CN112435811A - Manufacturing method of intelligent power cable based on dual-frequency RFID technology and cable - Google Patents

Abstract

A production and manufacturing method of an intelligent power cable based on a dual-frequency RFID technology relates to a composite production and manufacturing method of a dual-frequency RFID electronic tag and a power cable and a design method of a comprehensive cable sheath structure. A double-frequency RFID electronic tag is arranged between the armor and the sheath, and the sheath is made of polyethylene, polyvinyl chloride or polyolefin materials to meet mechanical protection requirements and electrical safety performance. The invention has the advantages that the composite dual-frequency RFID technology intelligent power cable is provided, and the construction requirements of the ubiquitous power Internet of things of state grid power companies are met. The manufacturing method belongs to the technical field of electric wires and cables, and is mainly used for manufacturing medium and high voltage power cables of 10kV or more.

Description

Manufacturing method of intelligent power cable based on dual-frequency RFID technology and cable

Technical Field

The technical scheme particularly relates to a production and manufacturing method of an intelligent power cable based on a double-frequency RFID technology and the cable, belongs to the technical field of wires and cables, and is mainly used for production and manufacturing of medium and high voltage power cables of 10kV or above.

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

The difficulty of the technical scheme is mainly the design of the composite production of the dual-frequency RFID electronic tag and the power cable on the manufacturing method and the comprehensive sheath structure of the cable.

A manufacturing method of an intelligent power cable based on a dual-frequency RFID technology comprises the following steps:

1) manufacturing a wire core for later use;

2) taking the wire core prepared in the step 1), and stranding the wire core and the filler together to obtain a cable core;

3) the cable prepared in the step 2) is sequentially wrapped with an armor layer and an outer sheath layer, and the method is characterized in that

In the step 3), the armor layer is wrapped outside the cable core prepared in the step 2), and then a double-frequency RFID electronic tag and power cable outer sheath layer composite production process is adopted, wherein the steps comprise:

and 3.1) at least 2 rolls of RFID electronic tags are placed on the longitudinal support. A belt storage slow release device is designed on the longitudinal support; for continuous tape change;

3.2) the coiled RFID tags are discharged from the longitudinal support in a chain belt mode (single RFID tags are sequentially arranged on the belt to form a chain belt structure), the starting end of the tags is bound and fixed with the armor layer, so that the tags and the armor layer are at the same horizontal height, and the chain belt where the tags are located and a cable wrapping the armor layer penetrate through a sheath extrusion molding machine head for extruding the outer sheath layer and are continuously pulled;

3.3) melting the sheath material for manufacturing the outer sheath layer in an extruding machine, and extruding the sheath material by a machine head of the extruding machine outside the semi-finished product of the cable manufactured in the step 3.2) to obtain the cable with the RFID label;

3.4) after the cable prepared in the step 3.3) is cooled and formed through a water tank, spraying marks at the positions of the RFID labels of the cable, wherein the method comprises the steps of reading the information of the RFID labels and identifying the positions of the RFID labels through an RFID label reader-writer, and simultaneously spraying the marks through linkage of ink-jet printing equipment;

3.5) transmitting the RFID tag information and the cable production information data to the database via 3.4) the RFID tag information.

Specifically, the method comprises the following steps:

in the step 1):

1.1) preparing metal monofilaments:

drawing a copper rod with the diameter phi of 8mm into a copper single wire with the diameter phi of 3.33mm, wherein the tolerance requirement of the copper single wire is 3.33 +/-0.01 mm, the elongation of the copper single wire is more than or equal to 37 percent, and the resistivity of the copper single wire is not more than 0.017241 omega mm²/m；

Adopting a stranding machine to layer and strand the copper monofilaments: the copper monofilament arranges (from inlayer to skin, 1, 6, 12 and 18 monofilament in proper order) according to 1+6+12+18, divide into four layers and sticiss through the cubic, and every layer sticiss to distribute in proper order: 6 wire coils, 12 wire coils and 18 wire coils;

drawing each layer of compact by adopting a die with a corresponding size and angle, setting the monofilament direction from inside to outside according to S, Z, S, wherein the monofilament direction of the secondary outer layer is Z direction, and the monofilament direction of the outermost layer is S direction; the ratio of the twisted pitch of the single wires at the outermost layer is not more than 12 times;

the prepared conductor has the following requirements: the direct current resistance of the conductor at 20 ℃ is less than 0.0601 omega/km; the conductor has a weighed cross-sectional area of 297mm²(ii) a The outer diameter of the conductor is 20.7 +/-0.2 mm.

1.2) extruding and coating a conductor shielding layer, an insulating layer and an insulating shielding layer by adopting a production mode of three-layer co-extrusion, dry-process crosslinking and continuous vulcanization to obtain an insulating wire core; the insulated wire core is processed and produced by adopting a vertical VCV (vertical cross-linking) production line:

insulating shielding layer: the insulation shielding layer is prepared by extruding and wrapping an environment-friendly peroxide cross-linking type semi-conductive shielding material, and the nominal thickness of the insulation shielding layer is 2.5 mm;

the extrusion package adopts a phi 80 extruder, and the filter screen of the machine head adopts four layers which are respectively 20 meshes, 120 meshes, 80 meshes and 20 meshes; the temperature of the 1 st-8 th temperature zone of the extruder is respectively as follows: 80 ℃, 100 ℃, 110 ℃, 112 ℃, 115 ℃, 116 ℃ and 118 ℃, the screw rotating speed of the extruder is 9.6 revolutions per minute, and the extrusion pressure is 345 bar;

insulating layer: the insulating layer is made of an ultra-clean cross-linked polyethylene material by extrusion, and the nominal thickness of the insulating layer is 10.5 mm;

the extrusion package adopts a phi 200 extruder, the filter screen of the machine head adopts seven layers which are respectively 20 meshes, 80 meshes, 150 meshes, 300 meshes, 150 meshes, 80 meshes and 20 meshes, and the temperatures of 1 st to 8 th temperature zones of the extruder are respectively as follows: 116 ℃, 118 ℃ and 120 ℃, the screw speed of the extruder is 6.0 revolutions per minute, and the extrusion pressure is 216 bar;

conductor shielding layer: the insulation shielding layer is prepared by extruding and wrapping an environment-friendly peroxide cross-linking type semi-conductive shielding material, and the nominal thickness of the conductor shielding layer is 1.5 mm;

the extrusion package adopts a phi 80 extruder, and the filter screen of the machine head adopts four layers which are respectively 20 meshes, 120 meshes, 80 meshes and 20 meshes; the temperature of the 1 st-8 th temperature zone of the extruder is respectively as follows: 80 ℃, 100 ℃, 110 ℃, 112 ℃, 115 ℃, 116 ℃ and 118 ℃, the screw rotation speed of the extruder is 8.1 r/min, and the extrusion pressure is 420 bar;

the sizes of the three layers of the mold are respectively as follows: phi 21.3mm, phi 22.9mm and phi 45.0 mm;

the average speed of the production line is 5.38 +/-0.3 m/min;

