CN113793729A - Medium-voltage feeder cable and preparation method and application thereof - Google Patents
Medium-voltage feeder cable and preparation method and application thereof Download PDFInfo
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- H—ELECTRICITY
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- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/06—Insulating conductors or cables
- H01B13/14—Insulating conductors or cables by extrusion
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
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- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/04—Flexible cables, conductors, or cords, e.g. trailing cables
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- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
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- H01B9/00—Power cables
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- 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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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Insulated Conductors (AREA)
Abstract
The invention provides a medium-voltage feed cable and a preparation method and application thereof, wherein the medium-voltage feed cable comprises a metal wire core, and a conductor shielding layer, an insulating shielding layer, a copper wire shielding layer and an outer sheath are sequentially coated outside the metal wire core; the insulating layer is made of an ethylene propylene rubber composition, and the thickness of the insulating layer is 3.44-4.2 mm; through the hierarchical structure design, the selection of the insulating layer material and the setting of the thickness, the obtained medium-voltage feed cable can simultaneously meet the voltage withstanding of 35kV, the voltage drop of 5V/m and the temperature rise of no more than 100K/10s, and the requirements of a high-speed magnetic suspension system on the cable are completely met.
Description
Technical Field
The invention belongs to the technical field of cables, and particularly relates to a medium-voltage feeder cable and a preparation method and application thereof.
Background
The high-speed railway magnetic levitation system has the advantages of non-contact operation, high speed, quick start, low energy consumption, small environmental influence and the like, and the magnetic levitation traffic is a novel traffic tool, is a high-tech traffic tool utilizing attractive force and repulsive force between magnetic poles, and mainly realizes the functions of supporting, guiding, traction and braking in the traditional railway by means of electromagnetic force. The electromagnetic force generates a strong electromagnetic field, which generates strong electromagnetic interference to the surrounding environment.
The special magnetic suspension cable is a special flexible medium-voltage cable designed and manufactured for a magnetic suspension system, the rated voltage of the special magnetic suspension cable is 10/17.5(20) kV, and the frequency range of the special magnetic suspension cable is 0-50 Hz. Because the cable is operated in a frequency conversion strong magnetic field and is usually laid along two side tracks outdoors, the cable not only has extremely high flexibility requirement, but also has the characteristics of weather resistance, corrosion resistance, flame retardance and self-lubrication, thereby providing high requirements on the mechanical and electrical and environmental resistance of the structure, insulation and sheath materials of the cable.
CN205564319U discloses a power cable for synchronously towing a smart energy maglev train, which sequentially comprises a conductor, a semiconductive nylon belt, a semiconductive conductor shielding layer, an ethylene propylene rubber insulating layer, a semiconductive insulating shielding layer, a semiconductive sheath and a graphene coating layer from inside to outside; the conductor adopts three-layer soft aluminum conductors, and is respectively a round single-wire stranded conductor, a tile-shaped single-wire stranded conductor and a Z-shaped single-wire stranded conductor from inside to outside. The cable adopts the semi-conductive sheath and the high-conductivity high-modulus graphene coating layer to replace a metal shield adopted by the traditional medium-voltage cable, so that induction current generated in the power transmission process can be guided into the ground, and the defect of overlarge cable hardness caused by the metal shield is overcome. The flame-retardant plastic also has the excellent characteristics of small bending radius, high conductivity, high flame retardance, high chemical stability, self-lubrication and the like.
CN112582100A discloses a production process of a feeder cable for a maglev train, the cable sequentially comprises a core conductor, a conductor shielding layer, an insulating shielding layer, a metal shielding layer and an outer sheath from inside to outside, and the metal shielding layer is a copper wire shielding layer; a first water-blocking tape is wrapped outside the insulating shielding layer, the metal shielding layer consists of a metal wire shielding layer and a metal belt shielding layer, the metal belt shielding layer is arranged on the outer layer, a second water-blocking tape is wrapped outside the metal belt shielding layer, and a polyethylene outer sheath is extruded outside the second water-blocking tape; the core conductor is a composite conductor formed by stranding a plurality of copper wires; and water-blocking powder is filled between the conductor shielding layer and the core conductor. On the premise of ensuring the most basic operation and use requirements of the prepared cable, the large-section copper wire shielding design can reduce the risk of the magnetic suspension feed power grid paralysis of the cable caused by overcurrent due to faults, and prolong the service life of the cable under severe conditions.
