CN218939312U - 1.8/3kV rat and termite prevention power cable for wind energy - Google Patents

Abstract

The utility model discloses a 1.8/3kV rat and termite resistant power cable for wind energy, which comprises a cable core, an insulating layer, a water-blocking isolation layer, a shielding layer, an inner sheath layer, an armor protection layer, a buffer layer and an outer sheath layer, wherein the cable core is formed by twisting a plurality of conductors, the conductors are oxygen-free copper conductors, the insulating layer is extruded outside the cable core, and the water-blocking isolation layer, the shielding layer, the inner sheath layer, the armor protection layer, the buffer layer and the outer sheath layer are sequentially coated outside the insulating layer from inside to outside. The power cable disclosed by the utility model has the advantages that the weight of the cable can be reduced, the bending curvature of the cable can be improved, the flexibility of the cable is greatly improved, the whole tensile strength of the cable is enhanced through the armor protection layer made of the nonmagnetic aluminum tape, the flame-retardant and fire-resistant grade of the cable is greatly improved, the comprehensive performance is superior, the whole structure is simple, the safety and reliability are realized, the performance is stable, and the practicability is strong, and the power cable is suitable for popularization and application.

Description

1.8/3kV rat and termite prevention power cable for wind energy

Technical Field

The utility model relates to the technical field of power cables, in particular to a 1.8/3kV rat and termite resistant power cable for wind energy.

Background

Along with the high-speed development of national economy, the application of the control cable is more and more extensive, and the control cable is suitable for industrial and mining enterprises, energy transportation departments, control circuits for alternating current rated voltage below 450/750V and other occasions. Such cables have high performance requirements and complex structures, and the cables are subject to not only dead weight, but also tensile forces from the equipment used in use. Particularly, the cable for the wind generating set is broken down due to the fact that burrs exist on the edge of the copper strip in the existing copper strip wrapping process, insulation is easy to puncture, and the cable breaks down in the using process due to the fact that moisture possibly wets between insulation and shielding due to an air gap. Secondly, the wind power station is built in a remote area of a mountain area, the cable can be bitten by mice and termites in use, and the bitten cable has the hidden quality hazards of short circuit and open circuit, so that the safety of the whole system is affected.

Because the current carrying capacity of the cable is generally related to the sectional area of the conductor core, the temperature of the conductor can be increased when the current is increased, and the insulating layer outside the conductor can be changed in performance when the temperature of the insulating layer exceeds the upper limit, so that the insulating reliability of the insulating layer is greatly reduced, the service life of the cable is influenced, meanwhile, the cable is more and more seriously damaged by mice and ants, serious consequences can be caused, and huge losses are caused to lives and properties of people. The traditional cable cannot avoid damage of mice and termites, even if the cable with the functions of preventing mice and termites appears in the market, the cable is generally added with toxic pesticides, and the cable can achieve a certain effect of preventing mice and termites, but can bring certain pollution to the environment at the same time, so that the cable is unfavorable for environmental protection.

Through searching, chinese patent grant publication No. (CN 205810403U) discloses an aluminum alloy rubber jacketed cable for a wind generating set with rated voltage of 1.8/3kV or below, which comprises a cable conductor, an insulating layer and a jacket. The cable conductor is formed by stranding at least two single wires, the single wires are made of AA-8030 series aluminum alloy, the tensile strength of any single wire is between 98 and 159MPa, and the elongation at break is not less than 10%. The aluminum alloy rubber jacketed cable can ensure the conductivity, bending performance, creep resistance, corrosion resistance and the like of the cable, can ensure that the cable keeps stable continuous performance when overload and overheat for a long time, and can ensure the tensile strength and toughness of the aluminum alloy cable conductor when the aluminum alloy cable conductor is used for replacing the copper cable conductor. In addition, as disclosed in chinese patent (application publication No. CN108878016 a), a low-temperature flexible cable special for wind power generation with rated voltage of 1.8-3kV and below is disclosed, which comprises a cable core, the cable core comprises a plurality of tin-plated copper conductors twisted with each other, and a thermoplastic polyurethane elastomer insulating layer extruded outside the tin-plated copper conductors, the exterior of the cable core is extruded with a composite wrapping tape, the exterior of the composite wrapping tape is extruded with a chlorinated polyethylene rubber buffer layer, the exterior of the chlorinated polyethylene rubber buffer layer is extruded with a silicone rubber tensile layer, the exterior of the silicone rubber tensile layer is provided with a metal armor shielding layer, the exterior of the metal armor shielding layer is extruded with a chlorinated polyethylene rubber sheath, and the chlorinated polyethylene rubber, the silicone rubber, the high-carbon galvanized steel wire and the thermoplastic polyurethane elastomer are utilized as component parts of the cable, so that the cable has certain tensile property and good low-temperature resistance.

