CN111489860A - Nuclear-electromagnetic-resistant multi-core pulse direct current cable - Google Patents
Nuclear-electromagnetic-resistant multi-core pulse direct current cable Download PDFInfo
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- CN111489860A CN111489860A CN202010337572.4A CN202010337572A CN111489860A CN 111489860 A CN111489860 A CN 111489860A CN 202010337572 A CN202010337572 A CN 202010337572A CN 111489860 A CN111489860 A CN 111489860A
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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
- H01B9/006—Constructional features relating to the conductors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B9/00—Power cables
- H01B9/003—Power cables including electrical control or communication wires
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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 electric wires and cables, and particularly relates to a nuclear-electromagnetic-resistant multi-core pulse direct current cable which comprises a conductor, an insulator, a central filling core, a shielding layer and a sheath, wherein the conductor is wrapped by the insulator to serve as a current-carrying electric wire core, a plurality of current-carrying electric wire cores are closely arranged and stranded outside the central filling core to form a cable with a multi-layer structure, the shielding layer is wrapped outside the cable, and the sheath is wrapped outside the shielding layer; the current-carrying wire cores are divided into positive wire cores A and negative wire cores B, the positive wire cores A and the negative wire cores B of the same layer are alternately arranged, and two adjacent positive wire cores A and two adjacent negative wire cores B of the same layer form a group of loops; or all the positive wire cores A and the negative wire cores B in the cable are connected in parallel in a crossing manner to form a loop. According to the invention, through the optimized arrangement of the current-carrying wire cores, stray electromagnetic fields in any axial direction can be reduced or offset, the high-current power transmission quality is ensured, and the electric corrosion to equipment around the cable is reduced.
Description
Technical Field
The invention belongs to the technical field of wires and cables, and particularly relates to a nuclear-electromagnetic-resistant multi-core pulse direct-current cable.
Background
The current required by many high-energy equipment is in the kilo-ampere level or even larger, and the device is powered by a pulse direct-current power supply system and is transmitted to the equipment through a cable. At present, single-core or two-core stranded cables are generally adopted for direct current transmission, but for high-current direct current pulse equipment, the cables have serious defects. According to the regulations of GJB4000-2000 ship universal specifications and the like, a single-core cable is required to be avoided for both the alternating current system and the direct current system, because the single-core direct current cable needs two cables to form a loop, the distance between loop conductors is large, stray current is easy to generate electric corrosion on surrounding equipment, and the performance and the safe service life of the equipment are influenced; if the two-core cable transmits large current, the specification is large, the two-core cable is heavy and difficult to bend, and the electromagnetic effect and the electric power of the cable are easy to influence the equipment due to frequent and short-time power supply of the equipment.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides the nuclear-electromagnetic-resistant multi-core pulse direct current cable, and the structure of the nuclear-electromagnetic-resistant multi-core pulse direct current cable is optimized, so that the generation of a stray electric field can be reduced while large current can be transmitted, and the defects in the prior art are effectively overcome.
The specific scheme of the invention is as follows:
a nuclear-electromagnetic-resistant multi-core pulse direct current cable comprises a conductor, insulation, a central filling core, a shielding layer and a sheath, wherein the insulation wraps the conductor to serve as a current-carrying electric wire core, a plurality of current-carrying electric wire cores are closely arranged and stranded outside the central filling core to form a cable with a multi-layer structure, the shielding layer wraps the cable, and the sheath wraps the shielding layer;
the current-carrying cable cores are divided into positive cable cores A and negative cable cores B, the positive cable cores A and the negative cable cores B of the same layer are alternately arranged, and two adjacent positive cable cores A and two adjacent negative cable cores B of the same layer form a group of loops; or all the positive wire cores A and the negative wire cores B in the cable are connected in parallel in a crossing manner to form a loop.
Wherein, the current-carrying wire cores of the same radial direction multilayer are arranged according to the mode of alternately arranging the positive wire core A and the negative wire core B.
The direct current cable also comprises a control wire core and/or a cable filler, wherein the control wire core and/or the cable filler are closely arranged with a plurality of current-carrying wire cores and are stranded outside the central filler to form a cable with a multilayer structure.
Wherein, the central filling core is formed by twisting a plurality of strands of aramid fiber 1670dtex/1000F into strands, the linear density is not less than 1500dtex, the breaking strength is not less than 19cN/dtex, the elongation at break is (3.5 +/-1)%, the modulus is (90 +/-15) GPa, and the oil content is (1 +/-0.5)%.