CN110459353A discloses a long stator cable dedicated for magnetic suspension. The cable comprises a conductor, wherein a conductor shielding layer, an insulating shielding layer, a sheath and a coating are sequentially extruded outside the conductor; the resistivity of the insulating shielding layer is greater than that of the sheath, and the resistivity of the sheath is greater than that of the coating; the conductor comprises a center line positioned at the center position, and a plurality of annular conductor layers arranged from inside to outside are arranged on the outer circumference of the center line. The cable obtained by the invention has high conductor compactness and small laying bending radius; in addition, the induced current, the capacitance current and the leakage current of the long stator cable can be effectively reduced, and the safety is improved.
However, the conventional medium voltage cables provided in the prior art including the above patents have voltages to earth of 8.7kV or 12kV and withstand voltages of 30.5kV or 42kV, respectively, but neither of the two types of cables can simultaneously satisfy the requirements of withstand voltage of 35kV, voltage drop of 5V/m, temperature rise of not more than 100K/10s, and cable outer diameter of not more than 42mm, and the effect of applying the cable to a high-speed magnetic suspension system is not ideal.
Therefore, the development of a cable which can simultaneously realize 35kV voltage resistance, 5V/m voltage drop, no more than 100K/10s temperature rise and no more than 42mm of outer diameter of the cable is a technical problem which needs to be solved urgently in the field.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a medium-voltage feed cable and a preparation method and application thereof, wherein the medium-voltage feed cable comprises a metal wire core, and a conductor shielding layer, an insulating shielding layer, a copper wire shielding layer and an outer sheath are sequentially coated outside the metal wire core; the insulating layer is made of an ethylene propylene rubber composition, and the thickness of the insulating layer is 3.44-4.2 mm; through the hierarchical structure design, the selection of the insulating layer material and the setting of the thickness, the obtained medium-voltage feed cable can simultaneously meet the voltage withstanding of 35kV, the voltage drop of 5V/m and the temperature rise of no more than 100K/10s, and the requirement of high-speed magnetic suspension on the cable is met.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides a medium-voltage feed cable, which comprises a metal core, wherein a conductor shielding layer, an insulating shielding layer, a copper wire shielding layer and an outer sheath are sequentially coated outside the metal core;
the material of the insulating layer is an ethylene propylene rubber composition, the thickness of the insulating layer is 3.44-4.2 mm, such as 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4mm, 4.1mm or 4.15mm, and the specific values therebetween are limited by space and for the sake of brevity, and the invention is not exhaustive of the specific values included in the range.
The medium voltage feed cable in the medium voltage feed cable provided by the invention refers to a cable with a rated power supply voltage of 10 kV.
The cross-sectional structure schematic diagram of the medium-voltage feeder cable provided by the invention is shown in fig. 1, wherein 1 represents a metal core; 2, a conductor shielding layer is coated outside the metal wire core, so that the non-roundness of the surface of the metal wire core can be neutralized, and the effect of balancing an electric field is achieved; the insulating layer 3 is made of an ethylene propylene rubber composition, the thickness of the insulating layer 3 is 3.44-4.2 mm, the obtained cable can meet the requirements of 35kV voltage resistance, 5V/m voltage drop and no more than 100K/10s temperature rise, and the cable can still maintain stable performance under high-power medium-frequency pulses; 4 represents an insulating shielding layer which also has the function of balancing an external electric field; 5 represents a copper wire shielding layer, and the copper wire shielding layer 5 is coated outside the insulating shielding layer, so that the cable can bear the charging current of 18.7A/km; and 6 represents an outer sheath, which has better mechanical property and can protect the cable from external damage.
According to the medium-voltage feed cable provided by the invention, through the design of the hierarchical structure, the thickness of the matched insulating layer which takes the ethylene propylene rubber composition as the insulating layer material is 3.44-4.2 mm, so that the obtained medium-voltage feed cable has ultraviolet-proof, low-smoke, halogen-free and flame-retardant properties, can be laid indoors or outdoors, underground, cable bridges, cable ditches and other positions, and can meet the requirements of voltage drop, temperature rise and high-power medium-frequency pulse load; on one hand, if the thickness of the insulating layer is too low, the withstand voltage of the obtained cable cannot reach 35kV, namely the cable is easy to break down under the withstand voltage of 35kV/5 min; on the other hand, if the thickness of the insulating layer is too high, the inductance value of the cable increases under the medium-frequency pulse, and the voltage drop exceeds 5V/m; and if the ethylene propylene rubber composition is not selected to match with the thickness of 3.44-4.2 mm, the temperature rise of the obtained cable is too high, and the requirement of a high-speed magnetic suspension system on the cable cannot be met finally.
