CN220873301U - Capacity-increasing overhead insulated cable suitable for voltage class below 20kV in city - Google Patents
Capacity-increasing overhead insulated cable suitable for voltage class below 20kV in city Download PDFInfo
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- CN220873301U CN220873301U CN202322653739.XU CN202322653739U CN220873301U CN 220873301 U CN220873301 U CN 220873301U CN 202322653739 U CN202322653739 U CN 202322653739U CN 220873301 U CN220873301 U CN 220873301U
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- heat insulation
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- 238000009413 insulation Methods 0.000 claims abstract description 53
- 239000013307 optical fiber Substances 0.000 claims abstract description 42
- 229910052751 metal Inorganic materials 0.000 claims abstract description 24
- 239000002184 metal Substances 0.000 claims abstract description 24
- 239000004020 conductor Substances 0.000 claims abstract description 21
- 229920005830 Polyurethane Foam Polymers 0.000 claims abstract description 18
- 239000002131 composite material Substances 0.000 claims abstract description 18
- 239000011496 polyurethane foam Substances 0.000 claims abstract description 18
- 229910000838 Al alloy Inorganic materials 0.000 claims abstract description 14
- 239000002674 ointment Substances 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 239000004696 Poly ether ether ketone Substances 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 229920000840 ethylene tetrafluoroethylene copolymer Polymers 0.000 claims description 4
- -1 ethylene-tetrafluoroethylene Chemical group 0.000 claims description 4
- 229920002530 polyetherether ketone Polymers 0.000 claims description 4
- 229920002379 silicone rubber Polymers 0.000 claims description 3
- 239000000835 fiber Substances 0.000 claims 1
- 238000012546 transfer Methods 0.000 abstract description 2
- 230000003287 optical effect Effects 0.000 description 14
- 230000005540 biological transmission Effects 0.000 description 8
- 238000004891 communication Methods 0.000 description 8
- 238000010276 construction Methods 0.000 description 7
- 230000005684 electric field Effects 0.000 description 4
- 230000006872 improvement Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- RRVPPYNAZJRZFR-VYOBOKEXSA-N 1-oleoyl-2-palmitoyl-sn-glycero-3-phosphocholine Chemical compound CCCCCCCCCCCCCCCC(=O)O[C@@H](COP([O-])(=O)OCC[N+](C)(C)C)COC(=O)CCCCCCC\C=C/CCCCCCCC RRVPPYNAZJRZFR-VYOBOKEXSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000003779 heat-resistant material Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- Communication Cables (AREA)
Abstract
The utility model discloses a compatibilized overhead insulated cable suitable for voltage class below 20kV in cities, which comprises an optical fiber composite compatibilized Rong Daoti, a conductor shielding layer and an insulating sheath, wherein the optical fiber composite compatibilized conductor comprises an insulating light unit, an inner insulating layer and an outer conductive layer group, and the insulating light unit comprises a sleeve, a water-blocking ointment and a colored optical fiber; the inner heat insulation layer adopts polyurethane foam; the outer conductive layer group comprises 2-4 stranded layers, each metal monofilament of the stranded layer closest to the inner heat insulation layer is a molded line, and a gap exists between the stranded layer closest to the inner heat insulation layer and the inner heat insulation layer; each metal monofilament of the other stranded layers is a round wire except the stranded layer closest to the inner heat insulation layer. The outer conductive layer group is made of the heat-resistant aluminum alloy, so that the safety requirement of higher temperature and the line capacity-increasing condition are met, the outer conductive layer group and the insulating light unit are separated by the polyurethane foam, heat transfer to the insulating light unit is effectively prevented, and the influence on the service performance due to the fact that the temperature of the colored optical fiber is too high is prevented.
Description
Technical Field
The utility model belongs to the field of cables, and particularly relates to a capacity-increasing overhead insulated cable suitable for voltage classes below 20kV in cities.
Background
In the process of constructing a power grid communication network based on a power transmission line, the method is mainly solved by adopting an optical fiber composite overhead ground wire (OPGW), an optical fiber composite overhead phase wire (OPPC) or an all-medium self-supporting optical cable (ADSS) which is hung on the existing tower. The optical unit for signal transmission in the existing optical fiber composite overhead phase line is made of stainless steel and other metal sleeves which are coated with optical fibers, and meanwhile, water-blocking ointment is filled in the sleeves. In the construction process of the type of optical cable, a special connector box and a special operator are required to carry out photoelectric separation operation, and higher operation skills and special construction equipment are required. Meanwhile, the phase line needs to be fixed in length and matched with a disc, and the phase line is put on a tower for overhead welding of optical fibers. The line erection construction time is long, the cost is high, the line erection construction time cannot be widely popularized in the power distribution network, and particularly the line erection construction time is outstanding in old line reconstruction projects. The existing tower pole is additionally provided with the all-medium self-supporting optical cable (ADSS), so that the sufficient safety distance between the all-medium self-supporting optical cable and the ground cannot be ensured due to insufficient tower pole height in many occasions, and the application range of the all-medium self-supporting optical cable is limited.
