CN211828257U - Low-toxicity environment-friendly medium-voltage power cable based on high-molecular flame-retardant material - Google Patents
Low-toxicity environment-friendly medium-voltage power cable based on high-molecular flame-retardant material Download PDFInfo
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- CN211828257U CN211828257U CN202020365824.XU CN202020365824U CN211828257U CN 211828257 U CN211828257 U CN 211828257U CN 202020365824 U CN202020365824 U CN 202020365824U CN 211828257 U CN211828257 U CN 211828257U
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Abstract
A low-toxicity environment-friendly medium-voltage power cable based on a high-molecular flame-retardant material is structurally characterized in that: the cable core is formed by sequentially wrapping a second wrapping layer, a third wrapping layer, a high polymer flame-retardant layer, a fourth wrapping layer and an outer sheath from inside to outside; the cable core is formed by three wire cores and flame-retardant filling and stranding; the flame-retardant filling is formed by foaming isocyanate group polyimide materials; the second lapping layer is formed by lapping and covering a layer of alkali-free glass fiber tape in an overlapping manner; the third wrapping layer is formed by overlapping and wrapping a layer of environment-friendly low-smoke halogen-free flame-retardant tape; the high molecular flame-retardant layer is formed by extruding polyetherimide material; the fourth wrapping layer is formed by overlapping and wrapping a layer of environment-friendly low-smoke halogen-free flame-retardant tape; the outer sheath is formed by extruding and wrapping environment-friendly low-smoke halogen-free flame-retardant thermosetting EVA sheath materials; the single wire core is structurally provided with a conductor, a conductor shielding layer, an insulating shielding layer and a first wrapping layer from inside to outside in sequence; the conductor is a copper conductor or an aluminum conductor. The cable has high flame retardance and low toxicity.
Description
Technical Field
The utility model relates to a low poison environment-friendly medium voltage power cable based on polymer flame retardant material is applicable to rated voltage 3.6/6kV to 26/35 kV's 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, the requirements of customers on the safety and environmental protection of cables are higher and higher. The development of new materials is also changing day by day, and how to apply the new materials to cables with specific functions and ensure that the electrical property, the mechanical property, the safety performance and the like of the cables meet the requirements is a technical difficulty to be solved at present.
SUMMERY OF THE UTILITY MODEL
Technical problem to be solved
Satisfy fire-retardant and low toxicity's requirement under multiple operational environment to needs, the utility model discloses the problem that the cable need be solved mainly has: although the low-toxicity cable has been published with the latest standard, industrial users are strange to low-toxicity performance and lack related production and test experience, and from the perspective of cable design, the requirements of low-toxicity test examination are provided on the basis of meeting the flame-retardant performance of the cable, and the filling of the cable and the flame-retardant performance and the low-toxicity performance of a sheath are improved.
Technical scheme adopted for solving the technical problems
A low-toxicity environment-friendly medium-voltage power cable based on a high-molecular flame-retardant material is characterized by comprising the following structures:
the cable core is formed by sequentially wrapping a second wrapping layer, a third wrapping layer, a high polymer flame-retardant layer, a fourth wrapping layer and an outer sheath from inside to outside;
the cable core is formed by three wire cores and flame-retardant filling and stranding, and the stranding pitch-diameter ratio ranges from 22 to 35; the flame-retardant filling is formed by foaming isocyanate group polyimide;
the second lapping layer is formed by lapping and covering a layer of alkali-free glass fiber tape in an overlapping manner;
the third wrapping layer is formed by overlapping and wrapping a layer of environment-friendly low-smoke halogen-free flame-retardant tape;
the high-molecular flame-retardant layer is formed by extruding a polyetherimide material, the nominal thickness of the high-molecular flame-retardant layer is 1.8-3.5 mm, and the thickness of the thinnest point is not less than 85-0.1 mm of the nominal value;
the fourth wrapping layer is formed by overlapping and wrapping a layer of environment-friendly low-smoke halogen-free flame-retardant tape;
the outer sheath is formed by extruding and wrapping environment-friendly low-smoke halogen-free flame-retardant thermosetting EVA sheath materials;
the single wire core is structurally provided with a conductor, a conductor shielding layer, an insulating shielding layer and a first wrapping layer from inside to outside in sequence; the conductor is a copper conductor or an aluminum conductor.
