CN214796789U - Low-toxicity environment-friendly longitudinal waterproof medium-voltage power cable based on high polymer material - Google Patents
Low-toxicity environment-friendly longitudinal waterproof medium-voltage power cable based on high polymer material Download PDFInfo
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- CN214796789U CN214796789U CN202120991371.6U CN202120991371U CN214796789U CN 214796789 U CN214796789 U CN 214796789U CN 202120991371 U CN202120991371 U CN 202120991371U CN 214796789 U CN214796789 U CN 214796789U
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Abstract
The utility model provides a low toxicity environmental protection vertical waterproof middling pressure power cable based on macromolecular material which the structure is: the cable core is formed by sequentially wrapping a second wrapping layer, a third wrapping layer, a metal sheath layer, a high-molecular flame-retardant layer, a fourth wrapping layer and an outer sheath from inside to outside; the cable core comprises many sinle silks that block water and fire-retardant waterproof packing transposition, and the structure of single sinle silk that blocks water is: the waterproof cable comprises a waterproof conductor, a conductor shielding layer, an insulating shielding layer and a first wrapping layer from inside to outside in sequence. The cable has the characteristics of high flame retardance, water resistance, low toxicity and the like, and can be selectively used in the environment with higher requirements on flame retardance and environmental protection performance, such as source, building, rail transit, chemical engineering and the like.
Description
Technical Field
The utility model relates to a low toxicity environmental protection vertical waterproof medium voltage power cable based on macromolecular material is applicable to rated voltage 3.6/6kV to 26/35 kV's plastics class power cable, belongs to cable technical field.
Background
With the continuous development of science and technology and economy, on the basis of meeting the electrical performance, a new use scene puts higher requirements on the cable. Meanwhile, the development of new materials is also changing day by day, and how to apply the new materials to cables in special use scenes and ensure that the electrical property, the mechanical property, the safety performance, the environmental protection and the like of the cables meet the requirements is a technical difficulty to be solved at present.
Taking the application with waterproof environment as an example, although waterproof tests are added in the new national standards of power cables, the familiarity of industrial users for waterproof performance is still insufficient, and related production and test experiences are lacked. From the perspective of cable type selection and design, the requirement of passing a waterproof test examination is provided on the basis of meeting the electrical performance of the cable, and the filling performance of the cable, the waterproof performance and the low-toxicity performance and the thermal stability performance of a sheath are improved.
SUMMERY OF THE UTILITY MODEL
Technical problem to be solved
Cables need to meet the requirements of water resistance and low toxicity in a variety of use environments.
Technical scheme adopted for solving the technical problems
The utility model provides a low toxicity environmental protection vertical waterproof middling pressure power cable based on macromolecular material which the structure is:
the cable core is formed by sequentially wrapping a second wrapping layer 7, a third wrapping layer 8, a metal sheath layer 9, a high polymer flame-retardant layer 10, a fourth wrapping layer 11 and an outer sheath 12 from inside to outside;
the cable core is formed by twisting three water-blocking wire cores and flame-retardant waterproof filling 6, and the cabling pitch-diameter ratio range is 21-38 times;
the second wrapping layer 7 is formed by overlapping and wrapping a layer of double-sided insulating water-blocking tape, and the covering rate is not less than 25%;
the third wrapping layer 8 is formed by overlapping and wrapping a layer of environment-friendly low-smoke halogen-free flame-retardant tape, the average covering rate is not less than 15%, and the minimum covering rate is not less than 10%;
the metal sheath layer 9 is formed by wrapping a copper strip, and the thickness of the copper strip is 0.10-0.15 mm;
the high-molecular flame-retardant layer 10 is formed by extruding polyetherimide materials, the nominal thickness of the high-molecular flame-retardant layer is 2.0-4.5 mm, and the thickness of the thinnest point is not less than 80-0.2 mm of the nominal value;
the fourth wrapping layer 11 is formed by overlapping and wrapping a layer of semi-conductive water-blocking tape, the average covering rate is not less than 20%, and the minimum covering rate is not less than 15%;
the outer sheath 12 is formed by extruding and wrapping an environment-friendly thermoplastic polyurethane sheath material, the nominal thickness is not less than 2.5mm, and the thinnest point thickness is not less than 80-0.2 mm of the nominal value;
the structure of single sinle silk that blocks water does: the water-blocking cable comprises a longitudinal water-blocking conductor 1, a conductor shielding layer 2, an insulating layer 3, an insulating shielding layer 4 and a first wrapping layer 5 from inside to outside in sequence;
the water-blocking conductor is a round structure formed by twisting and pressing a second type of conductor, and is formed by twisting metal monofilaments; the metal monofilament is copper monofilament or aluminum monofilament; the metal monofilaments of the water-blocking conductor are divided into a plurality of layers from inside to outside, adjacent twisted layers are separated by a water-blocking tape, and the conductor is wrapped with a jointless semiconductive water-blocking tape in an overlapped mode;
the first lapping layer 5 is formed by lapping a layer of copper strips in an overlapping mode, the nominal value of the lapping rate is not less than 15%, and the minimum lapping rate is not less than 5%.
