CN214796798U - Single-core large-section super-flexible low-voltage power cable - Google Patents
Single-core large-section super-flexible low-voltage power cable Download PDFInfo
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- CN214796798U CN214796798U CN202120775967.2U CN202120775967U CN214796798U CN 214796798 U CN214796798 U CN 214796798U CN 202120775967 U CN202120775967 U CN 202120775967U CN 214796798 U CN214796798 U CN 214796798U
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Abstract
A single-core large-section super-flexible low-voltage power cable is composed of an insulating layer and an outer sheath layer which are sequentially wrapped outside a conductor; cross section of conductorThe product is 300mm2～630mm2(ii) a The conductor is a 5-class copper conductor composed of a plurality of bare copper wires, and the diameter range of the bare copper wires is 0.193 mm-0.29 mm; the bare copper wires are bundled to form a folded yarn, the bundling direction is the left direction, and the bundling pitch diameter ratio is 20-25 times; the multiple strands are twisted repeatedly to form a conductor, the twisting directions are left, the strands are divided into multiple layers from inside to outside, the twist pitch diameter ratio of the strands on the outermost layer is 13-15 times, the twist pitch diameter ratio of the strands on the secondary outer layer is 14-16 times, and the twist pitch diameter ratio of the strands on the other layers is 18-25 times; the insulating layer is formed by extruding and wrapping an elastomer insulating material; the outer sheath layer 1 is formed by extruding and wrapping an elastomer sheath material. The cable has the characteristics of larger conductor section and ultrahigh flexibility.
Description
Technical Field
The utility model belongs to the technical field of the cable, specifically a single core large cross-section super flexibility low voltage power cable.
Background
In the prior art, important technical indexes of cables matched with systems or equipment are current-carrying capacity and flexibility, and the aim is to ensure that the cables can pass through a certain current amount when transporting electric energy for a long time in a special laying space in a special laying mode so as to ensure normal power supply.
To ensure current carrying capacity, the conductor cross-section is 300mm2～630mm2The single-core large-section power cable is an indispensable cable product, and the cable only comprises three functional structures, namely a conductor, an insulating layer and an outer sheath. The cable of the type requires that the number of the monofilaments is as thin as possible and as many as possible, the direction of conductor bundle twisting and compound twisting is consistent, and wrapping strips cannot be arranged outside the conductor, so that the cable with the structure is easy to float and break, stranded wires and the conductor are easy to loosen, and the insulation wrapping is easy to cause eccentricity.
Disclosure of Invention
Utility model purpose: in order to solve the problems, in the production process, the monofilament needs to be solidified, the binding pitch-diameter ratio and the production speed are set, a proper pressing die, the composite twisting pitch-diameter ratio and the twisting cage rotating speed are adopted during composite twisting, the tension is adjusted during insulation wrapping, and the conductor level is ensured as far as possible. While these measures are taken, there is still a risk of floating filaments, broken filaments and unacceptable structural dimensions.
It can obtain qualified cable product based on existing production resource to ensure the cable, the utility model discloses starting with cable structure detail design, through reasonable structural design, reduce the production degree of difficulty, improve production qualification rate and production efficiency.
The utility model relates to a single-core large-section super-flexible low-voltage power cable, the outer diameter of the cable is 36 mm-50 mm, and the voltage-resistant grade of the cable is 0.6/1 kV; the cable is composed of an insulating layer 2 and an outer sheath layer 1 which are sequentially wrapped outside a conductor 3;
the cross-sectional area of the conductor 3 is 300mm2～630mm2；
The conductor 3 is a 5-class copper conductor composed of a plurality of bare copper wires, and the diameter range of the bare copper wires is 0.193 mm-0.29 mm; the bare copper wires are bundled to form a folded yarn 4, the bundling direction is the left direction, and the bundling pitch diameter ratio is 20-25 times; the multiple strands are twisted repeatedly to form a conductor, the twisting directions are left, the strands are divided into multiple layers from inside to outside, the twist pitch diameter ratio of the strands on the outermost layer is 13-15 times, the twist pitch diameter ratio of the strands on the secondary outer layer is 14-16 times, and the twist pitch diameter ratio of the strands on the other layers is 18-25 times;
from the structural principle, although the conductors are easy to loosen due to the fact that the bunching direction and the complex twisting direction are the same, the cable has better bending performance and meets different laying conditions and states. The scheme adopts the solidified bundle twisting and complex twisting pitch diameter ratio to reduce the risks of strand floating and broken yarns and ensure the structural size of the cable material of the follow-up insulating layer and the outer sheath layer during extrusion. Meanwhile, the structural parameters of the conductor enable the cable conductor to have larger current-carrying capacity while ensuring the flexibility of the cable.
