CN112635119A - B1-grade flame-retardant ultra-low-dropping electrified railway 27.5kV cable - Google Patents
B1-grade flame-retardant ultra-low-dropping electrified railway 27.5kV cable Download PDFInfo
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- CN112635119A CN112635119A CN202110054934.3A CN202110054934A CN112635119A CN 112635119 A CN112635119 A CN 112635119A CN 202110054934 A CN202110054934 A CN 202110054934A CN 112635119 A CN112635119 A CN 112635119A
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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
- H01B7/295—Protection against damage caused by extremes of temperature or by flame using material resistant to flame
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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
- H01B7/02—Disposition of insulation
- H01B7/0208—Cables with several layers of insulating material
- H01B7/0216—Two layers
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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
- H01B7/02—Disposition of insulation
- H01B7/0275—Disposition of insulation comprising one or more extruded layers of insulation
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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
- H01B7/02—Disposition of insulation
- H01B7/0291—Disposition of insulation comprising two or more layers of insulation having different electrical properties
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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
-
- 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
- H01B7/1875—Multi-layer sheaths
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B9/00—Power cables
- H01B9/02—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients
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Abstract
The invention discloses a B1-grade flame-retardant ultra-low-dropping electrified railway 27.5kV cable which comprises a conductor wire core and an outer sheath, wherein a conductor shielding layer, an insulating shielding layer, a metal shielding layer, an inner lining layer, a non-magnetic metal wire armor layer and a belting layer are sequentially wrapped outside the conductor wire core from inside to outside; the non-magnetic metal wire armor layer is tightly arranged and wound on the outer surface of the lining layer, the non-magnetic metal wire armor layer is fixed through the wrapping tape layer, and the outer sheath is uniformly and tightly wrapped on the surface of the wrapping tape layer. According to the invention, the conductor shielding layer, the insulating shielding layer, the metal shielding layer, the inner liner layer and the nonmagnetic metal wire armor layer are sequentially arranged outside the conductor wire core, then the outer sheath is arranged outside, and the outer sheath is the low-smoke halogen-free high-flame-retardant sheath with the oxygen index larger than 40, so that the anti-dripping effect on the whole structure meets the actual requirement.
Description
Technical Field
The invention relates to the technical field of power cables, in particular to a B1-grade flame-retardant ultra-low-dropping electrified railway 27.5kV cable.
Background
At present, the flame spread, heat release and smoke generation characteristics of the cable under the fire condition are subjected to main classification (GB 31247-. Wherein d is0The dropping requirements are as follows: there were no combustion drips/particles within 1200 s. The new standard considers the safety performance of the cable comprehensively and has higher requirements. At present, the 27.5kV single-phase (to ground) cable of the electrified railway in China cannot meet the requirement d0And (5) dripping requirements. Therefore, the single-phase 27.5kV power cable of the B1-class flame-retardant ultra-low-dropping electrified railway, which meets the d0 dropping requirement, needs to be designed.
Disclosure of Invention
The invention aims to provide a B1-grade flame-retardant ultra-low-dropping electrified railway 27.5kV cable which can meet the requirements of B1-grade flame retardance and d0And (5) dripping requirements.
The technical scheme adopted by the invention is as follows:
a single-phase 27.5kV power cable of a B1-grade flame-retardant ultra-low-dropping electrified railway comprises a conductor wire core and an outer sheath, wherein a conductor shielding layer 2, an insulating layer 3, an insulating shielding layer 4, a metal shielding layer, an inner lining layer, a non-magnetic metal wire armor layer and a belting layer are sequentially wrapped and arranged on the outer side of the conductor wire core from inside to outside; the non-magnetic metal wire armor layer is tightly arranged and wound on the outer surface of the lining layer, the non-magnetic metal wire armor layer is fixed through a wrapping tape layer, the outer sheath is uniformly and tightly wrapped on the surface of the wrapping tape layer, and the outer sheath is a low-smoke halogen-free high-flame-retardant sheath with the oxygen index larger than 40.
Set up the buffer layer between metal shielding layer and the conductor sinle silk, the buffer layer adopt semiconduction to wrap the covering.