Further:
the insulating water-blocking tape between adjacent twisted layers is of a longitudinal wrapping structure, a single-sided insulating water-blocking tape with the nominal thickness of 0.2mm is longitudinally wrapped between 1+6 twisted layers, a double-sided insulating water-blocking tape with the nominal thickness of 0.2mm is longitudinally wrapped between 6+12 twisted layers and 12+18 twisted layers, a double-sided insulating water-blocking tape with the nominal thickness of 0.35mm is longitudinally wrapped between 18+24 twisted layers and 24+30 twisted layers, the water-blocking tapes are overlapped in a covering mode, and the condition of package leakage is not allowed to occur;
1 layer of jointless semiconductive water-blocking tape with nominal thickness of 0.3mm multiplied by 45mm is lapped outside the conductor in a right-hand lapping mode, the lapping rate is 45-50%, the minimum lapping width is not less than 5mm, and the lapping is smooth and compact without defects of damage and the like. The semiconductor water-blocking tape which is unsealed but not used in the production process is stored in a sealing mode in time, the semiconductor water-blocking tape is dried before being used, the drying temperature is 50-60 ℃, the drying time is not less than 24 hours, and meanwhile the dried semiconductor water-blocking tape is used up in 12 hours.
Production considerations:
(1) the method for jointing the semiconductive water-blocking tape comprises the following steps: two ends of the semi-conductive water-blocking tape are respectively cut into an angle of about 45 degrees, two sharp angles are overlapped and butted, the overlapping length is about (30-50) mm, the semi-conductive tape is wound by (1-2) circles to fix the joint of the semi-conductive water-blocking tape, the semi-conductive tape is not overlapped in a winding mode, and double-sided tape, semi-conductive glue, medical tape and the like are not used. The joints should be smooth and tight to avoid affecting the production of chemical delivery process.
(2) When the semi-conductive water-blocking belt is broken and needs manual winding and repairing, the front end of the winding is carried out according to a joint method; when the rear end is repaired, a blade is used for removing a circle of the wrapped semi-conductive water blocking tape (a copper conductor cannot be cut, burrs are avoided), the repaired semi-conductive water blocking tape is manually wrapped to a rear end removing position, no bag leakage occurs, the semi-conductive water blocking tape is fixed with the joint by winding (1-2) circles of the semi-conductive water blocking tape, and the semi-conductive tape cannot be overlapped in the wrapping process. The joints should be smooth and tight to avoid affecting the production of chemical delivery process. (3) And attention is paid to moisture prevention and damp prevention, dry gloves are worn when the belt is changed and the joint is made, and influence of factors such as sweat is avoided. (4) And the die from the wrapped semi-conductive water-blocking tape to the middle of the polyester tape wrapping bag must use a steel die, a nylon die is not required, and the phenomenon of friction heating and block accumulation of the semi-conductive water-blocking tape is avoided.
(3) A polyester belt with the nominal thickness of 0.10mm is lapped outside the semi-conductive water blocking belt in an overlapping mode, and the semi-conductive water blocking belt is detached before the insulated wire cores are extruded. After production, the conductor is coated by the self-adhesive film, and two sides of the conductor must be coated to prevent the conductor from being oxidized due to moisture absorption, and the conductor is properly placed and transported to avoid collision.
