CN219958608U - Capacity-increasing heat-resistant power cable - Google Patents
Capacity-increasing heat-resistant power cable Download PDFInfo
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- CN219958608U CN219958608U CN202321365888.XU CN202321365888U CN219958608U CN 219958608 U CN219958608 U CN 219958608U CN 202321365888 U CN202321365888 U CN 202321365888U CN 219958608 U CN219958608 U CN 219958608U
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- heat
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- shielding layer
- resistant
- power cable
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- 239000004020 conductor Substances 0.000 claims abstract description 31
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910052802 copper Inorganic materials 0.000 claims abstract description 11
- 239000010949 copper Substances 0.000 claims abstract description 11
- -1 polyethylene Polymers 0.000 claims abstract description 11
- 229920003020 cross-linked polyethylene Polymers 0.000 claims abstract description 8
- 239000004703 cross-linked polyethylene Substances 0.000 claims abstract description 8
- 239000004745 nonwoven fabric Substances 0.000 claims abstract description 8
- 239000004698 Polyethylene Substances 0.000 claims abstract description 4
- 229920000573 polyethylene Polymers 0.000 claims abstract description 4
- 239000010410 layer Substances 0.000 claims description 49
- 229910052782 aluminium Inorganic materials 0.000 claims description 18
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 18
- 239000002131 composite material Substances 0.000 claims description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 7
- 229910002804 graphite Inorganic materials 0.000 claims description 7
- 239000010439 graphite Substances 0.000 claims description 7
- 239000012790 adhesive layer Substances 0.000 claims description 6
- 238000009954 braiding Methods 0.000 claims description 6
- 229920003023 plastic Polymers 0.000 claims description 6
- 239000004033 plastic Substances 0.000 claims description 6
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 6
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 6
- 230000001681 protective effect Effects 0.000 claims description 5
- 239000004743 Polypropylene Substances 0.000 claims description 4
- 230000017525 heat dissipation Effects 0.000 claims description 4
- 239000000314 lubricant Substances 0.000 claims description 4
- 229920001155 polypropylene Polymers 0.000 claims description 4
- 229920000742 Cotton Polymers 0.000 claims description 3
- 238000013329 compounding Methods 0.000 claims description 3
- 239000011247 coating layer Substances 0.000 claims description 2
- 238000009413 insulation Methods 0.000 abstract description 10
- 239000000463 material Substances 0.000 abstract description 9
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- 208000028659 discharge Diseases 0.000 description 4
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- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 230000006750 UV protection Effects 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 239000003513 alkali Substances 0.000 description 3
- 238000000137 annealing Methods 0.000 description 2
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- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
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- Insulated Conductors (AREA)
Abstract
The utility model discloses a capacity-increasing heat-resistant power cable, which comprises: the molded line conductor is coated with an inner shielding layer outside the molded line conductor, a heat-resistant crosslinked polyethylene insulating layer is extruded outside the inner shielding layer, and an outer shielding layer is coated outside the heat-resistant crosslinked polyethylene insulating layer; the copper strip shielding layer is wrapped outside the outer shielding layer, the heat-resistant non-woven fabric belt is wrapped outside the copper strip shielding layer, and the ultra-high molecular polyethylene outer sheath is extruded outside the heat-resistant non-woven fabric belt. The utility model takes conductor selection and structure and the temperature resistance of the insulating and shielding materials of the power cable as starting points, so that the cable can bear higher working temperature, long-term heat resistance and highest running temperature, the reliability of safe running of the cable is ensured, thermal aging and electrical aging insulation faults do not occur, and dynamic capacity expansion is realized according to the real-time environment condition of the running of the cable.
Description
Technical Field
The utility model relates to the technical field of power cables, in particular to a capacity-increasing heat-resisting power cable.
