CN214796797U

CN214796797U - Environment-friendly low-temperature laid power cable

Info

Publication number: CN214796797U
Application number: CN202120775566.7U
Authority: CN
Inventors: 鄢超; 李斌; 祝军; 凌国桢; 狄洪杰
Original assignee: Jiangsu Shangshang Cable Group Co Ltd; Jiangsu Shangshang Cable Group New Material Co Ltd
Current assignee: Jiangsu Shangshang Cable Group Co Ltd; Jiangsu Shangshang Cable Group New Material Co Ltd
Priority date: 2021-04-16
Filing date: 2021-04-16
Publication date: 2021-11-19
Anticipated expiration: 2031-04-16

Abstract

An environment-friendly low-temperature laying power cable, wherein the rated voltage grade of the cable is 0.6/1 kV; the structure of the cable is as follows: the outer diameter range of the cable is 16-45 mm; the cable is formed by a plurality of wire cores and a filling twisted cable core, and the cable core is sequentially wrapped by a wrapping layer and an outer sheath; the filling is made of environment-friendly non-hygroscopic material; the wire core is formed by wrapping an insulating layer outside a conductor; the conductor is formed by twisting a plurality of copper monofilaments, the ratio of the twisting pitch diameter is 10-25 times, and the outer diameter of each copper monofilament is 0.23-3.33 mm; the insulating layer is made of an environment-friendly irradiation crosslinked polyethylene insulating material, and the thickness range of the insulating layer is 0.7-2.0 mm; the wrapping layer is formed by wrapping an environment-friendly non-hygroscopic wrapping tape, and the wrapping and covering rate is not less than 15%; the width of the lapping overlapping part is not less than 5 mm; the outer sheath is made of environment-friendly polyethylene sheath materials, and the thickness range of the outer sheath is 1.8-3 mm.

Description

Environment-friendly low-temperature laid power cable

Technical Field

This technical scheme belongs to cable technical field, specifically is an environment-friendly low temperature lays power cable.

Background

At present, in most areas of China, a power cable is easy to crack when laid in winter or in some areas below zero for a long time, so that the service life and the service performance of the cable are influenced. This requires that the cable can be installed and used normally in low temperature environment and still have good mechanical and electrical properties in low temperature environment.

Disclosure of Invention

In order to improve the mechanical property, the electrical property and the environmental protection property of the cable during low-temperature laying. Now, an environment-friendly low-temperature laid power cable is proposed:

the utility model provides an environment-friendly low temperature lays power cable, the rated voltage class that this cable was suitable for is 0.6/1kV, characterized by the structure of cable is: the outer diameter range of the cable is 16-45 mm;

the cable is formed by a plurality of wire cores and a filling twisted cable core, and the cable core is sequentially wrapped by a wrapping layer and an outer sheath; the stranding pitch diameter ratio of the cable core is 30-40 times;

the filling is made of environment-friendly non-hygroscopic material;

the wire core is formed by wrapping an insulating layer outside a conductor; the range of the cross-sectional area of the conductor is 1.5-400 mm²(ii) a The conductor is formed by twisting a plurality of copper monofilaments, the ratio of the twisting pitch diameter is 10-25 times, and the outer diameter of each copper monofilament is 0.23-3.33 mm; the insulating layer is made of an environment-friendly irradiation crosslinked polyethylene insulating material, and the thickness range of the insulating layer is 0.7-2.0 mm;

the wrapping layer is formed by wrapping an environment-friendly non-hygroscopic wrapping tape, and the wrapping and covering rate is not less than 15%; the width of the lapping overlapping part is not less than 5 mm;

the outer sheath is made of environment-friendly polyethylene sheath materials, and the thickness range of the outer sheath is 1.8-3 mm.

Further, the filling concrete polypropylene net tears the thin filling rope. The environment-friendly non-hygroscopic wrapping tape is a polyethylene tape, and the width of the polyethylene tape is 0.4mm, 0.5mm or 0.6 mm.

