CN223362865U - A high-insulation power cable - Google Patents

Abstract

The present invention relates to the technical field of cables and discloses a high-insulation power cable, comprising a cable body, the cable body comprising a group of conductor cores disposed at a central position within the cable body, the outer periphery of the group of conductor cores being wrapped with a conductor inner shield, an insulating layer being fixedly sleeved on the outer side of the conductor inner shield, an insulating outer shield being fixedly sleeved on the outer side of the insulating layer, and a wrapping tape being fixedly sleeved on the outer side of the insulating outer shield. The present invention adopts a multi-layer insulation structure, i.e., a multi-layer insulation structure design, i.e., an inner shield, an insulating layer, and an outer shield. For high-voltage power cables, the multi-layer insulation structure design can effectively improve the insulation performance of the cable, reduce the electric field strength, and reduce the occurrence of partial discharge, compared to single-layer or double-layer insulation structure designs.

Description

High-insulativity power cable

Technical Field

The utility model relates to the technical field of cables, in particular to a high-insulativity power cable.

Background

The power cable is used for transmitting and distributing electric energy, the inner center position of the power cable is a conductor, the conductor is a core part of the power cable and is usually made of metal materials with good conductivity such as copper or aluminum, and an insulating layer is arranged outside the conductor and used for isolating the conductor from electrical contact with the outside, so that safe transmission of current in the conductor is ensured.

The existing power cable has the following problems that an insulating layer is arranged on the outer side of a wire core of the existing power cable generally, a layer of shielding is arranged on the outer layer of the cable to perform insulation treatment on the whole power cable, the single-layer or double-layer insulating structure design of the existing power cable is only suitable for medium-low voltage power cables, and the existing power cable cannot well reduce the electric field strength and reduce the occurrence of partial discharge for high-voltage power cables.

Disclosure of utility model

(One) solving the technical problems

Aiming at the defects of the prior art, the utility model provides a power cable with high insulativity, and solves the problems proposed by the background technology.

(II) technical scheme

In order to achieve the purpose, the high-insulativity power cable comprises a cable main body, wherein the cable main body comprises a group of conductor cores arranged at the central position in the cable main body, the periphery of one group of conductor cores is wrapped with a conductor inner shield, an insulating layer is fixedly sleeved on the outer side of the conductor inner shield, an insulating outer shield is fixedly sleeved on the outer side of the insulating layer, a wrapping belt is fixedly sleeved on the outer side of the insulating outer shield, and a metal outer shield is fixedly sleeved on the outer side of the wrapping belt.

As a still further scheme of the utility model, the outer side of the cable main body is provided with a composite armor, the composite armor comprises an outer polypropylene fiber layer arranged at the outermost side of the cable main body, the inner wall of the outer polypropylene fiber layer is in an annular equal-angle shape and fixedly connected with a plurality of aluminum magnesium alloy armor strips, and the inner walls of the aluminum magnesium alloy armor strips are fixedly connected with the same polypropylene fiber layer.

As a still further scheme of the utility model, the outer side of the metal outer shield is fixedly sleeved with a water-blocking cushion layer, the outer side of the water-blocking cushion layer is fixedly sleeved with a polyethylene sheath, and the outer side of the polyethylene sheath is fixedly sleeved with a polypropylene fiber layer.

As a still further scheme of the utility model, one group of conductor wire cores are arranged concentrically from inside to outside, the conductor wire cores are made of pure copper, the center position of one group of conductor wire cores is one conductor wire core, the secondary outer layers of one group of conductor wire cores are six conductor wire cores arranged at equal angles, and the outermost layers of one group of conductor wire cores are twelve conductor wire cores arranged at equal angles.

Compared with the prior art, the utility model has the beneficial effects that:

1. In the utility model, by adopting a multi-layer insulation structure and adopting a multi-layer insulation structure design, namely an inner shielding, an insulation layer and an outer shielding are arranged, compared with a single-layer or double-layer insulation structure design, the multi-layer insulation structure design of the power cable with high voltage level can effectively improve the insulation performance of the cable, reduce the electric field intensity and reduce the occurrence of partial discharge.

2. In the utility model, the composite armor is arranged outside the power cable, so that the mechanical protection effect of the outside of the power cable is realized, the external force resistance of the cable is enhanced, and the composite armor can effectively protect the structures such as conductors, insulating layers and shielding layers in the cable and prevent the structures from being mechanically damaged due to the external force effects such as stretching, extrusion and bending in the cable laying process, for example, the composite armor can prevent stones, hard objects and the like in soil from extruding and puncturing the power cable when the cable is laid underground.

