CN114974719B - Medium-voltage flame-retardant power cable and manufacturing method thereof - Google Patents
Medium-voltage flame-retardant power cable and manufacturing method thereof Download PDFInfo
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- CN114974719B CN114974719B CN202210921350.6A CN202210921350A CN114974719B CN 114974719 B CN114974719 B CN 114974719B CN 202210921350 A CN202210921350 A CN 202210921350A CN 114974719 B CN114974719 B CN 114974719B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B9/00—Power cables
- H01B9/02—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients
- H01B9/021—Features relating to screening tape per se
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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
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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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/29—Protection against damage caused by extremes of temperature or by flame
- H01B7/295—Protection against damage caused by extremes of temperature or by flame using material resistant to flame
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/42—Insulated conductors or cables characterised by their form with arrangements for heat dissipation or conduction
- H01B7/421—Insulated conductors or cables characterised by their form with arrangements for heat dissipation or conduction for heat dissipation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/42—Insulated conductors or cables characterised by their form with arrangements for heat dissipation or conduction
- H01B7/428—Heat conduction
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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
- H01B9/005—Power cables including optical transmission elements
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/14—Extreme weather resilient electric power supply systems, e.g. strengthening power lines or underground power cables
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Abstract
The invention discloses a medium-voltage flame-retardant power cable and a manufacturing method thereof, wherein the medium-voltage flame-retardant power cable comprises a cable core, and a belting layer, a heat insulation layer, an outer shielding layer and an outer protective layer which are sequentially coated from inside to outside; the cable core consists of a conductive wire core, an insulating layer and an inner shielding layer; a filling layer is arranged between the cable core and the belting layer, and signal wires are placed in the filling layer; the inner shielding layer or/and the outer shielding layer are/is provided with a containing ball head cavity. According to the invention, through the design of the ball head accommodating cavity, the ball head accommodating cavity and the through holes thereof, heat and radiated electromagnetic waves can be reflected and consumed for multiple times in the porous cavity channel, so that the absorption loss of the heat and the electromagnetic waves is increased, the radiation range is reduced, and meanwhile, the interference on a signal line is weakened; through the multi-layer structure design, the electromagnetic radiation is reduced, and the high temperature resistance is improved; through the double-layer shielding of the inner shielding layer and the outer shielding layer, the superposition effect of a magnetic field is reduced, and the radiation resistance of the cable is improved.
Description
Technical Field
The invention belongs to the technical field of cables, and particularly relates to a medium-voltage flame-retardant power cable and a manufacturing method thereof.
Background
The electric wire and cable for the nuclear power station comprise a power cable, a measuring cable, a communication cable, an instrument cable, a fireproof cable and the like, and the magnetic field of the cable and the magnetic field of the nuclear power station in the prior art form a higher magnetic field environment, so that the problems of interference on signals inside the cable, interference and radiation on the external environment and poor stability are caused.
Disclosure of Invention
The invention aims to solve the problems and provides a medium-voltage flame-retardant power cable and a manufacturing method thereof, and in order to solve the technical problems, the invention is realized by the following technical scheme:
a medium-voltage flame-retardant power cable comprises a cable core, and a belting layer, a heat insulation layer, an outer shielding layer and an outer protective layer which are sequentially coated from inside to outside; the cable core consists of a conductive wire core, an insulating layer and an inner shielding layer; a filling layer is arranged between the cable core and the belting layer, and signal wires are placed in the filling layer; the inner shielding layer is provided with a ball head accommodating part or/and a ball head accommodating cavity, the ball head part of the ball head accommodating part is provided with a through hole, or both sides of the ball head accommodating part are provided with through holes, or both the ball head part of the ball head accommodating part and both sides of the ball head accommodating part are provided with through holes, and the through holes can form a channel inside and have the functions of conducting and absorbing heat; the outer shielding layer is also provided with a ball head accommodating cavity or/and a ball head accommodating cavity; the inner shielding layer and the outer shielding layer are both provided with ball heads or/and ball head accommodating cavities; the cavity for accommodating the ball head is internally provided with a cavity gap with a hollow hole, the size of the cavity gap can be adjusted according to the strength of a magnetic field and the thickness of a wrapping bag, so that the shape of the ball head is selected, the transmission and reflection of electromagnetic waves are mainly considered, and the consumption and the absorption of magnetic force are facilitated.
