CN111430064B - Single-phase alternating current intelligent monitoring cable for railway and production process thereof - Google Patents
Single-phase alternating current intelligent monitoring cable for railway and production process thereof Download PDFInfo
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- CN111430064B CN111430064B CN202010258475.6A CN202010258475A CN111430064B CN 111430064 B CN111430064 B CN 111430064B CN 202010258475 A CN202010258475 A CN 202010258475A CN 111430064 B CN111430064 B CN 111430064B
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- H—ELECTRICITY
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- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B9/00—Power cables
- H01B9/005—Power cables including optical transmission elements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/08—Protective devices, e.g. casings
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/14—Supports; Fastening devices; Arrangements for mounting thermometers in particular locations
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
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- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/02—Stranding-up
- H01B13/0207—Details; Auxiliary devices
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- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/06—Insulating conductors or cables
- H01B13/14—Insulating conductors or cables by extrusion
- H01B13/141—Insulating conductors or cables by extrusion of two or more insulating layers
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- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
- H01B13/24—Sheathing; Armouring; Screening; Applying other protective layers by extrusion
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- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
- H01B13/26—Sheathing; Armouring; Screening; Applying other protective layers by winding, braiding or longitudinal lapping
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- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/0009—Details relating to the conductive cores
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- 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
- 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
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- H—ELECTRICITY
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- 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
- H01B9/025—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients composed of helicoidally wound wire-conductors
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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
- H01B9/027—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients composed of semi-conducting layers
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Abstract
The invention discloses a single-phase alternating current intelligent monitoring cable for a railway, which comprises a conductor, a conductor shielding layer, an insulating shielding layer, an inner sheath, a low-smoke halogen-free flame-retardant wrapping tape, a metal wire armor layer, a flame-retardant glass fiber tape and a sheath, which are sequentially arranged from inside to outside; the inner sheath is of a double-layer structure and comprises an elastic semi-conducting layer and a medium-density polyethylene layer which are sequentially arranged outside the insulating shielding layer, and a metal shielding layer embedded between the semi-conducting layer and the medium-density polyethylene; the detection optical fiber comprises a first detection optical fiber arranged in the center of the conductor. According to the invention, the detection optical fiber is distributed in the center of the conductor, so that the temperature of the conductor is effectively detected, the service life of the cable is evaluated, and the accurate detection of the temperature is realized; through setting up double-deck inner sheath to imbed the metallic shield layer in the centre, guaranteed the good contact between metallic shield layer and the semi-conducting layer, improved the electric property of cable.
Description
Technical Field
The invention relates to the field of cable manufacturing, in particular to a railway single-phase alternating current intelligent monitoring cable and a production process thereof.
Background
The development of the electrified railway in China is rapid, the high-speed railway technology is in the leading position, the design speed is faster and faster, high-speed trains above 300km/h are popularized and used, the train dispatching is very intensive, the power supply safety of 27.5kV single-phase alternating-current cables for supplying power to contact networks is more and more important to the nation and the industry, the technical requirements on the cables are continuously updated and improved, and the service life and the operation maintenance of the cables under different working conditions are lack of direct and effective means.
Therefore, there is a need for a cable that can effectively detect cable usage, assess cable life, and improve operational maintenance efficiency.
Disclosure of Invention
The invention aims to provide a railway single-phase alternating current intelligent monitoring cable and a production process thereof, and solves the problem that the conventional railway cable is short in service life and operation and maintenance under different working conditions.
A railway single-phase alternating current intelligent monitoring cable comprises a conductor, a conductor shielding layer, an insulating shielding layer, an inner sheath, a low-smoke halogen-free flame-retardant wrapping tape, a metal wire armor layer, a flame-retardant glass fiber tape and a sheath which are sequentially arranged from inside to outside; the inner sheath is of a double-layer structure and comprises an elastic semi-conducting layer and a medium-density polyethylene layer which are sequentially arranged outside the insulating shielding layer, and a metal shielding layer embedded between the semi-conducting layer and the medium-density polyethylene; the detection optical fiber comprises a first detection optical fiber arranged in the center of the conductor, at least one pair of second detection optical fibers symmetrically arranged on the metal shielding layer by taking the conductor as the center, and at least one pair of third detection optical fibers symmetrically arranged on the metal wire armor layer by taking the conductor as the center; the detection optical fiber comprises an optical fiber, and a protective sleeve and a polyolefin buffer layer which are arranged outside the optical fiber.
