CN113963866A - Intelligent power cable and cable manufacturing method - Google Patents
Intelligent power cable and cable manufacturing method Download PDFInfo
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- CN113963866A CN113963866A CN202111389348.0A CN202111389348A CN113963866A CN 113963866 A CN113963866 A CN 113963866A CN 202111389348 A CN202111389348 A CN 202111389348A CN 113963866 A CN113963866 A CN 113963866A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- 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
- H01B13/34—Apparatus or processes specially adapted for manufacturing conductors or cables for marking conductors or cables
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- 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
- H01B13/0006—Apparatus or processes specially adapted for manufacturing conductors or cables for reducing the size of conductors or cables
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- 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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- 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
- H01B13/245—Sheathing; Armouring; Screening; Applying other protective layers by extrusion of metal layers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- 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
- H01B13/34—Apparatus or processes specially adapted for manufacturing conductors or cables for marking conductors or cables
- H01B13/345—Apparatus or processes specially adapted for manufacturing conductors or cables for marking conductors or cables by spraying, ejecting or dispensing marking fluid
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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
- H01B7/0009—Details relating to the conductive cores
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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
- H01B7/17—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
- H01B7/36—Insulated conductors or cables characterised by their form with distinguishing or length marks
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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
- H01B7/36—Insulated conductors or cables characterised by their form with distinguishing or length marks
- H01B7/365—Insulated conductors or cables characterised by their form with distinguishing or length marks being indicia imposed on the insulation or conductor
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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 belongs to the technical field of power cables, and discloses an intelligent power cable and a cable manufacturing method. The dual-frequency RFID tag can detect the operation information of the cable in real time and meet the monitoring and early warning requirements.
Description
Technical Field
The invention relates to the technical field of power cables, in particular to an intelligent power cable and a cable manufacturing method.
Background
Urban construction develops rapidly, and road transformation, pipeline pass through, municipal administration, subway, natural gas pipeline etc. urban construction lead to cable run to shift transformation many times, make original underground cable passageway relative position change more, cause some cable run path passageway unclear. In addition, along with power line's transformation, the overhead line falls to the ground engineering more and more, and power cable supplies are short of demand, and more high tension cable is put into operation, and the cable is put in the cable channel and is received cable space's limitation, leads to increasing with the parallel cable of path, and cable run discernment is difficult, and fortune dimension personnel are difficult for distinguishing cable information, makes the circuit investigation work degree of difficulty increase. When a certain cable in the same channel breaks down, although a fault point can be found, the cable identification can be seen only at the entrance of the transformer substation, and the fault cable information cannot be confirmed quickly, so that the rush-repair time is greatly influenced, the cable fault treatment efficiency is low, and the social negative influence is brought.
In the work of fault first-aid repair and cable inspection, how to quickly identify the power cable in the cable channel, how to perfect the cable information, how to improve the working efficiency, the reliability of the operation data of the power cable and the like are important subjects of the operation and maintenance of the current power cable. At present, the field electronic management of power cables and the informatization technology of power cables need to be further improved.
The current solutions are: and in a construction site, the RFID label is adopted to manually assign codes outside the cable. Secondary code sending binding is involved, and a large amount of manpower and material resources are consumed; in addition, continuous power grid engineering construction is carried out, incremental asset sources are connected into a network, and asset code assignment and label pasting work is difficult and serious. Meanwhile, the field coding of the stock equipment cannot provide effective support for the production monitoring, logistics distribution, storage management and other services.
Disclosure of Invention
One object of the present invention is: provided are an intelligent power cable and a cable manufacturing method, which can quickly confirm the operation information of the cable.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, an intelligent power cable is provided and comprises a cable core, a plurality of double-frequency RFID tags and a sheath structure, wherein the sheath structure comprises an outer sheath layer, the outer sheath layer wraps the periphery of the cable core, and the double-frequency RFID tags are arranged between the cable core and the outer sheath layer and along the axial interval of the cable.
As an optional technical solution, the dual-frequency RFID tag has a strip-shaped sheet structure.
As an optional technical solution, the distance between two adjacent dual-frequency RFID tags is 1 m.
As an optional technical solution, the cable core includes a filling material and a plurality of wire cores, the plurality of wire cores are twisted with each other, and the filling material is filled between the wire cores and the sheath structure.
As an optional technical solution, the number of the wire cores is three.
As an optional technical solution, the wire core includes a conductor and a conductor shielding layer, and the conductor shielding layer is sleeved on the periphery of the conductor.