Specifically, the method comprises the following steps:

the withstand voltage requirement of the cable is 3.5kV/5min, the number of the wire cores is 3, and the outer diameter of the cable is 27.2 mm; the stranding pitch diameter ratio of the cable core is 25 times; the cross-sectional area of the conductor is 50mm²The outer diameter is 8.2mm, and the pitch-diameter ratio of the twisted copper monofilaments is 15 times; the thickness of the insulating layer is 1.0 mm; the thickness of the outer sheath is 1.8 mm. The width of the polyethylene tape was 0.5 mm.

The cable structurally comprises a conductor, an insulating layer, filling, a wrapping layer and an outer sheath. The cable is characterized in that a layer of environment-friendly insulating material is evenly extruded outside a plurality of strands of copper conductors, an environment-friendly non-hygroscopic material is filled between adjacent insulation, an environment-friendly wrapping tape is wound on a cable core, and a layer of environment-friendly sheathing material is extruded outside the wrapping layer. The insulating layer is made of environment-friendly cross-linked polyethylene insulating material. The filling and wrapping layers are made of environment-friendly non-hygroscopic materials. The outer sheath is made of environment-friendly polyethylene sheath material.

The conductor of this cable is many copper monofilament transposition structure, and single wire that compares in like cable is difficult to be crooked, the compliance is poor, production transportation is inconvenient, and the installation lays the first problem of difficulty, and the stranded conductor structure of this cable has good stability, compliance, reliability, and the installation is laid conveniently. For the convenience of laying, the twisted conductor adopts a proper small pitch ratio, the twisting is tighter, and the conductor is softer.

The crosslinked polyethylene insulating material of the insulating layer is subjected to irradiation crosslinking, so that polyethylene molecules are changed into a three-dimensional network structure from a linear molecular structure, the carrying capacity of the cable is improved, the working temperature can reach 90 ℃ at most, the crosslinked polyethylene insulating material keeps the original insulating property of polyethylene, the insulating resistance is increased, and the crosslinked polyethylene insulating material is insensitive to temperature change. For the cable with the voltage grade, the insulating layer with the specific thickness is adopted, so that the cable has good electrical property and temperature resistance.

The filling is a polypropylene reticular tearing film, and for the cable with the pressure-resistant requirement, the reticular structure has good flexibility, light weight, high tensile strength and good insulating property, and is not easy to twist when being processed into a cable.

The wrapping layer is a polyethylene tape which has good low-temperature resistance, good chemical stability and excellent electrical insulation performance. The polyethylene belt can adopt an applicable covering rate according to different cable sections, and the minimum covering rate is not less than 15% in order to ensure the tightness and roundness of the cable core.

The outer sheath is made of environment-friendly low-temperature-resistant soft polyethylene sheath material, so that the cold resistance of the polyethylene is further improved.

Through the design of each structure of the cable, original adverse factors of each structure are complemented, so that the overall mechanical and electrical properties of the cable can meet the requirements of low-temperature laying, production and use of the cable with the voltage level of 0.6/1 kV.

Drawings

The invention is further described with reference to the following figures and examples.

Fig. 1 is a schematic structural diagram of the present embodiment.

In the figure: conductor 1, insulating layer 2, packing 3, around covering 4, oversheath 5.

Detailed Description

The technical scheme is further explained by combining the drawings and the detailed implementation mode as follows:

as shown in fig. 1: the application range of the power cable is the rated voltage 0.6/1kV voltage class power cable.

An environment-friendly low-temperature laid power cable, which is applicable to rated voltage class of 0.6/1 kV. The structure of the power cable is as follows:

the cable is formed by a plurality of (3 in this example) wire cores and filling and twisting, and the cable core is sequentially wrapped by a wrapping layer 4 and an outer sheath 5; the stranding pitch diameter ratio range of the cable core is 30-40 times;

the wire core is formed by wrapping an insulating layer 2 outside a conductor 1, and the filling 3 is filled with an environment-friendly non-hygroscopic material;

the cross-sectional area of the conductor 1 is 1.5-400 mm²The conductor 1 is formed by twisting a plurality of copper monofilaments, the twisting pitch diameter ratio ranges from 10 to 25 times, and the outer diameter range of the copper monofilaments is 0.23 to 3.33 mm;

the thickness range of the insulating layer 2 is 0.7-2.0 mm; the insulating material for forming the insulating layer is an environment-friendly irradiation cross-linked polyethylene insulating material. Compared with the conventional silane crosslinking, the radiation crosslinking adopted by the insulating material does not contact water, the crosslinked polyethylene material keeps the original insulating characteristic of polyethylene, the insulation resistance is increased, and the insulating material is insensitive to temperature change.

