10kv cold-resistant tensile cross-linked polyethylene insulated overhead cable

Abstract

The present application relates to overhead cable technical field, propose a kind of 10kV cold-resistant tensile type crosslinked polyethylene insulation overhead cable, including conductor, conductor outside is sequentially covered with inner shield layer, crosslinked polyethylene insulation layer and outer shield layer, conductor is composed of several single wires twisted in the outer periphery of metal reinforcing core, it further include sheath layer, force positioning ring and snow removal assembly, outer shield layer outside is provided with sheath layer, sheath layer outside is arranged with several force positioning rings, snow removal assembly is arranged between every two adjacent force positioning rings, when there is snow on sheath layer, automatically trigger snow removal assembly in windy environment, remove the snow on sheath layer, by the above technical scheme, solve the problem that when overhead cable is in cold harsh environment operation, due to the influence of snow and ice, it bears a lot of tension and increases the risk of frost heaving cracking in prior art.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of overhead cables, in particular to a 10kV cold-resistant tensile cross-linked polyethylene insulated overhead cable. BACKGROUND

[0002] An overhead cable is an overhead conductor with an insulating layer and a protective outer skin, which is a new power transmission method between overhead conductors and underground cables. Overhead cables can be divided into hard aluminum wire structure, hard drawn copper wire structure, aluminum alloy wire structure, steel core or aluminum alloy core support structure, and self-supporting three-core twisted structure, etc. according to their structures. Overhead insulated cables have the main characteristics of high power supply reliability, good power supply safety, convenient erection and maintenance, and reasonable economy, and are mainly used in telecommunication systems or power transmission.

[0003] Since the electric wire and cable are generally overhead in the outdoor environment, the surface thereof is easily covered with ice and snow under the influence of the environment, which will increase the vertical load of the cable, increase the sag, test the tensile strength of the cable itself and the bearing capacity of the tower, and when the weight of the accumulated snow exceeds the bearing capacity of the electric wire and cable, the cable will be mechanically damaged, and even the fittings will be damaged. Especially with the accumulation of snow, when the snow reaches a certain thickness or the snow melts, not only will the cable be compressed, but also ice will be formed on the cable, which will increase the possibility of cable fluttering in a windy environment, and when the snow melts and freezes again, it will also invade the small cracks in the cable and cause repeated frost heaving, thereby expanding the damage to the cable and affecting the service life and reliability of the cable. SUMMARY

[0004] The present application provides a 10kV cold-resistant tensile cross-linked polyethylene insulated overhead cable to solve the problem that the overhead cable is affected by snow and ice when it is operated in a cold and harsh environment, resulting in a large amount of tensile force and an increased risk of frost heaving and cracking.

[0005] The technical scheme of the present application is as follows:

[0006] A 10kV cold-resistant tensile cross-linked polyethylene insulated overhead cable, comprising a conductor, wherein the conductor is externally covered with an inner shielding layer, a cross-linked polyethylene insulating layer and an outer shielding layer in sequence, and the conductor is composed of a plurality of single wires twisted around a metal reinforcing core.

[0007] The metal reinforcing core is used to support the weight of the cable and bear a certain tensile force;

[0008] A sheath layer is arranged outside the outer shielding layer to protect the internal structure of the cable.

[0009] A force-bearing positioning ring is arranged outside the sheath layer.

[0010] The force-bearing positioning ring can be provided in a split type for facilitating installation.

[0011] A snow removal assembly is arranged between every two adjacent force-bearing positioning rings, and the snow removal assembly is automatically triggered to remove the snow on the sheath layer in a windy environment when the snow exists on the sheath layer.

[0012] On the basis of the foregoing scheme, the sheath layer comprises an inner sheath layer, a tensile interlayer and an outer sheath layer, the outer shielding layer is sequentially coated with the inner sheath layer, the tensile interlayer and the outer sheath layer from outside, and the tensile interlayer is used together with the metal reinforcing core to resist the tensile force in the length direction of the cable.

[0013] On the basis of the foregoing scheme, the tensile interlayer is wound by a plurality of foamed polyethylene bands, and each foamed polyethylene band is internally provided with a tensile band for resisting the tensile force.

[0014] On the basis of the foregoing scheme, the snow removal assembly comprises:

[0015] An elastic snow removal member is arranged between every two force-bearing positioning rings.

[0016] A positioning structure is arranged on each force-bearing positioning ring, and is used to fix the position of the elastic snow removal member but does not limit the self-deformation of the elastic snow removal member.