From the disclosure of the above patent documents, there is provided a power cable satisfying the use requirement from different angles, respectively, in which the cable itself is subjected to a part of gravity, and after a long period of use, tensile deformation is easily generated, thereby affecting the electrical performance thereof. Therefore, in order to enhance the competitiveness of enterprises, the market share is increased, thereby providing a power cable different from the prior art so as to satisfy the use.

Disclosure of Invention

The utility model aims to solve the technical problems in the background technology, and provides a power cable which can meet the use requirements, thereby improving the safety performance and the service life of the power cable, in particular to a 1.8/3kV rat and termite resistant power cable for wind energy.

In order to solve the technical problems, the utility model adopts the following technical scheme: the utility model provides a 1.8/3kV protection against rodents ant power cable for wind energy, includes cable core, insulating layer, isolation layer that blocks water, shielding layer, inner sheath layer, armor protective layer, buffer layer and oversheath layer, the cable core is made by the transposition of many conductors, the type conductor is oxygen-free copper conductor the cable core is outer crowded to be wrapped with the insulating layer outside the insulating layer from interior to exterior cladding has isolation layer, shielding layer, inner sheath layer, armor protective layer, buffer layer and oversheath layer that blocks water in proper order.

Furthermore, the 1.8/3kV rat and termite resistant power cable for wind energy is formed by extruding and packaging crosslinked polyethylene insulating materials.

Furthermore, the 1.8/3kV rat and termite prevention power cable for wind energy is formed by wrapping a semiconductor water-blocking isolation layer in an overlapping wrapping mode, and the wrapping coverage rate of each layer is more than or equal to 20%.

Furthermore, the 1.8/3kV rat and termite resistant power cable for wind energy provided by the utility model is characterized in that the shielding layer is woven by annealed copper wires with the diameter of 0.1-0.3 mm to form a copper mesh belt structure, and the weaving density is not less than 80%.

Further, the 1.8/3kV rat and termite resistant power cable for wind energy is formed by extruding polyethylene sheath materials into an inner sheath layer.

Furthermore, the 1.8/3kV rat and termite resistant power cable for wind energy is formed by wrapping the armor protection layer by adopting a non-magnetic aluminum tape in an overlapping wrapping mode, and the wrapping coverage rate of each layer is more than or equal to 20%.

Furthermore, the 1.8/3kV rat and termite resistant power cable for wind energy is formed by wrapping a longitudinal wrapping aluminum-plastic composite belt in an overlapping wrapping mode, and the wrapping coverage rate of each layer is more than or equal to 20%.

Further, the 1.8/3kV rat and termite resistant power cable for wind energy is characterized in that the outer sheath layer is formed by extruding a rat and termite resistant PE polyethylene sheath material.