The wrapping layer 4 is formed by wrapping an environment-friendly non-hygroscopic wrapping tape; the outer sheath 5 is made of an environment-friendly polyethylene sheath material, and the thickness range of the outer sheath 5 is 1.8-3 mm.

Specifically, in the present example, the voltage endurance requirement of the 3-core cable of the present example is 3.5kV/5min, then:

the outer diameter of the cable is 27.2 mm;

the stranding pitch diameter ratio of the cable core is 25 times;

the outer diameter of the conductor is 8.2mm, and the cross section area is 50mm²；

The pitch diameter ratio of the stranding of a plurality of copper monofilaments is 15 times;

the thickness value of the insulating layer is 1.0 mm;

the thickness value of the outer sheath is 1.8 mm;

the filling is polypropylene net tearing thin filling rope.

The environment-friendly non-hygroscopic wrapping tape is a polyethylene tape, and the minimum wrapping and covering rate of the wrapping tape is not less than 15%; the width of the lapping overlapping part is not less than 5 mm. When the wrapping is carried out, the tension of the belt is uniformly adjusted, and the wrapping is complete, compact and flat without folds. Common width specifications for polyethylene tapes are 0.4mm, 0.5mm, 0.6mm, selected according to the specific cable model specification.

In this example, if the tape width of 0.4mm or less is selected, the productivity is lowered, and if the tape width of 0.6mm or more is selected, wrinkles are likely to be generated during high-speed lapping, and the lapping quality is lowered. The production proves that the polyethylene belt with the belt width of 0.5mm is most suitable for the embodiment.

In this example, the outer sheath material is a Jiangsu Xinde environment-friendly low-temperature-resistant soft polyethylene sheath material.

The detection parameters of the environment-friendly low-temperature laying power cable of the embodiment are as follows:

1. original continued mechanical properties: tensile strength of not less than 15N/mm²(required value 12.5N/mm)²) Elongation at break of 420% or more (required value of 300%).

2. Low temperature performance test (-20 ℃, 2 ℃), no crack (no crack is required).

3. Mechanical properties after air oven aging: elongation at break, 380% (required 300%).

4. The insulation of the 3.5kV/5min alternating current withstand voltage test is not broken down.

5. Conductor direct current resistance at 20 ℃: 0.380 omega/km.

6. Insulation resistance at 20 ℃: 430M omega/km.

Claims

1. The utility model provides an environment-friendly low temperature lays power cable, the rated voltage class of cable is 0.6/1kV, characterized by the structure of cable is: the outer diameter range of the cable is 16-45 mm;

the filling is made of environment-friendly non-hygroscopic material;

2. The environmentally friendly low temperature cabling power cable of claim 1, wherein the filler material is polypropylene mesh tear-open thin filler rope.

3. The environmentally friendly low temperature cabling power cable of claim 1, wherein the environmentally friendly non-hygroscopic wrapping tape is a polyethylene tape having a width of 0.4mm, 0.5mm or 0.6 mm.

4. The environment-friendly low-temperature laid power cable as claimed in claim 1, wherein the withstand voltage requirement of the cable is 3.5kV/5min, the number of the wire cores is 3, and the outer diameter of the cable is 27.2 mm.

5. The environmentally friendly low temperature laid power cable of claim 4, wherein the cable core has a lay ratio of 25 times.

6. The environmentally friendly low-temperature-laid power cable as claimed in claim 4, wherein the cross-sectional area of the conductor is 50mm²The outer diameter is 8.2mm, and the pitch-diameter ratio of the twisted copper monofilaments is 15 times; the thickness of the insulating layer was 1.0 mm.

7. The environmentally friendly low temperature cabling power cable of claim 4, wherein the environmentally friendly non-hygroscopic wrapping tape is a polyethylene tape having a width of 0.5 mm.

8. An environmentally friendly low temperature laid power cable as claimed in claim 4, wherein the outer sheath has a thickness of 1.8 mm.