Drawings

FIG. 1 is a cross-sectional view of a cable of the present utility model;

FIG. 2 is an enlarged view of the utility model at A in FIG. 1;

fig. 3 is an enlarged view of the present utility model at B in fig. 1.

In the figure, 1, a cable main body, 11, a conductor core, 12, an inner conductor shield, 13, an insulating layer, 14, an outer insulating shield, 15, a belting, 16, an outer metal shield, 17, a water-blocking cushion layer, 18, a polyethylene sheath, 19, a polypropylene fiber layer, 110, an aluminum-magnesium alloy armor strip and 111, and an outer polypropylene fiber layer.

Detailed Description

Embodiments of the present utility model are described in further detail below with reference to the accompanying drawings and examples. The following examples are illustrative of the utility model but are not intended to limit the scope of the utility model.

In the description of the present utility model, unless otherwise indicated, the meaning of "plurality" is two or more, and the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus are not to be construed as limiting the present utility model. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected" and "connected" are to be construed broadly, and for example, they may be fixedly connected, detachably connected, or integrally connected, mechanically connected, electrically connected, or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

Referring to fig. 1 to 3, in the embodiment of the present utility model, a power cable with high insulation performance includes a cable main body 1, the cable main body 1 includes a group of conductor cores 11 disposed at a central position in the cable main body 1, a group of conductor cores 11 are wrapped with an inner conductor shield 12, an insulating layer 13 is fixedly sleeved outside the inner conductor shield 12, an outer insulating shield 14 is fixedly sleeved outside the insulating layer 13, a wrapping tape 15 is fixedly sleeved outside the outer insulating shield 14, an outer metal shield 16 is fixedly sleeved outside the wrapping tape 15, and a multi-layer insulation structure is integrally adopted.

The cable main part 1 outside is provided with compound armor, compound armor is including setting up the outer polypropylene fiber layer 111 of cable main part 1 outside, outer polypropylene fiber layer 111 inner wall is many almag armor 110 of annular equiangular form fixedly connected with, many almag armor 110 inner wall fixedly connected with is same cohesion propylene fiber layer 19, whole power cable is provided with compound armor in the power cable outside, play the mechanical protection in the power cable outside, strengthen the exogenic power of cable, because in the cable laying process, can receive tensile, extrusion, crooked external force effect such as, its compound armor can protect cable inside conductor effectively, insulating layer 13 and shielding layer isotructure, prevent that it from receiving mechanical damage, for example, when underground cabling, compound armor can prevent that stone in the soil, hard thing etc. from causing extrusion and puncture to the power cable.

The outer side of the metal outer shield 16 is fixedly sleeved with a water-blocking cushion layer 17, the outer side of the water-blocking cushion layer 17 is fixedly sleeved with a polyethylene sheath 18, the outer side of the polyethylene sheath 18 is fixedly sleeved with a polypropylene fiber layer 19, and the polyethylene sheath 18 has good corrosion resistance, mechanical property and flame retardant property and is low in price and is a common sheath material in power cables.

The conductor wire cores 11 are arranged concentrically from inside to outside, the conductor wire cores 11 are made of pure copper, the center position of the conductor wire cores 11 is provided with one conductor wire core 11, the outer layers of the conductor wire cores 11 are six conductor wire cores 11 arranged at equal angles, the outermost layers of the conductor wire cores 11 are twelve conductor wire cores 11 arranged at equal angles, the arrangement structure design of the conductor wire cores 11 can reduce the influence of skin effect, for alternating current, the current is mainly concentrated on the surface of a conductor due to the skin effect, in the multi-wire core structure, the sectional area of each wire core is relatively smaller, so that the current is distributed more uniformly in each wire core, the influence of the skin effect is reduced, the conductive efficiency of the cable is improved, and the electric energy loss is reduced.