The sequence conversion requirement is as follows: and the conductor enters a chemical cross process within 72 hours after the production of the conductor is finished, so that the conductor is prevented from being oxidized due to water absorption of the semiconductive water-blocking tape. If the program is not timely processed, internal evaluation is needed to determine whether the program is changed. When the chemical delivery production is carried out, a specially-assigned person is required to check the unfavorable conditions of moisture absorption, flock accumulation and the like of the semi-conductive water-blocking tape outside the conductor, if the semi-conductive water-blocking tape absorbs moisture seriously and cannot be produced in a rotating way, the carbon black flock accumulation is treated in time, and the defects of core bamboo joints, concave and convex and the like caused by moisture absorption and accumulation of water-blocking powder are avoided.
The water-blocking conductor is formed by twisting bare copper monofilaments, and the diameter range of the bare copper monofilaments is 2.22-3.85 mm; the diameter range of the water-blocking conductor is 6.1 mm-37.8 mm; the stranding direction of the bare copper monofilament is the left direction;
or the water-blocking conductor is formed by twisting bare aluminum monofilaments, and the diameter range of the bare aluminum monofilaments is 2.16-4.70 mm; the diameter range of the water-blocking conductor is 6.0 mm-37.8 m; the twisting direction of the bare aluminum monofilament is the left direction.
The cabling pitch-diameter ratio of the cable core is 21-27 times, and the nominal sectional area of the conductor is not more than 35mm2The aluminum conductor of (1); or the cabling pitch-diameter ratio of the cable core is 28-38 times, the conductor is a copper conductor, or the nominal sectional area of the conductor is more than 35mm2The aluminum conductor of (1).
The flame-retardant waterproof filler 6 is composed of a modified polypropylene closed cell foam strip (MPP). In the prior art, the polypropylene closed-cell foam strip material is prepared by adopting a supercritical carbon dioxide technology, carbon dioxide gas is introduced into a polypropylene material matrix at high temperature and high pressure, and the polypropylene material is induced to nucleate and foam to form a microporous foam material containing a large number of micron-scale blast holes, and the microporous foam material can naturally adapt to water absorption expansion after being modified and has high strength.
The conductor shielding layer 2 and the insulation shielding layer 4 are formed by extruding and coating an environment-friendly peroxide cross-linking type semi-conductive shielding material (for example, HFDA-0587BK or HFDA-0693BK in model/brand); the thickness range of the conductor shielding layer 2 is 0.50-1.10 mm; the thickness range of the insulation shielding layer 4 is 0.60-1.10 mm;
the insulating layer 3 is formed by extruding cross-linked polyethylene environment-friendly insulating materials (such as HFDB-4202EC or HFDC-4202EC with the model/brand), and the thickness range of the insulating layer is 3.2-10.5 mm.
The nominal thickness of the copper strip of the first lapping layer is 0.10 mm;
the nominal thickness of the double-sided insulating water-blocking tape of the second wrapping layer is 0.35 mm;
the nominal thickness of the environment-friendly low-smoke halogen-free flame-retardant belt of the third wrapping layer is 0.20 mm;
the nominal thickness of the semi-conductive water-blocking tape of the fourth wrapping layer is 0.25 mm;
the nominal thickness of the outer sheath is 2.5mm to 5.5 mm.
The metal sheath layer 9 is of a copper strip longitudinal wrapping structure, and the seam of the copper strip is of an (argon arc) welding structure.
The waterproof filling material adopts a polypropylene closed cell foam strip Material (MPP), and compared with the traditional filling material, the waterproof filling material has the following structural performance advantages:
the cable core cabling adopts waterproof filling material for filling, the filling is compact and round, the waterproof filling material is a polypropylene closed-cell foam strip, and the waterproof filling material can be tightly filled in the middle of a cable core in the cabling process, so that gaps are eliminated, and the effects of improving the cable roundness and increasing the strength are achieved. The polypropylene is a nontoxic material in nature, the clean and sanitary MPP is particularly suitable for the field with higher requirement on the sanitary grade, and can replace cross-linked PE foam, EVA foam and the like manufactured by an AC foaming agent. The polypropylene closed-cell foam strip Material (MPP) is prepared by adopting a supercritical carbon dioxide technology, the foaming process is clean and pollution-free, and the foamed product is sanitary and environment-friendly. The polypropylene is not crosslinked in the foaming process, so that the polypropylene can be recycled, and the process waste and pollution can not be caused.