As an optional technical solution, the conductor is a copper conductor, and the copper conductor is formed by stranding a plurality of bare copper monofilaments; or, the conductor is an aluminum conductor; the aluminum conductor is formed by stranding a plurality of bare aluminum monofilaments.
As an alternative solution, the diameter of each bare copper monofilament ranges from 2.21mm to 3.50mm, and the diameter of the copper conductor ranges from 6.0mm to 34.1 mm;
each bare aluminum monofilament has a diameter ranging from 2.16mm to 4.30mm, and the aluminum conductor has a diameter ranging from 6.0mm to 34.0 mm.
As an optional technical solution, when the conductor is the aluminum conductor, if the cross section of the aluminum conductor is 70mm2When the pitch diameter ratio of the cable core is 22-28, if the cross section of the aluminum conductor is more than 70mm2The pitch-diameter ratio of the cable core is 25 to 35;
when the conductor is the copper conductor, the pitch-diameter ratio of the cable core is 25 to 35.
As an optional technical solution, the wire core further includes an insulating layer and an insulating shielding layer, the insulating layer is sleeved on the periphery of the conductor shielding layer, and the insulating shielding layer is sleeved on the periphery of the insulating layer.
As an optional technical solution, the thickness of the conductor shielding layer is 0.8mm, and the thickness of the insulation shielding layer is 1.0 mm.
As an optional technical solution, the conductor shielding layer and the insulation shielding layer are both made of an environment-friendly peroxide cross-linked semi-conductive shielding material by extrusion.
As an optional technical scheme, the environment-friendly peroxide crosslinking type semi-conductive shielding material comprises a polyolefin base stock, conductive carbon black, an antioxidant and a copper inhibitor.
As an optional technical solution, the wire core further includes a metal shielding layer, and the metal shielding layer is sleeved on the periphery of the insulation shielding layer.
As an optional technical solution, the metal shielding layer is made of soft copper overlapping wrapping.
As an optional technical scheme, the thickness of the metal shielding layer is not less than 0.10 mm.
As an optional technical solution, the average overlapping rate of the metal shielding layer is not less than 15%, and the minimum overlapping area is not less than 5%.
As an optional technical scheme, the thickness of the insulating layer is 4.5 mm.
As an alternative solution, the insulating layer is made of an extruded cross-linked polyethylene material.
As an alternative solution, the cross-linked polyethylene material comprises polyethylene and peroxide.
As an optional technical scheme, the periphery of the cable core is further sleeved with a wrapping layer, and the wrapping layer is used for wrapping and limiting the cable core and the filling material.
As an optional technical scheme, the wrapping layer is formed by overlapping wrapping of non-hygroscopic strips.
As an optional technical solution, the thickness of the wrapping layer is 0.3 mm.
As an optional technical solution, the lapping rate of the lapping layer ranges from 15% to 25%.
As an optional technical scheme, the sheath structure still includes the inner sheath layer, the inner sheath layer is located around the periphery of covering, the outer sheath layer is located the periphery of inner sheath layer, the dual-frenquency RFID tag set up in the inner sheath layer with between the outer sheath layer.
As an optional technical solution, the nominal thickness of the inner sheath layer is 1.8mm to 3.5 mm.
As an optional technical scheme, the thinnest point of the inner sheath layer is not less than 85-0.1 mm of the nominal value.
As an optional technical scheme, the nominal thickness of the outer sheath layer is 1.8mm to 3.5 mm.
As an optional technical scheme, the thinnest point of the outer sheath layer is not less than 85-0.1 mm of the nominal value.
As an optional technical solution, the inner sheath layer is made of environment-friendly polyethylene and polyvinyl chloride or polyolefin.
As an optional technical solution, the outer sheath layer is made of environment-friendly polyethylene and polyvinyl chloride or polyolefin.
As an optional technical solution, the sheath structure further includes an armor layer, and the armor layer is sheathed between the outer wall of the inner sheath layer and the inner wall of the outer sheath layer.
In a second aspect, there is provided a cable manufacturing method for manufacturing the smart power cable as described above, the cable manufacturing method comprising the steps of:
manufacturing a wire core;
stranding the wire core and a filling material together to obtain a cable core;
an armor layer wraps the periphery of the cable core;
attaching a dual-frequency RFID tag to the surface of the armor layer;
and wrapping an outer sheath layer on the periphery of the armor layer attached with the double-frequency RFID label.