Background
With the rapid development of national economy, the power demand of China is increased in multiple stages in recent years, and the load born by urban distribution networks is increased year by year. Due to the increasing shortage of line corridor resources and the increasing of corridor floor space pressure, it is more and more difficult to newly build a power transmission line in a city, and the load channel is often subjected to the limitation influence of the power transmission line corridor and the like, so that the phenomenon of neck clamping is often caused. So that the load cannot be effectively transmitted to the receiving end. In order to solve the contradiction between the increasing power load and the difficulty in cable line construction, the research direction can only be transferred from the expansion of the power grid to the potential of excavating the existing line, and the conveying capacity of the existing line is improved to meet the requirement of electric charge.
The current problem of improving the transmission capacity is that from two methods of improving the transmission voltage and the transmission current, under the condition of not changing the transmission voltage of the existing line, the allowable current carrying capacity of the improved wire becomes the main direction of increasing the stable transmission capacity of the line and improving the normal transmission capacity of the line, so that in order to meet the high-load requirement of the power cable, breakthrough is needed to be realized from the carrier conductor for transmitting the current, and the improvement performance is taken as a starting point from the conductor material, the structure and the insulation, the shielding material and the tolerance temperature of the power cable, so that the power cable can bear higher working temperature, long-term heat resistance and the highest working temperature, the reliability of safe operation of the power cable is ensured, and thermal aging and electrical aging insulation faults do not occur, thereby realizing dynamic capacity increase according to the real-time environment condition of the operation of the cable; in addition, the allowable temperature of the lead wire regulated by the current standard is increased, the transmission capacity of the built circuit is increased, the safety margin of the circuit operation is improved, the investment of a newly built circuit is reduced, the occupied pressure of the urban power transmission circuit is reduced, and the method has practical economic significance.
Disclosure of Invention
In order to solve the problems in the prior art, the utility model provides a capacity-increasing heat-resistant power cable, which takes the conductor material selection and structure and the temperature resistance of the power cable insulation and shielding material as starting points to improve the performance, so that the cable can bear higher working temperature, long-term heat resistance and the highest running temperature, the reliability of safe running of the cable is ensured, and insulation faults of thermal aging and electrical aging are avoided, thereby realizing dynamic capacity increase according to the real-time environment condition of the running of the cable.
The technical scheme adopted for solving the technical problems is as follows: a compatibilized, heat resistant power cable comprising: the molded line conductor is coated with an inner shielding layer outside the molded line conductor, a heat-resistant crosslinked polyethylene insulating layer is extruded outside the inner shielding layer, and an outer shielding layer is coated outside the heat-resistant crosslinked polyethylene insulating layer; the copper strip shielding layer is wrapped outside the outer shielding layer, the heat-resistant non-woven fabric belt is wrapped outside the copper strip shielding layer, and the ultra-high molecular polyethylene outer sheath is extruded outside the heat-resistant non-woven fabric belt.
Further improved, the inner shielding layer is a shielding type aluminum-plastic composite belt.
Further improved, the shielding type aluminum-plastic composite belt comprises an aluminum wire weaving layer, wherein one side of the aluminum wire weaving layer is bonded with high-temperature-resistant heat-insulating cotton through an inorganic high-temperature adhesive layer, and the other side of the aluminum wire weaving layer is bonded with a polytetrafluoroethylene PTFE film through the inorganic high-temperature adhesive layer.
Further improved, the aluminum wire braiding layer is formed by braiding a plurality of aluminum wires serving as warp wires and a plurality of aluminum wires serving as weft wires.
Further improved, the outer shielding layer is a heat conduction and radiation shielding composite film.
Further improved, the heat-conducting heat-dissipating shielding composite film is formed by compounding a polypropylene protective film, an electromagnetic shielding coating layer, a heat-conducting graphite film layer and a PET release film from top to bottom.