Compared with the traditional material, the structure of the high-molecular flame-retardant layer adopting a polyetherimide extruded structure has the following advantages:
polyetherimide (PEI) is equivalent to a traditional high polymer material, the processing technology is simpler, the equipment requirement is lower, and the mechanical property is stronger; the polyetherimide flame-retardant layer formed by extrusion has more excellent thermal stability, flame retardance, rheological property and mechanical strength, and a sheath is not easy to wear and crack when the cable is coiled, moved and laid; the polyetherimide flame-retardant layer has high low temperature resistance effect, can be normally used at the temperature of minus 50 ℃, the sheath has strong anti-shrinkage capability, and can be normally laid at the temperature of minus 50 ℃, and the shrinkage rate is less than 0.2%. The polyetherimide sheath has good ageing resistance, and almost no smoke generation and toxic gas release during combustion.
After the new material is adopted, the cable ensures the electrical property and the mechanical property of the cable with a reasonable structure.
After adopting above-mentioned technical scheme, this cable has following beneficial effect:
(1) the cable structure has simple and reasonable design: the three wire cores are arranged in a triangle and are twisted into a cable, which meets the national standard. The filling material is foam, the production process is simple, long-time parking is not needed for releasing stress, and the production efficiency can be greatly improved. The polypropylene closed-cell foam strip Material (MPP) is almost seamless in filling, high in cabling roundness, high in strength, strong in waterproof performance, good in flame retardant property, environment-friendly, non-toxic and good in thermal stability.
(2) The conductor shielding layer, the insulating layer and the insulating shielding layer can form a three-layer co-extrusion structure, the structure greatly improves the low-temperature resistance and the physical and mechanical properties of the cable after dry chemical crosslinking, and the cable has certain water tree resistance, so that the cable has higher mechanical safety and temperature resistance level in the actual use environment.
(3) The high-molecular flame-retardant layer extruded with Polyetherimide (PEI) has certain waterproofness on the basis of meeting the flame-retardant performance. Polyetherimide (PEI) belongs to an environment-friendly material, is nontoxic and odorless after being cured, has no environmental pollution, and can meet the requirement of low temperature resistance of-50 ℃ in the fields of large buildings, rail transit, medicines and the like; the inner sheath can be resistant to chemical corrosion and has good ageing resistance.
(4) The environment-friendly Thermoplastic Polyurethane (TPU) outer sheath is extruded, has better heat insulation performance on the premise of preventing external stress impact in the traditional sense, can not generate spontaneous combustion and release harmful gas under the condition that the flame temperature is 1300 ℃, and does not collapse the body structure, so that the TPU outer sheath can be used in places with high personnel density such as malls and office buildings.
(5) Based on the introduction of new materials and new structures, the specific structure of the cable also ensures the requirements of the electrical property, the mechanical property and the like of the cable.
The cable can pass a flame-retardant A-type bundled combustion test in GB/T18380.33-2008, can meet the qualification index of low toxicity performance in GB/T19666-.
The utility model discloses the cable has used the packing of environmental protection and fire-retardant layer and specific structure simultaneously in order to reach the effect that improves fire-retardant, low toxicity and waterproof performance to can be suitable for and select the use under the higher environment of source, building, rail transit, chemical industry etc. to fire-retardant and environmental protection performance requirement.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
In the figure: waterproof conductor 1, conductor shielding layer 2, insulating layer 3, insulation shielding layer 4, first wind covering 5, fire-retardant waterproof packing 6, second wind covering 7, the third wind covering 8, metal sheath layer 9, the fire-retardant layer 10 of polymer, fourth wind covering 11, oversheath 12.
