short-circuiting air gaps (more than 90% of bird-related faults), effectively prevents wind-induced discharge, solves the problem of insufficient safety distance, improves the anti-pollution flashover capability of transmission lines, improves the lightning resistance level of transmission lines, and results in a more uniform voltage distribution. It is also more suitable for composite insulator lines and can reduce line losses in operation. Attached Figure Description

[0020] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain this application and do not constitute an undue limitation of the present invention. In the drawings:

[0021] Figure 1 A schematic three-dimensional structural diagram of one embodiment of the anti-flashover insulation tape for transmission lines of this application is shown;

[0022] Figure 2 This illustration shows an installation diagram of one embodiment of the transmission line anti-flashover insulation tape installation conductor of this application;

[0023] Figure 3 The diagram illustrates an interface structure of one embodiment of the anti-flashover insulation tape and conductor in this application for transmission lines.

[0024] Figure 4 A schematic three-dimensional structural diagram of one embodiment of the transmission line anti-flashover insulation tape after installation is shown.

[0025] Label Explanation:

[0026] 1. Tubular body; 10. Deformation space; 2. Conductor; 3. Vibration damper. Detailed Implementation

[0027] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit and scope of this invention. Therefore, the drawings and description are considered exemplary in nature and not restrictive.

[0028] In the description of this utility model, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In this utility model, unless otherwise expressly specified and limited, the first feature being "upper" or "lower" than the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium.

[0029] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral unit; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. However, specifying a direct connection indicates that the two main bodies at the connection point are not connected by an intermediate structure, but are simply connected to form a whole through a connecting structure. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0030] In this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature.

[0031] The present invention will now be described with reference to the accompanying drawings.

[0032] The specific solution adopted is as follows:

[0033] like Figure 1-4 As shown, this utility model provides a flashover protection insulation tape for power transmission lines, including a multi-layered open-type rolled tubular body 1. Deformation spaces 10 are reserved between each layer of the tubular body 1, and the deformation spaces of each layer form a continuous installation channel. During installation, the opening of the tubular body is placed on the conductor 2, and the conductor is pushed and wound to open the deformation spaces of each layer and come to the center end along the installation channel. The tubular body tightly wraps the conductor with its own shaping internal stress, so as to achieve effective insulation protection.

[0034] By adopting the anti-flashover insulating tape of this application, the complex process of traditional layer-by-layer winding is simplified to a three-step operation of "laying wire - pushing and winding - shaping". The open-type coil structure uses the conductor itself as a supporting skeleton. Through the pushing and winding action, the deformation space of each layer is automatically unfolded along the preset channel, eliminating the need for manual control of the winding spacing and angle, greatly shortening the installation time and significantly reducing the skill requirements of the installers. The tubular body is made of polymer materials (insulating materials, hydrophobic materials, wear-resistant materials, etc.) through a high-temperature shaping process, giving the tubular body "memory elasticity". During the pushing and winding process, the conductor will evenly expand the deformation space of each layer, triggering the elastic recovery force of the material, forming a radial contraction force from the inside out to tightly wrap the conductor. The wrapping uniformity is high, and this uniform wrapping effectively avoids local electric field distortion.

[0035] The main characteristics of the multilayer tubular structure in this application are as follows: the thickness of a single layer of tubular structure is only 188um, which significantly reduces the mass per unit length while maintaining electrical performance, thereby reducing the load on the conductor. The breakdown voltage of a single layer of tubular structure is 23.5KV, forming a "basic insulation unit". A linearly growing insulation system can be constructed by adjusting the number of layers. The volume resistivity of a single layer of tubular structure is 5E+17Ω·m. The ultra-high volume resistivity of 5E+17Ω·m ensures that each layer can form an independent and effective insulation barrier.

[0036] This product boasts exceptional electrical performance. Taking a product suitable for 110kV voltage levels as an example: it is 180mm long, 2mm thick, and has a power frequency breakdown voltage of 86kV, far exceeding the actual required rated phase voltage of 63kV for this voltage level. Even when the insulator string and the surrounding air are completely short-circuited by falling bird droppings, it can independently withstand the entire phase voltage to ground of the line for more than 10 seconds, while the moment the bird droppings fall only lasts 3-5 seconds.