The 1.8/3kV rat and termite resistant power cable for wind energy is reasonable in overall structure, the cable core is made of high-quality oxygen-free copper conductors, good conductivity of the cable is guaranteed, the insulating layer is made of cross-linked polyethylene with excellent performance, the cable is guaranteed to have excellent insulating performance, the water-blocking isolation layer is made of semi-conductive water-blocking tapes in a wrapping mode, the cable can play a role in longitudinal water blocking, the insulating layer can be protected, the insulating layer is prevented from being damaged by burrs caused by copper tape shielding, the shielding layer is made of copper mesh tape structures, the electric field is guaranteed to be uniformly distributed in the radial direction, the cable core in the shielding body can be effectively protected from being interfered by external strong electric fields, a certain electric leakage protection effect can be achieved, the inner sheath layer is made of polyethylene sheath materials in an extrusion mode, the insulating layer is prevented from being affected by damp, mechanical damage and light and chemical erosion mediums and the like, the armor layer is made of non-magnetic aluminum tape in a wrapping mode, the tensile strength of the cable can be effectively improved, the buffer layer is made of longitudinal aluminum plastic composite tape in a wrapping mode, the outer sheath layer can be effectively prevented from cracking, the outer sheath layer is prevented from being extruded by polyethylene sheath materials, the rat and termite resistant protection is prevented from being better, the rat and termite resistant protection is achieved, and the rat and termite resistant protection is prevented.

Therefore, the power cable can reduce the weight of the cable, improve the bending curvature of the cable, greatly increase the flexibility of the cable, strengthen the whole tensile strength of the cable through the armor protection layer made of the nonmagnetic aluminum tape, greatly improve the flame retardant and fire resistant grade of the cable, and has the advantages of superior comprehensive performance, simple whole structure, safety, reliability, stable performance and strong practicability, thereby being suitable for popularization and application.

Drawings

The utility model is described in further detail below with reference to the accompanying drawings.

FIG. 1 is a schematic diagram of the structure of the present utility model;

fig. 2 is a schematic cross-sectional view of the armor protective layer according to the present utility model.

The figure shows: 1-cable core, 2-insulating layer, 3-isolation layer that blocks water, 4-shielding layer, 5-inner sheath layer, 6-armor protective layer, 7-buffer layer, 8-oversheath layer.

Detailed Description

As shown in fig. 1 and 2, the 1.8/3kV rat and termite resistant power cable for wind energy comprises a cable core 1, an insulating layer 2, a water-blocking isolation layer 3, a shielding layer 4, an inner sheath layer 5, an armor protection layer 6, a buffer layer 7 and an outer sheath layer 8, wherein the cable core 1 is formed by twisting a plurality of conductors, the conductors are oxygen-free copper conductors, the insulating layer 2 is extruded outside the cable core 1, and the water-blocking isolation layer 3, the shielding layer 4, the inner sheath layer 5, the armor protection layer 6, the buffer layer 7 and the outer sheath layer 8 are sequentially coated outside the insulating layer 2 from inside to outside; the insulating layer 2 is formed by extrusion of crosslinked polyethylene insulating materials, the water-blocking isolation layer 3 is formed by wrapping a semi-conductive water-resistant tape in an overlapping wrapping mode, the wrapping coverage rate of each layer is more than or equal to 20%, the shielding layer 4 is a copper mesh belt structure formed by braiding annealed copper wires with the diameter of 0.1-0.3 mm, the braiding density of the shielding layer is not less than 80%, the inner sheath layer 5 is formed by extrusion of polyethylene sheath materials, the armor protection layer 6 is formed by wrapping a non-magnetic aluminum tape in an overlapping wrapping mode, the wrapping coverage rate of each layer is more than or equal to 20%, the buffer layer 7 is formed by wrapping a longitudinal wrapping aluminum-plastic composite tape in an overlapping wrapping mode, the wrapping coverage rate of each layer is more than or equal to 20%, and the outer sheath layer 8 is formed by extrusion of rat-proof PE polyethylene sheath materials.