The conductor wire core is formed by twisting a plurality of metal wires in opposite directions according to the adjacent layers, and the outermost layer is arranged in the left direction.
The conductor wire core is a cylindrical compacted copper conductor.
The conductor shielding layer, the insulating layer and the insulating shielding layer are sequentially and closely coated on the surface of the conductor wire core in a co-extrusion manner.
The insulating layer is a cross-linked polyethylene insulating layer which takes polyethylene as a base material and takes peroxide as a cross-linking agent.
The insulating shielding layer is an insulating shielding layer taking polyolefin as a base material.
The metal shielding layer is composed of soft copper wires and copper strips, the surfaces of the copper wires are reversely fastened by the copper strips,
the wrapping tape layer adopts a low-smoke halogen-free flame-retardant tape.
The inner liner layer is made of PE or low-smoke halogen-free materials, and the inner liner layer is evenly and tightly extruded on the surface of a wrapping tape on the outer side of the metal shielding layer.
According to the invention, the conductor shielding layer, the insulating shielding layer, the metal shielding layer, the inner liner layer and the nonmagnetic metal wire armor layer are sequentially arranged outside the conductor wire core, then the outer sheath is arranged outside, and the outer sheath is the low-smoke halogen-free high-flame-retardant sheath with the oxygen index larger than 40, so that the anti-dripping effect on the whole structure meets the actual requirement.
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 cross-sectional structure of the present invention.
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 obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
As shown in fig. 1, the invention comprises a conductor wire core 1 and an outer sheath 9, wherein the outer side of the conductor wire core 1 is sequentially wrapped with a conductor shielding layer 2, an insulating layer 3, an insulating shielding layer 4, a metal shielding layer 5, an inner liner layer 6, a non-magnetic metal wire armor layer 7 and a belting layer 8 from inside to outside; the non-magnetic metal wire armor layer 7 is tightly arranged and wound on the outer surface of the inner liner 6, the non-magnetic metal wire armor layer 7 is fixed through a wrapping tape layer 8, the outer sheath 9 is uniformly and tightly wrapped on the surface of the wrapping tape layer 8, a buffer layer is arranged between the metal shielding layer 5 and the conductor wire core 1, and the buffer layer is a semi-conductive wrapping layer. The lining layer 6 is tightly extruded on the wrapping tape outside the metal shielding layer 5.
According to the invention, the conductor shielding layer 2, the insulating layer 3, the insulating shielding layer 4, the metal shielding layer 5, the inner liner layer 6 and the nonmagnetic metal wire armor layer 7 are sequentially arranged outside the conductor wire core, then the outer sheath is arranged outside, and the outer sheath 9 is a low-smoke halogen-free high-flame-retardant sheath with the oxygen index larger than 40, so that the anti-dripping effect on the whole structure meets the actual requirement.
The conductor core 1 is formed by twisting a plurality of copper wires, preferably, the outermost layer of the plurality of copper wires is twisted in the left direction, namely, the conductor core 1 is formed by twisting a plurality of metal wires in the opposite directions according to the adjacent layers, and the outermost layer is arranged in the left direction. The arrangement can enable the conductor to be wound more tightly and not to be loosened easily.
The conductor wire core 1 is a cylindrical compacted copper conductor.
The conductor shielding layer 2, the insulating layer 3 and the insulating shielding layer 4 are co-extruded to be sequentially and tightly coated on the surface of the conductor wire core 1. The nominal thickness of the conductor shielding layer 2 is 1.0mm, and the nominal thickness of the insulating layer 3 is 11 mm; the average thickness of the insulating layer 3 is not less than the nominal thickness, and the thinnest point at any position is not less than 90-0.1 mm of the nominal value. This arrangement ensures the electrical insulation performance of the cable.
The insulating layer 3 is a cross-linked polyethylene insulating layer which takes polyethylene as a base material and takes peroxide as a cross-linking agent. The insulation shielding layer 4 is an insulation shielding layer using polyolefin as a base material. This provides an insulating layer to protect the cable.