The conductor is a non-compacted structure.
The metal shielding layer comprises a plurality of first shielding copper wires and a plurality of second shielding copper wires; the first shielding copper wires are arranged on two sides of each second detection optical fiber in pairs to form optical fiber protection groups; the second shielding copper wires are arranged between the adjacent optical fiber protection groups; the first shielding copper wire and the second shielding copper wire are different in wire diameter.
The diameter d1 of the first shielding copper wire is larger than the diameter of the second detection optical fiber; the diameter d1 of the first shielding copper wire is larger than the diameter d2 of the second shielding copper wire.
The arrangement of the metal shielding layer meets the condition that S = pi (d 1/2) 2 × n1+ pi (d 2/2) 2 × n2, wherein S is the cross section area of the metal shielding layer, n1 is the number of the first shielding copper wires, n2 is the number of the second shielding copper wires, and n1+ n2 is more than or equal to 12.
The wire armor layer includes many armoured wires, armoured wire external diameter d3 is greater than third detection optical fiber diameter, and armoured wire radical N passes through the formula: n = int (pi x (D + D3) ÷ (D3 x 1.08)) -2, where D is the cable outer diameter before armouring.
The production process of the single-phase alternating current intelligent monitoring cable for the railway is characterized by comprising the following steps of:
step one, manufacturing a conductor: after the copper wire is drawn, arranging the first detection optical fiber in the middle, and twisting the copper wire on the outer side of the first detection optical fiber according to a regular twisting mode to manufacture a conductor;
step two, manufacturing an insulated wire core: arranging a conductor shielding layer, an insulating layer and an insulating shielding layer outside a conductor in a three-layer co-extrusion mode to form an insulating wire core;
step three, extruding and wrapping the inner sheath: extruding an elastic semi-conducting layer outside the insulated wire core, then arranging a metal shielding layer, and extruding a medium-density polyethylene layer;
and step four, preparing a low-smoke halogen-free flame-retardant wrapping tape, a metal wire armor layer, a flame-retardant glass fiber tape and a sheath outside the inner sheath in sequence to prepare the cable.
By adopting the technical scheme, the invention has the following technical effects:
1. according to the invention, the detection optical fiber is distributed in the center of the conductor, so that the temperature of the conductor is effectively detected, the service life of the cable is evaluated, and the accurate detection of the temperature is realized; through setting up double-deck inner sheath to imbed the metallic shield layer in the centre, guaranteed the good contact between metallic shield layer and the semi-conducting layer, improved the electric property of cable.
2. According to the invention, two second detection optical fibers are symmetrically arranged on the metal shielding layer by taking the conductor as the center, and a third detection optical fiber is arranged on the metal wire armor layer, so that the accurate detection of the external disturbance and the partial discharge of the cable is realized, and the accuracy of the service life of the cable is further improved; in addition, the second detection optical fibers distributed in the metal shielding layer are symmetrically distributed, so that the electric field is effectively prevented from being unevenly distributed.
3. The conductor of the invention adopts a non-pressing structure, and can effectively prevent the conductor temperature detection optical fiber at the center of the conductor from being damaged.
4. According to the invention, the polyolefin buffer layer is arranged outside the detection optical fiber, so that the damage to the optical fiber unit during stranding, shielding and armoring is effectively prevented, and the effectiveness of the detection optical fiber is guaranteed.
5. According to the invention, the shielding effect is increased by arranging the copper wires with the first shielding copper wire and the second shielding copper wire.