Further improved, the molded line conductor is formed by layering, twisting, compacting and forming a plurality of trapezoidal monofilaments, and lubricant is filled among the plurality of trapezoidal monofilaments, so that a layer of film which can bear the pressure in a stretching die hole and is not damaged is formed between the plurality of trapezoidal monofilaments, the friction coefficient is reduced, and the smooth surface, the regular shape and the accurate size of the trapezoidal molded line are ensured.
Compared with the prior art, the utility model has the beneficial effects that:
the trapezoidal molded lines are compressed in a layered manner, so that the arrangement and twisting are tighter, the outer diameter of the whole conductor is greatly reduced, and the problem that gaps exist in the conventional compression of round monofilaments is solved; the conductor structure is more compact and stable, the contact surface between monofilaments is large, the contact resistance is reduced, the conductivity is better, the sectional area of the conductor can be effectively increased, and the interception rate of the cable is increased; the surface of the outer layer of the conductor is more compact, smooth, round and free of protrusions, and the surface charge and the field intensity are uniformly distributed when the conductor is electrified, so that the tip discharge risk of the surface of the conductor is reduced;
the contact surface among molded lines and monofilaments is large, the eddy current loss is small, the conductor surface is smooth, the gap is small, the electric field is balanced, the product quality is more stable, and the service life is longer;
the advantages of the trapezoid molded line monofilament stranded conductor are remarkably represented in the production of a high-voltage power cable, the molded line conductor has smooth surface, no burrs and small gaps, the problems of unbalanced electric field on the surface of the conductor and tip discharge caused by burrs in the production of the power cable are well solved, the partial discharge test discharge capacity is obviously reduced, and the product qualification rate is obviously improved; in terms of product cost, the compression coefficient of the conductor twisted by the trapezoid-shaped molded line monofilaments is increased, the outer diameter of the conductor is greatly reduced compared with that of the conductor twisted by the round monofilaments, the use of subsequent procedures such as insulation, cabling, armor and outer protection materials can be saved, and compared with the traditional product structure, the material is reduced by 1-2% on average.
The lubricant is filled among the trapezoid monofilaments, so that a layer of film which can bear the pressure in the stretching die hole and is not damaged is formed between the trapezoid monofilaments, the friction coefficient is reduced, and the smooth surface, the regular shape and the accurate size of the trapezoid lines are ensured.
The heat conduction, heat dissipation and shielding composite film is adopted, the high heat conduction of the heat conduction graphite film and the electromagnetic shielding performance of the electromagnetic shielding coating are combined, heat in the cable can be quickly converted and dissipated, and meanwhile, the interference of electromagnetic waves radiated outwards by the cable and external electromagnetic waves on equipment is also shielded; the production and processing technology is simple and mature, the electromagnetic shielding coating can be directly sprayed on the heat-conducting graphite film by a conventional spraying technology, and the other protective film and the release film are also conventional laminating and film-covering technologies, so that the processing cost is low and the energy consumption is low; the product is convenient and quick to use, and the PET release film is directly torn off and applied on the cable, so that the product is convenient and quick.
The shielding aluminum-plastic composite belt is adopted, so that acid and alkali resistance, corrosion resistance, high temperature resistance and ultraviolet resistance of the cable are further improved greatly, the use amount of metal is reduced greatly compared with the prior copper product, the weight of the cable is reduced, and the cost is reduced.
In summary, by taking the conductor selection and structure and the insulation and shielding material tolerance temperature consideration of the power cable as starting points, the performance of the cable is improved, so that the cable can bear higher working temperature, long-term heat resistance and the highest running temperature, the reliability of safe running of the cable is ensured, thermal aging and insulation faults of electrical aging are avoided, and dynamic capacity expansion is realized according to the real-time environment condition of the running of the cable.
Drawings
FIG. 1 is a schematic diagram of the structure of the present utility model;
FIG. 2 is a schematic side cross-sectional view of a preferred embodiment of the present utility model;
FIG. 3 is a schematic view of the structure of a resistance-reinforced pipe according to a preferred embodiment of the present utility model.