[0017] On the basis of the foregoing scheme, the positioning structure comprises a positioning column, two positioning columns are symmetrically and fixedly installed at the bottom of each force-bearing positioning ring, a clamping ring groove is formed in each positioning column, and the two ends of the elastic snow removal member are respectively provided with a fixing rope for being connected with the positioning column, and the fixing rope is connected with the clamping ring groove.

[0018] On the basis of the foregoing scheme, the elastic snow removal member is composed of a plurality of spiral strips, and a gravity ball is fixedly installed at the connecting position between every two spiral strips.

[0019] The spiral strip has elasticity.

[0020] On the basis of the foregoing scheme, the part of each spiral strip away from the gravity ball is in sliding abutment with the outer sheath layer.

[0021] On the basis of the foregoing scheme, an arc-shaped ring groove is coaxially formed in each force-bearing positioning ring, and the arc-shaped ring groove is used to accommodate a special lifting hook of a lifting line.

[0022] The working principle and beneficial effects of the present application are as follows:

[0023] 1. In this invention, the metal reinforcing core serves to withstand tensile forces. Simultaneously, the tensile interlayer is composed of several foamed polyethylene tapes wound together, each tape containing a tensile strip designed to resist tensile forces. Through the action of the tensile strips, the tensile strips work in conjunction with the internal metal reinforcing core to form a distributed tensile structure, facilitating improved overall tensile strength. Furthermore, the foamed polyethylene tapes possess excellent thermal insulation properties, mitigating the impact of external low-temperature environments on the internal conductors. This ensures that the cross-linked polyethylene insulation layer and conductor within the cable maintain stable electrical performance, thereby enhancing overall tensile strength and cold resistance.

[0024] 2. In this invention, the gravity ball is located below the elastic snow removal component. When the gravity ball is affected by natural wind, the ball swings. At this time, the spiral strip extends and oscillates, thereby scraping the snow-covered part of the outer sheath layer through the inner side of the spiral strip, clearing away the snow, and preventing the snow from melting and causing icing, thus improving the cold resistance of the cable.

[0025] 3. In this invention, the combination of the sheath layer and the internal metal reinforcing core combines the central tensile strength with the distributed reinforcement structure, thereby improving the cable's ability to resist tensile forces. With the snow removal component, the snow is removed before it melts under the action of natural wind, thus avoiding the formation of ice and preventing repeated freezing and swelling damage to the cable. This not only reduces the tensile force on the cable but also improves the cable's cold resistance. Attached Figure Description

[0026] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0027] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 This is a schematic diagram of the overall structure from another angle in this invention;

[0029] Figure 3 This is a schematic diagram of the structure of the conductor, inner shielding layer, cross-linked polyethylene insulation layer, outer shielding layer and sheath layer in this invention.

[0030] Figure 4 This is a schematic diagram of the structure of the foamed polyethylene tape and tensile tape in this invention.

[0031] Figure 5 This is a schematic diagram of the snow removal component in this invention;

[0032] Figure 6 This is a schematic diagram of the elastic snow removal component in this invention;

[0033] Figure 7Structure diagram of the positioning structure in the application.

[0034] In the figure: 1, conductor; 101, metal reinforcing core; 102, single wire; 2, inner shielding layer; 3, cross-linked polyethylene insulation layer; 4, outer shielding layer; 5, force positioning ring; 6, inner sheath layer; 7, tensile interlayer; 701, foamed polyethylene tape; 702, tensile tape; 8, outer sheath layer; 9, elastic snow removal component; 901, spiral strip; 902, gravity ball; 10, positioning column; 11, clamping ring groove; 12, fixed rope; 13, arc ring groove. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the embodiments of the application. Obviously, the described embodiments are only a part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by a person of ordinary skill in the art without creative work are within the protection scope of the application.