6. By arranging the first shielding wire with the diameter larger than that of the detection optical fiber, the detection optical fiber is effectively protected from being damaged.
7. According to the invention, the cross section area of the cable is effectively controlled by controlling the quantity of the first shielding copper wires and the second shielding copper wires, and the laying requirement and the power transmission capacity are met.
Drawings
In order that the manner in which the above recited features of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to embodiments, some of which are illustrated in the appended drawings
FIG. 1 is a schematic view of the structure of the present invention;
FIG. 2 is a schematic view of a shielding machine used in the present invention;
fig. 3 is a partial structural diagram of a shielding machine used in the present invention.
The reference numbers are: the cable comprises a conductor 1, a conductor shielding layer 2, an insulating layer 3, an insulating shielding layer 4, an inner sheath 5, an elastic semi-conducting layer 5-1, a medium-density polyethylene layer 5-2, a metal shielding layer 5-3, a first shielding copper wire 5-3-1, a second shielding copper wire 5-3-2, a low-smoke halogen-free flame-retardant wrapping tape 6, a metal wire armor layer 7, a flame-retardant glass fiber tape 8, a sheath 9, a detection optical fiber 10, a first detection optical fiber 10-1, a second detection optical fiber 10-2, a third detection optical fiber 10-3, a pay-off reel 11, a stranding cage 12, a shielding winder 13, a shielding mold 14, a wrapping machine 15, a tractor 16, a meter 17, a take-up reel 18, a shielding winder mold 19, a shielding wire threading hole 19-1, a wire core threading hole 19-2 and a buckle 19-3.
Detailed Description
(example 1)
Referring to fig. 1, the single-phase alternating current intelligent monitoring cable for the railway comprises a conductor 1, a conductor shielding layer 2, an insulating layer 3, an insulating shielding layer 4, an inner sheath 5, a low-smoke halogen-free flame-retardant wrapping tape 6, a metal wire armoring layer 7, a flame-retardant glass fiber tape 8 and a sheath 9 which are sequentially arranged from inside to outside.
The inner sheath 5 is of a double-layer structure and comprises an elastic semi-conducting layer 5-1 and a medium density polyethylene layer 5-2 which are sequentially arranged outside the insulation shielding layer 4, and a metal shielding layer 5-3 which is embedded between the elastic semi-conducting layer 5-1 and the medium density polyethylene layer 5-2; by arranging the double-layer inner sheath and embedding the metal shielding layer 5-3 in the middle, good contact between the metal shielding layer 5-3 and the elastic semi-conducting layer 5-1 is ensured, and the electrical performance of the cable is improved; wherein, the elastic semi-conducting layer 5-1 is a polyolefin elastomer with the thickness of 0.4 to 0.6mm, and the polyolefin elastomer has excellent mechanical and chemical properties and can well protect the shielding metal layer 5-3; the thickness of the medium density polyethylene layer 5-2 is 2.5 to 3.0mm.
Single-phase alternating current intelligent monitoring cable still includes detection optic fibre 10 for the railway, and detection optic fibre 10 includes: the detection device comprises a first detection optical fiber 10-1 arranged in the center of a conductor 1, at least one pair of second detection optical fibers 10-2 symmetrically arranged on a metal shielding layer 5-3 by taking the conductor 1 as the center, and at least one pair of third detection optical fibers 10-3 symmetrically arranged on a metal wire armor layer 8 by taking the conductor 1 as the center; the conductor 1 is a non-pressing structure, and can effectively prevent the first detection optical fiber 10-1 in the center of the conductor from being damaged; by arranging the detection optical fibers 10 on the conductor 1, the metal shielding layers 5-3 and the metal wire armor layer 7, the accurate detection of temperature, external disturbance of the cable and partial discharge is realized, the temperature of the conductor is effectively detected, and the service life of the cable is evaluated; and a plurality of second detection optical fibers 10-2 are symmetrically arranged on the metal shielding layer 5-3 by taking the conductor as the center, so that the uneven distribution of an electric field is effectively prevented.
