CN111599527A - Railway long-distance symmetrical communication cable with high shielding performance - Google Patents
Railway long-distance symmetrical communication cable with high shielding performance Download PDFInfo
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- CN111599527A CN111599527A CN202010614180.8A CN202010614180A CN111599527A CN 111599527 A CN111599527 A CN 111599527A CN 202010614180 A CN202010614180 A CN 202010614180A CN 111599527 A CN111599527 A CN 111599527A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B11/00—Communication cables or conductors
- H01B11/02—Cables with twisted pairs or quads
- H01B11/06—Cables with twisted pairs or quads with means for reducing effects of electromagnetic or electrostatic disturbances, e.g. screens
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B11/00—Communication cables or conductors
- H01B11/02—Cables with twisted pairs or quads
- H01B11/06—Cables with twisted pairs or quads with means for reducing effects of electromagnetic or electrostatic disturbances, e.g. screens
- H01B11/10—Screens specially adapted for reducing interference from external sources
- H01B11/1025—Screens specially adapted for reducing interference from external sources composed of a helicoidally wound tape-conductor
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
- H01B3/441—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from alkenes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
- H01B7/20—Metal tubes, e.g. lead sheaths
- H01B7/205—Metal tubes, e.g. lead sheaths composed of aluminium
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
- H01B7/22—Metal wires or tapes, e.g. made of steel
- H01B7/226—Helicoidally wound metal wires or tapes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
- H01B7/282—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/29—Protection against damage caused by extremes of temperature or by flame
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Insulated Conductors (AREA)
Abstract
The invention discloses a railway long-distance symmetrical communication cable with high shielding performance, which sequentially comprises a cable core, a belting layer, a heat insulation layer, a belting layer, an aluminum sheath, an inner lining layer, an armor layer and an outer sheath from inside to outside; the armor layer comprises a high-permeability galvanized steel strip, and the maximum value of the relative permeability of the high-permeability galvanized steel strip is not less than 750. The cable has excellent ideal shielding coefficient, can better shield external electromagnetic field interference from other factors such as electric railway power cables, signal cables and the like, and enhances the safety and reliability of railway communication.
Description
Technical Field
The invention relates to the field of cables, in particular to a railway long-distance symmetrical communication cable with high shielding performance.
Background
The existing railway long-distance symmetrical communication cable consists of a cable core, a belting layer, a heat insulation layer, a belting layer, an aluminum sheath, an inner liner, an armor layer and an outer sheath. An aluminum sheath of the conventional cable is an argon arc welding aluminum pipe, and the nominal thickness is 1.8 mm; the armor layer is wrapped by double-layer galvanized steel strips in a clearance wrapping mode, the nominal thickness of the steel strips is 0.5mm, and the overlapping rate is 50%; the standard specifies that the ideal shielding coefficient of the cable is less than or equal to 0.1 under the power frequency of 50Hz 30-150V/km.
The ideal shielding coefficient of the cable is the shielding coefficient when the grounding resistance of a cable metal sheath (comprising a metal sheath and an armor layer) is equal to zero, the cable metal sheath is grounded and can shield external electromagnetic field interference of other factors such as an electric power cable and a signal cable of an alternating current electrified railway trunk line, the smaller the ideal shielding coefficient index is, the better the ideal shielding coefficient index is, the stronger the external electromagnetic interference resistance of the cable is, and the higher the safety and reliability of railway communication are. In order to improve the anti-electromagnetic field interference performance of the railway long-distance symmetrical communication cable, the ideal shielding coefficient index of the cable needs to be reduced.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a railway long-distance symmetrical communication cable with high shielding performance. The cable has excellent ideal shielding coefficient, can better shield external electromagnetic field interference from other factors such as electric railway power cables, signal cables and the like, and enhances the safety and reliability of railway communication.
In order to achieve the purpose, the invention provides the following technical scheme:
a railway long-distance symmetrical communication cable with high shielding performance sequentially comprises a cable core, a belting layer, a heat insulation layer, a belting layer, an aluminum sheath, an inner lining layer, an armor layer and an outer sheath from inside to outside; the armor layer comprises a high-permeability galvanized steel strip, and the maximum value of the relative permeability of the high-permeability galvanized steel strip is not less than 750.
Optionally, the high permeability galvanized steel strip is made of an electromagnetic pure iron galvanized material.
Optionally, the armor layer is formed by wrapping a layer of high-permeability galvanized steel strip and a layer of galvanized steel strip in a gap wrapping mode, the thickness of the steel strip is not less than 0.5mm, the width of the steel strip is 25 mm-40 mm, and the wrapping gap is not greater than 50% of the width of the steel strip.
Optionally, the armor layer is formed by wrapping two layers of high-permeability galvanized steel strips in a gap wrapping mode, the thickness of each steel strip is not less than 0.5mm, the width of each steel strip is 25-40 mm, and the wrapping gap is not more than 50% of the width of each steel strip.