During production, the ratio of the conductor bundle twisting pitch to the complex twisting pitch is controlled within the range.
The insulating layer 2 is formed by extruding and wrapping an elastomer insulating material; the nominal thickness of the insulating layer is 1.8 mm-2.4 mm, the average thickness is not less than the nominal thickness, and the thinnest thickness is not less than 90-0.1 mm of the nominal thickness.
The design of the insulating layer can reduce the thickness of the insulating layer as much as possible on the premise of meeting the insulating requirement, thereby reducing the outer diameter of the cable and reducing the consumption of other materials. The cable has special laying form requirements, the requirements on the mechanical properties of the cable before and after insulation aging are higher, the insulation layer enables the cable to be more flexible in the laying process, the service life is longer, and the electrical properties meet the standard requirements. On the premise of meeting the size of an insulating structure, the structure of the insulating layer optimizes the mechanical property after irradiation (taking irradiation crosslinking polyolefin insulating material as an example).
The outer sheath layer 1 is formed by extruding and wrapping an elastomer sheath material; the nominal thickness of the outer sheath layer is 1.8 mm-2.2 mm; the average thickness is not less than the nominal thickness, and the thinnest thickness is not less than 85-0.1 mm of the nominal thickness. The special laying form requirement of a using object has higher requirement on the mechanical performance of the cable sheath before and after aging. The sheath structure enables the cable to be more flexible in the laying process, the service life is longer, and the electrical performance meets the standard requirements.
Through the design, on the premise of meeting the structural size requirements of the insulating layer and the outer sheath layer, the cable is favorable for improving the production efficiency and the product quality, reducing the production loss and meeting the spark withstand voltage test of the response standard.
The elastomeric insulation is radiation crosslinked polyolefin insulation.
For the conductor with the largest cross section area in the cable applicable structure:
the cross-sectional area of the conductor is 630mm2The withstand voltage of the cable is 0.6/1kV, and the outer diameter of the cable is 49.8mm, for example:
the diameter of the bare copper wire of the conductor is 0.29 mm; the thickness of the insulating layer is 2.4 mm; the thickness of the outer jacket layer was 2.2 mm.
The strand bundle joint diameter ratio of the conductor is 23 times; the complex twisting pitch diameter ratio of the strands at the outermost layer is 13 times, the complex twisting pitch diameter ratio of the strands at the secondary outer layer is 14 times, and the complex twisting pitch diameter ratio of the strands at the other inner layers is 18 times. The compound twisting required folded yarn is designed according to the structure of 1+6+12+18+ 30.
In this configuration, the minimum bend radius of the cable is only 6D (D is the outer diameter of the cable).
Compared with the prior art, the cable adopts a specific structural design, all parts of the structure supplement each other, in order to realize the performance of large section and super softness, the passive factors in the material characteristics of the conductor, the insulating layer and the outer sheath layer are reduced to the minimum, and the active factors in all materials are exerted. In the design of the cable structure, the limitation of the existing production conditions of cable production is fully considered, the existing production conditions are fully utilized, the difficulty brought to production by product design is avoided, the cable is smoothly guided into production, and the production efficiency and the product percent of pass are improved.
Drawings
Fig. 1 is a schematic structural diagram of the cable according to the embodiment.
In the figure: the cable comprises an outer sheath layer 1, an insulating layer 2, a conductor 3 and a stranded wire 4.
Detailed Description
The technical solution of the present invention will be described in detail with reference to the accompanying drawings, but the scope of the present invention is not limited to the embodiments.