The detection optical fiber 10 is a single-mode or multi-mode optical fiber, a stainless steel pipe is protected, grease is filled inside the detection optical fiber, the thickness of the stainless steel pipe is 0.1 to 0.2mm, a polyolefin buffer layer with the thickness of about 0.2 to 0.3mm is extruded on the periphery of the stainless steel pipe, damage to an optical fiber unit during stranding, shielding and armoring is effectively prevented, and effectiveness of the detection optical fiber 10 is guaranteed.
Referring to fig. 1, the metal shielding layer 5-3 further comprises a plurality of first shielding copper wires 5-3-1 and a plurality of second shielding copper wires 5-3-2; the first shielding copper wires 5-3-1 are arranged on two sides of each second detection optical fiber 10-2 in pairs to form optical fiber protection groups; the second shielding copper wires 5-3-2 are arranged between the adjacent optical fiber protection groups; the diameter d1 of the shielding copper wire 5-3-1 is larger than the diameter d2 of the second shielding copper wire 5-3-2, and the shielding effect is increased by arranging copper wires of two specifications of the first shielding copper wire 5-3-1 and the second shielding copper wire 5-3-2; the diameter d1 of the first shielding copper wire 5-3-1 is 0.5 to 0.8mm larger than the diameter of the corresponding second detection optical fiber 10-2, and the first shielding copper wire 5-3-1 protects the second detection lightThe fiber 10-2 is not damaged; the cross section of the metal shielding layer 5-3 of the cable is adjusted by adjusting the number and the diameter of the first shielding copper wire 5-3-1 and the second shielding copper wire 5-3-2, and the setting of the metal shielding layer 5-3 meets S = pi (d 1 ÷ 2) 2 *n1+π（d2÷2） 2 * n2, wherein S is the cross-sectional area of the metal shielding layer 5-3, n1 is the number of the first shielding copper wires 5-3-1, n2 is the number of the second shielding copper wires 5-3-2, and n1+ n2 is more than or equal to 12; the diameter d1 of the first shielding copper wire 5-3-1 is 2.0 to 2.5mm; the diameter d2 of the 5-3-2 wires of the second shielding copper wire is 0.8 to 2.0mm; the longitudinal section of a general shield is 16 to 50mm 2 The number of the first shielding copper wires and the number of the second shielding copper wires are controlled, so that the cross section area of the cable is effectively controlled, and the laying requirement and the power transmission capacity are met.
The metal wire armor layer 7 also comprises a plurality of armor metal wires, the armor metal wires are aluminum wires, and the wire diameter d3 is 2.0mm or 2.5mm; the number N of the armored metal wires is determined by the formula: n = int (pi x (D + D3) ÷ D3 x 1.08) -2, where D is the cable outer diameter before armoring; adjusting 1-2 metal wires according to the arrangement condition, and preferably arranging two third detection optical fibers 10-3 on the metal wire armor layer 7 for detecting external vibration and improving the efficiency of operation and maintenance; the diameter of the third detection optical fiber 10-3 is smaller than 0.5-1.0 mm of the metal wire.
The invention also provides a production process of the railway single-phase alternating current intelligent monitoring cable, which comprises the following steps:
step one, manufacturing a conductor 1: after drawing a copper wire, arranging the first detection optical fiber 10-1 in the middle, and twisting the copper wire on the outer side of the first detection optical fiber 10-1 according to a regular twisting mode to manufacture a conductor 1; in order to protect the first detection optical fiber 10-1, a polyolefin buffer layer is extruded outside the first detection optical fiber 10-1, and in order to prevent the first detection optical fiber 10-1 from being damaged, the diameter of a gap formed by an externally stranded conductor needs to be larger than the outer diameter of the first detection optical fiber 10-1; in order to improve the utilization efficiency of the wire drawing die, the conductor 1 is effectively used, and the sectional area of each layer needs to be designed according to the rule shown in table 1 when the molded line is designed.