1.3) placing the prepared insulated wire core into a drying room at 70 +/-2 ℃ for processing for 120h, and calculating the starting time from the surface temperature of the insulated wire core to 68 ℃;

1.4) wrapping a metal shielding layer, comprising the following steps:

adopting copper strips with the thickness of 0.10mm and the width of 40mm to be lapped and wrapped outside the insulated wire core in the step 1.3); the lapping rate of the lapping is 15% -17%; the outer diameter of the wrapped cable is 44.0 +/-0.1 mm;

in the manufacturing process, the lower pressure of a tractor is controlled to enable the cables in the production process to be at the same horizontal height, the upper pressure of the tractor is 0.10-0.15 MPa, the tensioning pressure is 0.35-0.45 MPa, and the take-up tension is 15% and is 1500-3000N; the copper strip conforms to the GB/T11091 specification, and the resistivity of the copper strip does not exceed 0.017241 omega mm²/m。

In the step 2), twisting the three wire cores prepared in the step 1) and the filling material;

the cabling direction is the right direction; the cabling mode is that untwisting cabling is adopted, the diameter ratio of cabling nodes ranges from 25 to 35, and the tension is not more than 20 kN;

the filling material is non-hygroscopic polypropylene reticular tear fiber, and the material is required to be aged at 100 +/-2 ℃ for 240 hours without embrittlement;

the roundness of the filled cable core reaches more than 95 percent.

Further:

in step 2), an additional step is included: attaching 1) wrapping a wrapping layer outside the cable core; attaching 2) wrapping an inner sheath layer outside the wrapping layer;

in the step 1), the wrapping layer material is a low-smoke halogen-free flame-retardant tape, the material is formed by taking a glass fiber tape as a base material, impregnating flame-retardant glue without any halogen, and curing, and the material has high flame-retardant performance, has an oxygen index of more than 70 percent, and is formed by adopting the specification of 0.2mm (thickness) multiplied by 60mm (width) and 5-8 mm of the width of a wrapping cover;

the outer diameter is 96.0 +/-2 mm after wrapping;

in the step 2), the inner sheath layer is prepared by extruding high-electric polyethylene sheath materials, and the nominal thickness of the inner sheath layer is 2.5mm and meets the requirement of GB/T12706 standard regulation; the outer diameter of the inner sheath layer pair is 101.0 +/-2 mm;

the high-electric polyethylene sheath material is a polyethylene sheath material with volume resistivity not less than 1.0 multiplied by 1014 omega cm and dielectric strength not less than 26 kV/mm;

the extrusion package adopts a phi 200 extruding machine, and the temperature of the 1 st to 9 th temperature areas of the extruding machine is respectively as follows: 148 deg.C, 175 deg.C, 178 deg.C, 177 deg.C, 176 deg.C, 175 deg.C, 176 deg.C, 181 deg.C and 180 deg.C; the temperatures of the four temperature zones of the handpiece are respectively as follows: 179 ℃, 178 ℃ and 179 ℃, the screw speed of the extruder being 10.0 revolutions per minute, the extrusion current being 450A.

Specifically, the method comprises the following steps:

in the step 3), the armor layer is wrapped by double-layer galvanized steel strip gaps, the thickness is 0.8mm, the width is 60mm, and the gap rate is 40-45%; the outer diameter of the steel belt is 105.0 +/-2 mm after being wrapped; in the manufacturing process, the lower pressure of a tractor is controlled to enable the cables in the production process to be at the same horizontal height, the upper pressure of the tractor is 0.30-0.50 MPa, the tensioning pressure is 1.0-1.2 MPa, and the take-up tension is 2500-4000N.

The galvanized steel strip conforms to the YB/T024 regulation and the tensile strength of the galvanized steel strip is not less than 295N/mm²The elongation is not less than 20 percent, and the weight of the zinc layer of the galvanized steel strip is not less than 40g/m²。

In the step 3), the outer sheath layer is prepared by extruding and wrapping high-electric polyethylene sheath materials; the nominal thickness of the outer sheath layer is 4.7mm, and the requirement of GB/T12706 standard regulation is met; the overall outer diameter of the prepared cable is 115.0 +/-2 mm;

the high-electric polyethylene sheath material is a sheath material with volume resistivity not less than 1.0 multiplied by 1014 omega cm and dielectric strength not less than 26 kV/mm;

the extrusion coating sheath material adopts a phi 200 plastic extruding machine, and the temperature of the 1 st to 9 th temperature areas of the plastic extruding machine is respectively as follows: 148 ℃, 175 ℃, 178 ℃, 177 ℃, 176 ℃, 175 ℃, 176 ℃, 181 ℃ and 180 ℃, wherein the four temperature zones of the handpiece have the following temperatures: 179 ℃, 178 ℃ and 179 ℃, screw speed of the extruder 13.0 revolutions per minute, extrusion current 495A.

The utility model provides an intelligence power cable based on dual-frenquency RFID technique, includes cable core and the sheath structure of parcel outside the cable core, its characterized in that: also includes a plurality of dual-frequency RFID tags;

the dual-frequency RFID tag is a strip-shaped sheet structure; the dual-frequency RFID tag supports two frequency bands of 860 MHz-960 MHz ultrahigh frequency UHF and 13.0 MHz-14.5 MHz high frequency HF;

the sheath structure comprises an armor layer and an outer sheath layer, and the armor layer is covered outside the cable core;

the dual-frequency RFID tag is arranged between the armor layer and the outer sheath layer; the double-frequency RFID tags are uniformly arranged at intervals along the axial direction of the cable;

the armor layer is formed by wrapping metal strips in a clearance mode; or the armor layer is formed by wrapping a plurality of metal wires;

the outer sheath layer is formed by extruding and wrapping environment-friendly polyethylene, polyvinyl chloride or polyolefin sheath materials.

The sheath structure further comprises a wrapping layer and an inner sheath layer; the cable core is externally provided with a wrapping layer, the wrapping layer is externally provided with an inner sheath layer, and the inner sheath layer is externally provided with an armor layer;

the nominal thickness of the inner sheath layer is 1.8 mm-3.5 mm, and the thickness of the thinnest point is not less than 85-0.1 mm of the nominal value; the inner sheath layer is formed by extruding and wrapping environment-friendly polyethylene, polyvinyl chloride or polyolefin materials;

the wrapping layer is formed by overlapping and wrapping a layer of non-hygroscopic strip material; the thickness of the wrapping layer is 0.3mm, and the covering rate range is 15-25%.