Detailed Description
The present disclosure is further described with reference to the following drawings and detailed description:
as shown in fig. 1, a low-toxicity environment-friendly longitudinal waterproof medium-voltage power cable based on high polymer materials has the structure that:
the cable core is formed by sequentially wrapping a second wrapping layer 7, a third wrapping layer 8, a metal sheath layer 9, a high polymer flame-retardant layer 10, a fourth wrapping layer 11 and an outer sheath 12 from inside to outside;
the cable core is formed by twisting a plurality of (three in the example) water-blocking wire cores and flame-retardant waterproof filling 6, and the cable pitch-diameter ratio range is 21-38 times;
the second wrapping layer 7 is formed by overlapping and wrapping a layer of double-sided insulating water-blocking tape, and the covering rate is not less than 25%;
the third wrapping layer 8 is formed by overlapping and wrapping a layer of environment-friendly low-smoke halogen-free flame-retardant tape, the average covering rate is not less than 15%, and the minimum covering rate is not less than 10%;
the metal sheath layer 9 is formed by wrapping a copper strip, and the thickness of the copper strip is 0.10-0.15 mm;
the high-molecular flame-retardant layer 10 is formed by extruding polyetherimide materials, the nominal thickness of the high-molecular flame-retardant layer is 2.0-4.5 mm, and the thickness of the thinnest point is not less than 80-0.2 mm of the nominal value;
the fourth wrapping layer 11 is formed by overlapping and wrapping a layer of semi-conductive water-blocking tape, the average covering rate is not less than 20%, and the minimum covering rate is not less than 15%;
the outer sheath 12 is formed by extruding and wrapping an environment-friendly thermoplastic polyurethane sheath material, the nominal thickness is not less than 2.5mm, and the thinnest point thickness is not less than 80-0.2 mm of the nominal value;
the structure of single sinle silk that blocks water does: the waterproof cable comprises a waterproof conductor 1, a conductor shielding layer 2, an insulating layer 3, an insulating shielding layer 4 and a first wrapping layer 5 from inside to outside in sequence;
the water-blocking conductor is a round structure formed by twisting and pressing a second type of conductor, and is formed by twisting metal monofilaments; the metal monofilament is copper monofilament or aluminum monofilament; the metal monofilament of the water-blocking conductor is divided into a plurality of layers from inside to outside, and adjacent twisted layers are separated by an insulating water-blocking tape;
the first lapping layer 5 is formed by lapping a layer of copper strips in an overlapping mode, the nominal value of the lapping rate is not less than 15%, and the minimum lapping rate is not less than 5%.
In this example:
the insulating water-blocking tape between the adjacent stranded layers is of a longitudinal wrapping structure, and the insulating water-blocking tape is overlapped by a lap cover;
a single-side insulating water-blocking tape with the nominal thickness of 0.2mm is longitudinally wrapped between the 1 st and 2 nd twisted layers from inside to outside; in the 2 nd and 3 … … n twisted layers, a double-sided insulating water-blocking tape with the nominal thickness of 0.2mm is longitudinally wrapped between the adjacent twisted layers, and n is a natural number not less than 3.
The conductor has a nominal cross-sectional area of not more than 35mm2The corresponding cabling pitch-diameter ratio of the cable core of the aluminum conductor is 21-27 times; the conductor being a copper conductor, or the conductor being of nominal cross-sectional area greater than 35mm2The corresponding cabling pitch-diameter ratio of the cable core of the aluminum conductor is 28-38 times.
The water-blocking conductor is formed by twisting bare copper monofilaments, and the diameter range of the bare copper monofilaments is 2.22-3.85 mm; the diameter range of the water-blocking conductor is 6.1 mm-37.8 mm; the stranding direction of the bare copper monofilament is the left direction;
alternatively, the first and second electrodes may be,
the water-blocking conductor is formed by twisting bare aluminum monofilaments, and the diameter range of the bare aluminum monofilaments is 2.16-4.70 mm; the diameter range of the water-blocking conductor is 6.0 mm-37.8 m; the twisting direction of the bare aluminum monofilament is the left direction.
The flame-retardant waterproof filling 6 is a modified polypropylene closed-cell foam strip.
