CN201408600Y - Self-supporting lightning protection power cable - Google Patents

Abstract

The utility model provides a self-supporting type lightning protection power cable, which comprises a cable core for transmitting electricity, a coating layer for coating the cable core, and a suspension wire connected with the coating layer; and the coating layer comprises a shielding layer used for shielding the cable core, an outer belting layer used for coating the shielding layer, an outer sheath used for coating the outer belting layer, and a ground plane arranged between the cable core and the shielding layer. The utility model adopts the scheme that the lightning-proof capability of the power cable is enhanced by arranging the ground plane, that is, when lightning stroke occurs, thunderstorm electricity entering the cable is instantaneously conducted into the ground through the ground plane, so as to ensure the security of the power cable and the base station equipment connected with the power cable.

Description

Self-supporting lightning protection power cable

technical field

The utility model relates to electric wire and cable technology, in particular to a self-supporting lightning protection power cable capable of lightning protection and used outdoors.

Background technique

Based on the base station construction sites are mostly open, highland or mountainous area, the terrain is complex and the working environment is harsh, the equipment of the base station is easily damaged by lightning weather, the outdoor cables of the base station, especially in the northern area where the temperature is low in winter and directly exposed to ultraviolet rays, are prone to damage. Aging and damage will affect the work of the base station. The cable used as a communication base station should have certain shielding and anti-interference performance to ensure that its own electromagnetic field does not interfere with other signals and is not interfered by the external electromagnetic field on the cable core.

In addition, because the cable may be struck by lightning, once a lightning strike occurs, it will cause serious losses to communication facilities.

Contents of the invention

The purpose of this utility model is to provide a self-supporting lightning protection power cable that can protect against lightning and is suitable for outdoor use.

In addition, the utility model also improves the strength of the cable by equipping the power cable with a reinforcing layer, so as to meet the special climate requirements required by the communication base station in the outdoor environment.

The self-supporting lightning protection power cable of the present utility model includes:

cable core for power transmission;

a coating covering the cable core; and

a suspension wire connecting the cladding;

Wherein, the coating layer includes:

shielding the shielding layer of the cable core;

an outer tape layer covering the shielding layer;

an outer sheath covering the outer tape layer;

A grounding layer disposed between the cable core and the shielding layer.

The utility model increases the anti-lightning strike ability of the power cable by setting the ground layer, that is, when a lightning strike occurs, the ground layer instantly guides the lightning entering the cable into the ground, thereby ensuring the safety of the power cable and the base station equipment connected to the power cable.

In addition, since the suspension wire is provided on the cable, it is more convenient to lay the cable, and the mechanical pulling resistance of the cable is improved, which ensures the communication safety of the equipment.

The grounding layer is configured such that bundled copper wires twisted by multiple strands of copper wires obliquely wrap the cable core, and the wrapping pitch is 18-28 times the outer diameter of the cable core.

The ground layer may also be configured as a metal layer and a metal mesh covering the cable core.

As an option, the grounding layer of the present utility model can also be a grounding outer conductor such as a single wire or a bundle of twisted copper wires twisted by multiple strands of copper wire, and the inner sheath is wrapped obliquely, and the wrapping pitch is the required 18 to 28 times the outer diameter of the cable core.

Wherein the shielding layer is formed by wrapping the outer conductor with a copper tape, and the wrapping overlap rate is above 25%.

Wherein the cable core includes: at least two insulated wire cores; an inner tape layer covering the insulated wire cores; and an inner sheath covering the inner tape layer.

Wherein the insulated wire cores include a conductor and an insulating layer covering the conductor, and the number of the insulated wire cores is 2-5.

In addition, a filler material is filled between the insulated wire cores to form a solid cable core and improve the compression resistance of the cable core.

Wherein the suspension wire includes: a steel cable for bearing; and a suspension wire jacket covering the steel cable; wherein the suspension wire jacket and the outer sheath are integrally structured.