The cable core is formed by twisting a plurality of wire cores and filling materials;

the structure of the wire core is as follows: the conductor, the conductor shielding layer, the insulating shielding layer and the metal shielding layer are arranged from inside to outside in sequence;

the conductor is a copper conductor; the copper conductor is formed by twisting bare copper monofilaments, and the diameter range of the bare copper monofilaments is 2.21-3.50 mm; the diameter range of the conductor is 6.0 mm-34.1 mm;

alternatively, the conductor is an aluminum conductor; the aluminum conductor is formed by twisting bare aluminum monofilaments, and the diameter range of the bare aluminum monofilaments is 2.16-4.30 mm; the diameter range of the conductor is 6.0 mm-34.0 mm;

the conductor shielding layer and the insulation shielding layer are both made of environment-friendly peroxide cross-linked semi-conductive shielding materials; the thickness of the conductor shielding layer is 0.8 mm; the thickness of the insulating shielding layer is 1.0 mm;

the insulating layer is made of cross-linked polyethylene environment-friendly insulating material; the thickness of the insulating layer is 4.5 mm;

the metal shielding layer is formed by soft copper tapes which are lapped and lapped in an overlapping mode; the thickness of the soft copper strip is not less than 0.10mm, the average covering rate of the overlapped wrapping is not less than 15%, and the minimum covering rate is not less than 5%.

The cable core is formed by twisting three wire cores and filling materials, and the cabling pitch-diameter ratio range of the cable core is as follows:

the cross-sectional area is 70mm²And the following aluminum core cables, the cabling pitch-diameter ratio is 22-28; the cross-sectional area is more than 70mm²The cabling pitch-diameter ratio of the aluminum core cable is 25-35;

the cabling pitch-diameter ratio of the copper core cable is 25-35;

the armor layer is formed by wrapping gaps of metal strips in a wrapping mode, the thickness range of the metal strips is 0.4-0.9 mm, and the gap rate is 40% -45%;

or the armor layer is formed by wrapping a plurality of metal wires; the sum of the gaps between the metal steel wires does not exceed the diameter of one metal wire;

the nominal thickness of the outer sheath layer is 1.8 mm-3.5 mm, and the thickness of the thinnest point is not less than 85-0.1 mm of the nominal value;

the double-frequency RFID tags are uniformly distributed between the armor layer and the outer sheath layer at intervals of 1 meter.

Description of the technical principle:

the technical scheme selects the conductor shield and the insulation shield as environment-friendly peroxide crosslinking type semi-conductive shielding materials, and the main components of the materials are polyolefin base materials, conductive carbon black, antioxidants, copper inhibitors and the like. The insulation is an environment-friendly insulation material of crosslinked polyethylene of 35kV or below, which takes low-density polyethylene as a base material and peroxide as a crosslinking agent, and well ensures that the important electrical performance index of a cable body, namely, no detectable discharge exceeding the declared test sensitivity (6 pC) is generated by a tested cable under the partial discharge (1.73 Uo) voltage.

The GB/T12706-2008 standard specifies: at 1.73Uo, there should be no detectable discharge produced by the tested cable that exceeds the sensitivity of the claimed test (10 pC or better).

Cross-linked polyethylene insulation heat extension test: the air temperature is 200 plus or minus 3 ℃; the load time is 15 min; mechanical stress 20N/cm 2. The maximum elongation of the crosslinked polyethylene insulation under load is not more than 130% (better than the index requirement that the maximum elongation of the crosslinked polyethylene insulation under GB/T12706-2008 standard load is not more than 175%).

The insulation tg delta test (the temperature of the sample is heated to 5-10 ℃ when the temperature of the conductor exceeds the maximum temperature of the conductor when the cable normally runs) is not more than 5 x 10-4 (better than the GB/T12706-2008 standard which is not more than 10 x 10-4 index requirement).

In the cable production and manufacturing method, the large-section conductor adopts a multi-layer compact structure, so that the outer diameter of the conductor is reduced; the insulation thickness is uniform, and the eccentricity is not more than 5%; the metal shield has excellent electrical performance, small partial discharge and long-time reliable electrical guarantee, structurally selects a conductor shield and an insulation shield, selects the materials as an environment-friendly peroxide cross-linking type semi-conductive shield material, mainly comprises polyolefin base materials, conductive carbon black, an antioxidant, a copper resisting agent and the like, and insulates the environment-friendly cross-linked polyethylene insulation material of 35kV or below by using low-density polyethylene as the base material and peroxide as a cross-linking agent.

The conductor shield is an extruded cross-linked semi-conducting layer which is uniformly coated on the conductor, and has smooth surface, no obvious twisted wire wale, and no sharp corner, particle, scorched or scratched trace.

The semi-conductive insulation shield is an extruded and cross-linked semi-conductive layer which is uniformly coated on the insulation, and has a smooth surface and no sharp corners, particles, scorching or scratching marks.

The insulating structure and the performance of the crosslinked polyethylene meet the requirements of GB/T12706-2008 standard and technical specification. Basic principle of crosslinking reaction: 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 activated polyethylene molecular chains react with each other to crosslink to form crosslinked polyethylene.

The shielding, insulation and semi-conductive insulation shielding of the insulated wire core conductor adopt a three-layer co-extrusion and totally-enclosed dry-type chemical crosslinking production process. The production equipment adopts an imported three-layer co-extrusion dry-type chemical crosslinking production line with international advanced level, the cable conductor shielding, insulation and semi-conductive insulation shielding are extruded in a three-layer co-extrusion machine head, the insulation purification degree of the cable and the quality of an extruded product are ensured, the air purification degree between the feeding of the insulation material reaches 100 grade, no impurities are brought into an insulation wire core during production, and the sizes of the impurities, micropores and the like are ensured to meet the requirements of the national standard GB/T22078.

The cable core is made of non-hygroscopic filling material which is adaptive to the operation temperature of the cable, is compact and has no gap, and ensures that the cable core is not pulverized after an aging test is added to a finished cable section. The three-core cable has round shape after being formed.

The isolation sleeve adopts an extrusion type, so that the waterproof performance and the mechanical protection performance of the cable are improved.

The armor is comprised of metal tape or wire. The metal wire is a galvanized steel wire, a stainless steel wire (non-magnetic), a copper wire or a tinned copper wire, an aluminum wire or an aluminum alloy wire. The metal belt is a galvanized steel belt, a stainless steel belt (non-magnetic), an aluminum belt or an aluminum alloy belt. The steel strip is an industrial grade hot or cold rolled steel strip. 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.

The cable is formed by extruding and wrapping environment-friendly polyethylene or polyvinyl chloride or polyolefin materials of the outer sheath, the cable can prevent flame from spreading and has less smoke and no halogen gas release in case of fire, and the material of the outer sheath is adaptive to the operating temperature of the cable.