Referring to fig. 1, the outer diameter of a single-core large-section super-flexible low-voltage power cable is 36 mm-50 mm, and the voltage-resistant grade of the cable is 0.6/1 kV; the cable is composed of an insulating layer 2 and an outer sheath layer 1 which are sequentially wrapped outside a conductor 3; the radial cross-sectional area of the conductor 3 is 300mm2～630mm2；
The conductor 3 is a 5-class copper conductor composed of a plurality of bare copper wires, and the diameter range of the bare copper wires is 0.193 mm-0.29 mm; the bare copper wires are bundled to form a folded yarn 4, the bundling direction is the left direction, and the bundling pitch diameter ratio is 20-25 times; the multiple strands are twisted repeatedly to form a conductor, the twisting directions are left, the strands are divided into multiple layers from inside to outside, the twist pitch diameter ratio of the strands on the outermost layer is 13-15 times, the twist pitch diameter ratio of the strands on the secondary outer layer is 14-16 times, and the twist pitch diameter ratio of the strands on the other layers is 18-25 times;
during production, the ratio of the conductor bundle twisting pitch to the complex twisting pitch is controlled within the range.
The insulating layer 2 is formed by extruding and wrapping an elastomer insulating material; the nominal thickness of the insulating layer is 1.8 mm-2.4 mm, the average thickness is not less than the nominal thickness, and the thinnest thickness is not less than 90-0.1 mm of the nominal thickness.
The outer sheath layer 1 is formed by extruding and wrapping an elastomer sheath material; the nominal thickness of the outer sheath layer is 1.8 mm-2.2 mm; the average thickness is not less than the nominal thickness, and the thinnest thickness is not less than 85-0.1 mm of the nominal thickness.
The elastomeric insulation is radiation crosslinked polyolefin insulation.
Take the conductor with the largest cross-sectional area as an example:
the cross-sectional area of the conductor is 630mm2The withstand voltage of the cable was 0.6/1kV, and the outer diameter of the cable was 49.8 mm.
The diameter of the bare copper wire of the conductor is 0.29 mm; the thickness of the insulating layer is 2.4 mm; the thickness of the outer jacket layer was 2.2 mm. The strand bundle joint diameter ratio of the conductor is 23 times; the complex twisting pitch diameter ratio of the strands at the outermost layer is 13 times, the complex twisting pitch diameter ratio of the strands at the secondary outer layer is 14 times, and the complex twisting pitch diameter ratio of the strands at the other inner layers is 18 times. The multiple strands are twisted to form a conductor, and the number of the strands in each layer is 1, 6, 12, 18 and 30 from inside to outside in sequence.
The radiation crosslinked polyolefin insulation may be selected from the insulation grades X-HF-90 or X-HF-110 or R-E-110, in this case the elastomer insulation grade R-E-110.
The elastomer sheath material can be selected from TPE or HFS-110-TP sheath material, and the elastomer sheath material is the TPE elastomer sheath material.
In this example 630mm2For the production of the flexible conductor of (2):
in the past, the same kind of cable consumes 5.7 tons of copper materials, 320kg of insulating materials and 442kg of sheathing materials every kilometer of production. The excellence rate of the product reaches 98%, and the minimum bending radius of the cable is 12D (D is the outer diameter of the cable).
When the cable structure is adopted to produce cables, 5.5 tons of copper materials are consumed, 320kg of insulating materials are consumed, and 401kg of sheath materials are consumed when one kilometer of cables are produced. The product excellence rate reaches 99%, and the minimum bending radius of the cable is 6D through tests.
Tests show that the conductor bundle twisting structure has an important influence on the flexibility of the cable on the basis of meeting the mechanical properties such as tensile strength and the like of the cable.
After detection, the performance parameters of the cable of the embodiment are as follows:
(1)4 hours high voltage ac test: 1.8kV/4h is not broken down.
(2) Finished cable compatibility test (120 ℃/240 h): an insulation tensile strength retention of at least 75% (in particular 103%), an insulation elongation at break retention of at least 65% (in particular 87%); the sheath has a minimum retention of 75% tensile strength (specifically 124%) and a minimum retention of 65% elongation at break (specifically 91%) of the sheath.
(3) The finished sheath is qualified in the cracking resistance test.
(4) Insulating thermal extension: 200 ℃, 15min, 0.2N/mm2Under the condition that the maximum elongation under load is 175% or less (specifically 65%) and the maximum permanent elongation after cooling is 15% or less (specifically 0%).
(5) Insulation resistance constant: at 20 ℃, the minimum of 40G omega m (particularly 11097G omega m); at 90 ℃, the minimum is 0.02 G.OMEGA.m (735 G.OMEGA.m).