[0036] As Figures 1 to 7 shown, the embodiment provides a 10kV cold-resistant tensile cross-linked polyethylene insulated overhead cable, which comprises a conductor 1, and the conductor 1 is sequentially coated with an inner shielding layer 2, a cross-linked polyethylene insulation layer 3 and an outer shielding layer 4 from outside, the conductor 1 is composed of a plurality of single wires 102 twisted on the outer periphery of a metal reinforcing core 101, wherein the metal reinforcing core 101 is provided as a tensile load-bearing steel wire, and the cable further comprises a sheath layer, a force positioning ring 5 and a snow accumulation removing assembly, wherein the metal reinforcing core 101 is used for supporting the weight of the cable itself and bearing a certain tensile force, the outer shielding layer 4 is provided with the sheath layer outside, which is used for protecting the internal structure of the cable and simultaneously dispersing the tensile force along the length direction of the cable, the sheath layer comprises an inner sheath layer 6, a tensile interlayer 7 and an outer sheath layer 8, the outer shielding layer 4 is sequentially coated with the inner sheath layer 6, the tensile interlayer 7 and the outer sheath layer 8 from outside, and the tensile interlayer 7 is used together with the metal reinforcing core 101 to resist the tensile force along the length direction of the cable, wherein the tensile interlayer 7 is formed by winding a plurality of foamed polyethylene tapes 701, and each foamed polyethylene tape 701 is provided with a tensile tape 702 inside for resisting the tensile force, wherein the tensile tape is a belt-shaped object woven by high-strength synthetic fibers.

[0037] It should be noted that before the construction of the cable, the construction of the pole needs to be carried out first, at this time, according to the design drawing, the terrain and objects are surveyed, the pole positions of the starting point, corner point and terminal point of the line are determined, and finally the positions of the intermediate pole and the reinforcing pole are determined and the stakes are inserted, then the foundation pit is excavated according to the surrounding environment and the soil, then the pole is installed (the commonly used pole erection methods are: crane pole erection, tripod pole erection, inverted pole erection and foot pole erection, select the appropriate pole erection method according to the needs), then install the cross arm on the pole, and pay attention to installing it on the load side, that is, in the opposite direction of the power supply. In addition, for branch poles, corner poles, terminal poles, etc., pay attention to installing the cross arm on the opposite side of the wire tension.

[0038] When erecting the cable, the cable is laid out and erected on the cross arm, after the cable is laid out, the sag is adjusted to meet the design requirements by the tightener, then at the pole tower, the cable is anchored by using the strain clamp or the matching fixing hardware, and the reliability of the wire is ensured, then the load-bearing positioning ring 5 is installed at a certain distance, and the snow removal assembly is installed between every two adjacent load-bearing positioning rings 5, until the erection of the cable is completed.

[0039] Further, through the setting of the metal reinforcing core 101 and the tensile layer 7, the cable itself has sufficient mechanical strength, that is, the cable can be directly suspended on the pole cross arm, but in some occasions with large span, or in some environments with frequent strong winds and snow, in order to ensure the safety of the cable, a guy wire is also needed to enhance the carrying capacity of the cable. When the guy wire is needed, the guy wire (usually galvanized steel wire) is fixed on the pole by using the line grip, wedge clamp and other hardware, (for long distance lines, the guy wire itself also needs support, and the support point interval is generally not more than 15 meters), then after the cable is laid out, the cable is suspended under the guy wire by using the special hook or binding wire (the interval is generally 0.5-1 meter, and the actual interval can be adjusted according to the actual situation).

[0040] Among them, in order to facilitate the installation of the load-bearing positioning ring 5, the load-bearing positioning ring 5 can also be set as a split type, which is spliced on the outer sheath layer 8 during installation, and is fixed by using adhesion or other methods, that is, the installation of the load-bearing positioning ring 5 is completed.

[0041] Specifically, when there is snow on the cable, the existence of snow will also increase the weight of the cable and generate additional tension, and the melting of snow will also generate icing, at this time, under the action of wind force, the cable will be subjected to lateral tension, and the size of the wind load depends on factors such as wind speed, cable shape and medium density. In areas with high wind speed, especially when there is snow or icing on the outer sheath layer 8 of the cable, the influence of wind load on the cable is more obvious, thereby exerting excessive tension on the cable.

[0042] Through the setting of the metal reinforcing core 101 (that is, the tensile load-bearing steel wire, the diameter of which can be selected according to the environment), the tensile force is borne, and through the setting of the tensile layer 7, the tensile layer 7 is wound by a plurality of foamed polyethylene bands 701, each of which is provided with a tensile band 702 for resisting the tensile force, and through the buffering effect of the foamed polyethylene band 701, the external extrusion or impact can be absorbed to protect the cross-linked polyethylene insulation layer 3 and the conductor 1 inside, and through the effect of the tensile band 702, the tensile band 702 cooperates with the metal reinforcing core 101 inside to form a distributed tensile structure, which facilitates to improve the overall tensile capacity.