The composite production and manufacturing method of the dual-frequency RFID electronic tag and the power cable mainly comprises the following steps:

the first step is as follows: at least 2 rolls of labels are placed on the longitudinal support, and a tape storage slow release device is designed on the longitudinal support; for continuous tape change;

the second step is that: taking a coiled dual-frequency RFID label out of a longitudinal support in a chain belt mode, binding and fixing the starting end of the label and an armor layer to keep the two on the same horizontal plane, and passing through a sheath extrusion molding machine head together for continuous traction;

the third step: and (3) taking the polyethylene or polyvinyl chloride or polyolefin material, placing the polyethylene or polyvinyl chloride or polyolefin material in a sheath extruding machine for melting, and extruding the polyethylene or polyvinyl chloride or polyolefin material outside the cable core formed in the second step through a sheath extruding machine head to form the cable with the RFID label.

The fourth step: and thirdly, cooling and forming the cable produced in the third step through a water tank, and then, adopting an online electronic tag reader-writer and an ink-jet printing device to work in a linkage manner, automatically scanning and positioning the built-in dual-frequency RFID tag, and simultaneously, ink-jet printing a special mark so as to distinguish the cable in appearance.

The fifth step: after the code acquisition information is swept through the fourth step, the APP application is uploaded with cable production information data through the network, and convenience is brought to users for looking up.

The invention has the beneficial effects that: the double-frequency RFID electronic tag and the power cable are produced in a composite mode, the problem of manual code assigning construction on the spot of a customer is solved, and automatic code assigning management of the cable is achieved. Under the premise of not changing the structure and the performance of the cable, the technology-level deep fusion of the electronic tag 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 carrying out non-contact scanning on 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 of 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 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 invention has the advantages that the dual-frequency RFID label layer is designed and adopted, the anti-metal flexible high-temperature-resistant base material is used as a transfer carrier, and the anti-metal flexible high-temperature-resistant base material is uniformly distributed between the armor layer and the outer sheath layer at intervals of 1 meter. The dual-frequency RFID tag supports the work of two frequency bands of Ultra High Frequency (UHF) and High Frequency (HF) by adopting a process technology of combining precise copper etching with silver paste printing, wherein the frequency band is 860-960 MHZ and 13.0-14.5 MHZ. Designed as a dual antenna gain mode, dual loop parallel logic control units (memory cells, etc.). The air interface meets ISO/IEC 18000-6C; the number of times of erasing and writing is not less than 10 ten thousand; the service life is more than 10 years. The large-section conductor adopts a multi-layer compact structure, so that the outer diameter of the conductor is reduced; the insulation thickness is uniform, and the eccentricity is not more than 5%; the metal shielding has excellent electrical performance, small partial discharge and long-term reliable electrical guarantee, well ensures the important electrical performance index of the cable body, and meets the requirement of long-term, reliable and safe operation of medium and high voltage power cables.

Drawings

Figure 1 is a schematic radial cross-section of the cable of this embodiment,

in the figure: 1. conductor, 2, conductor shielding layer, 3, insulating layer, 4, insulating shielding layer, 5, metallic shield, 6, packing, 7, around the covering, 8, inner sheath layer, 9, armor, 10, dual-frenquency RFID label layer, 11, oversheath layer.

Detailed Description

The technical solution is further described below with reference to specific examples as follows:

the technical scheme is as follows:

the cable consists of a cable core, a wrapping layer 7, an inner sheath layer 8, an armor layer 9, a dual-frequency RFID label layer 10 and an outer sheath layer 11 which are sequentially arranged from inside to outside;

in this example, the cable core is formed by twisting three wire cores and 6 filling materials, and the cabling pitch-diameter ratio range is as follows: 70mm²The control of the aluminum core cable is 22-28, and the control of the rest is 25-35;

the wrapping layer 7 is formed by overlapping and wrapping a layer of non-hygroscopic belt material (non-woven fabric, glass fiber tape and the like);

the inner sheath layer 8 is formed by extruding polyethylene or polyvinyl chloride or polyolefin material;

the armor layer 9 is made of metal bands or metal wires;

the dual-frequency RFID tag layer 10 is an RFID electronic tag capable of supporting reading and writing of two frequency bands (high frequency HF and ultrahigh frequency UHF), the tag shares a central control logic circuit and an information storage unit, has an erasable function and has an international unique code and an EPC code;

the outer sheath layer 11 is formed by extruding polyethylene or polyvinyl chloride or polyolefin materials.

The structure of the wire core sequentially comprises a conductor 1, a conductor shielding layer 2, an insulating layer 3, an insulating shielding layer 4 and a metal shielding layer 5 from inside to outside;

the conductor 1 is divided into a copper conductor and an aluminum conductor, the copper conductor is formed by twisting bare copper monofilaments, and the diameter range of the bare copper monofilaments is 2.21-3.50 mm; the diameter of the conductor ranges from 6.0mm to 34.1 mm. The aluminum conductor is formed by twisting bare aluminum monofilaments, and the diameter range of the bare aluminum monofilaments is 2.16-4.30 mm; the diameter of the conductor ranges from 6.0mm to 34.0 mm.

The metal shielding layer 5 is formed by overlapping and wrapping soft copper tapes, the thickness of the metal shielding layer is not less than 0.10mm, the average covering rate of the wrapping is not less than 15%, and the minimum covering rate is not less than 5%.

The conductor shield 2 and the insulation shield 4 are environment-friendly peroxide cross-linking type semi-conductive shielding materials, and the main components of the shielding materials are polyolefin base materials, conductive carbon black, anti-oxidation agents, anti-copper agents and the like.

The insulating layer 3 is an environment-friendly crosslinked polyethylene insulating material with 35kV or below and low-density polyethylene as a base material and peroxide as a crosslinking agent.

The inner sheath layer 8 and the outer sheath layer 11 are formed by extruding environment-friendly polyethylene or polyvinyl chloride or polyolefin materials; the nominal thickness is 1.8 mm-3.5 mm, and the thickness of the thinnest point is not less than 85-0.1 mm of the nominal value.

The double-frequency RFID label layer 10 adopts an anti-metal flexible high-temperature-resistant base material as a transfer carrier, and the anti-metal flexible high-temperature-resistant base material is uniformly distributed between the armor layer and the outer sheath layer at intervals of 1 meter. The dual-frequency RFID tag supports the work of two frequency bands of Ultra High Frequency (UHF) and High Frequency (HF) by adopting a process technology of combining precise copper etching with silver paste printing, wherein the frequency band is 860-960 MHZ and 13.0-14.5 MHZ. Designed as a dual antenna gain mode, dual loop parallel logic control units (memory cells, etc.). The air interface meets ISO/IEC 18000-6C; the number of times of erasing and writing is not less than 10 ten thousand; the service life is more than 10 years.