Further:
case a: the cross-sectional area is not more than 70mm2The aluminum conductor forms a cable, and the cabling pitch-diameter ratio of a cable core is 22-28;
in the other cases except the case a, the cabling pitch-diameter ratio of the cable core of the cable is 25-35.
The conductor is a copper conductor or an aluminum conductor;
the copper conductor is formed by twisting bare copper monofilaments, and the diameter range of the bare copper monofilaments is 2.21-3.50 mm; the diameter range of the conductor is 6.0 mm-34.1 mm; the stranding direction of the bare copper monofilament is the left direction;
the aluminum conductor is formed by twisting bare aluminum monofilaments, and the diameter range of the bare aluminum monofilaments is 2.16-4.30 mm; the diameter range of the conductor is 6.0 mm-34.0 mm; the twisting direction of the bare aluminum monofilament is the left direction.
The isocyanate-based polyimide contains a red phosphorus hybrid graphene flame retardant.
The conductor shielding layer and the insulation shielding layer are formed by extruding and wrapping an environment-friendly peroxide cross-linked semi-conductive shielding material; the insulating layer is formed by extruding and wrapping an environment-friendly insulating material of cross-linked polyethylene.
The first wrapping layer is formed by overlapping and wrapping a layer of soft copper tape, the nominal thickness of the soft copper tape is 0.10mm, the nominal value of the average covering rate of the wrapping is not less than 15%, and the minimum covering rate is not less than 5%;
the nominal thickness of the alkali-free glass fiber tape of the second lapping layer is 0.20mm, and the lapping and covering rate is not less than 25%;
the nominal thickness of the environment-friendly low-smoke halogen-free flame-retardant tape of the third wrapping layer is 0.20mm, and the wrapping overlapping rate is not less than 17%;
the nominal thickness of the environment-friendly low-smoke halogen-free flame-retardant tape of the fourth wrapping layer is 0.20mm, and the wrapping overlapping rate is not less than 17%;
the nominal thickness of the outer sheath is 1.8 mm-5.6 mm, and the thickness of the thinnest point is not less than 85-0.1 mm of the nominal value.
Compared with the traditional filling material, the flame-retardant filling material adopts isocyanate-based Polyimide (PI) foam, and has the following structural performance advantages:
the cable core cabling adopts the flame-retardant filling material for filling, the filling is compact and round, the flame-retardant filling material is isocyanate-based Polyimide (PI) foam, and the flame-retardant 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 covalent bond between the graphene and the PI matrix enables isocyanate-based Polyimide (PI) foam to have higher Young modulus, and the isocyanate-based Polyimide (PI) foam can reach a very high limiting oxygen index (39.4) by adding a very small amount of red phosphorus hybrid graphene flame retardant (2.2 wt%), wherein the oxygen index is higher than that of a common polymer flame retardant material (the oxygen index of the common polymer flame retardant material is about 20-30). Because red phosphorus can reach nanometer dispersion at the graphite alkene piece surface for isocyanate group Polyimide (PI) foam has the insulating nature that is equivalent to air, and has higher intensity, can bear great longitudinal and radial stress. The material is processed by a more advanced ball milling method, no organic solvent is needed in the production process, no waste is generated, the material is environment-friendly and non-toxic, and the yield is close to 100%.
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 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 isocyanate group Polyimide (PI) foam is almost seamless in filling, high in cabling roundness, high in strength, good in flame retardant property, environment-friendly and non-toxic, and has certain waterproof property.
(2) The conductor shielding layer, the insulating layer and the insulating shielding layer can form a three-layer co-extrusion structure, and the structure greatly improves the low-temperature resistance and the physical and mechanical properties of the cable after dry chemical crosslinking, 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) Based on the introduction of new materials, 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 class A bundled combustion test in GB/T18380.33-2008 and can meet the qualified index of low toxicity performance in GB/T19666-2019.
The utility model discloses the cable has used the packing of environmental protection simultaneously and fire-retardant layer and specific structure in order to reach the effect that improves fire-retardant and low toxicity ability to can be suitable for under the higher environment of source, building, track traffic, chemical industry etc. requirement to fire-retardant and environmental protection performance and select the use.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
In the figure: 1. a conductor; 2. a conductor shield layer; 3. an insulating layer; 4. an insulating shield layer; 5. a first lapping layer; 6. flame-retardant filling; 7. a second lapping layer; 8. a third lapping layer; 9. a polymeric flame retardant layer; 10. a fourth lapping layer; 11. an outer sheath.