As an optional technical solution, the steps are: attaching a dual-frequency RFID tag to the surface of the armor layer specifically comprises the following steps:
sequentially mounting a plurality of double-frequency RFID labels on a belt, and rolling into a chain belt structure;
at least two rolls of the belt provided with the double-frequency RFID label are placed on the longitudinal support;
the coiled belt provided with the double-frequency RFID label is discharged from the longitudinal support in a chain belt mode;
and binding and fixing the starting end of the belt provided with the dual-frequency RFID label with the armor layer.
The invention has the beneficial effects that:
the invention provides an intelligent power cable and a cable manufacturing method.
Drawings
The invention is explained in further detail below with reference to the figures and examples;
fig. 1 is a schematic cross-sectional view of a cable according to an embodiment.
In fig. 1:
1. a conductor; 2. a conductor shield layer; 3. an insulating layer; 4. an insulating shield layer; 5. a metal shielding layer; 6. a filler material; 7. wrapping a covering; 8. an inner jacket layer; 9. an armor layer; 10. a dual-frequency RFID tag; 11. an outer jacket layer.
Detailed Description
In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all 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.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description herein, it is to be understood that the terms "upper," "lower," "left," "right," and the like are based on the orientation or positional relationship shown in the drawings for convenience in description and simplicity of operation, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the present invention. Furthermore, the terms "first" and "second" are used merely for descriptive purposes and are not intended to have any special meaning.
In the description herein, references to the description of "an embodiment," "an example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
As shown in fig. 1, in a first aspect, the embodiment provides an intelligent power cable, which includes a cable core, a plurality of dual-frequency RFID tags 10 and a sheath structure, where the sheath structure includes an outer sheath layer 11, the outer sheath layer 11 is sleeved on the periphery of the cable core, the plurality of dual-frequency RFID tags 10 are all disposed between the cable core and the outer sheath layer 11, and the plurality of dual-frequency RFID tags 10 are axially spaced along the cable.
The intelligent power cable of the embodiment is widely applied to medium and high voltage power transmission systems of 10KV and above.
The double-frequency RFID tag 10 is an intelligent chip of radio frequency identification technology with a temperature measurement function, shares a central logic control circuit and an information storage unit, has an erasable function, supports high-frequency band work within the range of 1.30MHZ to 14.5MHZ and ultrahigh-frequency band work within the range of 860MHZ to 960MHZ, combines the double-frequency RFID tag 10 with a cable for application, solves the problem of manual code assigning construction on the spot of a client, and realizes automatic code assigning management of the cable. Under the premise of not changing the structure and the performance of the cable, the technical grade deep fusion of the dual-frequency RFID tag 10 and the cable is realized, the problem of object-code separation in the cable logistics, inventory, construction and operation and maintenance processes is solved, and the service life of the cable electronic tag is practically promoted to be available. The reading of the electronic tag information of the cable can be completed only by the non-contact type scanning of the cable outer package on site, various information such as cable manufacturers, models, lengths, equipment orders, flow sequence numbers and the like is obtained, the requirements of identification codes such as production and manufacturing units, material management units, site operation and maintenance personnel and the like are met, and the service pain points such as stealing goods, false report amount, allowance checking and the like in the cable material management are solved. In order to reduce the pressure of a plurality of operation terminals used by a front-line worker, the NFC mobile phone which is generalized at present is combined, the investment of additional professional mobile operation terminals is reduced, the cable equipment is managed finely, and the working efficiency of links such as circulation, construction, operation and maintenance is improved.
The dual-frequency RFID tag 10 is compounded with the outer sheath layer 11 of the power cable, so that the dual-frequency RFID tag 10 is effectively protected, the metal resistance is obviously enhanced, the contactless read distance can be stabilized at about 100cm, and the longest length can reach 120 cm. The dual-frequency RFID tag 10 has high temperature resistance and stress resistance, can bear the extrusion molding high temperature of 160 ℃ and can not be damaged by stretching and extruding.
In practical application, most of medium-high voltage power transmission systems transmit power across regions, the length of a cable is long, the application radius distance of a single dual-frequency RFID tag 10 is limited, and the dual-frequency RFID tags 10 are arranged at intervals along the axial direction of the cable, so that the running information of the cable can be effectively transmitted back to a database.
Optionally, the dual-frequency RFID tag 10 is manufactured by a manufacturing process technology combining dense copper etching and silver paste printing.
Alternatively, the dual frequency RFID tag 10 is a strip-shaped sheet structure. The dual-frequency RFID tag 10 uses a metal-resistant flexible high-temperature-resistant substrate as a transfer carrier.
In this example, mm is millimeters, cm is centimeters, m is meters, km is kilometers, Ω is ohms, bar is bars, kv is kilovolts.