(6) Mechanical properties before and after insulation aging: a tensile strength before aging of not less than 5.0MPa (specifically 11.8MPa), and an elongation at break of not less than 125% (specifically 510%); after aging at 150 ℃ for 168 hours, the retention of tensile strength is 70% minimum (in particular 98%) and the retention of elongation at break is 70% minimum (in particular 106%).
(7) Mechanical properties before and after jacket aging: a tensile strength before aging of not less than 6MPa (specifically 15.7MPa) and an elongation at break of not less than 125% (specifically 540%); after aging at 110 deg.C for 480 hr, the tensile strength is not less than 6MPa (specifically 15.8MPa), and the elongation at break is not less than 100% (specifically 520%).
(8) Single vertical flame test: the distance between the lower edge of the upper bracket and the starting point of the carbonization part is more than 50mm (381 mm in particular), and the distance between the lower edge of the upper bracket and the starting point of the carbonization part is less than 540mm (491 mm in particular) when the combustion is extended downwards.
(9) Cable minimum bend radius 6D.
Claims (6)
1. A single-core large-section super-flexible low-voltage power cable has the outer diameter of 36-50 mm and the voltage-resistant grade of 0.6/1 kV; the cable is composed of an insulating layer and an outer sheath layer which are sequentially wrapped outside a conductor; the cross-sectional area of the conductor is 300mm2～630mm2The conductor is a 5-class copper conductor consisting of a plurality of bare copper wires, and the diameter range of the bare copper wires is 0.193 mm-0.29 mm;
the bare copper wires are bundled to form a folded yarn, the bundling direction is the left direction, and the bundling pitch diameter ratio is 20-25 times;
the multiple strands are twisted repeatedly to form a conductor, the twisting directions are left, the strands are divided into multiple layers from inside to outside, the twist pitch diameter ratio of the strands on the outermost layer is 13-15 times, the twist pitch diameter ratio of the strands on the secondary outer layer is 14-16 times, and the twist pitch diameter ratio of the strands on the other layers is 18-25 times;
the insulating layer is formed by extruding and wrapping an elastomer insulating material; the nominal thickness of the insulating layer is 1.8 mm-2.4 mm, the average thickness is not less than the nominal thickness, and the thinnest thickness is not less than 90-0.1 mm of the nominal thickness;
the outer sheath layer is formed by extruding and wrapping an elastomer sheath material; the nominal thickness of the outer sheath layer is 1.8 mm-2.2 mm; the average thickness is not less than the nominal thickness, and the thinnest thickness is not less than 85-0.1 mm of the nominal thickness.
2. A single core large cross section ultra-flexible low voltage power cable as claimed in claim 1 wherein said elastomeric insulation is radiation cross-linked polyolefin insulation.
3. A single core large cross section ultra flexible low voltage power cable as claimed in claim 1 wherein said conductor cross section is 630mm2。
4. A single core large cross section ultra flexible low voltage power cable as claimed in claim 3 wherein the conductor has a strand lay to pitch ratio of 23 times;
a plurality of strands are twisted to form a conductor, and the number of the strands in each layer is 1, 6, 12, 18 and 30 from inside to outside in sequence;
the complex twisting pitch diameter ratio of the strands at the outermost layer is 13 times, the complex twisting pitch diameter ratio of the strands at the secondary outer layer is 14 times, and the complex twisting pitch diameter ratio of the strands at the other inner layers is 18 times.
5. A single core large cross section ultra flexible low voltage power cable as claimed in claim 3 wherein the diameter of the bare copper wire of the conductor is 0.29 mm; the thickness of the insulating layer was 2.4 mm.
6. A single core large cross section ultra flexible low voltage power cable as claimed in claim 3 wherein said outer jacket layer has a thickness of 2.2 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120775967.2U CN214796798U (en) | 2021-04-16 | 2021-04-16 | Single-core large-section super-flexible low-voltage power cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120775967.2U CN214796798U (en) | 2021-04-16 | 2021-04-16 | Single-core large-section super-flexible low-voltage power cable |
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| Publication Number | Publication Date |
|---|---|
| CN214796798U true CN214796798U (en) | 2021-11-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120775967.2U Active CN214796798U (en) | 2021-04-16 | 2021-04-16 | Single-core large-section super-flexible low-voltage power cable |
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| CN (1) | CN214796798U (en) |
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- 2021-04-16 CN CN202120775967.2U patent/CN214796798U/en active Active
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