The insulation is prepared from a tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer, the insulation is extruded into a pipe type extrusion process by a melting method, the drawing ratio is set to be 40-130, the drawing balance degree is 1.05-1.2, the extrusion temperature of an extruder is respectively (330 +/-10) ° C, (345 +/-10) ° C, (355 +/-10) ° C and (360 +/-10) ° C from 1 area to 4 areas, the temperature of a flange, a nose and a die opening is respectively (320 +/-10) ° C, (375 +/-10) ° C and (380 +/-10) ° C, the rotating speed of a screw is 15-20 n/min, the current of the screw is 8-10A, the voltage of a paying-off tension is 10-12V, the hanging weight of the paying-off tension is 10-15 kg, and the hanging weight of the paying-off tension is 10-12 kg.
The control wire core comprises an insulated wire core formed by a conductor and insulation, and the control wire core is formed by overlapping and wrapping a copper-plastic composite tape for shielding after the plurality of insulated wire cores are twisted.
The cable comprises a cable body, a shielding layer, a nickel-plated copper wire woven layer, an aluminum-plastic composite tape wrapping isolation layer, a tinned copper wire woven layer and a second conductive cloth wrapping layer, wherein the shielding layer is sequentially provided with a first conductive cloth wrapping layer, a nickel-plated copper wire woven layer, an aluminum-plastic composite tape wrapping isolation layer, a tinned copper wire woven layer and a second conductive cloth wrapping layer from inside to outside, and the first conductive cloth wrapping layer is wrapped outside.
The first conductive cloth wrapping layer, the second conductive cloth wrapping layer and the aluminum-plastic composite tape wrapping isolation layer are 0.05mm in thickness, the wrapping covering rate is 40% -50%, and the wrapping directions of the layers are opposite; the braided nickel-plated copper wire layer and the braided tin-plated copper wire layer have the braided wire diameter of 0.15mm, the braided angle of 60-70 degrees and the braided density of 90-95 percent.
The conductive cloth of the first conductive cloth wrapping layer and the second conductive cloth wrapping layer is composed of copper, nickel and polyester fibers, the surface resistance of the conductive cloth is not more than 0.03 omega, the abrasion resistance is not less than 10 ten thousand times, and the shielding effectiveness is not less than 60dB (10 MHz-3 GHz).
Wherein the sheath is prepared from a thermoplastic polyester elastomer or a polyether polyurethane elastomer.
Advantageous effects
According to the invention, through the optimized arrangement of the current-carrying wire cores, stray electromagnetic fields in any axial direction can be reduced or offset, the high-current power transmission quality is ensured, and the electric corrosion to equipment around the cable is reduced. The multi-core is crossed and closely connected in parallel, so that the defects of a single-core direct current cable and a two-core direct current cable are avoided, and the wire cores are closely connected; the PFA insulation enables the insulation thickness of the conductor with the same specification to be reduced by about 0.5mm compared with the insulation thickness of a general insulation material, so that the outer diameter and the weight of the cable are reduced, and the rated current-carrying capacity of the cable can be improved by the temperature-resistant grade of the conductor with the highest rated working temperature of 250 ℃. Excellent nuclear electromagnetic shielding resistance: the multilayer combined shielding mode for controlling the overlapping rate, the weaving angle and the density ensures that the shielding effectiveness of the finished product is not less than 70dB under the conditions of electromagnetic pulse field intensity of 50kV/m, rising edge of 2.5ns and half-height width of 23 ns. The finished product has excellent performances of nuclear electromagnetic resistance, low air pressure resistance, low temperature resistance, sunlight resistance, salt fog resistance, mould resistance, wind, sand, rain, snow, hail resistance and the like, and can normally work under the following natural and induced environmental conditions.
Drawings
FIG. 1 is a schematic view of an inventive cable
Wherein, 1 is the conductor, 2 is insulating, 3 is the control sinle silk, 4 is central filling core, 5 is the shielding layer, 6 is the sheath, and A is anodal sinle silk, and B is the negative pole sinle silk.
Detailed Description
The nuclear-electromagnetic-resistant multi-core pulse direct-current cable comprises a conductor 1, an insulator 2, a central filling core 4, a shielding layer 5 and a sheath 6, wherein the insulator 2 wraps the conductor 1 to serve as a current-carrying electric wire core, a plurality of current-carrying electric wire cores are closely arranged and are stranded outside the central filling core 4 to form a cable with a multi-layer structure, the shielding layer 5 wraps the cable, and the sheath 6 wraps the shielding layer 5. The current-carrying wire core is divided into a positive wire core A and a negative wire core B, and the positive wire core A and the negative wire core B of the same layer are alternately arranged.