TABLE 1
| Number of layers | Cross-sectional |
Cross-sectional area of 2/mm 2 | Cross-sectional area of 3/mm 2 |
| Center of a ship | Detection optical fiber | Detection optical fiber | Detection |
| 1 layer of | 25 | 35 | 50 |
| 2 layers of | 70 | 95 | 120 |
| 3 layers of | 150 | 185 | 240 |
| 4 layers of | 300 | 400 | |
| 5 layers of | 500 | 630 | |
| 6 layers of | 800 | ||
| 7 layers of | 1000 |
Step two, manufacturing an insulated wire core: arranging the conductor shielding layer 2, the insulating layer 3 and the insulating shielding layer 4 outside the conductor 1 in a three-layer co-extrusion manner to form an insulating wire core; the thickness of the conductor shielding layer 2 is controlled to be 0.8mm, the average thickness of the insulating layer 3 is not less than 11.0mm, and the thickness of the insulating shielding layer 4 is not less than 1.2mm.
Step three, extruding and wrapping the outer sheath 5: extruding an elastic semi-conducting layer 5-1 outside the insulated wire core, then arranging a metal shielding layer 5-3, and extruding a medium density polyethylene layer 5-2;
when the metal shielding layer 5-3 is arranged, a shielding machine is used for winding the second detection optical fiber 10-2, the first shielding copper wire 5-3-1 and the second shielding copper wire 5-3-2 which are subjected to rewinding treatment outside the elastic semi-conducting layer 5-1, the pitch ratio is controlled to be 10 to 16 times, a shielding winder 13 is arranged at a wire inlet during shielding, the second detection optical fiber can rotate according to the pitch requirement, the first shielding copper wire 5-3-1 and the second shielding copper wire 5-3-2 are ensured to be uniformly distributed, the first shielding copper wire 5-3-1 is arranged on two sides of the second detection optical fiber 10-2, the copper wires are properly pressed by a mold, the first shielding copper wire 5-3-1 and the second shielding copper wire 5-3-2 can be properly pressed into the elastic semi-conducting layer 5-1, the contact surface of the metal wire and the elastic semi-conducting layer 5-1 is improved, and the positions of the first shielding copper wire 5-3-1 and the second shielding copper wire 5-3-2 can be fixed without easy sliding.
The rewinding treatment mode is to rewind the second detection optical fiber 10-2 onto a nylon or plywood disc, the cylinder of the disc is not less than 300mm, the rewinding speed is not more than 5m/min, and detection damage is prevented.
Referring to fig. 2, the shielding machine is horizontally arranged and sequentially comprises a pay-off reel 11, a stranding cage 12 for transporting a first shielding copper wire 5-3-1, a second shielding copper wire 5-3-2 and a second detection optical fiber 10-2, a shielding winder 13 with the rotation direction consistent with that of the stranding cage 12, a shielding die 14, a wrapping machine 15, a tractor 16 for traction, a meter counter 17 and a take-up reel 18.
When the device is used, the pay-off reel 11 is used for paying off, the first shielding copper wire 5-3-1, the second shielding copper wire 5-3-2 and the second detection optical fiber 10-2 are placed in the stranding cage 12, the wire passing die used by the second detection optical fiber 10-2 is made of nylon materials, the distance between the stranding cage 12 and the shielding winder 13 is not less than 1.5m, in the whole winding process, the horizontal angle of the first shielding copper wire 5-3-1 and the horizontal angle of the second detection optical fiber 10-2 are 20 degrees, the winding speed is not more than 10m/min, and the second detection optical fiber 10-2 is prevented from being damaged.