[0043] Further, due to the foamed structure of the foamed polyethylene band 701, it has good flexibility, and at the same time, the foamed polyethylene band 701 has good heat insulation, thereby relieving the influence of the external low-temperature environment on the internal conductor 1 and ensuring that the cable maintains stable electrical performance.

[0044] Through the setting of the snow removal assembly, when there is snow on the outer sheath layer 8, the snow removal assembly is actuated by the influence of natural wind, and the snow is scraped off before it melts, thereby avoiding the generation of ice coating and improving the cold resistance of the cable itself. At the same time, due to the reduction of snow and ice, the influence of wind on the cable can also be weakened, thereby relieving the tension on the cable. Through the setting of the hanging line, the hanging line is connected to the force-bearing positioning ring 5 through a special hook or a binding line, which not only enhances the load-bearing capacity of the cable, but also reduces the pressure of the snow removal assembly acting on the cable.

[0045] As shown in Figure 5 , Figure 6 , Figure 7 , a plurality of force-bearing positioning rings 5 are arranged at intervals outside the sheath layer, and a snow removal assembly is arranged between every two adjacent force-bearing positioning rings 5. When there is snow on the sheath layer, the snow removal assembly is automatically triggered in a windy environment to remove the snow on the sheath layer. The snow removal assembly comprises an elastic snow removal member 9 and a positioning structure. The elastic snow removal member 9 is arranged between every two adjacent force-bearing positioning rings 5, and the positioning structure is arranged on each force-bearing positioning ring 5 to fix the position of the elastic snow removal member 9, but does not limit the deformation of the elastic snow removal member 9 itself.

[0046] Specifically, when installing the elastic snow removal member 9, the elastic snow removal member 9 is installed between two adjacent force-bearing positioning rings 5 through the action of the positioning structure. This step is repeated until the installation of all elastic snow removal members 9 is completed. When there is snow on the outer sheath layer 8, the elastic snow removal member 9 can be driven to act by the action of natural wind, so that the snow on the outer sheath layer 8 can be removed.

[0047] As shown in Figure 5, Figure 6 , Figure 7 As shown above, the positioning structure includes positioning posts 10. Each load-bearing positioning ring 5 has two positioning posts 10 symmetrically and fixedly installed at its bottom. Each positioning post 10 has a snap-fit ​​ring groove 11. The two ends of the elastic snow removal component 9 are respectively provided with fixing ropes 12 for connecting with the positioning posts 10. The fixing ropes 12 are connected to the snap-fit ​​ring grooves 11.

[0048] Specifically, when installing the elastic snow removal component 9, it is fitted onto the outer sheath layer 8 and positioned between two adjacent load-bearing positioning rings 5. At this time, the fixing ropes 12 at both ends of the elastic snow removal component 9 correspond to the positioning posts 10 at the bottom of the two load-bearing positioning rings 5, respectively. Then, the fixing ropes 12 are wound around and installed on the snap ring grooves 11 on the corresponding positioning posts 10.

[0049] like Figure 5 , Figure 6 , Figure 7 As shown above, the elastic snow removal component 9 consists of several spiral strips 901. The spiral strips 901 are made of elastic materials, such as engineering plastics. The spiral strips 901 are elastic. A gravity ball 902 is fixedly installed at the connection position between every two spiral strips 901. The part of each spiral strip 901 away from the gravity ball 902 slides against the outer sheath layer 8. Each load-bearing positioning ring 5 has an arc-shaped ring groove 13 coaxially formed on it. The arc-shaped ring groove 13 is used to accommodate a special hook for the suspension line.

[0050] Specifically, after the elastic snow removal component 9 is installed, the gravity ball 902 is located below the elastic snow removal component 9. When the gravity ball 902 is affected by natural wind, the ball swings, and the spiral strip 901 extends, retracts and swings. This causes the inner side of the spiral strip 901 to scrape the snow-covered parts of the outer sheath layer 8, clearing away the snow and preventing icing after the snow melts, thereby improving the cold resistance of the cable.

[0051] The working principle or usage process of this application is as follows:

[0052] When there is snow on the cable, the presence of snow will increase the weight of the cable and generate additional tension. The melting of snow will also cause icing. At this time, under the action of wind, the cable will be subjected to lateral tension. The magnitude of wind load depends on factors such as wind speed, cable shape and medium density. In areas with high wind speed, especially when there is snow or ice on the outer sheath layer 8 of the cable, the wind load has a more obvious effect on the cable, thus applying excessive tension to the cable.