The semi-conductive lapping rate of the tape outside the conductor wire core 1 is not less than 10%, the metal shielding layer 5 is composed of a soft copper wire and a copper strip group layer, the surface of the copper wire is reversely fastened by the copper strip, the metal shielding layer 5 is composed of the soft copper wire and the copper strip, the short-circuit current requirement can be met according to the size of current and voltage borne by the cable, the metal shielding layer 5 is shielded by the copper strip of the copper wire, the pitch is not more than 10 times of the diameter of the copper wire, and the copper strip is always in contact with the wire core. The average gap between adjacent copper wires is not more than 4, and the gap between any two adjacent copper wires is not more than 8 mm. The copper strip is reversely inserted with the thickness of 1.0mm, and the copper wire and the copper strip meet the requirement of short-circuit current. The inner liner layer 6 is made of PE or low-smoke halogen-free material, and the inner liner layer is uniformly and tightly extruded on the surface of a wrapping tape outside the metal shielding layer
The nonmagnetic metal wire armor layer 7 is formed by tightly winding nonmagnetic metal wires on the outer surface of the inner liner layer 6, so that the cable can be prevented from heating and reducing the current-carrying condition due to overlarge eddy current loss, and can bear certain short-circuit current. The wrapping tape layer 8 adopts a low-smoke halogen-free flame-retardant tape, the wrapping tape layer 8 is a three-layer wrapping tape,
the overlapping rate is not less than 25%.
The outer sheath material is low smoke halogen-free material, the nominal thickness is 2.7mm, the thinnest point is not less than 85-0.1 mm of the nominal value, and in order to meet the requirement of ultra-low dripping, the lining layer 6 and the outer sheath 9 can be made of high flame-retardant crusting materials with good performance. According to the using environment and requirements, the cable is a low-smoke halogen-free flame-retardant cable.
In the description of the present invention, it is to be noted that, for the orientation words, there are terms such as "center", "lateral", "longitudinal", and the like
The terms "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used to designate an orientation or positional relationship that is based on the orientation or positional relationship shown in the drawings for purposes of descriptive convenience and simplicity of description, and are not intended to indicate or imply that the device or element so designated must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the specific scope of the invention.
It is noted that the terms "first", "second", and the like in the description and claims of the present application are used for
Similar objects are distinguished and not necessarily used to describe a particular order or sequence. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the application of the principles of the technology. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the specific embodiments described herein, and may include more effective embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A B1-grade flame-retardant ultra-low-dropping electrified railway 27.5kV cable is characterized in that: the cable comprises a conductor wire core and an outer sheath, wherein a conductor shielding layer, an insulating shielding layer, a metal shielding layer, an inner lining layer, a non-magnetic metal wire armor layer and a belting layer are sequentially wrapped on the outer side of the conductor wire core from inside to outside; the non-magnetic metal wire armor layer is tightly arranged and wound on the outer surface of the lining layer, the non-magnetic metal wire armor layer is fixed through a wrapping tape layer, the outer sheath is uniformly and tightly wrapped on the surface of the wrapping tape layer, and the outer sheath is a low-smoke halogen-free high-flame-retardant sheath with the oxygen index larger than 40.
2. The B1-grade flame retardant ultra-low drip electrified railway 27.5kV cable of claim 1, wherein: set up the buffer layer between metal shielding layer and the conductor sinle silk, the buffer layer adopt semiconduction to wrap the covering.
3. The B1-grade flame retardant ultra-low drip electrified railway 27.5kV cable of claim 1, wherein: the conductor wire core is formed by twisting a plurality of metal wires in opposite directions according to the adjacent layers, and the outermost layer is arranged in the left direction.
4. The B1-grade flame-retardant ultra-low-drip electrified railway 27.5kV cable of claim 3, wherein: the conductor wire core is a cylindrical compacted copper conductor.
5. The B1-grade flame retardant ultra-low drip electrified railway 27.5kV cable of claim 1, wherein: the conductor shielding layer, the insulating layer and the insulating shielding layer are sequentially and closely coated on the surface of the conductor wire core in a co-extrusion manner.