[0037] The tensile strength of the single-layer tubular material is 188 MPa in the transverse direction (MD) and 194 MPa in the longitudinal direction (TD). The elongation at break is 179% in the transverse direction (MD) and 143% in the longitudinal direction (TD). The difference in tensile strength between 188 MPa in the transverse direction (MD) and 194 MPa in the longitudinal direction (TD) is significant. The pushing and wrapping action during installation primarily generates axial (longitudinal) tensile stress. The high strength of 194 MPa can withstand concentrated forces applied by installers, while the moderate transverse strength (188 MPa) ensures that the tape can extend uniformly along the conductor radially, avoiding brittle fracture caused by localized stress concentration. The elongation at break of 179% (MD) / 143% (TD) gives the material "rubber-like" ductility. During installation, when there are tolerances in the conductor diameter or localized bending, the tape can achieve adaptive fitting through large deformation (transverse elongation exceeding 100%), without breaking like traditional brittle materials.

[0038] The tubular wrapping tape exhibits excellent weather resistance and can operate continuously in environments ranging from -40℃ to 120℃. Tested by the State Key Laboratory of Electrical Insulation for Power Equipment at Xi'an Jiaotong University, the accelerated light aging and electrical aging life of a single layer of this product are both greater than 5 years. Due to its multi-layered roll structure, its actual service life is at least 10 years.

[0039] After the tubular body is installed on the outside of the conductor, the distance l from the outer layer of the tubular body to the outer layer of the conductor must satisfy 1mm≤l≤8mm to accommodate conductor diameters of different specifications and voltage levels. The table below shows the corresponding specifications of the wrapping tape for different voltage levels:

[0040] Applicable voltage level Specifications and Models Breakdown strength Insulation thickness Product weight 35KV SD-35 ≥25KV ≤1mm ≤0.245kg / piece 110KV SD-110 ≥73KV ≤2mm ≤0.475kg / piece 220KV SD-220 ≥146KV ≤4mm ≤1kg / piece 330KV SD-330 ≥363KV ≤8mm ≤2kg / piece

[0041] After the product was installed, the voltage distribution of 110kV to 330kV porcelain and composite insulator strings was significantly improved. The voltage of the insulator closest to the conductor decreased by more than 70%, the electric field strength of the insulator string was weakened, and the voltage distribution of each insulator became more uniform.

[0042] After the line is equipped with this product, it is equivalent to adding 2 to 3 insulators to the insulator string, which can greatly improve the anti-pollution flashover capability of the transmission line.

[0043] Installing it under the crossarm of a straight-line tower, along the guide wire of a tension tower, or in areas prone to discharge between conductors and ground wires can effectively solve the problems of wind-induced flashover and insufficient safety distances in straight-line and tension towers. Alternatively, it can be installed where the safety distance between energized high-voltage bare conductors and buildings, tree canopies, rocks, or communication lines is insufficient, as well as where energized high-voltage bare conductors of different voltage levels cross at three-dimensional intersections, to improve the local insulation level of transmission lines and effectively solve the problem of insufficient safety distances. It can also address the defects caused by the small gaps in the assembly of equipment using a dense tower design.

[0044] After installing this product, its surge voltage resistance level increased by at least 10%. The standard positive polarity lightning surge voltage test result was: withstood 1.1U50 repeated 15 times. Theoretically speaking, if a type of transmission line flashover protection insulation tape were installed on all straight towers of the line, it would only be necessary to omit the first tower at the substation outlet at both ends of the line, artificially creating a bottleneck effect. This would make these two towers, as well as the tension towers in the line, the main discharge channels for lightning current, which would facilitate the rapid identification of lightning fault points and the quick restoration of power supply.

[0045] It overcomes the defect that equipotential rings are more prone to bird droppings flashover in composite insulator lines, and is more suitable for composite insulator lines.

[0046] The longer the transmission line and the higher the voltage level, the greater the power loss due to the long line effect. However, by insulating the conductors below the insulator string with a transmission line anti-flashover insulation tape, which is equivalent to a cable end, the loss caused by the insulator string and fittings can be effectively solved, thereby reducing the equipment line loss rate.

