CN210722554U

CN210722554U - Medium voltage power cable

Info

Publication number: CN210722554U
Application number: CN201920969755.0U
Authority: CN
Inventors: 杨怀; 叶恺; 鞠霖; 周瑾; 刘军
Original assignee: Wuxi Huaneng Electric Cable Co ltd
Current assignee: Wuxi Huaneng Electric Cable Co ltd
Priority date: 2019-06-25
Filing date: 2019-06-25
Publication date: 2020-06-09
Anticipated expiration: 2029-06-25

Abstract

The utility model belongs to the technical field of wire and cable equipment, and relates to a medium-voltage power cable, which comprises three core structures, wherein the three core structures are coaxially arranged, the outer sides of the three core structures are sequentially provided with tape insulation, the tape insulation outer surface is laminated with an armor layer, the armor layer outer surface is laminated with a sheath, and a filler is filled in a gap between the three core structure outer surface and the tape insulation inner wall; every the core structure all includes the electrically conductive core of inlayer, the laminating of the outside of electrically conductive core sets up first semi-conductive conductor shielding layer, and the surface cladding of first shielding layer sets up insulating inlayer, the surface cladding of insulating inlayer is insulating outer. The product of the utility model is simple in structure, reasonable ingenious, when using, have stable performance, production and realize easily, to equipment and capital construction characteristics that the investment is low.

Description

Medium voltage power cable

Technical Field

The utility model belongs to the technical field of wire and cable equipment, a middling pressure power cable is related to.

Background

With the rapid development of economy and the continuous improvement of living standard of people in China, the electricity load presents a new trend of rapid increase, large change and diversification. The power distribution system directly faces to the power consumers, bears the power supply service of the power consumers, is an important infrastructure for improving the livelihood and guaranteeing the development of the economy and the society, and has urgent tasks of accelerating the construction and transformation and upgrading of the power distribution network.

The power distribution grid is expanded from the voltage level of 10 (20) kV to 35kV, and the requirement on the continuity of the power demand is higher; meanwhile, in order to meet the requirements of urban modern construction and urban appearance beautification, the installation of overhead lines in the ground becomes a trend. At present, a 10-20 kV power cable is mainly produced by catenary dry chemical crosslinking, and the dry chemical crosslinking needs a special factory building, and has the advantages of large investment, low thermal efficiency and complex process control. The ultraviolet crosslinking and silane method has simple process, high production speed and small investment, but the one-step forming process is difficult to meet the technical requirement of power cable insulation of 10-35 kV voltage class.

Disclosure of Invention

The utility model provides a to above-mentioned problem, provide a middling pressure power cable, this cable is applicable to the power transmission of the transmission line of 10~35 kV voltage class.

According to the technical scheme of the utility model: a medium voltage power cable characterized by: the protective structure comprises a protective structure and a core structure arranged in the protective structure; the core structure comprises a conductive core body, wherein a first shielding layer is attached to the outer surface of the conductive core body, an insulating inner layer is coated on the outer surface of the first shielding layer, an insulating outer layer is coated on the outer surface of the insulating inner layer, a second shielding layer is coated on the outer surface of the insulating outer layer, and a metal shielding layer is coated on the outer surface of the second shielding layer; the protective structure comprises a belt insulation layer, an armor layer and a sheath which are sequentially arranged from inside to outside.

As a further improvement, the protection structure is internally provided with a group of core structures and is provided with an insulating coating on the surface of the metal shielding layer.

As a further improvement, set up three group's core structures in the protective structure, it has the stopping to fill between three group's core structure's surface and protective structure's the inner wall.

As a further improvement of the utility model, the weight percentage of the gel of the insulating inner layer is more than 65 percent.

As a further improvement of the utility model, the weight percentage of the gel of the insulating outer layer is more than 75%.

As a further improvement, the insulating inner layer is made of ultraviolet irradiation crosslinked polyethylene material, and the insulating outer layer is made of silane crosslinked polyethylene.

As a further improvement of the utility model, the metal shielding layer is an aluminum sleeve or a copper strip.

As a further improvement of the utility model, the sum of the thickness of the insulating inner layer and the insulating outer layer is 4.5-10.0 mm.

The technical effects of the utility model reside in that: the product of the utility model is simple in structure, reasonable ingenious, when using, have stable performance, production and realize easily, to equipment and capital construction characteristics that the investment is low.

Drawings

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

Fig. 2 is a schematic structural diagram of a second embodiment of the present invention.

Fig. 3 is a schematic structural diagram of a third embodiment of the present invention.

Detailed Description

The following description will further describe embodiments of the present invention with reference to the accompanying drawings.

In fig. 1 to 3, the cable includes a conductive core 1, a first shielding layer 2, an insulating inner layer 3, an insulating outer layer 4, a second shielding layer 5, a metal shielding layer 6, a tape insulation 7, an armor layer 8, a sheath 9, a filler 10, and the like.