The conductor shielding layer 2 and the insulation shielding layer 4 are formed by extruding an environment-friendly peroxide cross-linking type semi-conductive shielding material (the model/brand of the embodiment is HFDA-0587BK or HFDA-0693 BK); the thickness range of the conductor shielding layer 2 is 0.50-1.10 mm; the thickness range of the insulation shielding layer 4 is 0.60-1.10 mm;
the insulating layer 3 is formed by extruding cross-linked polyethylene environment-friendly insulating materials (the model/brand of the insulating material is HFDB-4202EC or HFDC-4202EC), and the thickness range of the insulating layer is 3.2-10.5 mm.
The nominal thickness of the copper strip of the first lapping layer is 0.10 mm;
the nominal thickness of the double-sided insulating water-blocking tape of the second wrapping layer is 0.35 mm;
the nominal thickness of the environment-friendly low-smoke halogen-free flame-retardant belt of the third wrapping layer is 0.20 mm;
the nominal thickness of the semi-conductive water-blocking tape of the fourth wrapping layer is 0.25 mm;
the nominal thickness of the outer sheath is 2.5mm to 5.5 mm.
The metal sheath layer 9 is of a copper strip longitudinal wrapping structure, and the seam of the copper strip is of an (argon arc) welding structure.
The twisting direction of the wire core and the filling material is consistent, and the back-twisting type cabling is adopted.
In the embodiment, when the material is selected, the waterproof filling material is a polypropylene closed cell foam strip Material (MPP) prepared by adopting a supercritical carbon dioxide technology. The high molecular flame-retardant layer is obtained by extruding and wrapping polyetherimide with tetraphenylphosphonium bromide as an end group. The conductor shielding layer and the insulation shielding layer are made of environment-friendly peroxide cross-linked semi-conductive shielding materials, and the main components of the materials are polyolefin base materials, conductive carbon black, antioxidants, copper resisting agents and the like. The insulating material of the insulating layer is a 35kV or below crosslinked polyethylene insulating material taking environment-friendly low-density polyethylene as a base material and peroxide as a crosslinking agent.
The cable of the embodiment has the following detection results, and the test results are qualified:
Claims (8)
1. the utility model provides a low toxicity environmental protection vertical waterproof middling pressure power cable based on macromolecular material which the characterized by structure is:
the cable core is formed by sequentially wrapping a second wrapping layer, a third wrapping layer, a metal sheath layer, a high-molecular flame-retardant layer, a fourth wrapping layer and an outer sheath from inside to outside;
the cable core is formed by a plurality of water-blocking wire cores and flame-retardant waterproof filling and stranding, and the cabling pitch-diameter ratio range is 21-38 times;
the second wrapping layer is formed by overlapping and wrapping a layer of double-sided insulating water-blocking tape, and the covering rate is not less than 25%;
the third wrapping layer is formed by overlapping and wrapping a layer of environment-friendly low-smoke halogen-free flame-retardant tape, the average covering rate is not less than 15%, and the minimum covering rate is not less than 10%;
the metal sheath layer is formed by wrapping a copper strip, and the thickness of the copper strip is 0.10-0.15 mm;
the high-molecular flame-retardant layer is formed by extruding a polyetherimide material, the nominal thickness of the high-molecular flame-retardant layer is 2.0-4.5 mm, and the thickness of the thinnest point is not less than 80-0.2 mm of the nominal value;
the fourth wrapping layer is formed by overlapping and wrapping a layer of semi-conductive water-blocking tape, the average covering rate is not less than 20%, and the minimum covering rate is not less than 15%;
the outer sheath is formed by extruding and wrapping an environment-friendly thermoplastic polyurethane sheath material, the nominal thickness is not less than 2.5mm, and the thinnest point thickness is not less than 80-0.2 mm of the nominal value;
the structure of single sinle silk that blocks water does: the waterproof cable comprises a waterproof conductor, a conductor shielding layer, an insulating shielding layer and a first wrapping layer from inside to outside in sequence;
the water-blocking conductor is a round structure formed by twisting and pressing a second type of conductor, and is formed by twisting metal monofilaments; the metal monofilament is copper monofilament or aluminum monofilament; the metal monofilament of the water-blocking conductor is divided into a plurality of layers from inside to outside, and adjacent twisted layers are separated by an insulating water-blocking tape;
the first lapping layer is formed by lapping a layer of copper strips in an overlapping mode, the nominal value of the lapping rate is not less than 15%, and the minimum lapping rate is not less than 5%.