The cable is manufactured by extruding a conductor shielding layer, an insulating layer and an insulating shielding layer on a copper core conductor in a production mode of three-layer co-extrusion, dry crosslinking and continuous vulcanization. The copper core conductor, the conductor shielding layer, the insulating layer and the insulating shielding layer form an insulating wire core. And a metal shielding layer is wrapped outside the insulated wire core. The three metal shielding wire cores and the filling material are combined into a cable core. The cable core is externally spirally wound with a wrapping layer. An inner sheath layer is extruded outside the wrapping layer. An armor layer is wrapped outside the inner sheath layer. And a double-frequency RFID label layer is longitudinally arranged outside the armor layer, and an outer sheath layer is extruded at the same time.

In this example:

（1）800mm²and the copper conductor with the lower section adopts a round pressing and twisting structure, the example is 300mm²A cross-sectional copper conductor.

The first step is as follows: drawing a copper rod with the diameter phi of 8mm into a copper single wire with the diameter phi of 3.33mm, wherein the tolerance requirement of the copper single wire is 3.33 +/-DEG0.01mm, the elongation of copper monofilament is more than or equal to 37 percent, and the resistivity of copper monofilament is not more than 0.017241 omega mm²And/m. The surface of the round single line is smooth and clean, and has no phenomena of scratch, oxidation and the like.

The second step is that: the copper monofilaments are stranded in layers, are arranged according to 1+6+12+18, are divided into four layers, and are compressed for three times and are distributed in a compressed mode: 6 disks, 12 disks, 18 disks. And drawing each layer of the compressed fiber by adopting dies with different sizes and different angles, setting the monofilament twist direction from inside to outside according to S, Z, S, wherein the monofilament twist direction of the secondary outer layer is Z direction, and the monofilament twist direction of the outermost layer is S direction. The strand pitch ratio of the single wires at the outermost layer is not more than 12 times.

Conductor direct current resistance at 20 ℃: less than 0.0601 omega/km;

conductor weighing sectional area: 297mm²；

The outer diameter of the conductor is 20.7 +/-0.2 mm.

(2) The conductor shielding layer, the insulating layer and the insulating shielding layer are extruded by adopting a production mode of three-layer co-extrusion, dry-process crosslinking and continuous vulcanization. The insulated wire core is processed and produced by a vertical VCV production line.

A first layer: the insulation shielding layer is made of an environment-friendly peroxide crosslinking type semi-conductive shielding material, and the nominal thickness of the insulation shielding layer is 2.5 mm. Adopt phi 80 extruder, the aircraft nose filter screen adopts four layers 20+120+80+20 (mesh), and extrusion temperature is: 80-100 ℃ 110 ℃ 112 ℃ 116 ℃ 118 ℃, the screw speed is 9.6 r/min, and the extrusion pressure is 345 bar.

A second layer: the insulating layer is made of an ultra-clean cross-linked polyethylene material and has a nominal thickness of 10.5 mm. Adopting a phi 200 extruder, adopting seven layers of 20+80+150+300+150+80+20 (meshes) for a machine head filter screen, and the extrusion temperature is as follows: 116, 118, 120 (DEG C), a screw speed of 6.0 rpm, and an extrusion pressure of 216 bar.

And a third layer: the insulation shielding layer is made of an environment-friendly peroxide crosslinking type semi-conductive shielding material, and the nominal thickness of the insulation shielding layer is 1.5 mm. Adopt phi 80 extruder, the aircraft nose filter screen adopts four layers 20+120+80+20 (mesh), and extrusion temperature is: 80-100, 112, 115, 116, 118 (DEG C), a screw rotation speed of 8.1 rpm and an extrusion pressure of 420 bar.

The sizes of the three layers of moulds are respectively as follows: phi 21.3 mm-phi 22.9 mm-phi 45.0 mm.

The average speed of the production line is 5.38 +/-0.3 m/min, the surface of the outer insulating layer is smooth, and the product has no sharp corners, particles, scorching, pressure injury, scratching and other marks.

The insulated wire core needs to be placed in a drying room at 70 +/-2 ℃ for 5 days (120 h), and the time is calculated from the surface temperature of the cable reaching 68 ℃.

Insulation eccentricity: (tmax-tmin)/tmax is less than or equal to 3 percent

Insulating thermal shrinkage: putting the wire core into an oven for 130 degrees and 6 hours, wherein the insulation shrinkage is not more than 4%;

insulation heat elongation test: the maximum elongation under load is less than or equal to 100 percent, and the permanent elongation after cooling is less than or equal to 15 percent;

insulating micropore and impurity test:

micropores greater than 0.05 mm: is free of

0.025mm to 0.05mm of micropores: less than or equal to 18 pieces/10 cm³

Opaque impurities greater than 0.125 mm: is free of

Opaque impurities with the diameter of 0.05mm to 0.125mm are less than or equal to 6 per 10cm³

Translucency greater than 0.16 mm: is free of

(3) The metal shield adopts a copper strip, the thickness is 0.10mm, the width is 40mm, and the overlapping rate of the overlapping lapping is 15-17%.

The metal shielding has an outer diameter of 44.0 +/-0.1 mm after being wrapped, and the requirements of uniform outer diameter and small overall fluctuation are met. The manufacturing process strictly controls the lower pressure of the tractor to ensure that the cables are in the same horizontal plane in production, the upper pressure of the tractor is 0.10-0.15 MPa, the tensioning pressure is 0.35-0.45 MPa, and the take-up tension is 15%.

The shielding raw material soft copper strip should be selected to meet the GB/T11091 specification, and the resistivity is not more than 0.017241 omega mm²/m。

(4) The cable core comprises three sinle silks and filler transposition, and the stranding direction: and in the right direction, the cable forming mode is that back-twist cable forming is adopted, the diameter ratio of the formed cable is 25-35, and the tension is not more than 20 kN.

The filling material is non-hygroscopic polypropylene reticular tear fiber (PP rope), the material is aged for 240h at 100 +/-2 ℃, the embrittlement phenomenon is avoided, and the roundness of the filled cable core reaches over 95 percent.

The low-smoke halogen-free flame-retardant belt is selected as a wrapping layer material, the material is formed by adopting a glass fiber belt as a base material, impregnating flame-retardant glue without any halogen and curing, and has high flame-retardant performance, the oxygen index reaches more than 70%, the specification is 0.2mm (thickness) multiplied by 60mm (width), and the width of the wrapping cover is 5-8 mm.

The outer diameter is 96.0 +/-2 mm after wrapping.

(5) The inner sheath layer is made of high-electric polyethylene sheath with nominal thickness of 2.5mm, and meets the requirement of GB/T12706 standard. The outer diameter of the inner sheath layer is 101.0 +/-2 mm. Uniform thickness, smooth surface, no bubble, crack, impurity, mechanical damage, no pore and other defects on the section.

The high-electric polyethylene sheath layer is made of high-electric polyethylene sheath material with volume resistivity not less than 1.0 multiplied by 1014 omega cm and dielectric strength not less than 26 kV/mm.