Furthermore, the ball head part for accommodating the ball head cavity is provided with a through hole, or through holes are arranged on two sides of the ball head cavity in a penetrating manner, of course, through holes can also be arranged on the head part for accommodating the ball head cavity and two sides of the ball head cavity in a penetrating manner; the through holes can be multiple, different through holes need to be formed in the wrapping process according to the size of peripheral heat and the strength of a magnetic field, the ball head portion needs to be provided with the through holes sometimes, and the two sides of the ball head cavity need to be provided with the through holes sometimes.
Further, the accommodating ball heads or/and the accommodating ball head cavities are arranged or arranged in a staggered mode; in order to better consume and absorb heat and electromagnetic waves, the accommodating ball head or/and the accommodating ball head cavity are arranged in a staggered mode to form a honeycomb-shaped three-dimensional structure space, and consumption and absorption of the heat and the electromagnetic waves are facilitated.
Furthermore, shielding liquid is coated inside and outside the ball head containing the ball head or the ball head containing cavity, the shielding liquid can be sprayed or soaked, and a shielding film is formed after the shielding liquid is dried. The shielding films coated inside and outside the accommodating ball head and the ball head or the accommodating ball head cavity can be understood as the periphery of the whole ball head or the periphery of the whole ball head cavity, and can also be understood as the shielding films coated on the whole inner shielding layer and the whole outer shielding layer.
Further, the shielding liquid mainly comprises the following components in parts by weight: 5-15 parts of reticular conductive filler, 5-15 parts of fibrous conductive filler, 10-20 parts of epoxy resin, 10-20 parts of diepoxy silane, 20-40 parts of high-temperature resistant film-forming resin, 2-5 parts of silver-plated copper powder, 2-5 parts of silicon carbide powder, 0.5-2 parts of electromagnetic shielding filler dispersing agent, 1-2 parts of flatting agent, 1-3 parts of curing agent and 30-50 parts of organic solvent. The shielding film can reduce radiation of a magnetic field, and the existing known shielding film can also play a role in shielding radiation, but the shielding film without the improvement of the invention has good effect.
A preparation method of a medium-voltage flame-retardant power cable comprises the following steps:
s1, cable core manufacturing: wrapping the insulating layer outside the conductive wire core in an extruding manner, and wrapping the inner shielding layer on the insulating layer to obtain a cable core;
s2, binding a belting layer: the cable cores are screwed together and filled with inorganic paper filling ropes, the signal wires are inserted into the inorganic paper filling ropes and are arranged in a phase manner, and the inorganic paper filling layers are wrapped by wrapping tape layers and are fastened tightly;
s3, extruding the heat insulation layer to the periphery of the product prepared in the step S2 in an extruding and wrapping mode;
s4, wrapping the outer shielding layer to the periphery of the product prepared in the S3 in a wrapping mode;
s5, extruding and wrapping an outer protective layer: extruding an outer protective layer on the surface of the product prepared in the step S4 to prepare a cable;
the preparation steps of the inner shielding layer in the step S1 and/or the outer shielding layer in the step S4 are as follows: and a plurality of ball heads or/and ball head accommodating cavities are formed on one or two surfaces of the inner shielding layer or/and the outer shielding layer, through holes are formed in the ball heads or/and the ball head accommodating cavities, and then the inner shielding layer or/and the outer shielding layer are wrapped.
Furthermore, before the inner or outer shielding layer is wrapped, the ball head or/and the ball head cavity and the through hole thereof are subjected to shielding liquid spraying or shielding liquid soaking, a shielding film is formed after drying, and then the wrapping is carried out.