Wherein the outer sheath is made of polyolefin material; the insulating layer is made of cross-linked polyolefin material; the inner sheath is made of flame-retardant polyolefin material; and the inner tape layer and outer tape are made of polyester material.

Wherein the conductor is formed by twisting multiple strands of copper wires, and the cross-sectional area of the conductor is the same as that of the grounding outer conductor.

Compared with the prior art, the outer conductor of the utility model is located between the cable core and the shielding layer, and is composed of multiple copper wires arranged obliquely, which effectively conducts instantaneous high voltage and prevents damage to communication equipment caused by lightning. In addition, there is a shielding layer of copper tape on the periphery of the outer conductor, which can effectively shield the electromagnetic field generated by the cable from interfering with signals of other communication cables, and improve the performance of the cable. The suspension wire structure makes the cable laying more convenient, and improves the mechanical pulling resistance of the cable, ensuring the communication safety of the equipment. The outer sheath adopts cold-resistant low-smoke and halogen-free polyolefin materials, which are low-smoke and halogen-free, environmentally friendly, and resistant to ultraviolet rays and cold. Therefore, the self-supporting lightning protection power cable of the utility model can meet the requirements of communication base stations in harsh environments. The workplace can work normally, its environmental adaptability is strong, and its mechanical performance is good.

Below in conjunction with accompanying drawing, the details of the present utility model are described in detail.

Description of drawings

Fig. 1 is a schematic diagram of the first embodiment of the self-supporting lightning protection power cable of the present invention;

Fig. 2 is a schematic diagram of a second embodiment of the self-supporting lightning protection power cable of the present invention.

Description of reference numerals: 1-insulated wire core; 11-conductor; 12-insulation layer; 2-filler; 3-inner tape layer; 4-grounding layer or outer conductor; 5-outer tape layer; 6-inner sheath ; 7-shielding layer; 8-outer sheath; 9-cable core; 10-suspension wire; 101-steel cable;

Detailed ways

The self-supporting lightning protection power cable of the utility model is a lightning protection power cable that can strengthen the cable strength.

Fig. 1 shows the first embodiment of the self-supporting lightning protection power cable of the present invention, and Fig. 2 shows the second embodiment of the self-supporting lightning protection power cable of the present invention. In the first embodiment, the self-supporting lightning protection power cable has two insulated wire cores 1 . In the second embodiment, the self-supporting lightning protection power cable has three insulated wire cores 1 .

In a nutshell, the self-supporting lightning protection power cable of the present invention includes:

a cable core 9 for transmitting power and a coating covering said cable core 9; and

a suspension wire 10 connecting the cladding;

Wherein, the coating layer includes:

Shielding the shielding layer 7 of the cable core 9;

An outer tape layer 5 covering the shielding layer 7;

An outer sheath 8 covering the outer tape layer 5;

as well as

The grounding layer 4 is arranged between the cable core 9 and the shielding layer 7 .

The ground layer 4 can be formed in various forms, for example, a metal layer is used to form the ground layer, or a metal mesh is used to form the ground layer.

The utility model preferably uses twisted copper wires to form the grounding layer, that is, the grounding layer 4 is configured as: twisted copper wires twisted by multiple strands of copper wires obliquely wrap the cable core 9, and its wrapping joints The distance is 18 to 28 times the outer diameter of the cable core.

A feature of the utility model is that a suspension wire 10 connected to the covering layer is provided so that the power cable can be erected with its own suspension wire, which can not only speed up the speed of assuming the power cable, but also save the cost of setting an independent suspension wire for carrying the power cable. Cost, but also can improve the mechanical pull resistance of the cable, so as to ensure the communication safety of the equipment.

As shown in Figure 1 or Figure 2, the suspension wire 10 includes: a steel cable 101 for carrying; and a suspension wire jacket 102 covering the steel cable 101; wherein the suspension wire jacket 102 and the outer sheath 8 are integrally structured , so as to realize the connection between the suspension wire jacket 102 and the outer sheath 8 of the power cable.