6. The B1-grade flame-retardant ultra-low-dropout electrified railway 27.5kV cable of claim 1, wherein the insulating layer is a crosslinked polyethylene insulating layer based on polyethylene and oxidized with a crosslinking agent.
7. The B1-grade flame retardant ultra-low drip electrified railway 27.5kV cable of claim 1, wherein: the insulating shielding layer is an insulating shielding layer taking polyolefin as a base material.
8. The B1-grade flame retardant ultra-low drip electrified railway 27.5kV cable of claim 1, wherein: the metal shielding layer is composed of a soft copper wire and a copper strip, and the surface of the copper wire is reversely fastened by the copper strip.
9. The B1-grade flame retardant ultra-low drop electrified railway 27.5kV cable of any one of claims 1-8, wherein: the wrapping tape layer adopts a low-smoke halogen-free flame-retardant tape.
10. The B1-grade flame retardant ultra-low drip electrified railway 27.5kV cable of claim 9, wherein: the inner liner layer is made of PE or low-smoke halogen-free materials, and the inner liner layer is evenly and tightly extruded on the surface of a wrapping tape on the outer side of the metal shielding layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110054934.3A CN112635119A (en) | 2021-01-15 | 2021-01-15 | B1-grade flame-retardant ultra-low-dropping electrified railway 27.5kV cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110054934.3A CN112635119A (en) | 2021-01-15 | 2021-01-15 | B1-grade flame-retardant ultra-low-dropping electrified railway 27.5kV cable |
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| Publication Number | Publication Date |
|---|---|
| CN112635119A true CN112635119A (en) | 2021-04-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110054934.3A Pending CN112635119A (en) | 2021-01-15 | 2021-01-15 | B1-grade flame-retardant ultra-low-dropping electrified railway 27.5kV cable |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201532808U (en) * | 2009-09-28 | 2010-07-21 | 青岛汉缆股份有限公司 | Single-phase 27.5kV electric power cable of electrified railway |
| CN204991173U (en) * | 2015-08-06 | 2016-01-20 | 新亚特电缆股份有限公司 | Electric Railway cable |
| CN208689973U (en) * | 2018-06-19 | 2019-04-02 | 尚纬股份有限公司 | A kind of fire-retardant 1 grade of B1 cable of wrapped metal tape fire lagging |
| CN208861718U (en) * | 2018-10-25 | 2019-05-14 | 江苏亨通电力电缆有限公司 | B1 grades of environmentally protective medium-pressure power cables of multistoried building |
| CN210295995U (en) * | 2019-08-15 | 2020-04-10 | 江苏亨通电力电缆有限公司 | High-flame-retardant green environment-friendly cable for B1-grade electrified railway |
| CN211045115U (en) * | 2019-12-20 | 2020-07-17 | 航天瑞奇电缆有限公司 | Super A-class halogen-free low-smoke flame-retardant low-voltage power cable passing B1-grade combustion test |
-
2021
- 2021-01-15 CN CN202110054934.3A patent/CN112635119A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201532808U (en) * | 2009-09-28 | 2010-07-21 | 青岛汉缆股份有限公司 | Single-phase 27.5kV electric power cable of electrified railway |
| CN204991173U (en) * | 2015-08-06 | 2016-01-20 | 新亚特电缆股份有限公司 | Electric Railway cable |
| CN208689973U (en) * | 2018-06-19 | 2019-04-02 | 尚纬股份有限公司 | A kind of fire-retardant 1 grade of B1 cable of wrapped metal tape fire lagging |
| CN208861718U (en) * | 2018-10-25 | 2019-05-14 | 江苏亨通电力电缆有限公司 | B1 grades of environmentally protective medium-pressure power cables of multistoried building |
| CN210295995U (en) * | 2019-08-15 | 2020-04-10 | 江苏亨通电力电缆有限公司 | High-flame-retardant green environment-friendly cable for B1-grade electrified railway |
| CN211045115U (en) * | 2019-12-20 | 2020-07-17 | 航天瑞奇电缆有限公司 | Super A-class halogen-free low-smoke flame-retardant low-voltage power cable passing B1-grade combustion test |
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