With the rapid development of national economy, the demand for electricity is vigorous. In line reconstruction, besides the requirement for power grid communication, the requirement for power transmission capacity is greatly increased, and part of capacity requirements greatly exceed design conveying capacity, so that a capacity-increasing optical fiber composite phase line is generated.
The conventional structure of the existing capacity-increasing optical fiber composite phase line is that an optical unit and a wire are twisted together, the inner and outer sides of the optical unit are respectively provided with the wire which is in direct contact with an insulating optical unit, the current-carrying capacity of the wire is relatively high, the continuous use temperature can reach 90 ℃, so that the heating value is large, and if the heat of the wires at the inner and outer sides of the optical unit is continuously transferred to the optical unit, the loss of the optical fiber is rapidly increased under a high-temperature environment, and the normal transmission of the optical unit is influenced.
Disclosure of utility model
Aiming at the defects or improvement demands of the prior art, the utility model provides the compatibilized overhead insulated cable suitable for the voltage class below 20kV in the city, the outer conductive layer group is formed by twisting heat-resistant aluminum alloy wires instead of electrical aluminum wires, the safety requirement of higher temperature can be met, the insulated light unit meets the line compatibilization condition, and the polyurethane foam can separate the outer conductive layer group from the central insulated light unit, so that heat is effectively prevented from being transferred to the insulated light unit, and the influence on the service performance due to the fact that the temperature of an optical fiber is too high is prevented.
In order to achieve the above object, according to the present utility model, there is provided a compatibilized overhead insulated cable suitable for use in voltage class below 20kV in cities, characterized by comprising an optical fiber composite add Rong Daoti, a conductor shielding layer and an insulating sheath arranged from inside to outside, wherein:
The optical fiber composite compatibilizing conductor comprises an insulating light unit, an inner heat insulation layer and an outer conductive layer group which are sequentially arranged from inside to outside, wherein the insulating light unit comprises a sleeve, water-blocking ointment and colored optical fibers grouped by chromatograph, the colored optical fibers are positioned in the sleeve, the water-blocking ointment is filled between the colored optical fibers and the sleeve, and the sleeve is made of ethylene-tetrafluoroethylene or polyether-ether-ketone;
The inner heat insulation layer is made of polyurethane foam with the thickness of 2-3 mm, and the polyurethane foam wraps the insulating light unit;
For the outer conductive layer group, the outer conductive layer group comprises 2-4 stranded layers which are sequentially arranged from inside to outside, each stranded layer is formed by stranding metal monofilaments, each metal monofilament of the stranded layer closest to the inner heat insulation layer is a molded line, and a gap exists between the stranded layer closest to the inner heat insulation layer and the inner heat insulation layer so as to insulate heat by using air at the gap; except the stranded layer closest to the inner heat insulation layer, each metal monofilament of each other stranded layer is a round wire and is made of heat-resistant aluminum alloy;
the conductor shielding layer wraps the outer conductive layer group;
The insulating sheath wraps the conductor shielding layer, and the insulating sheath is made of a silicon rubber material.
Preferably, a part of or all of the metal filaments of the stranded layer closest to the inner insulation layer are made of high-strength aluminum-clad steel wires so as to adapt to the requirements of different lines on the tensile strength of the wires.
Preferably, the metallic filaments of the stranded layer closest to the inner insulation layer are made of a heat resistant aluminum alloy.
Preferably, each of the heat-resistant aluminum alloy wires of the stranded layer closest to the inner insulating layer has a cross-sectional shape of a trapezoid or a fanning ring.
Preferably, the cross section of the metal filaments of the stranded layer closest to the inner insulation layer is trapezoidal or SZ-shaped.
Preferably, the number of colored optical fibers of the insulating light unit is not less than 24.
Preferably, the outer diameter of the insulated light unit is 3.5 mm-8 mm.
Preferably, the wall thickness of the sleeve is between 0.2mm and 0.8mm.
Preferably, the sleeve has a tensile strength greater than 90Mpa.