Optionally, the shielding coefficient of the cable at 50Hz of 30-150V/km is 0.02-0.05.
Optionally, the cable core is formed by twisting four wire groups and insulated single wires;
the wrapping tape layer is formed by overlapping and wrapping a polyester tape layer and a water-blocking tape layer, and the overlapping rate is not lower than 15%.
Optionally, the thermal insulation layer is extruded from a layer of polyethylene material, and the thickness of the thermal insulation layer is not less than 1.0 mm.
Optionally, the wrapping tape layer is formed by overlapping and wrapping a layer of water-blocking tape, and the overlapping rate is not lower than 15%.
Optionally, the aluminum sheath is formed by drawing an aluminum strip after argon arc welding, and the thickness of the aluminum strip is not less than 1.8 mm.
Optionally, the inner liner is extruded from a polyethylene sheath material or a halogen-free low-smoke flame-retardant polyolefin sheath material;
the outer sheath is made of a polyethylene sheath material or a halogen-free low-smoke flame-retardant polyolefin sheath material through extrusion.
Compared with the prior art, the invention has the following advantages:
the invention relates to a railway long-distance symmetrical communication cable with high shielding performance, which adopts a gap-wrapped layer of high-permeability galvanized steel strip and a layer of galvanized steel strip, wherein the wrapping gap is not more than 50% of the width of the steel strip; or two layers of high-permeability galvanized steel strips are wound in a gap mode, and the winding gap is not larger than 50% of the width of the steel strips. The maximum value of the relative magnetic conductivity of the high magnetic conductivity galvanized steel strip is not less than 750, and the 50Hz30-150V/km shielding coefficient of the cable can reach 0.02-0.05. The relative magnetic permeability of the common galvanized steel strip is 150-400, the shielding coefficient of the cable at 50Hz of 30-150V/km is 0.08-0.1, and the capacity of resisting the interference of an external electromagnetic field is greatly improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a graph of the relative permeability of the present invention.
Reference numbers in the figures: 1 cable core, 2 band layers, 3 insulating layers, 4 band layers, 5 aluminum sheaths, 6 inner liners, 7 armor layers and 8 outer sheaths.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The technical problem to be solved by the invention is to provide a railway long-distance symmetrical communication cable with high shielding performance, and the long-distance symmetrical communication cable improves the relative permeability of an armor layer, reduces an ideal shielding coefficient and improves the capacity of resisting external electromagnetic field interference of the cable by adjusting the relative permeability of the armor layer structure and materials.
The invention relates to a railway long-distance symmetrical communication cable with high shielding performance, which sequentially comprises a cable core 1, a belting layer 2, a heat insulation layer 3, a belting layer 4, an aluminum sheath 5, an inner lining layer 6, an armor layer 7 and an outer sheath 8 from inside to outside.
The armor layer 7 is formed by wrapping a layer of high-permeability galvanized steel strip and a layer of galvanized steel strip in a gap wrapping mode, and the wrapping gap is not larger than 50% of the width of the steel strip; alternatively, the first and second electrodes may be,
the armor layer 7 is formed by wrapping two layers of high-permeability galvanized steel strips in a gap wrapping mode, and the wrapping gap is not larger than 50% of the width of the steel strips;
the armor layer 7 is formed by galvanizing electromagnetic pure iron by adopting a high-permeability galvanized steel strip, the maximum value of the relative permeability is not less than 750, the 50Hz30-150V/km shielding coefficient of the cable can reach 0.02-0.05, and the capacity of resisting the interference of an external electromagnetic field is greatly improved.
The ideal shielding coefficient γ is calculated as follows:
the main influencing factors of the shielding coefficient gamma include the magnetic field omega and the external inductance LeThe average diameter D of the steel belt layer, the number n of steel belt layers are related to the thickness of the steel belt, the gap delta of the steel belt, the width a of the steel belt and the magnetic permeability mu of the steel belt. The frequency ω and the external influence L are constants, and the adjustment of the average diameter D of the steel strip layer, the number n of steel strip layers, the thickness of the steel strip, the gap between the steel strips, and the width a of the steel strip may affect the ideal shielding coefficient γ, but the influence is slight, and the cost increase is large.
Because a layer of high-permeability galvanized steel strip and a layer of galvanized steel strip are wound in a gap winding manner, the winding gap is not more than 50% of the width of the steel strip; or two layers of high-permeability galvanized steel strips are wound in a gap mode, and the winding gap is not larger than 50% of the width of the steel strips. The maximum value of the relative permeability of the high-permeability galvanized steel strip is not less than 750, the relative permeability curve of the railway long-distance symmetrical communication cable with high shielding performance prepared by the invention is shown in figure 2, and the shielding coefficient of the cable at 50Hz30-150V/km can reach 0.02-0.05.
The relative magnetic permeability of the common galvanized steel strip is 150-400, the shielding coefficient of the cable at 50Hz of 30-150V/km is 0.08-0.1, and the capacity of resisting the interference of an external electromagnetic field is greatly improved.
