35kV ultralow-temperature cold-resistant power cable

Abstract

The utility model discloses a 35kV ultralow-temperature cold-resistant power cable, which comprises a conductor, three co-extrusion insulating layers are wrapped outside the conductor, a copper belt and a polyester belt are sequentially wrapped outside the three co-extrusion insulating layers, a halogen-free low-smoke environment-friendly cold-resistant polyolefin protective layer is extruded to form a wire core, and the three wire cores are twisted into a cable. A first glass fiber tape is sequentially wrapped outside the cable core, a halogen-free low-smoke environment-friendly cold-resistant polyolefin inner protective layer is extruded on the outer side of the first glass fiber tape, a steel wire armor layer is adopted for armoring, a second glass fiber tape is wrapped outside the steel wire armor layer, and an outer protective sleeve is wrapped on the outer side of the second glass fiber tape. According to the utility model, all materials forming the cable have the halogen-free, low-smoke, flame-retardant and environment-friendly characteristics while the cold-resistant requirement is met, so that the safety of the cable is greatly improved, and the cable has excellent cold resistance and low-temperature toughness and can be used for a long time in high and cold, dry, windy and strong ultraviolet environments.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, in particular to a 35kV ultra-low temperature cold-resistant power cable. Background Art

[0002] In winter in northern my country, there is ice and snow everywhere, and the temperature is extremely low. 35kV power cables are generally laid outdoors, in tunnels and pipelines, and are easily affected by external low temperature weather. The outer sheath of the cable is easily frozen and hardened and brittle. In severe cases, cracks occur, the cable is damaged, and power transmission is disrupted, causing large-scale power outages, which has a great impact on industrial production and people's quality of life. In such an environment, cold-resistant cables or antifreeze cables are needed. In order to meet the current market demand, our company has designed and developed a 35kV ultra-low temperature cold-resistant power cable. Utility Model Content

[0003] The utility model aims to remedy the defects of the prior art and provide a 35kV ultra-low temperature cold-resistant power cable.

[0004] The utility model is realized by the following technical solutions:

[0005] A 35kV ultra-low temperature cold-resistant power cable comprises a conductor, a three-layer co-extruded insulation layer is coated on the outside of the conductor, a copper tape and a polyester tape are sequentially wrapped outside the three-layer co-extruded insulation layer, and a halogen-free, low-smoke, environmentally friendly and cold-resistant polyolefin sheath is extruded to form a wire core, the three wire cores are twisted into a cable, a glass fiber tape one is sequentially coated on the outside of the cable core, a halogen-free, low-smoke, environmentally friendly and cold-resistant polyolefin inner sheath is extruded on the outside of the glass fiber tape one, and a steel wire armor layer is used for armoring, a glass fiber tape two is wrapped outside the steel wire armor layer, and an outer sheath is coated on the outside of the glass fiber tape two.

[0006] The three-layer co-extruded insulating layer comprises, from the inside to the outside, an inner semi-conductive shielding layer, a cross-linked polyethylene insulating layer and an outer semi-conductive shielding layer.

[0007] The conductor is a copper conductor.

[0008] When the cable is made, the cable core is filled with polypropylene flame retardant filling rope.

[0009] The outer sheath is made of PUR polyurethane.

[0010] The advantages of the utility model are: the utility model has excellent cold resistance, can be normally installed and used under cold conditions in winter, and even under ultra-low temperature conditions, the cable sheath still has good physical, mechanical, electrical and aging resistance properties and will not crack even if it is subjected to external forces. While meeting the cold resistance requirements, all materials constituting the cable have the characteristics of halogen-free, low-smoke, flame-retardant and environmentally friendly, which greatly improves the safety of the cable, has excellent cold resistance and low-temperature toughness, and can be used for a long time in high-cold, dry, windy and strong ultraviolet environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of the utility model. DETAILED DESCRIPTION

[0012] like Figure 1 As shown, a 35kV ultra-low temperature cold-resistant power cable includes a conductor 1, and the conductor 1 is a copper conductor. The outer side of the conductor 1 is coated with three layers of co-extruded insulation layers, and the three layers of co-extruded insulation layers include an inner semi-conductive shielding layer 2, a cross-linked polyethylene insulation layer 3 and an outer semi-conductive shielding layer 4 from the inside to the outside. Copper tape 5 and polyester tape 6 are wrapped in turn outside the three layers of co-extruded insulation layers, and then a halogen-free, low-smoke, environmentally friendly and cold-resistant polyolefin sheath 7 is extruded to form a wire core. The three wire cores are twisted into a cable. When the cable is formed, the inside of the cable core is filled with a polypropylene flame-retardant filling rope 8 to ensure the roundness of the cable. Glass fiber tape 1 9 is coated in turn outside the cable core, and a halogen-free, low-smoke, environmentally friendly and cold-resistant polyolefin inner sheath 10 is extruded outside the glass fiber tape 1 9, and a steel wire armor layer 11 is used for armoring. A glass fiber tape 2 12 is wrapped outside the steel wire armor layer, and a PUR polyurethane outer sheath 13 is coated outside the glass fiber tape 2 12.