Preferably, the sleeve has a lateral pressure resistance of greater than 1000N/10cm.
In general, the above technical solutions conceived by the present utility model, compared with the prior art, enable the following beneficial effects to be obtained:
1) The heat-resistant aluminum alloy wire of the outer conductive layer group can be used for conveying current on an overhead transmission and distribution line, has high temperature resistance, high current carrying capacity and good capacity-increasing effect, the sleeve of the insulating light unit is also made of high-temperature-resistant materials, polyurethane foam of the inner heat-insulating layer between the insulating light unit and the outer conductive layer group, and an air gap is formed between the stranded layer nearest to the inner heat-insulating layer and the inner heat-insulating layer, so that heat of the outer conductive layer group can be effectively isolated from being transferred to the insulating light unit.
2) The utility model is suitable for the capacity-increasing overhead insulated cable with the voltage class below 20kv, and most of heat generated by the molded line of the stranded layer closest to the inner heat insulation layer can be outwards dispersed through the round line of the outer layer, so that the influence on the service performance caused by the too high temperature of the colored optical fiber of the central optical unit can be prevented, and the continuous service temperature of the capacity-increasing overhead insulated cable can reach 120-150 ℃.
3) The utility model is suitable for the capacity-increasing overhead insulated cable with the voltage class below 20kv in the city, the conductor shielding layer can be used for homogenizing the electric field, the electric field is prevented from suddenly changing on the interface to break through the insulating sheath, the shielding and grounding functions are also realized, the insulating sheath can protect the cable from mechanical damage, and the cable is resistant to high temperature.
Drawings
Fig. 1 is a schematic structural view of the present utility model.
Detailed Description
The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model. In addition, the technical features of the embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.
Referring to fig. 1, a compatibilized overhead insulated cable suitable for voltage class below 20kV in cities comprises an optical fiber composite add Rong Daoti, a conductor shielding layer and an insulating sheath, which are arranged from inside to outside, wherein:
The optical fiber composite compatibilization conductor comprises an insulating light unit 1, an inner heat insulation layer and an outer conductive layer group which are sequentially arranged from inside to outside, wherein:
The insulated light unit 1 comprises a sleeve 11, a water-blocking ointment 12 and chromatographic grouping colored optical fibers 13, wherein the colored optical fibers 13 are positioned in the sleeve 11, the water-blocking ointment 12 is filled between the colored optical fibers 13 and the sleeve 11, the high-temperature-resistant water-blocking ointment 12 is preferred, and the sleeve 11 is made of ethylene-tetrafluoroethylene or polyether ether ketone; the insulated light unit is at the innermost part of the optical fiber composite compatibilized conductor. The ethylene-tetrafluoroethylene or polyether-ether-ketone materials are high temperature resistant materials, so that the line capacity increasing condition is met, the communication is stabilized, and the reliability of the power distribution network is improved.
The number of colored optical fibers 13 of the insulated light unit 1 is preferably not less than 24, and the communication ability is high. The colored optical fiber 13 is preferably a communication optical fiber. The insulated light unit 1 adopts a nonmetal insulation all-medium structure, is simple and easy to carry out photoelectric separation and optical fiber connection, can directly guide an optical cable to the ground for connection construction, can obviously reduce the construction time of a line, and is particularly suitable for a power transmission line with limited overhead line corridor of 20kV or below and needing to improve the power transmission capacity.
The inner heat insulation layer adopts polyurethane foam 2 with the thickness of 2-3 mm, and the polyurethane foam wraps the insulating light unit; the polyurethane foam 2 of the inner insulation layer can play a role of effectively insulating external heat. Because the overall diameter of the optical fiber composite compatilizer is generally not too large, the polyurethane foam 2 with the diameter of 2 mm-3 mm can meet the heat insulation requirement of most optical fiber composite compatilizer. The polyurethane foam 2 can be wrapped around or longitudinally wrapped on the insulating light unit, and the polyurethane foam 2 with the thickness of 2 mm-3 mm is arranged on the optical fiber composite compatibilizing conductor, so that the weight is light, and the erection is convenient. When the internal insulating light unit 1 needs to be peeled, a cutter can be used for cutting the polyurethane foam 2, and the peeling is convenient.