Preferably, the diameter of the metal wire core is 23-24 mm, such as 23.1mm, 23.2mm, 23.3mm, 23.4mm, 23.5mm, 23.6mm, 23.7mm, 23.8mm or 23.9mm, and the specific values therebetween are not exhaustive for the sake of brevity and simplicity.
Preferably, the metal wire core comprises a plurality of 5 th tinned copper wires stranded together.
Preferably, the thickness of the conductor shielding layer is 0.3-0.5 mm, such as 0.32mm, 0.34mm, 0.36mm, 0.38mm, 0.4mm, 0.42mm, 0.44mm, 0.46mm or 0.48mm, and specific values therebetween, which are not exhaustive for the sake of brevity and simplicity.
Preferably, the material of the conductor shielding layer comprises a semiconductor extrusion material or a semiconductor electric wrapping tape.
Preferably, the ethylene-propylene rubber composition comprises the following components in parts by weight: 40-60 parts of ethylene propylene diene monomer, 8-12 parts of low-density polyethylene resin, 40-60 parts of modified calcined kaolin, 2-3 parts of zinc oxide, 3-4 parts of microcrystalline wax, 0.8-1.2 parts of titanium dioxide and 3-5 parts of paraffin oil.
The ethylene propylene diene monomer may be 42 parts by weight, 44 parts by weight, 46 parts by weight, 48 parts by weight, 50 parts by weight, 52 parts by weight, 54 parts by weight, 56 parts by weight, 58 parts by weight or the like.
The low density polyethylene resin may be 8.5 parts by weight, 9 parts by weight, 9.5 parts by weight, 10 parts by weight, 10.5 parts by weight, 11 parts by weight, 11.5 parts by weight, or the like.
The modified calcined kaolin can be 42, 44, 46, 48, 50, 52, 54, 56, or 58 parts by weight, or the like.
The zinc oxide may be 2.1 parts by weight, 2.2 parts by weight, 2.3 parts by weight, 2.4 parts by weight, 2.5 parts by weight, 2.6 parts by weight, 2.7 parts by weight, 2.8 parts by weight, 2.9 parts by weight, or the like.
The microcrystalline wax may be 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, or 3.9 parts by weight, or the like.
The titanium dioxide may be present in an amount of 0.85, 0.9, 0.95, 1, 1.05, 1.1, or 1.15 parts by weight.
The paraffin oil may be 3.2 parts by weight, 3.4 parts by weight, 3.6 parts by weight, 3.8 parts by weight, 4 parts by weight, 4.2 parts by weight, 4.4 parts by weight, 4.6 parts by weight, 4.8 parts by weight, or the like.
The ethylene-propylene rubber composition also comprises any one or the combination of at least two of an anti-aging agent, an anti-aging synergist, a coupling agent, a crosslinking agent and a crosslinking assistant.
Preferably, the ethylene-propylene rubber composition contains 0.3 to 0.7 parts by weight of an antioxidant, for example, 0.33 parts by weight, 0.36 parts by weight, 0.39 parts by weight, 0.45 parts by weight, 0.5 parts by weight, 0.55 parts by weight, 0.6 parts by weight, or 0.65 parts by weight.
Preferably, the content of the anti-aging synergist in the ethylene propylene rubber composition is 0.3 to 0.7 parts by weight, such as 0.33 part by weight, 0.36 part by weight, 0.39 part by weight, 0.45 part by weight, 0.5 part by weight, 0.55 part by weight, 0.6 part by weight or 0.65 part by weight.
Preferably, the coupling agent is contained in the ethylene-propylene rubber composition in an amount of 0.3 to 0.7 parts by weight, for example, 0.33 parts by weight, 0.36 parts by weight, 0.39 parts by weight, 0.45 parts by weight, 0.5 parts by weight, 0.55 parts by weight, 0.6 parts by weight, or 0.65 parts by weight.
Preferably, the content of the crosslinking agent in the ethylene-propylene rubber composition is 1 to 3 parts by weight, such as 1.2 parts by weight, 1.4 parts by weight, 1.6 parts by weight, 1.8 parts by weight, 2 parts by weight, 2.2 parts by weight, 2.4 parts by weight, 2.6 parts by weight, 2.8 parts by weight, or the like.