Adopting a phi 200 extruder, wherein the extrusion temperature of the extruder is as follows: 148, 175, 177, 176, 181, 180 (DEG C), wherein the head temperature is as follows: 179, 178, 179 (DEG C), 10.0 rpm of the screw, and an extrusion current of 450A.

(6) The armor layer is wrapped by double-layer galvanized steel strips in a clearance wrapping mode, the thickness is 0.8mm, the width is 60mm, and the clearance rate is 40% -45%.

The outer diameter of the steel belt is 105.0 +/-2 mm after being wrapped, and the steel belt is required to be uniform in outer diameter and small in overall fluctuation. The manufacturing process strictly controls the lower pressure of the tractor to ensure that the cables are in the same horizontal plane in production, the upper pressure of the tractor is 0.30-0.50 MPa, the tensioning pressure is 1.0-1.2 MPa, and the take-up tension is 25%.

The galvanized steel strip as the armor raw material is selected to meet the YB/T024 regulation, and the tensile strength of the galvanized steel strip is not less than 295N/mm²The elongation is not less than 20 percent, and the weight of the zinc layer of the galvanized steel strip is not less than 40g/m²。

(7) The outer sheath is made of high-electric polyethylene sheath, the nominal thickness is 4.7mm, and the requirement of GB/T12706 standard regulation is met. The overall outer diameter of the cable is 115.0 +/-2 mm. Uniform thickness, smooth surface, no bubble, crack, impurity, mechanical damage, no pore and other defects on the section.

The high-electric polyethylene sheath layer is made of high-electric polyethylene sheath material with volume resistivity not less than 1.0 multiplied by 1014 omega cm and dielectric strength not less than 26 kV/mm.

Adopting a phi 200 extruder, wherein the extrusion temperature of the extruder is as follows: 148, 175, 177, 176, 181, 180 (DEG C), wherein the head temperature is as follows: 179, 178, 179 (DEG C), a screw speed of 13.0 rpm, and an extrusion current of 495A.

Compound production of double-frequency RFID electronic tag and power cable outer sheath

The first step is as follows: at least 2 rolls of labels are placed on the longitudinal support, and a tape storage slow release device is designed on the longitudinal support; for continuous tape change;

the second step is that: taking a coiled dual-frequency RFID label out of a longitudinal support in a chain belt mode, binding and fixing the starting end of the label and an armor layer to keep the two on the same horizontal plane, and passing through a sheath extrusion molding machine head together for continuous traction;

the third step: and melting polyethylene in a sheath extruding machine, and extruding the polyethylene outside the cable core formed in the second step through a sheath extruding machine head to form the cable with the RFID label.

The fourth step: and thirdly, cooling and forming the cable produced in the third step through a water tank, and then, adopting an online electronic tag reader-writer and an ink-jet printing device to work in a linkage manner, automatically scanning and positioning the built-in dual-frequency RFID tag, and simultaneously, ink-jet printing a special mark so as to distinguish the cable in appearance.

The fifth step: after the code acquisition information is swept through the fourth step, the APP application is uploaded with cable production information data through the network, and convenience is brought to users for looking up.

As a result, the cable has the characteristics that:

(1) rated system voltage Uo/U: 26/35kV, maximum operating voltage Um: 40.5 kV;

(2) the conductor allows long-term working temperature when the cable normally runs as follows: 90 ℃;

(3) in the case of short circuits (maximum duration of not more than 5 seconds), the maximum temperature allowed for the cable conductor is 250 ℃.

(4) Indexes of partial discharge test: 1.73U0 (45 kV) voltage, without any detectable discharge produced by the cable under test that exceeds the sensitivity of the claim test (45 kV, the sensitivity of the claim test is less than 6pC, better than 10pC specified by national standards);

(5) insulating structure size: eccentricity (tmax-tmin)/tmax is less than or equal to 3%, tmin is greater than or equal to 0.95tn (tn is the nominal thickness, and the minimum thickness and the maximum thickness of any same section of tmin and tmax) (which is superior to the requirement of less than or equal to 15% specified by national standard);

(6) power frequency withstand voltage test: applying 3.5Uo (91 kV) voltage for 5min to prevent insulation breakdown;

(7) insulation heat elongation test: the maximum elongation under load is less than or equal to 100 percent (which is better than the requirement of less than or equal to 175 percent specified by the national standard), and the permanent elongation after cooling is less than or equal to 5 percent (which is better than the requirement of less than or equal to 15 percent specified by the national standard);

(9) insulating micropore and impurity test: the ultra-clean XLPE insulating material, an advanced frictionless gravity feeding system and a high-grade insulating and purifying system (100-grade insulating and feeding room) are adopted to control the sizes of insulating impurities and micropores to be optimal and obviously higher than the standard requirement of GB/T22078;

micropores greater than 0.05 mm: is free of

0.025mm to 0.05mm of micropores: less than or equal to 18 pieces/10 cm³

Opaque impurities greater than 0.125 mm: is free of

Opaque impurities with the diameter of 0.05mm to 0.125mm are less than or equal to 6 per 10cm³

Translucency greater than 0.16 mm: is free of

(10) The dual-frequency RFID electronic tag is compounded with the outer sheath of the power cable, so that the electronic tag is effectively protected, the metal resistance is obviously enhanced, the contactless reading distance can be stabilized at about 100cm, and the longest length can reach about 120 cm. The electronic tag has high temperature resistance and stress resistance, can bear the extrusion molding high temperature of 160 ℃, and is not damaged by stretching and extruding. The dual-frequency RFID tag supports the work of two frequency bands of Ultra High Frequency (UHF) and High Frequency (HF) by adopting a process technology of combining precise copper etching with silver paste printing, wherein the frequency band is 860-960 MHZ and 13.0-14.5 MHZ. Designed as a dual antenna gain mode, dual loop parallel logic control units (memory cells, etc.). The air interface meets ISO/IEC 18000-6C; the number of times of erasing and writing is not less than 10 ten thousand; the service life is more than 10 years.

Claims (10)

1. A manufacturing method of an intelligent power cable based on a dual-frequency RFID technology comprises the following steps:

1) manufacturing a wire core for later use;

2) taking the wire core prepared in the step 1), and stranding the wire core and the filler together to obtain a cable core;

3) the cable prepared in the step 2) is sequentially wrapped with an armor layer and an outer sheath layer, and the method is characterized in that

In the step 3), the armor layer is wrapped outside the cable core prepared in the step 2), and then a double-frequency RFID electronic tag and power cable outer sheath layer composite production process is adopted, wherein the steps comprise:

3.1) at least 2 rolls of RFID electronic tags are placed on the longitudinal support;

3.2) the coiled RFID label is discharged from the longitudinal support in a chain belt mode, the starting end of the label is bound and fixed with the armor layer, so that the label and the armor layer are at the same horizontal height, and the chain belt where the label is located and a cable wrapping the armor layer penetrate through a sheath extrusion molding machine head for extruding the outer sheath layer together and are continuously pulled;

3.3) melting the sheath material for manufacturing the outer sheath layer in an extruding machine, and extruding the sheath material by a machine head of the extruding machine outside the semi-finished product of the cable manufactured in the step 3.2) to obtain the cable with the RFID label;

3.4) after the cable prepared in the step 3.3) is cooled and formed, spraying marks at the positions of the RFID labels of the cable, wherein the method comprises the steps of reading the information of the RFID labels and identifying the positions of the RFID labels by an RFID label reader-writer, and simultaneously spraying the marks by ink-jet printing equipment in a linkage manner;

3.5) transmitting the RFID label information and the cable production information data to a database through the RFID label information prepared in the step 3.4).