According to the cable, adjacent positive wire cores A and adjacent negative wire cores B on the same layer can form a group of loops, and the wire cores are not repeatedly used between the loops; or all the positive wire cores A and the negative wire cores B in the cable are connected in parallel in a crossed mode to form a loop, and by the alternate arrangement mode, stray electromagnetic fields in any axial direction can be reduced or offset, the stray electromagnetic fields are reduced to the minimum, the high-current power transmission quality is guaranteed, and the electric corrosion to equipment around the cable is reduced.
Wherein preferred, the current-carrying sinle silk of multilayer in same footpath sets up according to positive pole sinle silk A and negative pole sinle silk B mode of arranging in turn. So arranged, stray electromagnetic fields generated by the cable can be further reduced.
Specifically, the cable of the present invention may further include a control wire core 3 and/or a cable filler, wherein the control wire core 3 and/or the cable filler is closely arranged with a plurality of current carrying wire cores and stranded outside the central filler 4 to form a cable having a multi-layer structure.
Specifically, the central filling core 4 is formed by twisting a plurality of aramid fibers 1670dtex/1000F into a strand, the linear density is not less than 1500dtex, the breaking strength is not less than 19cN/dtex, the breaking elongation is (3.5 +/-1)%, the modulus is (90 +/-15) GPa, and the oil content is (1 +/-0.5)%, so that the effects of stabilizing the structure and enhancing the tensile strength are realized.
Specifically, the conductor 1 is a silver-plated or nickel-plated stranded copper wire, has high temperature resistance and can bear the high temperature grade of fluoroplastic insulation.
Specifically, the insulation 2 adopts tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA for short), a perfluoroalkoxy side chain has an obvious melting point by combining oxygen atoms, and the defect that polytetrafluoroethylene is difficult to process is overcome on the basis of keeping excellent electrical insulation, mechanical property and high-temperature-resistant thermal stability of the polytetrafluoroethylene.
Specifically, the insulation 2 is extruded into a pipe by a melting method, the stretching ratio is set to be controlled to be 40-130, the stretching balance degree is 1.05-1.2, the extrusion temperature of an extruder is respectively (330 +/-10) ° C, (345 +/-10) ° C, (355 +/-10) ° C and (360 +/-10) ° C from 1 area to 4 area, the temperature of a flange, a machine head and a die orifice is respectively (320 +/-10) ° C, (375 +/-10) ° C and (380 +/-10) ° C, the screw rotating speed is 15-20 n/min, the screw current is 8-10A, the paying-off tension voltage is 10-12V, the paying-off tension weight is 10-15 kg, and the taking-up tension weight is 10-12 kg. Through the extrusion process, thin insulation can be obtained, the insulation thickness of the conductor with the same specification can be reduced by about 0.5mm compared with that of a general insulation material, so that the outer diameter and the weight of the cable are reduced, and the rated current-carrying capacity of the cable can be improved by the temperature-resistant grade of 250 ℃.
Specifically, the control wire core 3 comprises an insulated wire core formed by a conductor 1 and an insulation 2, and the control wire core 3 is formed by overlapping and wrapping a copper-plastic composite tape for shielding after the insulated wire cores are twisted. So set up, can be so that not influence each other between messenger control sinle silk 3 and the current-carrying electric wire core to realize the compatibility requirement of temperature resistant grade.
Specifically, the shielding layer 5 is sequentially a first conductive cloth wrapping layer, a nickel-plated copper wire woven layer, an aluminum-plastic composite tape wrapping isolation layer, a tin-plated copper wire woven layer and a second conductive cloth wrapping layer from inside to outside, and the first conductive cloth wrapping layer is wrapped outside the cable. The first conductive cloth and the second conductive cloth are compounded by magnetic materials and non-magnetic materials, so that both electric shielding and magnetic shielding under high and low frequencies can be considered. The shielding layer 5 is provided with a plurality of layers of reflection, so that interference electromagnetic waves are sufficiently weakened, and the electromagnetic shielding efficiency is improved. The shielding layer 5 adopts a combined wrapping and weaving process, the thicknesses of the conductive cloth wrapping layer and the aluminum-plastic composite tape wrapping isolation layer are both 0.05mm, the wrapping overlapping rate is 40-50%, and the wrapping directions of all layers are opposite; the braided nickel-plated copper wire layer and the braided tinned copper wire layer have the braided wire diameter of 0.15mm, the braiding angle of 60-70 degrees and the braiding density of 90-95 degrees, and the softness of the product is improved and the shielding efficiency is enhanced by controlling the overlapping rate, the braiding angle and the multilayer combined shielding mode of the density.