Alternatively, the distance between two adjacent dual-frequency RFID tags 10 is 1 m.
Optionally, the cable core includes a filling material 6 and a plurality of cable cores, the plurality of cable cores are twisted with each other, and the filling material 6 is filled between the cable cores and the sheath structure. Specifically, the sinle silk sets up to three, and three sinle silk and 6 transposition of filling material guarantee that the appearance is round and tidy.
Optionally, the sinle silk includes conductor 1 and conductor shielding layer 2, and conductor shielding layer 2 cover is located the periphery of conductor 1.
The weighing cross section of the conductor 1 was 297mm2The outer diameter of the conductor 1 is 20.7 +/-0.2 mm, and the direct current resistance of the conductor 1 is less than 0.0601 omega/km under the condition of 20 ℃.
Optionally, the conductor 1 is a copper conductor, and the copper conductor is formed by stranding a plurality of bare copper monofilaments; or, the conductor 1 is an aluminum conductor; the aluminum conductor is formed by stranding a plurality of bare aluminum monofilaments.
Optionally, the diameter of each bare copper monofilament ranges from 2.21mm to 3.50mm, and the diameter of the copper conductor ranges from 6.0mm to 34.1 mm; each bare aluminum monofilament has a diameter in the range of 2.16mm to 4.30mm and the aluminum conductor has a diameter in the range of 6.0mm to 34.0 mm.
When the conductor 1 is an aluminum conductor, the cross section of the aluminum conductor is 70mm2And when the pitch diameter ratio is less than or equal to 22 and 28, the cross section of the aluminum conductor is more than 70mm2The pitch-diameter ratio of the cable core is 25 to 35;
when the conductor 1 is a copper conductor, the pitch ratio of the cable core is 25 to 35.
Optionally, the sinle silk still includes insulating layer 3 and insulating shielding layer 4, and the periphery of conductor shielding layer 2 is located to the insulating layer 3 cover, and the periphery of insulating layer 3 is located to insulating shielding layer 4 cover.
Optionally, the thickness of the conductor shielding layer 2 is 0.8mm, and the thickness of the insulation shielding layer 4 is 1.0 mm.
Optionally, the conductor shielding layer 2 and the insulation shielding layer 4 are both made of an environment-friendly peroxide cross-linked semi-conductive shielding material by extrusion.
Optionally, the environment-friendly peroxide cross-linked semiconductive shielding material comprises a polyolefin base material, conductive carbon black, an antioxidant and a copper inhibitor.
Optionally, the wire core further includes a metal shielding layer 5, and the metal shielding layer 5 is sleeved on the periphery of the insulation shielding layer 4.
Optionally, the metal shielding layer 5 is made of soft copper overlapping wrapping.
Optionally, the thickness of the metal shielding layer 5 is not less than 0.10 mm.
Optionally, the average overlapping rate of the metal shielding layer 5 is not less than 15%, and the minimum overlapping area is not less than 5%.
Optionally, the thickness of the insulating layer 3 is 4.5 mm.
Optionally, the insulating layer 3 is made of an extruded cross-linked polyethylene material.
Optionally, the crosslinked polyethylene material comprises polyethylene and a peroxide.
Optionally, the periphery of the cable core is further sleeved with a wrapping layer 7, and the wrapping layer 7 is used for wrapping and limiting the cable core and the filling material 6.
Optionally, the wrapping 7 is made of a non-hygroscopic tape lapped. The non-hygroscopic strip comprises a low-smoke halogen-free flame-retardant belt, wherein the low-smoke halogen-free flame-retardant belt adopts glass fiber as a base material, the base material is soaked in flame-retardant glue without halogen elements, and then the flame-retardant glue is cured and formed, so that the low-smoke halogen-free flame-retardant belt has high flame-retardant performance, and the oxygen index is more than 70%. In case of fire, the cable is burnt with less smoke and no halogen gas is released.
Optionally, the wrapping layer 7 has a thickness of 0.3 mm.
Optionally, the lapping rate of the lapping layer 7 ranges from 15% to 25%.
Optionally, the outer diameter of the wrapped layer 7 after wrapping is 96.0 +/-2 mm.
Optionally, the sheath structure still includes inner sheath layer 8, and the periphery around covering 7 is located to inner sheath layer 8 cover, and inner sheath layer 8's periphery is located to outer sheath layer 11 cover, and dual-frenquency RFID label 10 sets up between inner sheath layer 8 and outer sheath layer 11.