Because the existing copper strip wrapping procedure, such as burrs are formed on the edge of the copper strip, the insulation layer is easy to puncture to cause breakdown, and because of an air gap between the insulation layer and the shielding layer, the cable is likely to break down in the use process because of moisture. The cable core 1 is formed by twisting a plurality of conductors, the conductors are oxygen-free copper conductors, the conductors are twisted, the twisting mode is that the middle is a round conductor, the outer layer is a trapezoid conductor, the cable core can be quite round during twisting, compression operation is not needed, the twisting is compact, the filling coefficient can reach 95%, the outer diameter of the cable core is smaller than that of the compression type cable core under the condition of the same current carrying capacity, and insulating materials can be saved; meanwhile, as no compression is needed, direct twisting is adopted, the phenomenon of burrs does not exist, the breakdown problem of a withstand voltage test cannot occur due to the burrs of the conductor, and therefore the safety of a power transmission line can be improved, the problem of compression broken wire cannot occur in the direct twisting process, and the problem of waste caused by failure in repairing cannot occur.

The insulating layer 2 is insulated by crosslinked polyethylene with excellent performance, the crosslinked polyethylene can be used for a long time at 90 ℃, and the highest heat-resistant temperature during short circuit can reach 250 ℃; the insulation resistance is high, the dielectric loss tangent is small, and the dielectric loss tangent basically does not change along with the change of temperature; has good wear resistance and environmental stress cracking resistance. The crosslinked polyethylene produces carbon dioxide and water upon cable burn. The existing PVC insulated cable generates hydrogen chloride harmful gas during combustion; in addition, the density of the crosslinked polyethylene is about 40 percent less than that of PVC, and the quality of the product can be obviously reduced. Therefore, the crosslinked polyethylene is used as the insulating layer 2, so that the insulating layer has strong acid-base resistance and oil resistance, combustion products of the insulating layer are mainly water and carbon dioxide, the harm to the environment is small, and the requirements of modern fire safety are met.

The water-blocking isolation layer 3 is formed by wrapping a semi-conductive water-blocking tape, the semi-conductive water-blocking tape is formed by dipping and drying the water-blocking tape through semi-conductive glue, and the fiber is fully carded, so that the longitudinal strength is high and the resistance is small. The semiconductive water-blocking tape is adopted as the water-blocking isolation layer 3, so that the longitudinal water-blocking effect can be achieved, the insulating layer can be protected, and the insulating layer is prevented from being damaged due to burrs of the copper tape shielding.

The shielding layer 4 adopts a copper mesh belt structure, ensures that an electric field is uniformly distributed in the radial direction, can effectively protect a cable core in the shielding body from being interfered by an external strong electric field, and can also play a certain role in leakage protection.

The inner sheath layer 5 is formed by extruding polyethylene sheath material, and is coated on the shielding layer 4 to form a protective cover layer for preventing the insulating layer from being affected by moisture, mechanical damage, light and chemical aggressive media and the like.

The armor protection layer 6 is formed by wrapping a non-magnetic aluminum belt, and the structure of the armor protection layer 6 is shown in fig. 2, so that the cable can be protected from being gnawed by mice and termites and from being damaged by external mechanical force, the cable conductor and insulation can be protected, and the tensile strength of the cable can be effectively improved when the cable is possibly damaged by external force or needs to bear the dead weight of a large span.

The buffer layer 7 is formed by longitudinally wrapping an aluminum-plastic composite belt, the aluminum-plastic composite belt is composed of an aluminum belt and ethylene copolymers attached to two sides of the aluminum belt, the influence of the armor protection layer 6 on the outer sheath layer 8 can be avoided, the buffer effect can be achieved by longitudinally wrapping the aluminum-plastic composite belt, the flatness of the armor protection layer 6 is improved, the thickness of the outer sheath layer 8 is uniform, and the cracking phenomenon of the outer sheath layer 8 can be effectively prevented.