2. The manufacturing method according to claim 1, wherein in the step 1):

1.1) preparing metal monofilaments:

drawing a copper rod with the diameter phi of 8mm into a copper single wire with the diameter phi of 3.33mm, wherein the tolerance requirement of the copper single wire is 3.33 +/-0.01 mm, the elongation of the copper single wire is more than or equal to 37 percent, and the resistivity of the copper single wire is not more than 0.017241 omega mm²/m；

Adopting a stranding machine to layer and strand the copper monofilaments: the copper monofilament is arranged by 1, 6, 12 and 18 monofilaments in sequence from the inner layer to the outer layer, and is divided into four layers to be compressed for three times, and each layer is compressed and sequentially distributed: 6 wire coils, 12 wire coils and 18 wire coils;

drawing each layer of compact by adopting a die with a corresponding size and angle, setting the monofilament direction from inside to outside according to S, Z, S, wherein the monofilament direction of the secondary outer layer is Z direction, and the monofilament direction of the outermost layer is S direction; the ratio of the twisted pitch of the single wires at the outermost layer is not more than 12 times;

the prepared conductor has the following requirements: the direct current resistance of the conductor at 20 ℃ is less than 0.0601 omega/km; the conductor has a weighed cross-sectional area of 297mm²(ii) a The outer diameter of the conductor is 20.7 +/-0.2 mm;

1.2) extruding and coating a conductor shielding layer, an insulating layer and an insulating shielding layer by adopting a production mode of three-layer co-extrusion, dry-process crosslinking and continuous vulcanization to obtain an insulating wire core; the insulated wire core is processed and produced by a vertical VCV production line:

insulating shielding layer: the insulation shielding layer is prepared by extruding and wrapping an environment-friendly peroxide cross-linking type semi-conductive shielding material, and the nominal thickness of the insulation shielding layer is 2.5 mm;

the extrusion package adopts a phi 80 extruder, and the filter screen of the machine head adopts four layers which are respectively 20 meshes, 120 meshes, 80 meshes and 20 meshes; the temperature of the 1 st-8 th temperature zone of the extruder is respectively as follows: 80 ℃, 100 ℃, 110 ℃, 112 ℃, 115 ℃, 116 ℃ and 118 ℃, the screw rotating speed of the extruder is 9.6 revolutions per minute, and the extrusion pressure is 345 bar;

insulating layer: the insulating layer is made of an ultra-clean cross-linked polyethylene material by extrusion, and the nominal thickness of the insulating layer is 10.5 mm;

the extrusion package adopts a phi 200 extruder, the filter screen of the machine head adopts seven layers which are respectively 20 meshes, 80 meshes, 150 meshes, 300 meshes, 150 meshes, 80 meshes and 20 meshes, and the temperatures of 1 st to 8 th temperature zones of the extruder are respectively as follows: 116 ℃, 118 ℃ and 120 ℃, the screw speed of the extruder is 6.0 revolutions per minute, and the extrusion pressure is 216 bar;

conductor shielding layer: the insulation shielding layer is prepared by extruding and wrapping an environment-friendly peroxide cross-linking type semi-conductive shielding material, and the nominal thickness of the conductor shielding layer is 1.5 mm;

the extrusion package adopts a phi 80 extruder, and the filter screen of the machine head adopts four layers which are respectively 20 meshes, 120 meshes, 80 meshes and 20 meshes; the temperature of the 1 st-8 th temperature zone of the extruder is respectively as follows: 80 ℃, 100 ℃, 110 ℃, 112 ℃, 115 ℃, 116 ℃ and 118 ℃, the screw rotation speed of the extruder is 8.1 r/min, and the extrusion pressure is 420 bar;

the sizes of the three layers of the mold are respectively as follows: phi 21.3mm, phi 22.9mm and phi 45.0 mm;

the average speed of the production line is 5.38 +/-0.3 m/min;

1.3) placing the prepared insulated wire core into a drying room at 70 +/-2 ℃ for processing for 120h, and calculating the starting time from the surface temperature of the insulated wire core to 68 ℃;

1.4) wrapping a metal shielding layer, comprising the following steps:

adopting copper strips with the thickness of 0.10mm and the width of 40mm to be lapped and wrapped outside the insulated wire core in the step 1.3); the lapping rate of the lapping is 15% -17%; the outer diameter of the wrapped cable is 44.0 +/-0.1 mm;

in the manufacturing process, the lower pressure of a tractor is controlled to enable the cables in the production process to be at the same horizontal height, the upper pressure of the tractor is 0.10-0.15 MPa, the tensioning pressure is 0.35-0.45 MPa, and the take-up tension is 1500-3000N; the copper strip conforms to the GB/T11091 specification, and the resistivity of the copper strip does not exceed 0.017241 omega mm²/m。

3. The manufacturing method according to claim 1, wherein in the step 2), three wire cores obtained in the step 1) and the filling material are stranded;

the cabling direction is the right direction; the cabling mode is that untwisting cabling is adopted, the diameter ratio of cabling nodes ranges from 25 to 35, and the tension is not more than 20 kN;

the filling material is non-hygroscopic polypropylene reticular tear fiber, and the material is required to be aged at 100 +/-2 ℃ for 240 hours without embrittlement;

the roundness of the filled cable core reaches more than 95 percent.

4. The manufacturing method according to claim 1, wherein in the step 2), an additional step of: attaching 1) wrapping a wrapping layer outside the cable core; attaching 2) wrapping an inner sheath layer outside the wrapping layer;

in the step 1), the wrapping layer is made of low-smoke halogen-free flame-retardant tapes by wrapping; the oxygen index of the low-smoke halogen-free flame-retardant tape is more than 70%, the specification of the low-smoke halogen-free flame-retardant tape is that the thickness is 0.2mm, the width is 60mm, and the width of the lapping cover is 5-8 mm; the outer diameter is 96.0 +/-2 mm after wrapping;

in the step 2), the inner sheath layer is prepared by extruding and wrapping high-electric polyethylene sheath materials; the nominal thickness of the inner sheath layer is 2.5mm, and the requirement of GB/T12706 standard regulation is met; the outer diameter of the inner sheath layer is 101.0 +/-2 mm; the high-electric polyethylene sheath material is a polyethylene sheath material with volume resistivity not less than 1.0 multiplied by 1014 omega cm and dielectric strength not less than 26 kV/mm;

the extrusion package adopts a phi 200 extruding machine, and the temperature of the 1 st to 9 th temperature areas of the extruding machine is respectively as follows: 148 deg.C, 175 deg.C, 178 deg.C, 177 deg.C, 176 deg.C, 175 deg.C, 176 deg.C, 181 deg.C and 180 deg.C; the temperatures of the four temperature zones of the handpiece are respectively as follows: 179 ℃, 178 ℃ and 179 ℃, the screw speed of the extruder being 10.0 revolutions per minute, the extrusion current being 450A.