[0013] The 35kV ultra-low temperature cold-resistant power cable provided by the utility model is different from conventional cables in design and material selection to ensure stable and reliable power transmission under low temperature conditions. The product has the characteristics of cold resistance, wear resistance, oil resistance, radiation resistance, etc., and can withstand low temperatures of minus 60℃. It has good bending properties in extremely cold environments, the sheath does not crack, and the product performance is stable. It is suitable for power transmission and distribution lines with a rated voltage of 35kV and below under low temperature conditions and in northern high-cold areas. Its cold resistance performance still maintains good flexibility under certain low temperature conditions to maintain the normal operation of the cable.

[0014] The cable uses a copper core stranded conductor. The inner semi-conductive shielding layer 2, the cross-linked polyethylene insulation layer 3 and the outer semi-conductive shielding layer 4 are extruded simultaneously by a 35kV three-layer co-extrusion dry cross-linking production line. The outer insulation layer is wrapped with a copper tape 5. In order to prevent the copper tape from being oxidized and affecting its performance due to humidity in a severe cold environment, a layer of polyester tape 6 is wrapped around its outer layer, and then a halogen-free, low-smoke, environmentally friendly and cold-resistant polyolefin sheath 7 is extruded. The sheath material is soft and has good physical and mechanical properties, anti-aging, high strength, weather resistance, wear resistance and other properties, which can form a good protective effect on the inner layer material. The three cores are twisted into a cable. When the cable is formed, the polypropylene flame-retardant filling rope is used to fill the roundness, and the glass fiber tape is wrapped to tighten. The polypropylene flame-retardant filling rope and the glass fiber tape are both non-hygroscopic materials, which can effectively prevent the intrusion of external humid air, and have good thermal insulation and heat insulation properties, and have excellent flame retardant properties. The outer sheath is extruded with a halogen-free, low-smoke, environmentally friendly, cold-resistant polyolefin inner sheath and wrapped with steel wire armor. Compared with steel tape armor, steel wire armor has better flexibility and greater bending degree, and is not easy to cause damage to the inner and outer materials. The outer sheath is made of PUR polyurethane material. The glass fiber tape is placed between the armor layer and the sheath to avoid direct contact between the armor layer and the sheath, reducing the risk of sheath damage. The sheath material PUR polyurethane is not easy to age and harden like PVC due to various environmental factors, nor will it age and stress crack like PE, resulting in reduced electrical performance and environmental resistance of the cable. At a low temperature of -60℃, it can still maintain good bending performance, and will not crack even if it is bent multiple times with a very small bending radius. This product has excellent cold resistance and can be installed and used normally under cold conditions in winter. Even under ultra-low temperature conditions, even if it is subjected to external forces, the cable sheath still has good physical, mechanical, electrical and aging resistance and will not crack. While meeting the cold-resistance requirements, all materials making up the cable are halogen-free, low-smoke, flame-retardant and environmentally friendly, greatly improving the safety and service life of the cable.

Claims

1. A 35kV ultra-low temperature cold-resistant power cable, characterized in that: It comprises a conductor, a three-layer co-extruded insulation layer is coated on the outside of the conductor, a copper tape and a polyester tape are sequentially wrapped outside the three-layer co-extruded insulation layer, and a halogen-free, low-smoke, environmentally friendly and cold-resistant polyolefin sheath is extruded to form a wire core, the three wire cores are twisted into a cable, a glass fiber tape one is sequentially coated on the outside of the cable core, a halogen-free, low-smoke, environmentally friendly and cold-resistant polyolefin inner sheath is extruded on the outside of the glass fiber tape one, and a steel wire armor layer is used for armoring, a glass fiber tape two is wrapped outside the steel wire armor layer, and an outer sheath is coated on the outside of the glass fiber tape two.

2. A 35kV ultra-low temperature cold-resistant power cable according to claim 1, characterized in that: The three-layer co-extruded insulating layer comprises, from the inside to the outside, an inner semi-conductive shielding layer, a cross-linked polyethylene insulating layer and an outer semi-conductive shielding layer.

3. A 35kV ultra-low temperature cold-resistant power cable according to claim 1, characterized in that: The conductor is a copper conductor.

4. A 35kV ultra-low temperature cold-resistant power cable according to claim 1, characterized in that: When the cable is made, the cable core is filled with polypropylene flame retardant filling rope.

5. The 35kV ultra-low temperature cold-resistant power cable according to claim 1, characterized in that: The outer sheath is made of PUR polyurethane.

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