The material and thickness requirements of other layers of the railway long distance symmetrical communication cable are as follows:
the cable core 1 is formed by twisting four wire groups and insulated single wires.
The wrapping tape layer 2 is formed by overlapping and wrapping a polyester tape layer and a water-blocking tape layer, and the overlapping rate is not lower than 15%.
The heat insulation layer 3 is formed by extruding a layer of polyethylene material, and the thickness of the heat insulation layer is not less than 1.0 mm.
The wrapping tape layer 4 is formed by overlapping and wrapping a layer of water-blocking tape, and the overlapping rate is not lower than 15%.
The aluminum sheath 5 is formed by drawing an aluminum strip after argon arc welding, and the thickness of the aluminum strip is not less than 1.8 mm.
The inner liner 6 is formed by extruding a polyethylene sheath material or a halogen-free low-smoke flame-retardant polyolefin sheath material.
The outer sheath 8 is made of a polyethylene sheath material or a halogen-free low-smoke flame-retardant polyolefin sheath material by extrusion.
The invention has excellent ideal shielding coefficient through structural improvement, can better shield external electromagnetic field interference from other factors such as electric power cables, signal cables and the like of the electrified railway, and enhances the safety and reliability of railway communication.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A railway long-distance symmetrical communication cable with high shielding performance is characterized in that: the cable comprises a cable core (1), a belting layer (2), a heat insulation layer (3), a belting layer (4), an aluminum sheath (5), an inner liner layer (6), an armor layer (7) and an outer sheath (8) from inside to outside in sequence; the armor layer (7) comprises a high-permeability galvanized steel strip, and the maximum value of the relative permeability of the high-permeability galvanized steel strip is not less than 750.
2. A railway long distance symmetric communication cable with high shielding performance according to claim 1, wherein: the high-permeability galvanized steel strip is made of an electromagnetic pure iron galvanized material.
3. A railway long distance symmetric communication cable with high shielding performance according to claim 1, wherein: the armor layer (7) adopts a gap to wrap a layer of high-permeability galvanized steel strip and a layer of galvanized steel strip, the thickness of the steel strip is not less than 0.5mm, the width of the steel strip is 25 mm-40 mm, and the wrapping gap is not more than 50% of the width of the steel strip.
4. A railway long distance symmetric communication cable with high shielding performance according to claim 1, wherein: the armor layer (7) adopts two layers of high magnetic conduction galvanized steel strips wound in a gap mode, the thickness of each steel strip is not less than 0.5mm, the width of each steel strip is 25-40 mm, and the winding gap is not more than 50% of the width of each steel strip.
5. A railway long distance symmetric communication cable with high shielding performance according to claim 1, wherein: the shielding coefficient of the cable at 50Hz of 30-150V/km is 0.02-0.05.
6. A railway long distance symmetric communication cable with high shielding performance according to claim 1, wherein: the cable core (1) is formed by twisting four wire groups and insulated single wires;
the wrapping tape layer (2) is formed by overlapping and wrapping a polyester tape layer and a water-blocking tape layer, and the overlapping rate is not lower than 15%.
7. A railway long distance symmetric communication cable with high shielding performance according to claim 1, wherein: the heat insulation layer (3) is formed by extruding a layer of polyethylene material, and the thickness of the heat insulation layer is not less than 1.0 mm.
8. A railway long distance symmetric communication cable with high shielding performance according to claim 1, wherein: the wrapping tape layer (4) is formed by overlapping and wrapping a layer of water-blocking tape, and the overlapping rate is not lower than 15%.
9. A railway long distance symmetric communication cable with high shielding performance according to claim 1, wherein: the aluminum sheath (5) is formed by drawing an aluminum strip after argon arc welding, and the thickness of the aluminum strip is not less than 1.8 mm.
10. A railway long distance symmetric communication cable with high shielding performance according to claim 1, wherein: the inner liner (6) is formed by extruding a polyethylene sheath material or a halogen-free low-smoke flame-retardant polyolefin sheath material;
the outer sheath (8) is formed by extruding a polyethylene sheath material or a halogen-free low-smoke flame-retardant polyolefin sheath material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010614180.8A CN111599527A (en) | 2020-06-30 | 2020-06-30 | Railway long-distance symmetrical communication cable with high shielding performance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010614180.8A CN111599527A (en) | 2020-06-30 | 2020-06-30 | Railway long-distance symmetrical communication cable with high shielding performance |
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| Publication Number | Publication Date |
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| CN111599527A true CN111599527A (en) | 2020-08-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010614180.8A Pending CN111599527A (en) | 2020-06-30 | 2020-06-30 | Railway long-distance symmetrical communication cable with high shielding performance |
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| Country | Link |
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| CN (1) | CN111599527A (en) |
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2020
- 2020-06-30 CN CN202010614180.8A patent/CN111599527A/en active Pending
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