Optionally, the inner jacket layer 8 has a nominal thickness of 1.8mm to 3.5 mm.
Optionally, the thinnest point of the inner sheath layer 8 is not less than 85% -0.1mm of the nominal value.
Optionally, the nominal thickness of the outer jacket layer 11 is 1.8mm to 3.5 mm.
Optionally, the thinnest point of the outer sheath layer 11 is not less than 85% -0.1mm of the nominal value.
Optionally, the inner sheath layer 8 is made of environmentally friendly polyethylene and polyvinyl chloride or polyolefin. The polyethylene sheathing material can be prepared from environment-friendly polyethylene and polyvinyl chloride or polyolefin, the resistivity of the polyethylene sheathing material is not less than 1.0 multiplied by 1014 omega cm, and the dielectric strength is not less than 26 KV/mm.
The inner sheath layer 8 is made of an extruding machine with an extrusion opening diameter of 200mm, the temperatures of 1-9 temperature zones of the extruding machine are 148 ℃, 175 ℃, 178 ℃, 177 ℃, 176 ℃, 175 ℃, 176 ℃, 181 ℃ and 180 ℃, the temperatures of four temperature zones of the handpiece are 179 ℃, 178 ℃ and 179 ℃, the screw rotating speed of the extruding machine is 10 revolutions per minute, and the extruding current is 450 amperes.
Optionally, the outer diameter of the inner sheath layer 8 after wrapping is 101.0 +/-2 mm,
optionally, the outer sheath layer 11 is made of environment-friendly polyethylene and polyvinyl chloride or polyolefin, and the cable can prevent flame from spreading in case of fire. The outer diameter of the outer sheath layer 11 after extrusion is 115.0 +/-2 mm.
The outer sheath layer 11 is made by adopting an extruding machine with an extrusion opening diameter of 200mm, the temperatures of 1-9 temperature zones of the extruding machine are respectively 148 ℃, 175 ℃, 178 ℃, 177 ℃, 176 ℃, 175 ℃, 176 ℃, 181 ℃ and 180 ℃, the temperatures of four temperature zones of the handpiece are respectively 179 ℃, 178 ℃ and 179 ℃, the screw rotating speed of the extruding machine is 13.0 r/min, and the extruding current is 495A.
Optionally, the sheath structure further includes an armor layer 9, and the armor layer 9 is sleeved between the outer wall of the inner sheath layer 8 and the inner wall of the outer sheath layer 11.
Optionally, the armor layer 9 is formed by gap lapping of metal strips; alternatively, the armor layer 9 is made of several metal wires wrapped.
Optionally, the thickness of the metal strip ranges from 0.4mm to 0.9mm, the gap ratio of the metal strip ranges from 40% to 45%, and the sum of the gaps between the plurality of metal wires does not exceed the diameter of one metal wire. The metal belt effectively ensures the lateral pressure resistance protection capability of the cable, and the metal wire effectively ensures the longitudinal tensile resistance performance of the cable.
Optionally, the metal belt is a double-layer galvanized steel belt, the outer diameter of the double-layer galvanized steel belt after wrapping is 105.0 +/-2 mm,
in the manufacturing process of the metal strip, the lower pressure of a tractor is controlled to ensure that the cables in the production process are at the same horizontal height, the upper pressure of the tractor is 0.30 to 0.50 MPa, the tension pressure is 1.0 to 1.2 MPa, the take-up tension is 2500 to 4000N, and the tensile strength of the double-layer galvanized steel strip is not less than 295N/mm2The elongation is not less than 20 percent, and the mass of the double-layer galvanized steel strip is not less than 40g/m2。
In a second aspect, the present embodiment further provides a cable manufacturing method, where the cable manufacturing method is used to manufacture the composite RFID temperature measurement intelligent power cable, and the cable manufacturing method includes the following steps:
s100, manufacturing a wire core;
s200, twisting the wire core and the filling material 6 together to obtain a cable core;
s300, wrapping an armor layer 9 on the periphery of the cable core;
s400, attaching the double-frequency RFID tag 10 to the surface of the armor layer 9;
s500, wrapping an outer sheath layer 11 on the periphery of the armor layer 9 attached with the double-frequency RFID label 10.
Optionally, step S400 specifically includes:
s401, sequentially mounting a plurality of double-frequency RFID tags 10 on a belt and rolling the double-frequency RFID tags into a chain belt structure;
s402, at least two rolls of tapes provided with the double-frequency RFID tags 10 are placed on the longitudinal support;
s403, discharging the coiled belt provided with the double-frequency RFID tag 10 from the longitudinal support in a chain belt mode;
s404, binding and fixing the starting end of the belt provided with the dual-frequency RFID label 10 with the armor layer 9.