As shown in fig. 1 to 3, the utility model relates to a medium voltage power cable, which comprises a protective structure and a core structure arranged in the protective structure; the core structure comprises a conductive core 1, wherein a first shielding layer 2 is attached to the outer surface of the conductive core 1, an insulating inner layer 3 is coated on the outer surface of the first shielding layer 2, an insulating outer layer 4 is coated on the outer surface of the insulating inner layer 3, a second shielding layer 5 is coated on the outer surface of the insulating outer layer 4, and a metal shielding layer 6 is coated on the outer surface of the second shielding layer 5; the protective structure comprises a belt insulation layer 7, an armor layer 8 and a sheath 9 which are sequentially arranged from inside to outside.

As shown in fig. 1, a set of core structures is arranged in the protective structure, and the tape insulation 7 is coated on the surface of the metal shielding layer 6.

As shown in fig. 2 and 3, three sets of core structures are disposed in the protective structure, and a filling material 10 is filled between outer surfaces of the three sets of core structures and an inner wall of the protective structure. The cross-section of the core structure in the structure shown in fig. 2 is cylindrical, and the cross-section of the core structure in the structure shown in fig. 3 is an irregular shape formed by a plurality of circular arcs.

The insulating inner layer 3 has a gel weight percentage of more than 65%.

The gel weight percentage of the insulating outer layer 4 is greater than 75%.

The insulating inner layer 3 is made of ultraviolet irradiation crosslinking polyethylene material, and the insulating outer layer 4 is made of silane crosslinking polyethylene.

The metal shielding layer 6 is an aluminum sleeve or a copper strip.

The sum of the thicknesses of the insulating inner layer 3 and the insulating outer layer 4 is 4.5-10.0 mm.

As shown in FIGS. 1-3, the utility model discloses two kinds of embodiments of product, the cross-section of core structure is cylindric in the first embodiment, and the cross-section of core structure is irregularly shaped in the embodiment in the second, specifically can carry out corresponding setting according to in service behavior.

The utility model discloses the concrete production process of product as follows: the conductive core body 1 is coated with a first shielding layer 2 on the outer surface of the conductive core body 1 through a pay-off rack, a wire storage device, a rear traction machine and a shielding layer extruding machine; the conductor coating the first shielding layer 2 is coated with an insulating inner layer 3 outside the first shielding layer 2 through an insulating inner layer 3 plastic extruding machine, and the material coating the insulating inner layer 3 is ultraviolet irradiation crosslinking polyethylene material; the cable core coated with the insulating inner layer 3 is illuminated by an ultraviolet irradiator, so that the gel content of the insulating inner layer 3 reaches more than 65 percent; irradiating the cable core coated with the insulating inner layer 3 and then immediately coating the insulating outer layer 4; the insulating outer layer 4 is made of composite silane polyethylene material added with catalyst, antioxidant, silane and the like; and (3) crosslinking the coated insulating outer layer 4 in warm water or steam to enable the gel content of the insulating outer layer 4 to reach over 75 percent. Winding a second shielding layer 5 on the insulating outer layer 4 for metal shielding; stranding the three-core cable into a cable, and filling the gap of the cable with filler 10; and (4) sheathing after winding the insulating tape, and finally coating the sheath.

Claims

1. A medium voltage power cable characterized by: the protective structure comprises a protective structure and a core structure arranged in the protective structure; the core body structure comprises a conductive core body (1), wherein a first shielding layer (2) is attached to the outer surface of the conductive core body (1), an insulating inner layer (3) is coated on the outer surface of the first shielding layer (2), an insulating outer layer (4) is coated on the outer surface of the insulating inner layer (3), a second shielding layer (5) is coated on the outer surface of the insulating outer layer (4), and a metal shielding layer (6) is coated on the outer surface of the second shielding layer (5); the protective structure comprises a belt insulator (7), an armor layer (8) and a sheath (9) which are sequentially arranged from inside to outside.

2. The medium voltage power cable according to claim 1, characterized in that: a group of core body structures are arranged in the protection structure, and the surface of the metal shielding layer (6) is coated with the tape insulation (7).

3. The medium voltage power cable according to claim 1, characterized in that: three groups of core structures are arranged in the protective structure, and filling materials (10) are filled between the outer surfaces of the three groups of core structures and the inner wall of the protective structure.

4. The medium voltage power cable according to claim 1, characterized in that: the insulating inner layer (3) is made of ultraviolet irradiation crosslinking polyethylene materials, and the insulating outer layer (4) is made of silane crosslinking polyethylene.

5. The medium voltage power cable according to claim 1, characterized in that: the metal shielding layer (6) is an aluminum sleeve or a copper strip.

6. The medium voltage power cable according to claim 1, characterized in that: the sum of the thicknesses of the insulating inner layer (3) and the insulating outer layer (4) is 4.5-10.0 mm.