Preferably, the conductive cloth of the conductive cloth wrapping layer is composed of copper, nickel and polyester fibers, composite metal powder is uniformly plated on the surface of the plain cloth belt, the surface resistance of the conductive cloth is not more than 0.03 omega, the abrasion resistance is not less than 10 ten thousand times, and the shielding effectiveness is not less than 60dB (10 MHz-3 GHz).
The shielding effectiveness of the finished product of the shielding layer 5 prepared by the scheme is not less than 70dB under the conditions of electromagnetic pulse field intensity of 50kV/m, rising edge of 2.5ns and half-height width of 23 ns.
Specifically, the sheath 6 is made of Thermoplastic Polyester Elastomer (TPE) or polyether polyurethane elastomer (PUR) to meet the severe special environmental conditions. TPE has the properties of vulcanized rubber, has outstanding mechanical strength, excellent rebound resilience and wide use temperature, and particularly has the properties of vulcanized rubber and the processing characteristics of thermoplastic plastics. The polyurethane elastomer has the performance characteristics of small specific gravity, excellent elasticity, excellent tensile property and wear resistance, good mechanical strength, oil resistance, ozone resistance, low temperature property and flexibility, the use environment temperature can reach-50 ℃, the polyether polyurethane has hydrolytic resistance and chemical corrosion resistance in the environment with fresh water, seawater or high humidity, can effectively resist weather erosion, has low friction or anti-sticking property when meeting water, is in mutual contact sliding between cables, has small moving resistance, and is particularly suitable for frequently winding or moving the sheath of the cable under severe working condition environment.
Claims (10)
1. The nuclear-electromagnetic-resistant multi-core pulse direct current cable is characterized by comprising a conductor (1), an insulator (2), a central filling core (4), a shielding layer (5) and a sheath (6), wherein the insulator (2) wraps the conductor (1) to serve as a current-carrying wire core, a plurality of current-carrying wire cores are closely arranged and stranded outside the central filling core (4) to form a cable with a multilayer structure, the cable is wrapped with the shielding layer (5), and the sheath (6) is wrapped outside the shielding layer (5);
the current-carrying cable cores are divided into positive cable cores A and negative cable cores B, the positive cable cores A and the negative cable cores B of the same layer are alternately arranged, and two adjacent positive cable cores A and two adjacent negative cable cores B of the same layer form a group of loops; or all the positive wire cores A and the negative wire cores B in the cable are connected in parallel in a crossing manner to form a loop.
2. The direct current cable according to claim 1, wherein the current-carrying wire cores of the plurality of layers in the same radial direction are arranged in an alternating arrangement of the positive wire cores a and the negative wire cores B.
3. The direct current cable according to claim 1, further comprising a control wire core (3) and/or a cable filler core, wherein the control wire core (3) and/or the cable filler core is closely arranged with a plurality of current carrying wire cores and stranded outside the central filler core (4) to form a cable having a multi-layer structure.
4. The direct current cable according to claim 1, wherein the central filling core (4) is stranded into a strand by using a plurality of aramid fibers 1670dtex/1000F, the linear density is not less than 1500dtex, the breaking strength is not less than 19cN/dtex, the elongation at break is (3.5 +/-1)%, the modulus is (90 +/-15) GPa, and the oil content is (1 +/-0.5)%.
5. The direct current cable according to claim 1, wherein the insulation (2) is made of a tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer, the insulation (2) is extruded out of a tube by a melting method, a draw ratio is set to be 40-130, a draw balance degree is 1.05-1.2, extrusion temperatures of 1 zone to 4 zones of an extruder are (330 ± 10), (345 ± 10), (355 ± 10), (360 ± 10), temperatures of a flange, a nose and a die orifice are (320 ± 10), (375 ± 10) and (380 ± 10) respectively, a screw rotation speed is 15-20 n/min, a screw current is 8-10A, a pay-off tension voltage is 10-12V, a pay-off tension weight is 10-15 kg, and a take-up tension weight is 10-12 kg.