Referring to FIG. 3, a shielding winder die 19 is arranged on a shielding winder 13 and comprises a shielding wire threading hole 19-1, a wire core threading hole 19-2 and a buckle 19-3, a first shielding copper wire 5-3-1, a shielding copper wire 5-3 and a second detection optical fiber 10-2 uniformly penetrate through the shielding wire threading hole 19-1, and the aperture is 2.5 to 3mm; the method is determined according to 5-3-1 of a selected first shielding copper wire, the first shielding copper wire is 0.5mm larger than the protective shielding copper wire, the aperture is uniformly distributed, the minimum distance between the edge of the aperture and a wire core wire through hole is 5-10mm, the wire core wire through hole 19-2 is 5-10mm larger than the outer diameter of the wire core, and the first shielding copper wire is clamped on a shielding winder 13 through a buckle 19-3.
The rotation direction and the speed of the shielding winder 13 are consistent with those of the twisting cage 12, and the shielding winder is tightly attached to the wire cores; then the steel wire passes through a shielding die 14 and enters a wrapping machine 15, a traction machine 16 provides traction power, a meter counter 17 measures the length, and the steel wire enters a take-up reel 18 to be tightened.
After the second detection optical fiber 10-2, the first shielding copper wire 5-3-1 and the shielding copper wire 5-3 are arranged, a layer of non-woven fabric belt is wrapped on the outer layer to prevent relative movement and ensure uniform shielding distribution.
When the medium-density polyethylene layer 5-2 is extruded, an extrusion die is adopted, the medium-density polyethylene layer 5-2 is extruded outside, the thickness of the medium-density polyethylene layer is 0.5-1mm larger than the diameter of the first shielding copper wire 5-1, 2 layers of low-smoke halogen-free flame retardant tapes 7 are wrapped, the thickness of the low-smoke halogen-free flame retardant tapes is 0.2mm, and the covering rate is 15-20%; by adopting an extrusion die, the gap between the elastic semi-conducting layer 5-1 and the metal shielding layer 5-3 is ensured to be filled with materials, and the second detection optical fiber 10-2, the first shielding copper wire 5-3-1 and the second shielding copper wire 5-3-2 are further protected.
Step four, preparing a low-smoke halogen-free flame-retardant wrapping tape 6, a metal wire armor layer 7, a flame-retardant glass fiber tape 8 and a sheath 9 outside the inner sheath 5 in sequence to prepare a cable; when the metal wire armor layer 7 is prepared, the number of the armor metal wires is calculated according to a formula, then the armor metal wires and a third detection optical fiber 10-3 are arranged outside the low-smoke halogen-free flame-retardant tape 7 in a row, 2 layers of flame-retardant glass fiber tapes 8 are wrapped, the thickness is 0.2mm, and the covering rate is 15-20%.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The utility model provides a railway is with single phase alternating current intelligent monitoring cable which characterized in that: the cable comprises a conductor (1), a conductor shielding layer (2), an insulating layer (3), an insulating shielding layer (4), an inner sheath (5), a low-smoke halogen-free flame-retardant wrapping tape (6), a metal wire armor layer (7), a flame-retardant glass fiber tape (8) and a sheath (9) which are arranged from inside to outside in sequence; the inner sheath (5) is of a double-layer structure and comprises an elastic semi-conducting layer (5-1) and a medium-density polyethylene layer (5-2) which are sequentially arranged outside the insulating shielding layer (4), and a metal shielding layer (5-3) embedded between the semi-conducting layer (5-1) and the medium-density polyethylene layer (5-2); the detection optical fiber (10) comprises a first detection optical fiber (10-1) arranged in the center of the conductor (1), at least one pair of second detection optical fibers (10-2) symmetrically arranged on the metal shielding layer (5-3) by taking the conductor (1) as the center, and at least one pair of third detection optical fibers (10-3) symmetrically arranged on the metal wire armor layer (7) by taking the conductor (1) as the center; the detection optical fiber comprises an optical fiber, a protective sleeve outside the optical fiber and a polyolefin buffer layer.
2. The single-phase alternating current intelligent monitoring cable for the railway according to claim 1, characterized in that: the conductor (1) is a non-compacted structure.