[0047] ① Install at the suspension part of the straight-line tower

[0048] During construction, first connect the two anti-vibration hammers 3 at both ends with special insulating rope loops (diameter 400mm-600mm, load capacity 8 or 9 tons), and then connect them to the hooks of the manual hoists. Then pull the manual hoists to lift the conductor until the weight of the conductor carried by the porcelain string is completely transferred to the two manual hoists. After that, open the original clamp below the porcelain string, remove the aluminum sheathing, and place the opening of a type of transmission line anti-flashover insulating sheathing on the conductor. Wrap it around the conductor 2 several times until it is firmly wrapped on the conductor by its own internal stress. Then, put the aluminum sheathing back in the original clamp, put the original clamp back in, loosen and remove the two manual hoists, and then remove the two insulating rope loops. The installation work is now complete.

[0049] ② For installation on the lead-in line, suspend both sides of the part of the lead-in line to be installed, straighten it, and then wrap a type of transmission line anti-flashover insulation tape around the conductor. If the length of a single tape is insufficient, multiple tapes can be connected end to end, and then half a piece of transmission line anti-flashover insulation tape (preferably one size larger) can be cut and wrapped around the joint.

[0050] ③ Install "a type of anti-flashover insulating tape for transmission lines" on the long section of conductor between two towers.

[0051] During construction, the power should be off, and workers should be transported to the appropriate location on the conductor using a cable hoist before installing the insulation tape. When multiple insulation tapes need to be connected, the splicing method is the same as that used for the drain wire.

[0052] All installations must be carried out under power-off conditions. When used to prevent flashover from bird droppings, the installation location of the product must not be changed, and cutting the wire during installation is strictly prohibited. The manual hoist used in construction should have sufficient strength to support the weight of the conductor. If a dedicated insulating rope loop is unavailable, a wire clip and shackle can be used together, or a temporary clamp can be installed. If the original clamp's slot cannot accommodate a conductor wrapped with both anti-flashover insulation tape and aluminum tape, a larger clamp should be used.

[0053] The following table shows the applicable suspension clamps for installing "anti-flashover insulation tape on transmission lines":

[0054]

[0055] For any parts not mentioned in this utility model, existing technologies can be used or referenced.

[0056] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this utility model, and these should all be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A flashover-proof insulating tape for power transmission lines, characterized in that, It includes a multi-layered open-type coiled tubular structure with pre-reserved deformation space between each layer. The deformation space of each layer forms a continuous installation channel. During installation, the opening of the tubular structure is placed on the conductor, and the conductor is pushed and wound to open up the deformation space of each layer and come to the center end along the installation channel. The tubular structure relies on its own shaping internal stress to tightly wrap the conductor, achieving effective insulation protection.

2. The anti-flashover insulating tape for transmission lines according to claim 1, characterized in that, The thickness of a single layer of tubular material is 188 μm.

3. The anti-flashover insulating tape for transmission lines according to claim 1, characterized in that, The breakdown voltage of a single-layer tubular structure is 23.5 kV.

4. The anti-flashover insulating tape for transmission lines according to claim 1, characterized in that, The volume resistivity of a single-layer tubular structure is 5E+17Ω·m.

5. The anti-flashover insulating tape for transmission lines according to claim 1, characterized in that, The tensile strength of a single-layer tubular structure is 188 MPa in the transverse direction (MD) and 194 MPa in the longitudinal direction (TD).

6. The anti-flashover insulating tape for transmission lines according to claim 1, characterized in that, The elongation at break of the single-layer tubular structure was 179% in the transverse direction (MD) and 143% in the longitudinal direction (TD).

7. The anti-flashover insulating tape for transmission lines according to claim 1, characterized in that, The wear resistance of a single-layer tubular material is greater than that of an aluminum-clad tape.

8. The anti-flashover insulating tape for transmission lines according to claim 1, characterized in that, After the tubular body is installed on the outside of the conductor, the distance l from the outer layer of the tubular body to the outer layer of the conductor must satisfy 1mm≤l≤8mm to accommodate conductor diameters of different specifications and voltage levels.

9. The anti-flashover insulating tape for transmission lines according to claim 1, characterized in that, After the tubular body is installed, aluminum cladding tape is wrapped around the outside of the tubular body.

10. The anti-flashover insulating tape for transmission lines according to claim 1, characterized in that, Multiple tubular structures are connected end to end, with a larger tubular structure wrapped around the joints to achieve the connection between the multiple tubular structures.

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