Furthermore, the suspension wire 10 is parallel to the cable core 9 and the suspension wire jacket 102 is part of the outer sheath 8 .

Since the grounding layer is set in the power cable, the anti-lightning ability of the power cable is increased, so that when a lightning strike occurs, the grounding layer can quickly guide the lightning entering the cable into the ground in an instant, thereby ensuring that the power cable and the base station equipment connected to the power cable safety.

In addition, the utility model uses the outer wrapping tape layer 5 and the inner wrapping tape layer 3 described below as reinforcing layers, so as to increase the strength of the cable.

More specifically, the self-supporting lightning protection power cable provided by the first embodiment shown in Figure 1 of the present utility model includes:

A cable core 9 for power transmission covered with an inner sheath 6;

Shielding the shielding layer 7 of the cable core 9;

An outer tape layer 5 covering the shielding layer 7;

An outer sheath 8 covering the outer tape layer 5;

a grounding outer conductor 4 disposed between the cable core 9 and the shielding layer 7; and

A suspension wire 10 connected to the outer sheath 7 .

The grounding outer conductor 4 can be a single copper wire or a bundle of twisted copper wires twisted by multiple strands of copper wires, and wraps the inner sheath 6 obliquely, and its wrapping pitch is 18-18% of the outer diameter of the cable core. 28 times.

Theoretically, the grounding outer conductor 4 can be grounded at any place, but in practice, the grounding outer conductor 4 is preferably grounded in a manned or unmanned room. The outer conductor 4 can effectively conduct instantaneous high voltage, so as to avoid damage to communication equipment caused by lightning.

The shielding layer 7 can be formed by wrapping the outer conductor 4 with, for example, a 0.1 mm copper tape, and the overlapping ratio of the wrapping is more than 25%. The shielding layer 7 can not only shield the electromagnetic field generated by the cable core 9 or the insulated core 1 itself so as not to interfere with other communication cable signals, but also can shield the cable core 9 from interference from external electromagnetic fields. The wrapping direction of the copper tape is opposite to that of the grounding outer conductor 5 .

On the other hand, since the shielding layer 7 made of copper tape directly wraps around the outer conductor 4, the shielding layer 7 and the outer conductor 4 are connected to form a grounding conductor, thereby enhancing the ability of the utility model to conduct instantaneous lightning high voltage. That is to say, since the two grounding conductors, the shielding layer 7 and the outer conductor 4, are used to induce lightning, the resistivity of the grounding conductor for lightning induction is greatly reduced, thereby improving the lightning protection effect.

Another feature of the utility model is that the outer sheath 8 is made of polyolefin material with low-smoke and halogen-free properties, which is not only beneficial to environmental protection, but also resistant to cold and ultraviolet rays, so that the power cable of the utility model is suitable for long-term outdoor use .

The cable core 9 may include: at least two insulated wire cores 1 ; an inner tape layer 3 covering the insulated wire cores 1 ; and an inner sheath 6 covering the inner tape layer 3 .

As mentioned above, the inner tape layer 3 can strengthen the strength of the power cable.

The insulated core 1 includes a conductor 11 and an insulating layer 12 covering the conductor 11; usually there are two insulated cores 1 . Since there are gaps between the insulated wire cores 1, the compression resistance is weakened, so the utility model fills the insulated wire cores 1 with filler materials 2 such as PP fibers or rock wool ropes, so as to reinforce the insulation The space between the wire cores 1 increases the compressive performance of the power cable.

During actual cable production, the insulated core 1 and the filler material 2 are twisted together.

The outer sheath 7 is made of cold-resistant low-smoke halogen-free polyolefin material, so as to ensure the normal operation of the power cable in a low-temperature environment.

The inner sheath 6 can be made of flame-retardant polyolefin material; both the inner tape layer 3 and the outer tape layer 5 can be made of polyester material; the insulating layer 12 can be made of cross-linked polyolefin material.

