CN214897718U - Torsion-resistant medium-voltage cable for wind power generation with aluminum alloy conductor - Google Patents

Abstract

The utility model discloses a resistant aluminum alloy conductor medium voltage cable for wind power generation that twists reverse, including cable core, resistant elastic layer that twists reverse, third resistant fibrous layer and restrictive coating from inside to outside wrap up the cable core, and the filling is equipped with resistant elastic layer that twists reverse between cable core and the third resistant fibrous layer of twisting reverse, and the cable core is twisted by a plurality of power lines, a plurality of ground wires and optical unit and is formed; the power line comprises an aluminum alloy conductor, an aluminum alloy conductor reinforcing core, a first torsion-resistant fiber layer, a semi-conductive organic coating, a conductor shielding layer, an insulating shielding layer and a mixed braided shielding layer, wherein the aluminum alloy conductor reinforcing core is arranged at the center of the aluminum alloy conductor, and the first torsion-resistant fiber layer, the semi-conductive organic coating, the conductor shielding layer, the insulating shielding layer and the mixed braided shielding layer wrap the aluminum alloy conductor from inside to outside. The utility model discloses cable structure has realized "aluminium and has replaced copper", has obviously reduced manufacturing cost, has alleviated the demand to metallic copper.

Description

Torsion-resistant medium-voltage cable for wind power generation with aluminum alloy conductor

Technical Field

The utility model relates to the technical field of cables, especially, relate to a resistant aluminum alloy conductor medium voltage cable for wind power generation that twists reverse.

Background

At present, wind power generation is developing towards the trend of large megawatts, and the region also turns to plateaus, deserts and oceans, which puts higher requirements on the environmental adaptability of the distortion-resistant cable. In order to change the situation that a large number of copper-core cables are needed for power generation and grid connection of a wind turbine generator system, a box-type substation is designed in a cabin, the voltage level is improved to reduce the current to reduce the use of the copper-core cables, or an aluminum alloy conductor is adopted to replace a copper conductor to further reduce the use of the metal copper, so that the theoretical feasible scheme is provided. As is known, the common aluminum alloy conductor has a tendency of creep under the action of force, the tensile strength of the common aluminum alloy conductor is far lower than that of copper, and the connection performance of the common aluminum alloy conductor is lower than that of copper, so that the medium voltage cable used for the torsion-resistant aluminum alloy conductor in the tower has not appeared.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides a resistant aluminum alloy conductor medium voltage cable for wind power generation that twists reverse.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a torsion-resistant medium-voltage cable for wind power generation with an aluminum alloy conductor comprises a cable core, a torsion-resistant elastic layer, a third torsion-resistant fiber layer and a sheath layer, wherein the cable core is wrapped by the third torsion-resistant fiber layer and the sheath layer from inside to outside, the torsion-resistant elastic layer is filled between the cable core and the third torsion-resistant fiber layer, the cable core is formed by twisting a plurality of power lines, a plurality of ground lines and optical units, the optical units are arranged in the center of the cable core, the plurality of power lines are adjacently arranged along the circumference of the optical units, and the plurality of ground lines are separately arranged in gaps between two adjacent power lines;

the power line comprises an aluminum alloy conductor, an aluminum alloy conductor reinforcing core, a first torsion-resistant fiber layer, a semiconductive organic coating, a conductor shielding layer, an insulating shielding layer and a mixed braided shielding layer, wherein the aluminum alloy conductor reinforcing core is arranged at the center of the aluminum alloy conductor, the first torsion-resistant fiber layer, the semiconductive organic coating, the conductor shielding layer, the insulating shielding layer and the mixed braided shielding layer wrap the aluminum alloy conductor from inside to outside, and the semiconductive organic coating is coated on the surface of the first torsion-resistant fiber layer;

the optical unit comprises a fiber core, and a tensile fiber layer, a metal belt spiral tube and a metal braid layer which are wrapped outside the fiber core from inside to outside.

Preferably, the aluminum alloy conductor is formed by regularly twisting a plurality of aluminum alloy wires with the monofilament diameter not more than 0.36mm, and the twist pitch diameter ratio is 20-30.

Preferably, the aluminum alloy conductor reinforcing core is a strand of tightly twisted aramid rope or is formed by stranding a plurality of high-elastic steel wires with the monofilament diameter of not more than 0.2 mm.

Preferably, the first torsion-resistant fiber layer is a high-strength aramid fiber silk braid layer, and the braiding coverage rate is not lower than 90%; the second torsion-resistant fiber rope is a high-strength aramid rope; the third anti-torsion fiber layer is a high-strength aramid fiber silk braid layer, and the braiding coverage rate is more than 90%.