Description of the embodiments
The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings.
As shown in fig. 1, the present utility model provides a heat and capacity-increasing type power cable, comprising: the molded line conductor 1 mainly adopts a copper rod with better copper resistivity performance, the size of each layer of trapezoidal monofilament is accurately designed according to the size of the section of the conductor, the trapezoidal molded line monofilament is drawn by a customized special polycrystalline wire drawing die, then the trapezoidal molded line monofilament is layered, arranged, stranded and pressed on a stranding machine for forming, and in the process of drawing the molded line monofilament, the surfaces of the stretching metal and the die holes are lubricated by a high-quality lubricant, so that a layer of film which can bear the pressure in the stretching die holes and is not damaged is formed between the stretching metal and the die holes, the friction coefficient is reduced, and the smooth surface, the regular shape and the accurate size of the trapezoidal molded line are ensured; meanwhile, the annealing current is mastered in the annealing process, the trapezoidal molded lines are uniformly tensioned by adopting a variable-frequency speed regulation control speed ratio, and molded line monofilaments drawn by a polycrystalline wire drawing die are regular in structure and smooth in surface, so that smooth and round surface of molded line conductors pressed out in a layering manner is ensured, and a stress relieving device is additionally arranged in the twisting process, and meanwhile, a forming pre-twisting device is matched, so that the problem of turning over caused by scratch risks and stress of the monofilaments in the twisting process is solved;
an inner shielding layer 2 is coated outside the molded line conductor, a heat-resistant crosslinked polyethylene insulating layer 3 is extruded outside the inner shielding layer 2, and an outer shielding layer 4 is coated outside the heat-resistant crosslinked polyethylene insulating layer 3; the copper strip shielding layer 5 is wrapped outside the outer shielding layer 4, the heat-resistant non-woven fabric belt 6 is wrapped outside the copper strip shielding layer 5, and the ultra-high molecular polyethylene outer sheath 7 is extruded outside the heat-resistant non-woven fabric belt 6, so that the cable has the advantages of super wear resistance, self-lubricity, high strength, high ageing resistance, impact resistance, corrosion resistance, light resistance and the like, and the service life of the cable is greatly prolonged.
As shown in fig. 2, the inner shielding layer 2 is a shielding type aluminum-plastic composite belt and comprises an aluminum wire weaving layer 21, wherein the aluminum wire weaving layer 21 is formed by weaving a plurality of aluminum wires serving as warp yarns and a plurality of aluminum wires serving as weft yarns; the high-temperature resistant heat insulation cotton 22 is adhered to one side of the aluminum wire weaving layer 21 through an inorganic high-temperature adhesive layer, the heat conductivity of the gas is small, the gas cannot burn, the gas is incombustible, deformation and embrittlement are avoided, the high-temperature resistance can reach 700 ℃, and the combustion performance reaches A1 level after detection; no odor exists, the environment is protected, the toxicity is avoided, and the corrosion resistance is high; the other side is adhered with a polytetrafluoroethylene PTFE film 24 through an inorganic high-temperature adhesive layer 23, and has acid and alkali resistance, corrosion resistance, high temperature resistance and ultraviolet resistance; the acid and alkali resistance, corrosion resistance, high temperature resistance, flame retardance and ultraviolet resistance of the cable are further greatly improved, and compared with the prior product, the metal consumption is greatly reduced, and the cost is reduced.