6. The direct current cable according to claim 3, wherein the control wire core (3) comprises an insulated wire core formed by a conductor (1) and an insulation (2), and the control wire core (3) is formed by stranding a plurality of insulated wire cores and then externally overlapping and wrapping a copper-plastic composite tape for shielding.
7. The direct current cable of claim 1, wherein the shielding layer (5) comprises, from inside to outside, a first conductive cloth wrapping layer, a nickel-plated copper wire woven layer, an aluminum-plastic composite tape wrapping isolation layer, a tin-plated copper wire woven layer and a second conductive cloth wrapping layer in sequence, and the first conductive cloth wrapping layer is wrapped outside the cable.
8. The direct current cable of claim 7, wherein the first and second conductive cloth wrapping layers and the aluminum-plastic composite tape wrapping isolation layer are 0.05mm thick, the wrapping lapping rate is 40% -50%, and the wrapping directions of the layers are opposite; the braided nickel-plated copper wire layer and the braided tin-plated copper wire layer have the braided wire diameter of 0.15mm, the braided angle of 60-70 degrees and the braided density of 90-95 percent.
9. The direct current cable of claim 7, wherein the conductive cloth of the first and second conductive cloth wrapping layers is made of copper, nickel and polyester fiber, and has a surface resistance of not more than 0.03 Ω, an abrasion resistance of not less than 10 ten thousand times, and a shielding effectiveness of not less than 60dB (10MHz to 3 GHz).
10. A direct current cable according to claim 1, characterized in that said sheath (6) is made of a thermoplastic polyester elastomer or a polyether polyurethane elastomer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010337572.4A CN111489860A (en) | 2020-04-26 | 2020-04-26 | Nuclear-electromagnetic-resistant multi-core pulse direct current cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010337572.4A CN111489860A (en) | 2020-04-26 | 2020-04-26 | Nuclear-electromagnetic-resistant multi-core pulse direct current cable |
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| CN111489860A true CN111489860A (en) | 2020-08-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010337572.4A Pending CN111489860A (en) | 2020-04-26 | 2020-04-26 | Nuclear-electromagnetic-resistant multi-core pulse direct current cable |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024017243A1 (en) * | 2022-07-22 | 2024-01-25 | 前微科技(上海)有限公司 | Cable and electrical device using said cable |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2909217A1 (en) * | 2006-11-29 | 2008-05-30 | Commissariat Energie Atomique | High electro-magnetic immunity electric cable for transmitting impulse signal, has two protection layers for protecting mineral dielectric layer, where layers are arranged on conducting central core |
| CN104240836A (en) * | 2014-09-02 | 2014-12-24 | 淮南新光神光纤线缆有限公司 | Super-soft nuclear-resistant electromagnetic pulse control cable |
| CN204066798U (en) * | 2014-06-03 | 2014-12-31 | 淮南新光神光纤线缆有限公司 | A kind of light-duty high anti-nuclear electromagnetic pulse composite cable |
| CN105047298A (en) * | 2015-06-12 | 2015-11-11 | 南京全信传输科技股份有限公司 | 1553B bus cable for astronavigation |
| CN209249191U (en) * | 2018-12-03 | 2019-08-13 | 核工业西南物理研究院 | A kind of direct current quad for high current transmission of electricity |
-
2020
- 2020-04-26 CN CN202010337572.4A patent/CN111489860A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2909217A1 (en) * | 2006-11-29 | 2008-05-30 | Commissariat Energie Atomique | High electro-magnetic immunity electric cable for transmitting impulse signal, has two protection layers for protecting mineral dielectric layer, where layers are arranged on conducting central core |
| CN204066798U (en) * | 2014-06-03 | 2014-12-31 | 淮南新光神光纤线缆有限公司 | A kind of light-duty high anti-nuclear electromagnetic pulse composite cable |
| CN104240836A (en) * | 2014-09-02 | 2014-12-24 | 淮南新光神光纤线缆有限公司 | Super-soft nuclear-resistant electromagnetic pulse control cable |
| CN105047298A (en) * | 2015-06-12 | 2015-11-11 | 南京全信传输科技股份有限公司 | 1553B bus cable for astronavigation |
| CN209249191U (en) * | 2018-12-03 | 2019-08-13 | 核工业西南物理研究院 | A kind of direct current quad for high current transmission of electricity |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024017243A1 (en) * | 2022-07-22 | 2024-01-25 | 前微科技(上海)有限公司 | Cable and electrical device using said cable |
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Application publication date: 20200804 |