CN200972799Y - Mooring cable - Google Patents

Abstract

The utility model specifically relates to mooring cables. The technical problem to be solved is to provide a tethered cable, which can meet the technical requirements of lateral pressure resistance, high tensile strength and lightning strike resistance while reducing weight and volume. It is characterized in that: a copper-clad aluminum wire braided lightning guide layer, a tensile element layer, a metal flat wire braided layer as a power neutral wire, a filling layer, and a three phase line. The filling layer can fix the position of the three-phase line and enhance the structural stability of the cable; it can also effectively enhance the ability of the cable to resist lateral pressure and improve the withstand voltage level of the phase line of the power line. The flat wire braided structure is used as the neutral wire of the power line, which can greatly reduce the outer diameter of the cable, improve the ability of the cable to resist lateral pressure, and effectively protect the influence of the induced voltage caused by the cable being struck by lightning on the phase line of the power line. The lightning guide layer adopts the weaving form of multi-strand copper-clad aluminum wire, which can effectively reduce the weight of the cable and reduce the induced voltage generated by lightning strikes.

Description

a tethered cable

Technical field:

The utility model relates to the field of cables, in particular to mooring cables.

Background technique:

Airships, tethered balloons and other aerostats have broad application prospects in the military and civilian markets. Its development is in the ascendant and its application fields are becoming more and more extensive. The tethered cable is the link between the aerostat and the ground. Its special working environment requires it to have the characteristics of light weight, lateral pressure resistance, high tensile strength, and lightning strike resistance.

In the prior art, the structure of the 3-phase 4-wire system current cable is shown in Figure 1, 11 is a filler; 12 is a tensile element layer composed of a plurality of aramid fibers distributed inside and outside the power cord; 13 is a power cord; 14 is a lightning guide layer composed of multiple copper wire bundles twisted outside the tensile material layer; 15 is a black polyolefin outer sheath. In the middle of the inner and outer two tensile element layers, 12 power lines (3 power lines are combined and used as one line) are evenly distributed and twisted to form a 3-phase 4-wire electrical structure. Although this kind of cable structure has the advantage of good lateral pressure resistance, the tensile components are scattered, and the utilization rate of the tensile components is not high after mating with the connector; the lightning-conducting layer is a copper wire bundle structure, and the inductance is large , cannot effectively reduce the induced voltage caused by the cable being struck by lightning; the cable is large in size and its weight cannot be effectively controlled.

Invention content:

The technical problem to be solved by the utility model is to provide a tethered cable for the deficiencies of the prior art. Require.

In order to solve the problems of the technologies described above, the utility model proposes the following technical solutions and realizes:

A tethered cable, the outermost layer of which is an outer sheath 6, characterized in that: a lightning guide layer 5 of a copper-clad aluminum wire braided structure, a tensile element layer 4, The metal flat wire braiding layer 3 used as the zero line of the power supply, the filling layer 2, and the three power lines 1 twisted in the center to form a three-phase electrical structure.

A layer of isolation layer for isolation from the tensile element layer is wrapped around the braided layer 3 of the flat metal wire as the neutral wire of the power supply.

The utility model brings the following beneficial effects:

1. The filling layer can fix the position of the three-phase line and enhance the structural stability of the cable; it can effectively enhance the ability of the cable to resist lateral pressure; it can improve the withstand voltage level of the phase line of the power line.

2. The flat wire braided structure is used as the neutral wire of the power line. First, it does not occupy the cable space of the phase wire, and can greatly reduce the outer diameter of the cable. The saved space can be used to increase the thickness of the filling layer to enhance the stability of the cable structure. , enhance the ability to withstand lateral pressure, and improve the level of pressure resistance.

Secondly, the flat wire braiding structure can reduce the outer diameter of the braiding; in the case of the same thickness of the outer sheath of the cable, the weight of the cable can be reduced.

Thirdly, it can improve the lateral pressure resistance of the cable, because the flat wire has excellent lateral pressure resistance compared with the round wire, and the tethered cable often works under high lateral pressure, so the reliability of the cable is also improved.

Finally: The neutral line adopts a braided structure, which has a certain shielding effect and can effectively protect the influence of the induced voltage on the phase line of the power line caused by the lightning strike of the cable.

3. The lightning guide layer adopts the weaving form of multi-strand copper-clad aluminum wire. Firstly: Compared with copper wire with equivalent cross-sectional area, it can effectively reduce the weight of the cable; secondly: the lightning-conducting layer adopts a braided structure, which can effectively reduce the inductance of the lightning-conducting layer of the cable, reduce the induced voltage generated by lightning strikes, and thus reduce the induction voltage. Voltage damage to cables.

Description of drawings:

Figure 1: Schematic diagram of the existing tethered cable structure

Fig. 2: Structural schematic diagram of a preferred embodiment of the utility model

Detailed ways:

Below in conjunction with accompanying drawing and specific embodiment the utility model is further described:

Referring to Fig. 2, Fig. 2 is a preferred embodiment.

1 in the figure is three power lines twisted in the center to form a three-phase electrical structure. The phase wire conductor of the power line adopts the structure of multi-strand copper wire twisted wire, and the insulation of the three power lines adopts polyolefin insulation material. If there is a need for signal transmission, one or more optical fibers can also be added to the cable core.

Figure 2 is the filling layer. After the three power lines are cabled, extrude the polyolefin material filling layer to fix the position of the three-phase line and enhance the structural stability of the cable; it can also effectively enhance the ability of the cable to resist lateral pressure and improve the withstand voltage of the phase line of the power line level.

3 in the figure is the neutral wire of the power cord. In order to reduce the outer diameter of the cable and reduce the weight of the cable, a layer of copper flat wire is braided outside the filling layer as the neutral wire of the power cord; The shielding effect can effectively protect the influence of the induced voltage on the phase line of the power line caused by the lightning strike of the cable. In this embodiment, a layer of isolation layer is wrapped around the braided flat wire to reduce wear on the tensile element. Copper flat wires can be ordinary electrician copper flat wires or silver-plated and tin-plated copper flat wires.

4 in the figure is the tensile element layer. After wrapping the isolation layer, the tensile element is armored. In this embodiment, the tensile element is aramid fiber, and other high-strength tensile fiber materials can also be used.

5 in the figure is the lightning-conducting layer. The lightning-conducting layer adopts the braided form of multi-strand copper-clad aluminum wires, which can effectively reduce the weight of the cable. Reduce damage to cables caused by induced voltage.

6 in the figure is the cable outer sheath. The user requires the cable sheath to be wear-resistant, soft, and retractable many times, so the cable outer sheath is made of wear-resistant polyolefin material.

Claims (2)

1, a kind of mooring cable, its outermost layer is oversheath (6), it is characterized in that: three power lines (1) of leading thunder layer (5), tensile elements layer (4), the metal lenticular wire braid (3) as zero-power line, packed layer (2) and being positioned at the stranded composition three-phase electricity structure at center that are provided with the copper-clad aluminum conductor braiding structure in oversheath (6) from outside to inside successively.

2, according to the described a kind of mooring cable of claim 1, it is characterized in that: outside metal lenticular wire braid (3), be surrounded with one deck separator that is used for the isolation of tensile elements layer as zero-power line.

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