5. The manufacturing method according to claim 1, wherein in the step 3), the armor layer is made by gap wrapping of double galvanized steel strips, the thickness of the galvanized steel strips is 0.8mm, the width of the galvanized steel strips is 60mm, and the gap rate of the gap wrapping is 40-45%; the outer diameter of the cable after wrapping is 105.0 +/-2 mm; in the manufacturing process, the lower pressure of a tractor is controlled to enable the cables in the production process to be at the same horizontal height, the upper pressure of the tractor is 0.30-0.50 MPa, the tensioning pressure is 1.0-1.2 MPa, and the take-up tension is 2500-4000N;

the galvanized steel strip conforms to the YB/T024 regulation and the tensile strength of the galvanized steel strip is not less than 295N/mm²Elongation of not less than 20%, and zinc layer weight of galvanized steel strip≥40g/m²。

6. The manufacturing method according to claim 1, wherein in the step 3), the outer sheath layer is extruded from a high electric polyethylene sheath material; the nominal thickness of the outer sheath layer is 4.7mm, and the requirement of GB/T12706 standard regulation is met; the overall outer diameter of the prepared cable is 115.0 +/-2 mm;

the high-electric polyethylene sheath material is a sheath material with volume resistivity not less than 1.0 multiplied by 1014 omega cm and dielectric strength not less than 26 kV/mm;

the extrusion coating sheath material adopts a phi 200 plastic extruding machine, and the temperature of the 1 st to 9 th temperature areas of the plastic extruding machine is respectively as follows: 148 ℃, 175 ℃, 178 ℃, 177 ℃, 176 ℃, 175 ℃, 176 ℃, 181 ℃ and 180 ℃, wherein the four temperature zones of the handpiece have the following temperatures: 179 ℃, 178 ℃ and 179 ℃, the screw speed of the extruder is 13.0 revolutions per minute and the extrusion current is 495A.

7. The utility model provides an intelligence power cable based on dual-frenquency RFID technique, includes cable core and the sheath structure of parcel outside the cable core, its characterized in that: also includes a plurality of dual-frequency RFID tags;

the dual-frequency RFID tag is a strip-shaped sheet structure; the dual-frequency RFID tag supports two frequency bands of 860 MHz-960 MHz ultrahigh frequency UHF and 13.0 MHz-14.5 MHz high frequency HF;

the sheath structure comprises an armor layer and an outer sheath layer, and the armor layer is covered outside the cable core;

the dual-frequency RFID tag is arranged between the armor layer and the outer sheath layer; the double-frequency RFID tags are uniformly arranged at intervals along the axial direction of the cable;

the armor layer is formed by wrapping metal strips in a clearance mode; or the armor layer is formed by wrapping a plurality of metal wires;

the outer sheath layer is formed by extruding and wrapping environment-friendly polyethylene, polyvinyl chloride or polyolefin sheath materials.

8. The dual-band RFID technology-based smart power cable of claim 7, wherein the sheath structure further comprises a wrapping layer and an inner sheath layer; the cable core is externally provided with a wrapping layer, the wrapping layer is externally provided with an inner sheath layer, and the inner sheath layer is externally provided with an armor layer;

the nominal thickness of the inner sheath layer is 1.8 mm-3.5 mm, and the thickness of the thinnest point is not less than 85-0.1 mm of the nominal value; the inner sheath layer is formed by extruding and wrapping environment-friendly polyethylene, polyvinyl chloride or polyolefin materials;

the wrapping layer is formed by overlapping and wrapping a layer of non-hygroscopic strip material; the thickness of the wrapping layer is 0.3mm, and the covering rate range is 15-25%.

9. The intelligent power cable based on the dual-frequency RFID technology as claimed in claim 7 or 8, wherein the cable core is formed by twisting a plurality of wire cores and filling materials;

the structure of the wire core is as follows: the conductor, the conductor shielding layer, the insulating shielding layer and the metal shielding layer are arranged from inside to outside in sequence;

the conductor is a copper conductor; the copper conductor is formed by twisting bare copper monofilaments, and the diameter range of the bare copper monofilaments is 2.21-3.50 mm; the diameter range of the conductor is 6.0 mm-34.1 mm;

alternatively, the conductor is an aluminum conductor; the aluminum conductor is formed by twisting bare aluminum monofilaments, and the diameter range of the bare aluminum monofilaments is 2.16-4.30 mm; the diameter range of the conductor is 6.0 mm-34.0 mm;

the conductor shielding layer and the insulation shielding layer are both made of environment-friendly peroxide cross-linked semi-conductive shielding materials; the thickness of the conductor shielding layer is 0.8 mm; the thickness of the insulating shielding layer is 1.0 mm;

the insulating layer is made of cross-linked polyethylene environment-friendly insulating material; the thickness of the insulating layer is 4.5 mm;

the metal shielding layer is formed by soft copper tapes which are lapped and lapped in an overlapping mode; the thickness of the soft copper strip is not less than 0.10mm, the average covering rate of the overlapped wrapping is not less than 15%, and the minimum covering rate is not less than 5%.

10. The intelligent power cable based on the dual-frequency RFID technology as claimed in claim 7 or 8, wherein the cable core is formed by twisting three wire cores and filling materials, and the cable pitch-diameter ratio range of the cable core is as follows:

the cross-sectional area is 70mm²And the following aluminum core cables, the cabling pitch-diameter ratio is 22-28; the cross-sectional area is more than 70mm²The cabling pitch-diameter ratio of the aluminum core cable is 25-35;

the cabling pitch-diameter ratio of the copper core cable is 25-35;

the armor layer is formed by wrapping gaps of metal strips in a wrapping mode, the thickness range of the metal strips is 0.4-0.9 mm, and the gap rate is 40% -45%;

or the armor layer is formed by wrapping a plurality of metal wires; the sum of the gaps between the metal steel wires does not exceed the diameter of one metal wire;

the nominal thickness of the outer sheath layer is 1.8 mm-3.5 mm, and the thickness of the thinnest point is not less than 85-0.1 mm of the nominal value;

the double-frequency RFID tags are uniformly distributed between the armor layer and the outer sheath layer at intervals of 1 meter.

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