[0053] At this time, the metal reinforcing core 101 is arranged to bear the tensile force, and the tensile-resistant layer 7 is arranged, and the tensile-resistant layer 7 is wound by a plurality of foamed polyethylene bands 701, each of which is provided with a tensile-resistant band 702 for resisting the tensile force, and the foamed polyethylene band 701 can absorb external extrusion or impact to protect the cross-linked polyethylene insulation layer 3 and the conductor 1, and the tensile-resistant band 702 cooperates with the metal reinforcing core 101 to form a distributed tensile-resistant structure, thereby improving the overall tensile resistance, and the foamed polyethylene band 701 has good heat insulation, thereby reducing the influence of the external low-temperature environment on the conductor 1, and ensuring the stable electrical performance of the cable.

[0054] When the outer sheath layer 8 is covered with snow, the gravity balls 902 are affected by the natural wind, and the gravity balls 902 sway, and the spiral strips 901 also stretch and sway, thereby scraping the snow on the outer sheath layer 8 through the inner side of the spiral strips 901, and the snow is removed before it melts, thereby avoiding the generation of ice, improving the cold resistance of the cable itself, and reducing the influence of wind on the cable, thereby reducing the tensile force on the cable, and the hanging line is connected to the force-bearing positioning ring 5 through a special hook or a binding line, thereby enhancing the load-bearing capacity of the cable and reducing the pressure of the elastic snow-removing member 9 on the cable.

[0055] The above is only a preferred embodiment of the present application, and is not used to limit the present application, and any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A 10kV cold-resistant and tensile-resistant cross-linked polyethylene insulated overhead cable, comprising a conductor (1), wherein the conductor (1) is sequentially covered with an inner shielding layer (2), a cross-linked polyethylene insulation layer (3), and an outer shielding layer (4), characterized in that, The conductor (1) consists of several single wires (102) stranded around the outer periphery of a metal reinforcing core (101), and also includes: The metal reinforcing core (101) is used to support the weight of the cable itself and withstand a certain tensile force; Sheath layer, the outer shielding layer (4) is provided with the sheath layer outside, for protecting the internal structure of the cable; The sheath layer includes an inner sheath layer (6), a tensile interlayer (7), and an outer sheath layer (8). The outer shielding layer (4) is sequentially covered with the inner sheath layer (6), the tensile interlayer (7), and the outer sheath layer (8). The tensile interlayer (7) and the metal reinforcing core (101) are used together to resist the tensile force along the length of the cable. Load-bearing positioning rings (5), a plurality of load-bearing positioning rings (5) are arranged at intervals on the outside of the sheath layer; Snow removal assembly: A snow removal assembly is provided between every two adjacent load-bearing positioning rings (5). When there is snow on the sheath layer, the snow removal assembly is automatically triggered in a windy environment to remove the snow on the sheath layer. The snow removal component includes: Elastic snow removal component (9), with the elastic snow removal component (9) provided between every two load-bearing positioning rings (5); The positioning structure is provided on each of the load-bearing positioning rings (5) to fix the position of the elastic snow removal component (9) but does not restrict the deformation of the elastic snow removal component (9). The elastic snow removal component (9) is composed of several spiral strips (901), and a gravity ball (902) is fixedly installed at the connection position between every two spiral strips (901). The spiral strip (901) is elastic; The portion of each of the spiral strips (901) away from the gravity ball (902) slides against the outer sheath layer (8).

2. The 10kV cold-resistant and tensile-strength cross-linked polyethylene insulated overhead cable according to claim 1, characterized in that, The tensile interlayer (7) is formed by winding several foamed polyethylene strips (701), and each foamed polyethylene strip (701) is provided with a tensile strip (702) for resisting tensile force.

3. A 10kV cold-resistant and tensile-strength cross-linked polyethylene insulated overhead cable according to claim 2, characterized in that, The positioning structure includes positioning posts (10). Each load-bearing positioning ring (5) has two positioning posts (10) symmetrically and fixedly installed at its bottom. Each positioning post (10) has a snap-fit ​​ring groove (11). The elastic snow removal component (9) has a fixing rope (12) at both ends for connecting to the positioning post (10). The fixing rope (12) is connected to the snap-fit ​​ring groove (11).

4. A 10kV cold-resistant and tensile-strength cross-linked polyethylene insulated overhead cable according to claim 3, characterized in that, Each of the load-bearing positioning rings (5) is coaxially provided with an arc-shaped ring groove (13), which is used to accommodate a special hook for the suspension line.

Images