The utility model has the working principle that the power transmission can be carried out through the plurality of conductor cores 11, the skin effect influence can be reduced by the arrangement structure design of the plurality of conductor cores 11, and for alternating current, the current is mainly concentrated on the surface of a conductor due to the skin effect, and in the multi-wire core structure, the sectional area of each wire core is relatively smaller, so that the current is distributed more uniformly in each wire core, and the influence of the skin effect is reduced. This helps improving the conductive efficiency of cable, reduce the electric energy loss, and wholly adopt multilayer insulation structure, adopt multilayer insulation structure design, be provided with the inner shield promptly, insulating layer 13 and outer shielding, for the power cable of high voltage class, its multilayer insulation structure design is compared in single-layer or double-deck insulation structure design, can improve the insulating properties of cable effectively, reduce electric field strength, reduce partial discharge's emergence, wherein the inner shield is mainly used for the electric field on even conductor surface, reduce partial discharge's emergence, and outer shielding mainly used is the interference of reduction external electromagnetic field to the cable, simultaneously also can prevent the inside electric field of cable from outwards radiating, in addition, whole power cable is provided with composite armor in the power cable outside, play the mechanical protection effect in the power cable outside, the external force resistance of reinforcing cable, because in cable laying process, can receive tensile, extrusion, crooked equiangular structure such as cable, it receives mechanical damage effectively, for example, in the underground cable can be prevented to the cable in the composite armor can prevent that cable inside conductor, hard thing from causing cable and extrusion.

It should be noted that, the inner shield is a conductor inner shield 12, which is made of semiconductive polyolefin, is made of polyethylene, polypropylene and other polyolefin as base materials, and is made by adding conductive filler (such as carbon black), so that the inner shield has good semiconductive performance and is commonly used for high-voltage and ultra-high-voltage power cables.

It should be noted that, the outer shielding is an insulating outer shielding 14 and a metal outer shielding 16, the insulating outer shielding 14 is made of semiconductive polyolefin, and is made of polyolefin resin and conductive carbon black and other fillers, so that the insulating outer shielding has good semiconductive performance, can effectively and uniformly electric field, reduces local discharge risk, is widely applied to the outer shielding layer of the medium-high voltage power cable, and the metal outer shielding 16 is a steel wire woven net and is woven by thin steel wires, so that the insulating outer shielding has good flexibility and elasticity, and has good shielding effect and can effectively block high-frequency electromagnetic field interference.

The insulating layer 13 is made of glass fiber, has excellent high temperature resistance, can be used for a long time in a high temperature environment, has good electrical insulation performance and mechanical strength, and has a certain resistance to chemical corrosion.

The foregoing is only a preferred embodiment of the present utility model, but the scope of the present utility model is not limited thereto, and any person skilled in the art, who is within the scope of the present utility model, should make equivalent substitutions or modifications according to the technical scheme of the present utility model and the inventive concept thereof, and should be covered by the scope of the present utility model.

Claims (7)

1. A high insulation power cable comprising a cable body (1), the cable body (1) comprising a set of conductor cores (11) arranged in a central position within the cable body (1);

the cable is characterized in that the periphery of a group of conductor cores (11) is wrapped with a conductor inner shield (12), and an insulating layer (13) is fixedly sleeved on the outer side of the conductor inner shield (12);

An insulating outer shield (14) is fixedly sleeved on the outer side of the insulating layer (13), a wrapping belt (15) is fixedly sleeved on the outer side of the insulating outer shield (14), and a metal outer shield (16) is fixedly sleeved on the outer side of the wrapping belt (15);

The outer side of the cable main body (1) is provided with a composite armor;

The composite armor comprises an outer polypropylene fiber layer (111) arranged at the outermost side of a cable main body (1), wherein a plurality of aluminum magnesium alloy armor strips (110) are fixedly connected to the inner wall of the outer polypropylene fiber layer (111) in an annular equal-angle mode, and a plurality of same polypropylene fiber layers (19) are fixedly connected to the inner wall of each aluminum magnesium alloy armor strip (110).

2. A highly insulated power cable according to claim 1, wherein a water-blocking cushion layer (17) is fixedly sleeved outside the metal outer shield (16).

3. A high insulation power cable according to claim 2, wherein a polyethylene sheath (18) is fixedly sleeved outside the water-blocking cushion layer (17).

4. A high insulation power cable according to claim 3, wherein the outer side of the polyethylene sheath (18) is fixedly sleeved with a layer (19) of polypropylene fibers.

5. The high-insulation power cable according to claim 1, wherein one group of the conductor cores (11) is arranged concentrically with three layers from inside to outside, and the conductor cores (11) are made of pure copper.

6. A high insulation power cable according to claim 1, wherein the central position of a group of the conductor cores (11) is a conductor core (11).

7. The high-insulation power cable according to claim 1, wherein the outer layers of one group of the conductor cores (11) are six conductor cores (11) arranged at equal angles, and the outermost layers of one group of the conductor cores (11) are twelve conductor cores (11) arranged at equal angles.