As shown in fig. 3, the outer shielding layer 4 is a heat-conducting heat-dissipating shielding composite film, which is formed by compounding a polypropylene protective film 41, an electromagnetic shielding paint layer 42, a heat-conducting graphite film layer 43 and a PET release film 44 in sequence from top to bottom; the heat conduction, heat dissipation and shielding composite film is adopted, the high heat conduction of the heat conduction graphite film and the electromagnetic shielding performance of the electromagnetic shielding coating are combined, heat in the cable can be quickly converted and dissipated, and meanwhile, the interference of electromagnetic waves radiated outwards by the cable and external electromagnetic waves on equipment is also shielded; the production and processing technology is simple and mature, the electromagnetic shielding coating can be directly sprayed on the heat-conducting graphite film by a conventional spraying technology, and the other polypropylene protective film and the release film are also conventional laminating and film-covering technologies, so that the processing cost is low and the energy consumption is low; the product is convenient and quick to use, and the PET release film is directly torn off and applied to the cable, so that the cable is convenient and quick, and has the advantages of heat conduction, heat dissipation, high temperature resistance and good shielding property.
In summary, through the improvement, the cable has the advantages of super wear resistance, self-lubricating property, high strength, strong ageing resistance, impact resistance, corrosion resistance, light resistance and the like, and the interception rate of the cable is increased, so that the service life of the cable is greatly prolonged; the utility model takes conductor selection and structure and the temperature resistance of the insulating and shielding materials of the power cable as starting points, so that the cable can bear higher working temperature, long-term heat resistance and highest running temperature, the reliability of safe running of the cable is ensured, thermal aging and electrical aging insulation faults do not occur, and dynamic capacity expansion is realized according to the real-time environment condition of the running of the cable.
It should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.
Claims (7)
1. A compatibilized heat resistant power cable, characterized in that: comprising the following steps: the molded line conductor is coated with an inner shielding layer outside the molded line conductor, a heat-resistant crosslinked polyethylene insulating layer is extruded outside the inner shielding layer, and an outer shielding layer is coated outside the heat-resistant crosslinked polyethylene insulating layer; the copper strip shielding layer is wrapped outside the outer shielding layer, the heat-resistant non-woven fabric belt is wrapped outside the copper strip shielding layer, and the ultra-high molecular polyethylene outer sheath is extruded outside the heat-resistant non-woven fabric belt.
2. The compatibilized heat resistant power cable of claim 1, wherein the inner shielding layer is a shielding aluminum plastic composite tape.
3. The capacity-increasing heat-resistant power cable according to claim 2, wherein the shielding type aluminum-plastic composite tape comprises an aluminum wire braiding layer, wherein one side of the aluminum wire braiding layer is bonded with high-temperature-resistant heat-insulating cotton through an inorganic high-temperature adhesive layer, and the other side of the aluminum wire braiding layer is bonded with a polytetrafluoroethylene PTFE film through the inorganic high-temperature adhesive layer.
4. A heat and capacity increased type power cable according to claim 3, wherein said aluminum wire braid is formed by braiding a plurality of aluminum wires as warp yarns with a plurality of aluminum wires as weft yarns.
5. The heat and capacity increased type power cable according to claim 1, wherein the outer shielding layer is a heat conductive and heat dissipation shielding composite film.
6. The heat-tolerant and heat-tolerant power cable of claim 5, wherein the heat-conducting and heat-dissipating shielding composite film is formed by compounding a polypropylene protective film, an electromagnetic shielding coating layer, a heat-conducting graphite film layer and a PET release film in sequence from top to bottom.
7. A heat and capacity enhanced power cable as claimed in claim 1, wherein said molded wire conductor is formed by layering and twisting a plurality of trapezoidal filaments, and a lubricant is filled between the plurality of trapezoidal filaments.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321365888.XU CN219958608U (en) | 2023-05-31 | 2023-05-31 | Capacity-increasing heat-resistant power cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321365888.XU CN219958608U (en) | 2023-05-31 | 2023-05-31 | Capacity-increasing heat-resistant power cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219958608U true CN219958608U (en) | 2023-11-03 |
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ID=88546743
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321365888.XU Active CN219958608U (en) | 2023-05-31 | 2023-05-31 | Capacity-increasing heat-resistant power cable |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219958608U (en) |
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2023
- 2023-05-31 CN CN202321365888.XU patent/CN219958608U/en active Active
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