Optionally, a belt storage and release device is arranged on the longitudinal support for continuous belt replacement.
Optionally, step S500 specifically includes:
s501, the belt provided with the double-frequency RFID label 10 and the cable core wrapped with the armor layer 9 pass through an extruding machine for extruding and wrapping the outer sheath layer 11.
The method further comprises the following steps before the step S501: the tape with the dual frequency RFID tag 10 mounted thereon is at the same level as the armour layer 9.
Melting the environment-friendly polyethylene and the polyvinyl chloride or the polyolefin for manufacturing the outer sheath layer 11 in an extruding machine, and extruding the environment-friendly polyethylene and the polyvinyl chloride or the polyolefin on the outer wall of the cable manufactured in the step SS404 through a head of the extruding machine.
After step S501, step S502 is further included: the outer jacket layer 11 is cooled and molded.
After step S502, step S503 is further included: the identification is sprayed on the installation position of the dual-frequency RFID tag 10.
Optionally, step S503 specifically includes:
s5031, reading the RFID label information and identifying the position of the dual-frequency RFID label 10 through an RFID label reader-writer, and spraying the identification in a linkage manner through ink-jet printing equipment.
After obtaining the RFID tag information, the method further includes step S5032: and transmitting the RFID label information and the cable production information data to a database.
Optionally, step S100 specifically includes:
s101, drawing a copper rod with the diameter of 8mm into a copper monofilament with the diameter of 3.33 mm;
and S102, stranding the copper monofilaments layer by adopting a stranding machine.
Optionally, the tolerance requirement of the copper monofilament is 3.33 +/-0.01 mm, the elongation of the copper monofilament is greater than or equal to 37%, and the resistivity of the copper monofilament does not exceed 0.017241 omega mm2/m。
Optionally, step S102 specifically includes:
and S1021, sequentially twisting three layers of copper monofilaments by taking 1 copper monofilament as an axis and arranging 6, 12 and 18 copper monofilaments on each layer from inside to outside.
Optionally, the ratio of the twist pitch diameter of the copper monofilament at the outermost layer is less than or equal to 12.
Optionally, the wire core includes four layers of copper monofilaments, the number of the copper monofilaments in the first layer is 1, the number of the copper monofilaments in the second layer is 6, the number of the copper monofilaments in the third layer is 12, and the number of the copper monofilaments in the fourth layer is 18;
optionally, the stranding directions of the copper monofilaments on the second layer and the copper monofilaments on the fourth layer are both the left direction, and the stranding direction of the copper monofilaments on the third layer is the right direction; or the stranding directions of the copper monofilaments on the second layer and the copper monofilaments on the fourth layer are both right directions, and the stranding direction of the copper monofilaments on the third layer is left direction.
After step S102, step S103 is further included: the conductor shielding layer 2, the insulating layer 3 and the insulating shielding layer 4 are extruded by adopting a production mode of three-layer co-extrusion, dry-process crosslinking and continuous vulcanization to prepare an insulating wire core, so that the insulating purification degree of the cable and the quality of an extruded product are ensured.
Optionally, the insulated wire core is processed and produced by a vertical cross-linking production line, the average speed of the vertical cross-linking production line is 5.38 +/-0.3 meters per minute, and the vertical cross-linking production line can realize a production mode of three-layer co-extrusion, dry cross-linking and continuous vulcanization.
The insulating shielding layer 4 is extruded by an extruder with an extrusion opening diameter of 80mm, four layers of machine head filter screens are adopted, and each layer is 20 meshes, 120 meshes, 80 meshes and 20 meshes; the temperatures of the temperature zones 1 to 8 of the extruder are respectively 80 ℃, 100 ℃, 110 ℃, 112 ℃, 115 ℃, 116 ℃ and 118 ℃, the screw rotation speed of the extruder is 9.6 revolutions per minute, and the extrusion pressure is 345 bar.
Optionally, the insulating layer 3 is extruded by an extruder with an extrusion opening diameter of 80mm, and the filter screen of the machine head is four layers, wherein each layer is 20 meshes, 120 meshes, 80 meshes and 20 meshes; the temperatures of the temperature zones 1 to 8 of the extruder are respectively 80 ℃, 100 ℃, 110 ℃, 112 ℃, 115 ℃, 116 ℃ and 118 ℃, the screw rotation speed of the extruder is 6.0 revolutions per minute, and the extrusion pressure is 216 bar.