Preferably, the content of the crosslinking assistant in the ethylene-propylene rubber composition is 0.3 to 0.7 parts by weight, such as 0.33 parts by weight, 0.36 parts by weight, 0.39 parts by weight, 0.45 parts by weight, 0.5 parts by weight, 0.55 parts by weight, 0.6 parts by weight, or 0.65 parts by weight.
According to a preferable technical scheme, the ethylene propylene rubber composition comprises, by weight, 40-60 parts of ethylene propylene diene monomer, 8-12 parts of low-density polyethylene resin, 40-60 parts of modified calcined kaolin, 2-3 parts of zinc oxide, 3-4 parts of microcrystalline wax, 0.8-1.2 parts of titanium dioxide, 3-5 parts of paraffin oil, 0.3-0.7 part of anti-aging agent, 0.3-0.7 part of anti-aging synergist, 0.3-0.7 part of coupling agent, 1-3 parts of cross-linking agent and 0.3-0.7 part of cross-linking assistant, and a specific formula is selected, a specific additive is selected, an optimal proportion is determined, and the ethylene propylene rubber composition with high purity and high pressure resistance grade is prepared and is more suitable for being used as a material of a cable insulating layer.
Preferably, the thickness of the insulation shield layer is 0.3-0.5 mm, such as 0.32mm, 0.34mm, 0.36mm, 0.38mm, 0.4mm, 0.42mm, 0.44mm, 0.46mm or 0.48mm, and specific points therebetween, and the invention is not exhaustive and for simplicity.
Preferably, the material of the insulation shielding layer is a semiconductor material.
Preferably, the semiconductor material comprises a semiconductor extrusion material or a semiconductor electrical tape.
Preferably, the material of the copper wire shielding layer is tinned copper wire.
Preferably, the monofilament diameter of the tin-plated copper wire is 0.2-0.25 mm, such as 0.205mm, 0.21mm, 0.215mm, 0.22mm, 0.225mm, 0.23mm, 0.235mm, 0.24mm or 0.245mm, and the specific values therebetween are not exhaustive, and for the sake of brevity and clarity, the invention is not intended to be exhaustive.
Preferably, the outer jacket is a low smoke zero halogen elastomer jacket.
Preferably, the outer sheath has a thickness of 1.8 to 2.2mm, such as 1.85mm, 1.9mm, 1.95mm, 2mm, 2.05mm, 2.1mm, 2.15mm or 2.2mm, and the specific values therebetween are not exhaustive for the sake of brevity and clarity.
In a second aspect, the present invention provides a method of manufacturing a medium voltage feeder cable according to the first aspect, the method comprising the steps of:
(1) sequentially extruding the materials of the conductor shielding layer, the insulating layer and the insulating shielding layer on the outer surface of the metal wire core to obtain a composite layer;
(2) and weaving the material of the copper wire shielding layer on the outer surface of the composite layer, and connecting the composite layer with a sheath to obtain the medium-voltage feed cable.
Preferably, the extrusion of step (1) is a three-layer coextrusion.
In a third aspect, the present invention provides a use of a medium voltage feeder cable as described in the first aspect in high speed magnetic levitation.
Compared with the prior art, the invention has the following beneficial effects:
(1) the medium-voltage feed cable provided by the invention comprises a metal wire core, wherein a conductor shielding layer, an insulating shielding layer, a copper wire shielding layer and an outer sheath are sequentially coated outside the metal wire core; the material of the insulating layer is selected to comprise the ethylene propylene rubber composition, and the thickness of the insulating layer is set to be 3.44-4.2 mm, so that the obtained medium-voltage feeder cable can meet the requirements of withstand voltage of 35kV, voltage drop of 5V/m and temperature rise of no more than 100K/10s at the same time; when the medium-voltage feed cable provided by the invention is applied to a high-speed magnetic suspension system, the voltage to ground of a single cable is 10kV, the line voltage is 17.3kV, the maximum running current of the system is 5kA, the working frequency is 0-500 Hz, the voltage drop per meter of the single cable is less than 5V under the condition that 5kA/500Hz alternating current flows, and after 5kA/500Hz alternating current flows for 10s continuously; the temperature rise of a single cable is not more than 100K, the repeated use after 2 hours is not influenced, the bending radius of the single cable is not more than 6 times of the outer diameter of the cable, and the requirement of high-speed magnetic suspension on the cable is met.