2. The polymer material-based low-toxicity environment-friendly longitudinal waterproof medium-voltage power cable according to claim 1, wherein the insulating water-blocking tape between adjacent twisted layers is of a longitudinal wrapping structure, and the insulating water-blocking tape is overlapped in a covering manner;
a single-side insulating water-blocking tape with the nominal thickness of 0.2mm is longitudinally wrapped between the 1 st and 2 nd twisted layers from inside to outside;
in the 2 nd and 3 … … n twisted layers, a double-sided insulating water-blocking tape with the nominal thickness of 0.2mm is longitudinally wrapped between the adjacent twisted layers, and n is a natural number not less than 3.
3. The polymer-based low-toxicity environment-friendly longitudinal waterproof medium-voltage power cable according to claim 1, wherein the cable is characterized in that
For conductors having a nominal cross-sectional area of not more than 35mm2The cabling pitch-diameter ratio of the cable core is 21-27 times;
or copper conductors for conductors, or conductors with a nominal cross-sectional area greater than 35mm2The cabling pitch-diameter ratio of the cable core is 28-38 times.
4. The polymer-based low-toxicity environment-friendly longitudinal waterproof medium-voltage power cable according to claim 1, wherein the cable is characterized in that
The water-blocking conductor is formed by twisting bare copper monofilaments, and the diameter range of the bare copper monofilaments is 2.22-3.85 mm; the diameter range of the water-blocking conductor is 6.1 mm-37.8 mm; the stranding direction of the bare copper monofilament is the left direction;
alternatively, the first and second electrodes may be,
the water-blocking conductor is formed by twisting bare aluminum monofilaments, and the diameter range of the bare aluminum monofilaments is 2.16-4.70 mm; the diameter range of the water-blocking conductor is 6.0 mm-37.8 m; the twisting direction of the bare aluminum monofilament is the left direction.
5. The polymer material based low-toxicity environment-friendly longitudinal waterproof medium-voltage power cable according to claim 1, wherein the flame-retardant waterproof filling is composed of modified polypropylene closed-cell foam tapes.
6. The polymer material-based low-toxicity environment-friendly longitudinal waterproof medium-voltage power cable according to claim 1, wherein the conductor shielding layer and the insulation shielding layer are formed by extruding environment-friendly peroxide cross-linked semiconductive shielding material; the thickness range of the conductor shielding layer is 0.50-1.10 mm; the thickness range of the insulating shielding layer is 0.60-1.10 mm;
the insulating layer is formed by extruding and wrapping an environment-friendly insulating material of cross-linked polyethylene, and the thickness range of the insulating layer is 3.2-10.5 mm.
7. The polymer-based low-toxicity environment-friendly longitudinal waterproof medium-voltage power cable according to claim 1, wherein the cable is characterized in that
The nominal thickness of the copper strip of the first lapping layer is 0.10 mm;
the nominal thickness of the double-sided insulating water-blocking tape of the second wrapping layer is 0.35 mm;
the nominal thickness of the environment-friendly low-smoke halogen-free flame-retardant belt of the third wrapping layer is 0.20 mm;
the nominal thickness of the semi-conductive water-blocking tape of the fourth wrapping layer is 0.25 mm;
the nominal thickness of the outer sheath is 2.5mm to 5.5 mm.
8. The polymer-based low-toxicity environment-friendly longitudinal waterproof medium-voltage power cable according to claim 1, wherein the metal sheath layer is of a copper strip longitudinally-wrapped structure, and the seam of the copper strip is of a welded structure.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120991371.6U CN214796789U (en) | 2021-05-11 | 2021-05-11 | Low-toxicity environment-friendly longitudinal waterproof medium-voltage power cable based on high polymer material |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120991371.6U CN214796789U (en) | 2021-05-11 | 2021-05-11 | Low-toxicity environment-friendly longitudinal waterproof medium-voltage power cable based on high polymer material |
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| CN214796789U true CN214796789U (en) | 2021-11-19 |
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