Optionally, the conductor shielding layer 2 is extruded by an extruder with an extrusion opening diameter of 80mm, the filter screen of the machine head is four layers, and each layer is 20 meshes, 120 meshes, 80 meshes and 20 meshes; the temperatures of 1-8 temperature zones of the extruder are respectively 80 ℃, 100 ℃, 110 ℃, 112 ℃, 115 ℃, 116 ℃ and 118 ℃, the screw rotation speed of the extruder is 8.1 revolutions per minute, and the extrusion pressure is 420 bar.
The dimensions of the insulating and shielding layer 4, the insulating layer 3 and the conductor and shielding layer 2 are respectively as follows: diameter 21.3mm, diameter 22.9mm and diameter 45.0mm,
optionally, the prepared insulated wire core is placed into a baking room at 70 +/-2 ℃ to be baked for 120 hours, and the baking starting time is counted when the surface temperature of the insulated wire core reaches 68 ℃.
Optionally, after step S103, step S104 is further included: and the copper strips are overlapped and wrapped on the periphery of the insulating wire core.
The thickness of the copper strip is 0.10mm, the width is 40mm, the lapping overlapping rate of the copper strip is 15-17%, and the outer diameter of the copper strip after lapping is 44.0 +/-0.1 mm.
In the manufacturing process of the insulated wire core, the lower pressure of a tractor is controlled to ensure that the cable in the production process is at the same horizontal height, the upper pressure of the tractor is 0.10 to 0.15 MPa, the tension pressure is 0.35 to 0.45 MPa, the take-up tension is 1500 to 3000N, the resistivity of the copper strip is not more than 0.017241 omega mm2/m。
Optionally, the cabling direction of the wire core and the filling material 6 is set to be right.
Optionally, the cabling mode of the wire core and the filling material 6 adopts back-twist cabling.
Optionally, the wire core and the filler material 6 have a cabling pitch to diameter ratio in the range of 25 to 35.
Optionally, the filler material 6 is a non-hygroscopic polypropylene reticulated tear fiber. The filling material 6 is aged for 240 hours under the temperature regulation of 100 +/-2 ℃ without embrittlement phenomenon. The filling material 6 wraps the periphery of the wire core, is tight and has no gap, and ensures that the finished cable section is not pulverized after an additional aging test.
Optionally, the roundness of the cable core after the filling material 6 is twisted with the cable core reaches more than 95%.
Optionally, after step S200, step S201 is further included: the periphery of the cable core is wrapped with a wrapping layer 7, and the periphery of the wrapping layer 7 is wrapped with an inner sheath layer 8.
The conductor shielding layer 2 and the insulation shielding layer 4 of the embodiment both adopt the environment-friendly peroxide crosslinking type semi-conductive shielding material, so that the important electrical performance index of the cable body is well ensured, namely, no detectable discharge exceeding the sensitivity (6pC) of the declared test is generated by the tested cable under the partial discharge (1.73Uo) voltage.
Tests show that the crosslinked polyethylene material has the temperature of 200 +/-3 ℃, the load time of 15 minutes and the mechanical stress of 20N/cm2The maximum elongation of the crosslinked polyethylene material under load in the elongation test of (1) is not more than 130%. Insulation tg δ test (sample is heated to a temperature where conductor 1 exceeds conductor 1 maximum temperature during normal operation of the cable)5 ℃ to 10 ℃) is not more than 5 times 10 minus 4.
The conductor 1 of the embodiment adopts a multi-layer compact structure, and the outer diameter of the conductor 1 is reduced on the premise of ensuring that the cross section is large enough; the wall thickness of the insulating layer 3 is uniform, and the eccentricity is not more than 5%; the metal shielding layer 5 has excellent electrical performance and small partial discharge, and the electrical performance is guaranteed for a long time.
The basic reaction principle of the crosslinked polyethylene material during the operation of the cable is as follows: 1. the cross-linking agent is heated and decomposed to generate active free radicals; 2. the active free radical reacts with the polyethylene molecular chain to activate the polyethylene molecular chain; 3. the reactive polyethylene molecular chains react with each other to crosslink to form crosslinked polyethylene.
In addition, the foregoing is only the preferred embodiment of the present invention and the technical principles applied. 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 above embodiments, and may include other equivalent 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 (13)
1. The utility model provides an intelligent power cable, its characterized in that includes cable core, a plurality of dual-frenquency RFID label (10) and sheath structure, the sheath structure includes oversheath layer (11), oversheath layer (11) wrap up in the periphery of cable core, a plurality of dual-frenquency RFID label (10) all set up in the cable core with between oversheath layer (11), a plurality of dual-frenquency RFID label (10) are followed the axial interval arrangement of cable.