Drawings
Fig. 1 is a schematic cross-sectional structure view of a medium voltage feeder cable provided by the present invention;
the cable comprises a metal wire core 1, a conductor shielding layer 2, an insulating layer 3, an insulating shielding layer 4, a copper wire shielding layer 5 and an outer sheath 6.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
Preparation example 1
The ethylene-propylene rubber composition comprises the following components in parts by weight: 50 parts of ethylene propylene diene monomer (Korea Jinhu, KEP510), 10 parts of low-density polyethylene resin (China petrochemicals, 7042), 50 parts of modified calcined kaolin, 2.5 parts of zinc oxide, 3.5 parts of microcrystalline wax, 1 part of titanium dioxide, 0.5 part of stearic acid (Suzhou Tibetan book, 1801), 0.5 part of anti-aging agent RD, 0.5 part of anti-aging synergist MB, 4 parts of paraffin oil (Hansheng, 2280), 0.78 part of coupling agent A-1720.5, 2 parts of crosslinking agent DCP and 0.5 part of crosslinking assistant TAIC;
the ethylene-propylene rubber composition obtained in the preparation example is obtained by uniformly mixing the components.
Example 1
A schematic diagram of a cross-sectional structure of a medium-voltage feeder cable is shown in figure 1, and the medium-voltage feeder cable comprises a metal wire core 1, wherein a conductor shielding layer 2, an insulating layer 3, an insulating shielding layer 4, a copper wire shielding layer 5 and an outer sheath 6 are sequentially coated outside the metal wire core;
the diameter of the metal wire core 1 is 23.5mm, and the metal wire core is formed by stranding a plurality of 5 kinds of tinned copper wires;
the thickness of the conductor shielding layer 2 is 0.3mm, and the material is (peroxide crosslinking type semiconductor material for the electric conduction of ethylene propylene rubber insulated cables, PEJD);
the thickness of the insulating layer 3 is 4mm, and the material is the ethylene propylene diene monomer rubber composition obtained in preparation example 1;
the thickness of the insulation shielding layer 4 is 0.5mm, and the material is (peroxide crosslinking type semiconductor material for ethylene propylene rubber insulation cable, PEJJ);
the monofilament diameter of the copper wire shielding layer 5 is 0.20mm, and the material is a tinned copper wire;
the thickness of the outer sheath 6 is 2.2mm, and the material is low smoke halogen-free elastomer (muffle, LSOH-90);
the preparation method of the medium-voltage feeder cable provided by the embodiment comprises the following steps:
(1) sequentially extruding the materials of the conductor shielding layer, the ethylene propylene diene monomer composition and the insulation shielding layer on the outer surface of the metal wire core to obtain a composite layer;
(2) and weaving a tinned copper wire on the outer surface of the composite layer, and connecting the composite layer with a sheath to obtain the medium-voltage feed cable.
Example 2
A medium voltage feeder cable having the same sectional structure as in embodiment 1;
the method comprises the following steps: the metal wire core is 23mm in diameter and formed by stranding a plurality of 5 kinds of tinned copper wires;
a conductor shield layer with a thickness of 0.5mm and made of (semi-conductive extrusion material);
an insulating layer with the thickness of 3.44mm, wherein the material is the ethylene propylene diene monomer composition obtained in the preparation example 1;
an insulating shielding layer with the thickness of 0.5mm and made of (semi-conductive extrusion material);
the diameter of each single wire is 0.25mm, and the single wire is made of a tinned copper wire;
the outer sheath is 2.2mm in thickness and made of a low-smoke halogen-free elastomer;
the preparation method of the medium-voltage feeder cable provided by the embodiment comprises the following steps:
(1) sequentially extruding the materials of the conductor shielding layer, the ethylene propylene diene monomer composition and the insulation shielding layer on the outer surface of the metal wire core to obtain a composite layer;
(2) and weaving a tinned copper wire on the outer surface of the composite layer, and connecting the composite layer with a sheath to obtain the medium-voltage feed cable.