The conductor 11 can be formed by twisting multiple copper wires, and the cross-sectional area of the conductor 11 is the same as that of the grounded outer conductor. In this way, the same material can be used to make the conductor 11 and the grounding outer conductor, thereby facilitating production.

The suspension wire 10 is mainly formed by twisting steel cables 101, and the structure of the steel cables 101 is: one in the center and several such as 6 in the periphery. The steel cable 101 is covered by a suspension wire jacket 102. In the specific example shown in FIG. 1 or FIG. 2, the suspension wire jacket 1012 is a part of the outer sheath 8 of the power cable.

The difference between the second embodiment of the utility model shown in FIG. 2 and the first embodiment is only that there are three insulated wire cores 1 arranged in a font. There may also be more than three insulated wire cores 1, for example five.

The grounding layer or the grounding outer wire 4 located between the cable core and the shielding layer of the utility model can effectively conduct instantaneous high voltage and prevent lightning from causing damage to communication equipment. In addition, there is a copper tape shielding layer on the periphery of the grounding wire, which can effectively shield the interference of the electromagnetic field generated by the cable on the signals of other communication cables, and improve the performance of the cable. The outer sheath adopts cold-resistant low-smoke and halogen-free polyolefin materials, which are low-smoke and halogen-free, environmentally friendly, and resistant to ultraviolet rays and cold. Therefore, the self-supporting lightning protection power cable of the utility model can meet the requirements of communication base stations in harsh environments. The workplace works normally, and its environment adaptability is strong.

Although the utility model has been described in detail above, the utility model is not limited thereto, and those skilled in the art can make various modifications according to the principle of the utility model. Therefore, all modifications made according to the principle of the utility model should be understood as falling into the protection scope of the utility model.

Claims (10)

1. A self-supporting lightning protection power cable, comprising: a cable core (9) for transmitting electrical power; and a coating covering the cable core (9); It is characterized in that it also includes a suspension wire (10) connecting the covering layer; Wherein, the coating layer includes: Shielding the shielding layer (7) of the cable core (9); an outer tape layer (5) covering the shielding layer (7); an outer sheath (8) covering said outer tape layer (5); and A grounding layer (4) arranged between the cable core (9) and the shielding layer (7). 2. The self-supporting lightning protection power cable according to claim 1, characterized in that the grounding layer (4) is configured such that bundled copper wires twisted by multiple strands of copper wires obliquely wrap the cable A core (9), the wrapping pitch of which is 18 to 28 times the outer diameter of the cable core. 3. The self-supporting lightning protection power cable according to claim 1, characterized in that the grounding layer (4) is a grounding outer conductor, which obliquely wraps the inner sheath (6), and wraps around the joint The distance is 18 to 28 times the outer diameter of the cable core. 4. The self-supporting lightning protection power cable according to claim 2 or 3, characterized in that the shielding layer is formed by wrapping the outer conductor (5) with copper tape, and the overlapping rate of the wrapping is more than 25%. 5. The self-supporting lightning protection power cable according to claim 2 or 3, characterized in that the cable core (9) includes: At least two insulated wire cores (1); an inner tape layer (3) covering the insulated wire core (1); and An inner sheath (6) covering the inner tape layer (3). 6. The self-supporting lightning protection power cable according to claim 5, characterized in that the insulated core (1) comprises a conductor (11) and an insulating layer (12) covering the conductor (11). 7. The lightning protection power cable according to claim 6, characterized in that there are 2 to 5 insulated wire cores (1). 8. The self-supporting lightning protection power cable according to claim 7, characterized in that filler materials are filled between the insulated cores (1). 9. The self-supporting lightning protection power cable according to claim 5, characterized in that the suspension wire (10) comprises: Steel cables (101) for load bearing; and a hanging wire jacket (102) covering the steel cable (101); It is characterized in that the suspension wire jacket (102) and the outer sheath (8) are integrally structured. 10. The self-supporting lightning protection power cable according to claim 5, characterized in that the outer sheath (7) is made of polyolefin materials.

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