2. An intelligent power cable according to claim 1, wherein the cable core comprises a filler material (6) and a plurality of cores, the plurality of cores being twisted with each other, the filler material (6) being filled between the cores and the sheath structure.
3. The intelligent power cable according to claim 2, wherein the wire core comprises a conductor (1) and a conductor shielding layer (2), and the conductor shielding layer (2) is sleeved on the periphery of the conductor (1).
4. A smart power cable according to claim 3, characterized in that the conductor (1) is a copper conductor made of several bare copper monofilaments twisted; or, the conductor (1) is an aluminum conductor; the aluminum conductor is formed by stranding a plurality of bare aluminum monofilaments.
5. A smart power cable as recited in claim 4, wherein each of the bare copper monofilaments has a diameter in the range of 2.21mm to 3.50mm, and the copper conductor has a diameter in the range of 6.0mm to 34.1 mm;
each bare aluminum monofilament has a diameter ranging from 2.16mm to 4.30mm, and the aluminum conductor has a diameter ranging from 6.0mm to 34.0 mm.
6. A smart power cable according to claim 5, characterized in that when the conductor (1) is the aluminum conductor, if the cross section of the aluminum conductor is 70mm2When the pitch diameter ratio of the cable core is 22-28, if the cross section of the aluminum conductor is more than 70mm2The pitch-diameter ratio of the cable core is 25 to 35;
when the conductor (1) is the copper conductor, the pitch-diameter ratio of the cable core is 25-35.
7. The intelligent power cable according to claim 4, wherein the wire core further comprises an insulating layer (3) and an insulating shielding layer (4), the insulating layer (3) is sleeved on the periphery of the conductor shielding layer (2), and the insulating shielding layer (4) is sleeved on the periphery of the insulating layer (3).
8. The intelligent power cable according to claim 7, wherein the wire core further comprises a metal shielding layer (5), and the metal shielding layer (5) is sleeved on the periphery of the insulation shielding layer (4).
9. An intelligent power cable according to claim 2, wherein the cable core is further sleeved with a wrapping layer (7) at the periphery, and the wrapping layer (7) is used for wrapping and limiting the wire core and the filling material (6).
10. The smart power cable of claim 9, wherein the sheath structure further comprises an inner sheath layer (8), the inner sheath layer (8) is disposed on the outer periphery of the wrapping layer (7), the outer sheath layer (11) is disposed on the outer periphery of the inner sheath layer (8), and the dual-frequency RFID tag (10) is disposed between the inner sheath layer (8) and the outer sheath layer (11).
11. A smart power cable according to claim 10, wherein the sheath structure further comprises an armour layer (9), the armour layer (9) being sheathed between an outer wall of the inner sheath layer (8) and an inner wall of the outer sheath layer (11).
12. A cable manufacturing method for manufacturing the smart power cable according to any one of claims 1 to 11, the cable manufacturing method comprising the steps of:
manufacturing a wire core;
the wire core and the filling material (6) are jointly stranded to obtain a cable core;
an armor layer (9) is wrapped on the periphery of the cable core;
attaching a dual-frequency RFID tag (10) to the surface of the armor layer (9);
an outer sheath layer (11) is wrapped on the periphery of the armor layer (9) attached with the double-frequency RFID label (10).
13. The cable manufacturing method according to claim 12, characterized in that said steps of: attaching a dual-frequency RFID tag (10) to the surface of the armor layer (9), specifically:
sequentially mounting a plurality of double-frequency RFID labels (10) on a belt and rolling the double-frequency RFID labels into a chain belt structure;
at least two rolls of the belt provided with the double-frequency RFID label (10) are placed on a longitudinal support;
the coiled belt provided with the double-frequency RFID label (10) is discharged from the longitudinal support in a chain belt mode;
and binding and fixing the starting end of the belt provided with the dual-frequency RFID label (10) with the armor layer (9).
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| CN202011355535.2A CN112435811A (en) | 2020-11-27 | 2020-11-27 | Manufacturing method of intelligent power cable based on dual-frequency RFID technology and cable |
| CN2020113555352 | 2020-11-27 |
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| CN113963866A true CN113963866A (en) | 2022-01-21 |
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| CN202111389348.0A Pending CN113963866A (en) | 2020-11-27 | 2021-11-22 | Intelligent power cable and cable manufacturing method |
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