For the outer conductive layer group, the outer conductive layer group comprises 2-4 stranded layers which are sequentially arranged from inside to outside, and can meet different power transmission capacity requirements, each stranded layer is formed by stranding metal monofilaments 3, each metal monofilament 3 of the stranded layer closest to the inner heat insulation layer is a molded line (molded line refers to a bare line and a conductor with cross sections which are not circular, and the cross section of the common molded line is trapezoid, fan-shaped, SZ-shaped, arched and the like). A gap exists between the stranded layer closest to the inner heat insulation layer and the inner heat insulation layer so as to insulate heat by using air at the gap; each of the metal filaments 3 of each of the other twisted layers except the twisted layer closest to the inner insulation layer is a round wire, i.e., only each of the metal filaments 3 of the twisted layer closest to the inner insulation layer, and the metal filaments of the other layers are round wires. The stranded layer closest to the inner heat insulation layer is formed by stranding a molded line, so that the stranded layer closest to the inner heat insulation layer is integrally formed into a pipeline-like structure, a gap 4 is formed between the stranded layer closest to the inner heat insulation layer and the inner heat insulation layer (the stranded layer closest to the inner heat insulation layer and the inner heat insulation layer can be in local contact in the cross section, but most parts are separated and provided with the gap 4), and air at the gap 4 is used for heat insulation, so that the double heat insulation effect is achieved, and the heat of the outer conductive layer group is transmitted to the inside of the outer conductive layer group to be emitted outwards as much as possible. Except the stranded layer closest to the inner heat insulation layer, adjacent round wires of other stranded layers are in line contact, the contact (or sealing) part is smaller, the gap is larger, and heat generated by the molded line of the stranded layer closest to the inner heat insulation layer is radiated outwards.
The conductor shielding layer 4 wraps the outer conductive layer group; the conductor shielding layer 4 can be used for homogenizing an electric field, avoiding the abrupt change of the electric field on an interface so as to break through the insulating sheath 5, and simultaneously playing roles of shielding and grounding.
The insulating sheath 5 wraps the conductor shielding layer 4, the insulating sheath 5 is made of a silicon rubber material, the insulating sheath 5 can protect a cable from mechanical damage, and the cable is high-temperature-resistant, and the service temperature can reach 180 ℃.
As a preferable mode, part of metal monofilaments or all metal monofilaments of the stranded layer closest to the inner heat insulation layer are high-strength aluminum-clad steel wires, so that the overall tensile strength can be improved, and the line requirement can be met. Between the stranded layer farthest from the inner heat insulation layer and the stranded layer nearest to the inner heat insulation layer, the metal monofilaments 3 which can have two stranded layers are all aluminum-clad steel wires; or the metal monofilaments 3 of one stranding layer are all aluminum coated steel wires, and the metal monofilaments 3 of the other stranding layer are all heat-resistant aluminum alloys.
As a preferred embodiment, the metal filaments 3 of the twisted layer closest to the inner insulation layer are made of a heat-resistant aluminum alloy.
In addition, the metal monofilament 3 can be replaced by high-strength heat-resistant aluminum alloy, so that the span range between the towers of the line applicable to the wires can be effectively increased, the number of the towers used can be reduced when the wire is used for a new line, and the engineering cost is reduced.
Further, the wall thickness of the sleeve 11 is 0.2mm-0.8mm, and the sleeve is made of a high-temperature-resistant nonmetallic insulating material. And the tensile strength of the sleeve 11 is greater than 90Mpa, so that the overall tensile strength of the optical fiber composite compatibilized conductor can be improved, and the erected tower can be reduced. The sleeve 11 has a lateral pressure resistance of more than 1000N/10cm and is not damaged when being extruded by the inner heat insulation layer and the outer conductive layer group.
Further, the outer diameter of the insulated light unit 1 is 3.5 mm-8 mm, so that more colored optical fibers 13 can be accommodated in the insulated light unit, and the communication capability is improved.
The outer conductive layer is formed by twisting at least two layers of heat-resistant aluminum alloy wires instead of conventional electrical aluminum wires, so that the requirement of high-temperature safety strength can be met, the polyurethane foam 2 separates the central insulating light unit 1 from the heat-resistant aluminum alloy wires of the outer conductive layer, and heat transfer to the insulating light unit 1 can be effectively reduced; moreover, the sleeve 11 is made of insulating heat-resistant material, and meets the condition of line capacity expansion. The utility model can effectively prevent the temperature of the colored optical fiber 13 from being too high to influence the communication quality through the multiple insurances of heat insulation of the polyurethane foam 2, air heat insulation at the gap 4 between the polyurethane foam 2 and the molded line of the stranded layer closest to the inner heat insulation layer, high temperature resistance of the sleeve 11 and convenient heat dissipation of the round line of the outer layer, and the optical fiber composite compatibilizing conductor with the structure can not only meet the increasing transmission capacity improvement requirement, but also meet the use requirements of line communication monitoring and the like. The utility model is applied to the compatibilized overhead insulated cable, has large current-carrying capacity and is beneficial to the cable compatibilization.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the utility model and is not intended to limit the utility model, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the utility model are intended to be included within the scope of the utility model.