Detailed Description
As shown in fig. 1, the low-toxicity environment-friendly medium-voltage power cable based on the high-molecular flame retardant material has the following structure:
the cable core is formed by sequentially wrapping a second wrapping layer, a third wrapping layer, a high polymer flame-retardant layer, a fourth wrapping layer and an outer sheath from inside to outside;
the cable core is formed by three wire cores and flame-retardant filling and stranding, and the stranding pitch-diameter ratio ranges from 22 to 35;
the second lapping layer is formed by lapping and covering a layer of alkali-free glass fiber tape in an overlapping manner;
the third wrapping layer is formed by overlapping and wrapping a layer of environment-friendly low-smoke halogen-free flame-retardant tape;
the high-molecular flame-retardant layer is formed by extruding a polyetherimide material with tetraphenylphosphonium bromide as an end group, the nominal thickness of the high-molecular flame-retardant layer is 1.8-3.5 mm, and the thickness of the thinnest point is not less than 85-0.1 mm of the nominal value;
the fourth wrapping layer is formed by overlapping and wrapping a layer of environment-friendly low-smoke halogen-free flame-retardant tape;
the outer sheath is formed by extruding and wrapping environment-friendly low-smoke halogen-free flame-retardant thermosetting EVA sheath materials;
the single wire core is structurally provided with a conductor, a conductor shielding layer, an insulating shielding layer and a first wrapping layer from inside to outside in sequence; the conductor is a copper conductor or an aluminum conductor.
Case a: the cross-sectional area is not more than 70mm2The aluminum conductor forms a cable, and the cabling pitch-diameter ratio of a cable core is 22-28;
in the other cases except the case a, the cabling pitch-diameter ratio of the cable core of the cable is 25-35.
The conductor may be a copper conductor or an aluminum conductor; the copper conductor is formed by twisting bare copper monofilaments, and the diameter range of the bare copper monofilaments is 2.21-3.50 mm; the diameter range of the conductor is 6.0 mm-34.1 mm; the twisting direction of the bare copper monofilament is the left direction. The aluminum conductor is formed by twisting bare aluminum monofilaments, and the diameter range of the bare aluminum monofilaments is 2.16-4.30 mm; the diameter range of the conductor is 6.0 mm-34.0 mm; the twisting direction of the bare aluminum monofilament is the left direction.
In this example, the twisting direction of the wire core is the same as that of the filling material, and back-twisting type cabling is adopted.
The nominal thickness of the soft copper strip of the first lapping layer is 0.10mm, the lapping average lapping rate is not less than 15% (nominal value), and the minimum lapping rate is not less than 5%.
The nominal thickness of the alkali-free glass fiber tape of the second lapping layer is 0.20mm, and the lapping and covering rate is not less than 25%;
the nominal thickness of the environment-friendly low-smoke halogen-free flame-retardant tape of the third wrapping layer is 0.20mm, and the wrapping overlapping rate is not less than 17%;
the nominal thickness of the environment-friendly low-smoke halogen-free flame-retardant tape of the fourth wrapping layer is 0.20mm, and the wrapping overlapping rate is not less than 17%.
The nominal thickness of the outer sheath is 1.8 mm-5.6 mm, and the thickness of the thinnest point is not less than 85-0.1 mm of the nominal value.
The high molecular flame-retardant layer is formed by extruding and wrapping polyetherimide with tetraphenylphosphonium bromide as an end group; the nominal thickness is 1.8 mm-3.5 mm, and the thickness of the thinnest point is not less than 85-0.1 mm of the nominal value.