Preferably, the semiconductive organic coating is a silicone lacquer.

Preferably, the fiber core comprises a plurality of bare fibers, tensile fibers, silicon-based fiber paste and a loose tube, the tensile fibers are arranged outside the bare fibers, the loose tube wraps the bare fibers and the tensile fibers, and the silicon-based fiber paste is filled between the loose tube and the bare fibers and between the loose tube and the tensile fibers.

Preferably, the torsion-resistant elastic layer is silicone rubber, and the sheath layer is a rubber sheath.

Compared with the prior art, the beneficial effects of the utility model are that: the utility model provides a resistant aluminum alloy conductor medium voltage cable for wind power generation that twists reverse is resistant, satisfies cabin to the operation requirement of column foot cable, with the help of optic fibre, can direct remote monitoring wind generating set's running state, has realized moreover that "aluminium replaces copper", has obviously reduced manufacturing cost, has alleviated the demand to metallic copper.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention;

fig. 2 is a schematic view of the structure of the light unit of the present invention.

In the figure: 1. an aluminum alloy conductor; 2. an aluminum alloy conductor reinforcing core; 3. a conductor shield layer; 4. an insulating layer; 5. an insulating shield layer; 6. a ground wire; 7. a light unit; 8. an inner sheath; 9. a third twist resistant fiber layer; 10. a sheath layer; 11. a first twist resistant fiber layer; 12. a hybrid braided shielding layer; 13. a semiconductive organic coating; 71. bare fiber; 72. a tensile fiber; 73. silicon-based fiber paste; 74. loosening the sleeve; 75. a tensile fiber layer; 76. a metal band spiral tube; 77. a metal braid.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. 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 invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example (b):

referring to fig. 1-2, the torsion-resistant medium-voltage cable for the aluminum alloy conductor wind power generation is characterized in that a cable conductor is made of an aluminum alloy material, the voltage class of the cable is 6 kV-35 kV, and optical fibers are contained in the cable.

The medium-voltage cable for wind power generation with the torsion-resistant aluminum alloy conductor comprises a cable core, a torsion-resistant elastic layer 8, a third torsion-resistant fiber layer 9 and a sheath layer 10, wherein the third torsion-resistant fiber layer 9 and the sheath layer 10 wrap the cable core from inside to outside, the torsion-resistant elastic layer 8 is filled between the cable core and the third torsion-resistant fiber layer 9, the cable core is formed by twisting a plurality of power lines, a plurality of ground lines 6 and optical units, the optical units 7 are arranged at the center of the cable core, the plurality of power lines are arranged adjacently along the circumference of the optical units 7, and the plurality of ground lines 6 are separately arranged in gaps between the two adjacent power lines.

The power line comprises an aluminum alloy conductor 1, an aluminum alloy conductor reinforcing core 2, a first torsion-resistant fiber layer 11, a semi-conductive organic coating 13, a conductor shielding layer 3, an insulating layer 4, an insulating shielding layer 5 and a mixed braided shielding layer 12, wherein the aluminum alloy conductor reinforcing core 2 is arranged at the center of the aluminum alloy conductor 1, and the first torsion-resistant fiber layer 11, the semi-conductive organic coating 13, the conductor shielding layer 3, the insulating layer 4, the insulating shielding layer 5 and the mixed braided shielding layer 12 wrap the aluminum alloy conductor 1 from inside to outside.

The aluminum alloy conductor 1 is formed by twisting a plurality of aluminum alloy wires with the monofilament diameter not greater than 0.36mm in a normal mode, the twist pitch diameter ratio is 20-30, the aluminum alloy conductor reinforcing core 2 is arranged in the middle of the aluminum alloy conductor 1, and the aluminum alloy conductor reinforcing core 2 is formed by twisting a strand of tightly twisted aramid rope or twisting a plurality of high-elastic steel wires with the monofilament diameter not greater than 0.2 mm. The surface of the aluminum alloy conductor 1 is woven by adopting a plurality of strands of high-strength aramid filaments (namely a first torsion-resistant fiber layer 11), the weaving coverage rate is not lower than 90%, then semiconductive organic silicon paint (namely a semiconductive organic coating 13) is coated, the semiconductive organic coating 13 is irradiated and crosslinked under ultraviolet light, the thickness of the semiconductive organic coating 13 is 0.3-0.5 mm, and the inner conductor shielding layer 3, the insulating layer 4 and the insulating shielding layer 5 are extruded once again. The insulating layer 4 is made of ethylene propylene rubber, and the insulating thickness is 4.0 mm-12.0 mm; and a mixed braided shielding layer 12 of high-strength aramid ropes and metal wires is arranged outside the insulating shielding layer 5.