Example 3
A medium voltage feeder cable having the same sectional structure as in embodiment 1;
the method comprises the following steps: the metal wire core is 24mm in diameter and formed by stranding a plurality of 5 kinds of tinned copper wires;
a conductor shield layer with a thickness of 0.5mm and made of (semi-conductive extrusion material);
an insulating layer with the thickness of 4.2mm, wherein the material is the ethylene propylene diene monomer composition obtained in the preparation example 1;
an insulating shielding layer with the thickness of 0.5mm and made of (semi-conductive extrusion material);
the copper wire shielding layer is 0.25mm in thickness and made of tinned copper wire;
the outer sheath is 2.0mm thick and made of low-smoke halogen-free elastomer;
the preparation method of the medium-voltage feeder cable provided by the embodiment comprises the following steps:
(1) sequentially extruding the materials of the conductor shielding layer, the ethylene propylene diene monomer composition and the insulation shielding layer on the outer surface of the metal wire core to obtain a composite layer;
(2) and weaving a tinned copper wire on the outer surface of the composite layer, and connecting the composite layer with a sheath to obtain the medium-voltage feed cable.
Example 4
A medium voltage feeder cable differing from example 1 only in that the thickness of the insulating layer was 3.44mm, and the other structures, parameters and manufacturing methods were the same as example 1.
Example 5
A medium voltage feeder cable differing from example 1 only in that the thickness of the insulating layer was 4.2mm, and the other structures, parameters and manufacturing methods were the same as example 1.
Comparative example 1
A medium voltage feeder cable differing from example 1 only in that the thickness of the insulating layer was 3mm, and the other structures, parameters and preparation methods were the same as example 1.
Comparative example 2
A medium voltage feeder cable differing from example 1 only in that the thickness of the insulating layer was 4.3mm, and the other structures, parameters and manufacturing methods were the same as example 1.
Comparative example 3
A medium voltage feeder cable differs from example 1 in that the conductor shield layer is a wrapped semi-conductive tape, the insulation layer is a silicone rubber material, the insulation shield layer is a wrapped semi-conductive tape, and other structures, parameters and preparation methods are the same as those of example 1.
And (3) performance testing:
(1) pressure resistance: testing according to a testing method provided by GB/T3048.8;
(2) pressure drop: connecting a tested cable to a three-phase variable-frequency adjustable alternating current power supply in a three-phase star connection mode, adjusting the output current of the three-phase variable-frequency adjustable alternating current power supply to be I, the output voltage to be U, the testing length of the cable to be L, and calculating according to the delta U (voltage drop) to be Z multiplied by 5000 multiplied by 1.25 (note: 1.25 is a conversion coefficient converted from 400Hz to 500 Hz);
(3) temperature rise: connecting a tested cable to a frequency conversion alternating current power supply loop accompanied with a test through a switch, adjusting the output current of a frequency conversion alternating current power supply, continuously electrifying the tested cable, recording the temperature of a key part of a cable conductor, recording the time when the temperature rises by 10K every time, and simultaneously recording the time when the corresponding temperature is reached until the temperature of an inner conductor of the cable rises to 100K or the temperature stops rising to finish the test;
(4) the flame retardance was tested according to the test method provided in GB/T12706.2.
The medium voltage feeder cables provided in examples 1 to 5 and comparative examples 1 to 3 were tested according to the above test method, and the test results are shown in table 1:
TABLE 1
As can be seen from the data in table 1:
the medium-voltage feed cables provided by the embodiments 1 to 5 can withstand voltage of 39 to 55kV/5min, have a voltage drop of 4.2 to 4.9V/m and a temperature rise of 37 to 42K, and are ZC in flame retardant tests.
Comparing the embodiment 1 with the comparative examples 1-2, it can be seen that the cable obtained in the comparative example 1 has the final withstand voltage of only 30kV/5min due to the excessively low thickness of the insulating layer, so that the requirements are not met, and the subsequent test cannot be carried out; the cable obtained in comparative example 2 also does not meet the requirements because the thickness of the insulating layer is too high, resulting in a pressure drop of up to 5.3V/m.
Further comparison of example 1 and comparative example 3 shows that the withstand voltage of the cable obtained by using the silicone rubber as the main material of the insulating layer in the prior art does not meet the standard.
The applicant states that the present invention illustrates a medium voltage feeder cable and a method for making and using the same by the above embodiments, but the present invention is not limited to the above process steps, i.e. it does not mean that the present invention must rely on the above process steps to be carried out. It will be apparent to those skilled in the art that any modification of the present invention, equivalent substitutions of selected materials and additions of auxiliary components, selection of specific modes and the like, which are within the scope and disclosure of the present invention, are contemplated by the present invention.