In the embodiment, when the material is selected, the flame-retardant filling material is isocyanate-based Polyimide (PI) foam using red phosphorus hybrid graphene as a flame retardant. 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 (5)
1. a low-toxicity environment-friendly medium-voltage power cable based on a high-molecular flame-retardant material is characterized by comprising the following structures:
the cable core is formed by sequentially wrapping a second wrapping layer, a third wrapping layer, a high polymer flame-retardant layer, a fourth wrapping layer and an outer sheath from inside to outside;
the cable core is formed by three wire cores and flame-retardant filling and stranding, and the stranding pitch-diameter ratio ranges from 22 to 35; the flame-retardant filling is formed by foaming an isocyanate group polyimide material;
the second lapping layer is formed by lapping and covering a layer of alkali-free glass fiber tape in an overlapping manner;
the third wrapping layer is formed by overlapping and wrapping a layer of environment-friendly low-smoke halogen-free flame-retardant tape;
the high-molecular flame-retardant layer is formed by extruding a polyetherimide material, the nominal thickness of the high-molecular flame-retardant layer is 1.8-3.5 mm, and the thickness of the thinnest point is not less than 85-0.1 mm of the nominal value;
the fourth wrapping layer is formed by overlapping and wrapping a layer of environment-friendly low-smoke halogen-free flame-retardant tape;
the outer sheath is formed by extruding and wrapping environment-friendly low-smoke halogen-free flame-retardant thermosetting EVA sheath materials;
the single wire core is structurally provided with a conductor, a conductor shielding layer, an insulating shielding layer and a first wrapping layer from inside to outside in sequence; the conductor is a copper conductor or an aluminum conductor.
2. The low-toxicity environment-friendly medium-voltage power cable based on high-molecular flame-retardant material as claimed in claim 1, wherein the cable is characterized in that
Case a: the cross-sectional area is not more than 70mm2The aluminum conductor forms a cable, and the cabling pitch-diameter ratio of a cable core is 22-28;
in the other cases except the case a, the cabling pitch-diameter ratio of the cable core of the cable is 25-35.
3. The low-toxicity environment-friendly medium-voltage power cable based on high-molecular flame-retardant material as claimed in claim 1, wherein the conductor is a copper conductor or an aluminum conductor;
the copper conductor is formed by twisting bare copper monofilaments, and the diameter range of the bare copper monofilaments is 2.21-3.50 mm; the diameter range of the conductor is 6.0 mm-34.1 mm; the stranding direction of the bare copper monofilament is the left direction;
the aluminum conductor is formed by twisting bare aluminum monofilaments, and the diameter range of the bare aluminum monofilaments is 2.16-4.30 mm; the diameter range of the conductor is 6.0 mm-34.0 mm; the twisting direction of the bare aluminum monofilament is the left direction.
4. The low-toxicity environment-friendly medium-voltage power cable based on the high-molecular flame retardant material as claimed in 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 insulating layer is formed by extruding and wrapping an environment-friendly insulating material of cross-linked polyethylene.
5. The low-toxicity environment-friendly medium-voltage power cable based on high-molecular flame-retardant material as claimed in claim 1, wherein the cable is characterized in that
The first wrapping layer is formed by overlapping and wrapping a layer of soft copper tape, the nominal thickness of the soft copper tape is 0.10mm, the nominal value of the average covering rate of the wrapping is not less than 15%, and the minimum covering rate is not less than 5%;
the nominal thickness of the alkali-free glass fiber tape of the second lapping layer is 0.20mm, and the lapping and covering rate is not less than 25%;
the nominal thickness of the environment-friendly low-smoke halogen-free flame-retardant tape of the third wrapping layer is 0.20mm, and the wrapping overlapping rate is not less than 17%;
the nominal thickness of the environment-friendly low-smoke halogen-free flame-retardant tape of the fourth wrapping layer is 0.20mm, and the wrapping overlapping rate is not less than 17%;
the nominal thickness of the outer sheath is 1.8 mm-5.6 mm, and the thickness of the thinnest point is not less than 85-0.1 mm of the nominal value.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020365824.XU CN211828257U (en) | 2020-03-21 | 2020-03-21 | Low-toxicity environment-friendly medium-voltage power cable based on high-molecular flame-retardant material |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020365824.XU CN211828257U (en) | 2020-03-21 | 2020-03-21 | Low-toxicity environment-friendly medium-voltage power cable based on high-molecular flame-retardant material |
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| CN211828257U true CN211828257U (en) | 2020-10-30 |
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| CN202020365824.XU Active CN211828257U (en) | 2020-03-21 | 2020-03-21 | Low-toxicity environment-friendly medium-voltage power cable based on high-molecular flame-retardant material |
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