Claims (10)
1. The utility model provides a volume-increasing overhead insulated cable suitable for voltage class below city 20kV, its characterized in that includes from interior to outer optic fibre complex increase Rong Daoti, conductor shielding layer and the insulating sheath that sets up, wherein:
The optical fiber composite compatibilizing conductor comprises an insulating light unit, an inner heat insulation layer and an outer conductive layer group which are sequentially arranged from inside to outside, wherein the insulating light unit comprises a sleeve, water-blocking ointment and colored optical fibers grouped by chromatograph, the colored optical fibers are positioned in the sleeve, the water-blocking ointment is filled between the colored optical fibers and the sleeve, and the sleeve is made of ethylene-tetrafluoroethylene or polyether-ether-ketone;
The inner heat insulation layer is made of polyurethane foam with the thickness of 2-3 mm, and the polyurethane foam wraps the insulating light unit;
For the outer conductive layer group, the outer conductive layer group comprises 2-4 stranded layers which are sequentially arranged from inside to outside, each stranded layer is formed by stranding metal monofilaments, each metal monofilament of the stranded layer closest to the inner heat insulation layer is a molded line, and a gap exists between the stranded layer closest to the inner heat insulation layer and the inner heat insulation layer so as to insulate heat by using air at the gap; except the stranded layer closest to the inner heat insulation layer, each metal monofilament of each other stranded layer is a round wire and is made of heat-resistant aluminum alloy;
the conductor shielding layer wraps the outer conductive layer group;
The insulating sheath wraps the conductor shielding layer, and the insulating sheath is made of a silicon rubber material.
2. The compatibilized overhead insulated cable of claim 1, suitable for use in voltage classes below 20kV in cities, wherein a portion of or all of the metallic filaments of the stranded layer closest to the inner insulation layer are of high strength aluminum clad steel wire to accommodate the tensile strength requirements of different wires.
3. The compatibilized overhead insulated cable of claim 1, wherein the metallic filaments of the stranded layer closest to the inner insulation layer are made of a heat resistant aluminum alloy.
4. A compatibilized overhead insulated cable suitable for use in voltage classes below urban 20kV as claimed in claim 3, characterized in that the cross-sectional shape of each metal monofilament of heat-resistant aluminium alloy of the stranded layer closest to the inner insulation layer is trapezoidal or fanned annular.
5. The compatibilized overhead insulated cable of claim 1, suitable for use in voltage classes below urban 20kV, wherein the metallic monofilaments of the stranded layer nearest the inner insulation layer have a trapezoidal or SZ-shaped cross section.
6. The capacity-increasing overhead insulated cable suitable for use in voltage levels below 20kV in cities according to claim 1, wherein the number of colored optical fibers of the insulated light unit is not less than 24.
7. The capacity-increasing overhead insulated cable suitable for use in voltage classes below 20kV in cities according to claim 1, wherein the outside diameter of the insulated light unit is 3.5mm to 8mm.
8. The capacity-increasing overhead insulated cable suitable for use in voltage levels below 20kV in cities of claim 1, wherein the wall thickness of the sleeve is between 0.2mm and 0.8mm.
9. The capacity-increasing overhead insulated cable suitable for use in voltage levels below 20kV in cities of claim 1, wherein the tensile strength of the jacket is greater than 90Mpa.
10. The capacity-increasing overhead insulated cable suitable for use in voltage levels below 20kV in cities of claim 1, wherein the jacket has a lateral pressure resistance greater than 1000N/10cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322653739.XU CN220873301U (en) | 2023-09-28 | 2023-09-28 | Capacity-increasing overhead insulated cable suitable for voltage class below 20kV in city |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322653739.XU CN220873301U (en) | 2023-09-28 | 2023-09-28 | Capacity-increasing overhead insulated cable suitable for voltage class below 20kV in city |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220873301U true CN220873301U (en) | 2024-04-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322653739.XU Active CN220873301U (en) | 2023-09-28 | 2023-09-28 | Capacity-increasing overhead insulated cable suitable for voltage class below 20kV in city |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220873301U (en) |
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2023
- 2023-09-28 CN CN202322653739.XU patent/CN220873301U/en active Active
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