Because the cable can be bitten by mice and termites in use, the bitten cable has the hidden quality hazards of short circuit and open circuit, and the safety of the whole system is affected. Therefore, the outer sheath layer 8 is formed by extruding and wrapping the rat and termite resistant PE polyethylene sheath material, and the rat and termite resistant PE polyethylene sheath material is odorless, nontoxic, excellent in low temperature resistance, good in chemical stability, resistant to most of acid and alkali corrosion, small in water absorption and excellent in electrical insulation. The PE polyethylene sheath material for preventing mice and ants is a relatively common material in cables, is added with a repellent, takes capsaicin as a basic component for preventing mice and ants, takes silicon dioxide as a carrier, can prolong the effective action time of the capsaicin, and expands the application range of the capsaicin. The outer sheath layer 8 formed by extruding and wrapping the rat and termite resistant PE polyethylene sheath material not only plays a good role in protection, but also plays a role in preventing rats and termites, and can improve the flame-retardant and fire-resistant grade of the cable.

In summary, the power cable disclosed by the utility model has the advantages that the weight of the cable can be reduced, the bending curvature of the cable can be improved, the flexibility of the cable is greatly improved, the overall tensile strength of the cable is enhanced through the armor protection layer 6 made of the nonmagnetic aluminum tape, the flame retardant and fire resistant grade of the cable is greatly improved, the comprehensive performance is superior, the overall structure is simple, the safety and reliability are realized, the performance is stable, the practicability is strong, and the power cable is suitable for popularization and application.

The protection scope of the present utility model is not limited to the technical solutions disclosed in the specific embodiments, but the above description is only a preferred embodiment of the present utility model, and is not limited to the present utility model, and any minor modifications, equivalent substitutions and improvements made according to the technical solutions of the present utility model should be included in the protection scope of the technical solutions of the present utility model.

Claims (8)

1. A1.8/3 kV rat and termite prevention power cable for wind energy is characterized in that: including cable core (1), insulating layer (2), isolation layer (3) that blocks water, shielding layer (4), inner sheath layer (5), armor protective layer (6), buffer layer (7) and oversheath layer (8), cable core (1) is made through the transposition by many conductors, the type conductor is oxygen-free copper conductor cable core (1) crowded package has insulating layer (2) outward insulating layer (2) is outside from interior to outside cladding in proper order has isolation layer (3), shielding layer (4), inner sheath layer (5), armor protective layer (6), buffer layer (7) and oversheath layer (8) that blocks water.

2. A 1.8/3kV rat and termite resistant power cable for wind energy according to claim 1, characterized in that: the insulating layer (2) is formed by extruding and packing crosslinked polyethylene insulating materials.

3. A 1.8/3kV rat and termite resistant power cable for wind energy according to claim 1, characterized in that: the water-blocking isolation layer (3) is formed by wrapping a semiconductor water-blocking tape in an overlapping wrapping mode, and the wrapping coverage rate of each layer is more than or equal to 20%.

4. A 1.8/3kV rat and termite resistant power cable for wind energy according to claim 1, characterized in that: the shielding layer (4) is of a copper mesh belt structure formed by weaving annealed copper wires with the diameter of 0.1-0.3 mm, and the weaving density is not less than 80%.

5. A 1.8/3kV rat and termite resistant power cable for wind energy according to claim 1, characterized in that: the inner sheath layer (5) is formed by extruding polyethylene sheath materials.

6. A 1.8/3kV rat and termite resistant power cable for wind energy according to claim 1, characterized in that: the armor protection layer (6) is formed by wrapping non-magnetic aluminum strips in an overlapping wrapping mode, and the wrapping coverage rate of each layer is more than or equal to 20%.

7. A 1.8/3kV rat and termite resistant power cable for wind energy according to claim 1, characterized in that: the buffer layer (7) is formed by wrapping a longitudinal wrapping aluminum-plastic composite belt in an overlapping wrapping mode, and the wrapping coverage rate of each layer is more than or equal to 20%.

8. A 1.8/3kV rat and termite resistant power cable for wind energy according to claim 1, characterized in that: the outer sheath layer (8) is formed by extruding and packing a rat and termite resistant PE polyethylene sheath material.

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