The optical unit includes a core, and a tensile fiber layer 75, a spiral metal-tape 76, and a metal braid 77, which are wrapped around the core from inside to outside. The fiber core comprises a plurality of bare fibers 71, tensile fibers 72, silicon-based fiber paste 73 and a loose tube 74, the tensile fibers 72 are arranged outside the bare fibers 71, the loose tube 74 wraps the bare fibers 71 and the tensile fibers 72, and the silicon-based fiber paste 73 is filled between the loose tube 74 and the bare fibers 71 and between the loose tube 74 and the tensile fibers 72.

The residual length of the bare fiber 71 relative to the loose tube 74 is not less than 0.3%, the residual length of the loose tube 74 relative to the metal-tape spiral tube 76 is not less than 0.5%, and the residual length of the optical unit 7 relative to the cable core is not less than 0.4%.

The high-strength aramid fiber yarns are adopted for weaving after the cable core is twisted, the inner sheath 8 is made of high-resilience silicon rubber and is full of gaps of the cable core, the high-strength aramid fiber yarns are woven outside the inner sheath 8 (namely, a third torsion-resistant fiber layer 9), the weaving coverage rate is more than 90%, a weaving layer is coated with a high-temperature-resistant adhesive, and the outermost layer is a low-smoke halogen-free rubber sheath (namely, a sheath layer 10).

The utility model has the advantages that:

in order to improve the torsion resistance of the cable at the positive and negative 360 degrees, the twisting pitch-diameter ratio of the cable is a key factor, if the pitch-diameter ratio is too small, when the twisting direction is consistent with the twisting direction, a conductor of the cable is in a tightening state, the conductor is easy to break at a certain defect position, the broken conductor penetrates into an insulating layer to cause cable breakdown accidents, when the twisting direction is opposite to the twisting direction, the conductor of the cable tends to be loose, and the conductor monofilament is subjected to extrusion shearing force and is broken at a certain weak point. So relapse, the phenomenon of cable conductor emergence "cun disconnected", conductor resistance grow greatly, and the heat generation sharply increases, and the conductor fuses, even the cable fires the burning, and the cable can not continue to use again. If the pitch diameter ratio is too large, obviously, the bending performance of the cable is poor, when the external force forcing the cable to bend is large, the cable conductor deforms and cannot be recovered, the process is repeated, the conductor at the deformed position is broken, and even qualified products cannot be produced, so that the twisting pitch diameter ratio of the cable is designed to be 20-30, and the extreme situation can be avoided.

The reinforcing core is arranged in the middle of the conductor, so that the tensile force which can be borne by the conductor is obviously improved. The conductor shield is composite construction, and the direct tight cladding of high strength aramid fiber silk woven mesh wherein is on the conductor surface, when the cable withstood the torsion, disperses the torsion that certain local conductor bore to whole root cable to avoid certain local position conductor fracture's the condition to appear. The same reason, the high strength aramid fiber silk weaving layer of the first resistant fibrous layer that twists reverse, the high strength aramid fiber rope of the resistant fibrous layer that twists reverse of second, the high strength aramid fiber silk weaving layer of the resistant fibrous layer that twists reverse of third and strengthen the core and all play the effect of further dispersion torsion, have further guaranteed cable construction's reliability.

When the cable is twisted, the pitch-diameter ratios and the relative positions of the three power lines are changed inevitably, the high-elasticity silica gel inner sheath effectively buffers the change, and when the cable is twisted reversely, the high-elasticity silica gel is beneficial to the cable core to restore to the original position. The integral torsion resistance of the cable is greatly improved.

The silica-based fiber paste in the optical unit has proper viscosity, high temperature resistance and good thermal stability, and effectively protects bare fibers from being influenced by temperature when short-time high temperature is generated due to short circuit of a cable or instantaneous high temperature is generated due to lightning stroke, thereby ensuring the transmission performance of optical fibers. The silica-based fiber paste and the tensile fiber act together to enable the bare fiber to be in a macroscopic 'suspension' state, and when the cable is bent and twisted, the bare fiber has enough buffer space without being influenced by external force, so that the integrity of the optical fiber is ensured. The loose tube containing the fiber paste is made of PBT (polybutylene terephthalate), the PBT has excellent high-temperature stability and extremely low water absorption, and excellent dimensional stability can be kept in the cable manufacturing and running processes, so that the extra length of the optical fiber cannot be changed, and the reliability of the optical fiber is improved. Similarly, a plurality of strands of high-strength fibers are arranged on the periphery of the PBT loose tube, so that the PBT loose tube is in a macroscopic 'suspension' state, namely the center position of the metal band spiral tube, the minimum ratio of the inner diameter of the metal band spiral tube to the outer diameter of the PBT loose tube is 1.2/1, and the larger the number of the fibers which can be actually accommodated is, the larger the controllable residual length of the PBT loose tube is. Similarly, by controlling the pay-off tension of the optical unit, and if necessary, zero tension pay-off, the optical unit also has a certain excess length relative to the cable core. By combining the three extra lengths, the total extra length can reach 1.2 percent, and the reliability of the optical fiber is obviously improved. In addition, the bare fiber and PBT loose tube has enough buffer space in the metal belt spiral tube, which ensures that the optical fiber is not influenced when the cable is bent, twisted and pulled. The 1.2% excess ensures fiber integrity even if locally involved.