Claims (10)
1. The medium-voltage feed cable is characterized by comprising a metal wire core, wherein a conductor shielding layer, an insulating shielding layer, a copper wire shielding layer and an outer sheath are sequentially coated outside the metal wire core;
the insulating layer is made of an ethylene propylene rubber composition, and the thickness of the insulating layer is 3.44-4.2 mm.
2. The medium voltage feeder cable according to claim 1, wherein the metal core has a diameter of 23-24 mm;
preferably, the metal wire core comprises a plurality of 5 th tinned copper wires stranded together.
3. The medium voltage feeder cable according to claim 1 or 2, wherein the conductor shield has a thickness of 0.3 to 0.5 mm;
preferably, the material of the conductor shield layer comprises a semiconductor material.
4. The medium voltage feeder cable according to any one of claims 1 to 3, wherein the ethylene propylene rubber composition comprises the following components in parts by weight: 40-60 parts of ethylene propylene diene monomer, 8-12 parts of low-density polyethylene resin, 40-60 parts of modified calcined kaolin, 2-3 parts of zinc oxide, 3-4 parts of microcrystalline wax, 0.8-1.2 parts of titanium dioxide and 3-5 parts of paraffin oil;
the ethylene propylene rubber composition also comprises any one or the combination of at least two of an anti-aging agent, an anti-aging synergist, a coupling agent, a crosslinking agent or a crosslinking assistant;
preferably, the content of the anti-aging agent in the ethylene propylene rubber composition is 0.3-0.7 part by weight;
preferably, the content of the anti-aging synergist in the ethylene propylene rubber composition is 0.3-0.7 part by weight;
preferably, the content of the coupling agent in the ethylene propylene rubber composition is 0.3-0.7 part by weight;
preferably, the content of the cross-linking agent in the ethylene propylene rubber composition is 1-3 parts by weight;
preferably, the content of the crosslinking assistant in the ethylene propylene rubber composition is 0.3-0.7 part by weight.
5. The medium voltage feeder cable according to any one of claims 1 to 4, wherein the insulating shield layer has a thickness of 0.3 to 0.5 mm;
preferably, the material of the insulation shielding layer is a semiconductor material.
6. The medium voltage feeder cable according to any one of claims 1 to 5, wherein the material of the copper wire shielding layer is tinned copper wire;
preferably, the diameter of each single wire of the tinned copper wire is 0.2-0.25 mm.
7. The medium voltage feeder cable according to any one of claims 1 to 6, wherein the outer jacket is a low smoke zero halogen elastomer jacket;
preferably, the thickness of the outer sheath is 1.8-2.2 mm.
8. A method for preparing a medium voltage feeder cable according to any one of claims 1 to 7, wherein the method comprises the following steps:
(1) sequentially extruding the materials of the conductor shielding layer, the insulating layer and the insulating shielding layer on the outer surface of the metal wire core to obtain a composite layer;
(2) and weaving the material of the copper wire shielding layer on the outer surface of the composite layer, and connecting the composite layer with a sheath to obtain the medium-voltage feed cable.
9. The method of claim 8, wherein the extruding of step (1) is a three-layer coextrusion.
10. Use of a medium voltage feeder cable according to any one of claims 1 to 7 in high speed magnetic levitation.
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| CN202111059089.5A CN113793729A (en) | 2021-09-09 | 2021-09-09 | Medium-voltage feeder cable and preparation method and application thereof |
| PCT/CN2021/139908 WO2023035487A1 (en) | 2021-09-09 | 2021-12-21 | Medium-voltage feeder cable, preparation method therefor and application thereof |
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| CN202111059089.5A CN113793729A (en) | 2021-09-09 | 2021-09-09 | Medium-voltage feeder cable and preparation method and application thereof |
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| WO2023035487A1 (en) * | 2021-09-09 | 2023-03-16 | 江苏亨通电力电缆有限公司 | Medium-voltage feeder cable, preparation method therefor and application thereof |
| CN116478481A (en) * | 2023-04-23 | 2023-07-25 | 国网湖南省电力有限公司 | Ethylene propylene rubber insulating material regulated and controlled by low-density polyethylene, and preparation method and application thereof |
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| WO2023035487A1 (en) | 2023-03-16 |
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Application publication date: 20211214 |