3. The single-phase alternating current intelligent monitoring cable for the railway according to claim 1, characterized in that: the metal shielding layer (5-3) comprises a plurality of first shielding copper wires (5-3-1) and a plurality of second shielding copper wires (5-3-2); the first shielding copper wires (5-3-1) are arranged on two sides of each second detection optical fiber (10-2) in pairs to form optical fiber protection groups; the second shielding copper wires (5-3-2) are arranged between the adjacent optical fiber protection groups; the first shielding copper wire (5-3-1) and the second shielding copper wire (5-3-2) are different in wire diameter.
4. The single-phase alternating current intelligent monitoring cable for the railway according to claim 3, wherein: the diameter d1 of the first shielding copper wire (5-3-1) is larger than the diameter of the second detection optical fiber (10-2); the diameter d1 of the first shielding copper wire (5-3-1) is larger than the diameter d2 of the second shielding copper wire (5-3-2).
5. The single-phase alternating current intelligent monitoring cable for the railway according to claim 3, wherein: the metal shielding layer (5-3) is arranged to meet the condition that S = pi (d 1/2) 2 x n1+ pi (d 2/2) 2 x n2, wherein S is the cross section area of the metal shielding layer (5-3), d1 is the wire diameter of the first shielding copper wires (5-3-1), n1 is the number of the first shielding copper wires (5-3-1), d2 is the wire diameter of the second shielding copper wires (5-3-2), n2 is the number of the second shielding copper wires (5-3-2), and n1+ n is larger than or equal to 12.
6. The single-phase alternating current intelligent monitoring cable for the railway according to claim 1, characterized in that: the metal wire armor layer (7) comprises a plurality of armored metal wires, the outer diameter d3 of each armored metal wire is larger than the diameter of the third detection optical fiber (10-3), and the number N of the armored metal wires is determined by a formula: n = int (pi x (D + D3) ÷ (D3 x 1.08)) -2, where D is the cable outer diameter before armouring.
7. A process for manufacturing a single-phase ac intelligent monitoring cable for railway according to claim 1, comprising the steps of:
step one, manufacturing a conductor (1): after a copper wire is drawn, arranging a first detection optical fiber (10-1) in the middle, and twisting the copper wire on the outer side of the first detection optical fiber (10-1) according to a normal twisting mode to manufacture a conductor (1);
step two, manufacturing an insulated wire core: arranging a conductor shielding layer (2), an insulating layer (3) and an insulating shielding layer (4) outside a conductor (1) in a three-layer co-extrusion manner to form an insulating wire core;
step three, extruding and wrapping the inner sheath (5): extruding an elastic semi-conducting layer (5-1) outside the insulated wire core, then arranging a metal shielding layer (5-3), and then extruding a medium density polyethylene layer (5-2);
and step four, preparing a low-smoke halogen-free flame-retardant wrapping tape (6), a metal wire armor layer (7), a flame-retardant glass fiber tape (8) and a sheath (9) outside the inner sheath (5) in sequence to prepare the cable.
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| CN202010258475.6A CN111430064B (en) | 2020-04-03 | 2020-04-03 | Single-phase alternating current intelligent monitoring cable for railway and production process thereof |
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| CN201336167Y (en) * | 2009-01-16 | 2009-10-28 | 上海波汇通信科技有限公司 | Novel high voltage power cable and equipment for manufacturing same |
| US10001613B2 (en) * | 2014-07-22 | 2018-06-19 | Schlumberger Technology Corporation | Methods and cables for use in fracturing zones in a well |
| CN206282646U (en) * | 2016-10-13 | 2017-06-27 | 福建南平太阳电缆股份有限公司 | A kind of crosslinked polyetylene insulated photoelectric compound cables of 110kV |
| CN109872846A (en) * | 2019-03-06 | 2019-06-11 | 中国铁路设计集团有限公司 | A kind of railway single-phase intelligent cable |
| CN110010292A (en) * | 2019-05-13 | 2019-07-12 | 远东电缆有限公司 | Rail traffic intelligent monitoring looped network cable |
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