The inner sheath and the outer sheath are tightly combined together, so that the tensile strength and the tearing strength of the sheath layer are improved.

The medium-voltage cable containing the optical fiber for wind power generation is torsion-resistant, meets the use requirement of a cable from a cabin to a tower footing, can directly and remotely monitor the running state of a wind generating set by means of the optical fiber, realizes 'aluminum replaces copper', obviously reduces the manufacturing cost, and relieves the requirement on metal copper.

Above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the design of the present invention, equivalent replacement or change should be covered within the protection scope of the present invention.

Claims (7)

1. The medium-voltage cable for wind power generation with the torsion-resistant aluminum alloy conductor is characterized by comprising a cable core, a torsion-resistant elastic layer, a third torsion-resistant fiber layer and a sheath layer, wherein the third torsion-resistant fiber layer and the sheath layer wrap the cable core from inside to outside, the torsion-resistant elastic layer is filled between the cable core and the third torsion-resistant fiber layer, the cable core is formed by twisting a plurality of power lines, a plurality of ground lines and optical units, the optical units are arranged in the center of the cable core, the plurality of power lines are adjacently arranged along the circumference of the optical units, and the plurality of ground lines are separately arranged in gaps between two adjacent power lines;

the power line comprises an aluminum alloy conductor, an aluminum alloy conductor reinforcing core, a first torsion-resistant fiber layer, a semiconductive organic coating, a conductor shielding layer, an insulating shielding layer and a mixed braided shielding layer, wherein the aluminum alloy conductor reinforcing core is arranged at the center of the aluminum alloy conductor, the first torsion-resistant fiber layer, the semiconductive organic coating, the conductor shielding layer, the insulating shielding layer and the mixed braided shielding layer wrap the aluminum alloy conductor from inside to outside, the semiconductive organic coating is coated on the surface of the first torsion-resistant fiber layer, and the mixed braided shielding layer is a second torsion-resistant fiber rope and metal wire mixed braided shielding layer;

the optical unit comprises a fiber core, and a tensile fiber layer, a metal belt spiral tube and a metal braid layer which are wrapped outside the fiber core from inside to outside.

2. The medium voltage cable for wind power generation with the torsion-resistant aluminum alloy conductor according to claim 1, wherein the aluminum alloy conductor is formed by regularly twisting a plurality of aluminum alloy wires with the monofilament diameter of not more than 0.36mm, and the twist pitch ratio is 20-30.

3. The torsion-resistant medium voltage cable for wind power generation with the aluminum alloy conductor as claimed in claim 1, wherein the aluminum alloy conductor reinforcing core is a strand of tightly twisted aramid rope or is formed by stranding a plurality of high-elastic steel wires with monofilament diameter not greater than 0.2 mm.

4. The medium voltage cable for wind power generation with the torsion-resistant aluminum alloy conductor as claimed in claim 3, wherein the first torsion-resistant fiber layer is a high-strength aramid fiber braided layer, and the braiding coverage rate is not lower than 90%; the second torsion-resistant fiber rope is a high-strength aramid rope; the third anti-torsion fiber layer is a high-strength aramid fiber silk braid layer, and the braiding coverage rate is more than 90%.

5. The medium voltage cable for wind power generation with a torsion-resistant aluminum alloy conductor according to claim 4, wherein the semiconductive organic coating is a silicone paint.

6. The medium voltage cable for wind power generation with torsion-resistant aluminum alloy conductor according to claim 1, wherein the fiber core comprises a plurality of bare fibers, tensile fibers, silicon-based fiber paste, and a loose tube, the tensile fibers are arranged outside the bare fibers, the loose tube wraps the bare fibers and the tensile fibers, and the silicon-based fiber paste is filled between the loose tube and the bare fibers and the tensile fibers.

7. The torsion-resistant aluminum alloy conductor wind power generation medium-voltage cable as claimed in claim 1, wherein the torsion-resistant elastic layer is a silicone rubber, and the sheath layer is a rubber sheath.

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