Further, when the accommodating ball head or/and the accommodating ball head cavity of the inner shielding layer are manufactured, the diameters of the accommodating ball head or/and the accommodating ball head cavity are manufactured step by step from large to small. Therefore, the shielding layer is manufactured according to different diameters, three-dimensional net-shaped space is formed when the shielding layer is wrapped, heat consumption is enlarged, and magnetic radiation is weakened, namely, the distance away from the conductive wire core is gradually increased, the diameter of a ball head accommodating or/and a ball head accommodating cavity of an inner shielding layer which is adjacent to the conductive wire core is the smallest, the diameter of the ball head accommodating or/and the ball head accommodating cavity of the inner shielding layer which is adjacent to the intermediate layer is larger, the diameter of the ball head accommodating or/and the ball head accommodating cavity of the inner shielding layer which is outermost wrapped is the largest, in summary, the diameters of the ball head accommodating or/and the ball head accommodating cavity of the inner shielding layer which is different in the wrapping of different layers are different, and therefore heat can be greatly absorbed and electromagnetic wave attenuation can be greatly enhanced. The receiving ball head and its ball head or the receiving ball head cavity and its cavity opening can be understood as the diameter of the whole ball head or the diameter of the whole ball head cavity.
Further, when the accommodating ball head or/and the accommodating ball head cavity of the outer shielding layer are manufactured, the diameters of the accommodating ball head or/and the accommodating ball head cavity are manufactured step by step from small to large. That is, along with the closer and closer gradual reduction from the outer jacket, the diameter of the ball head or/and the ball head cavity of the outer shielding layer wrapped next to the outer jacket is the smallest, the diameter of the ball head or/and the ball head cavity of the outer shielding layer wrapped in the middle layer is larger, the diameter of the ball head or/and the ball head cavity of the outer shielding layer wrapped in the innermost layer is the largest, in all, the diameters of the ball head or/and the ball head cavity of the outer shielding layer wrapped in different layers are different, so that the heat consumption and the radiation attenuation can be greatly increased.
Furthermore, when the inner or/and outer shielding layers are wrapped, the ball head accommodating or/and the ball head accommodating cavity are wrapped in a staggered arrangement mode. The ball containing head or/and the ball containing head cavity are/is wrapped in a staggered mode to form a honeycomb-shaped space with a three-dimensional structure, and consumption and absorption of electromagnetic waves are facilitated.
The ball head of the inner shielding layer for accommodating the ball head or/and the cavity opening of the cavity for accommodating the ball head are/is arranged towards the direction of the conductive wire core; considering that the magnetic field of the conductive wire core is strong, the ball head or/and the cavity opening are wound towards the direction of the conductive wire core, and the electromagnetic waves can be absorbed and consumed quickly and preferentially.
Furthermore, the ball head containing the ball head or/and the cavity opening containing the ball head cavity of the outer shielding layer are arranged towards the direction of the outer protective layer; considering that the magnetic field and the temperature of the nuclear power station are higher, the ball heads or/and the cavity openings are arranged and wound towards the direction of the outer protective layer, and electromagnetic waves can be absorbed and consumed quickly and preferentially.
Furthermore, the filling layer, the belting layer, the heat insulation layer or the outer protective layer can be sprayed with the shielding liquid, and the shielding liquid is dried to form a shielding film, so that a better shielding effect can be achieved.
The invention has the following beneficial effects:
1. according to the invention, through the design of the ball head accommodating cavity, the ball head accommodating cavity and the through holes thereof, heat and radiated electromagnetic waves can be reflected and consumed for multiple times in the porous cavity channel, so that the absorption loss of the heat and the electromagnetic waves is increased, the radiation range is reduced, and meanwhile, the interference on a signal line is weakened; through the multi-layer structure design, the electromagnetic radiation is reduced, and the high temperature resistance is improved; through the double-layer shielding of the inner shielding layer and the outer shielding layer, the superposition effect of a magnetic field is reduced, and the radiation resistance of the cable is improved; electromagnetic shielding in a wider frequency range is realized through the design of shielding films with different fillers; and by optimizing multilayer designs such as gradient distribution multilayer structure design and honeycomb design, heat conduction and consumption are realized, absorption loss and multiple reflection attenuation are improved, and radiation is further reduced.
2. With signal cable integration in cable for power transmission, occupation space is little when laying, and has avoided the classification to lay the possibility that the in-process caused external force to damage, lays convenient with low costsly, and later maintenance is convenient.
3. The interference of the electric radiation of the power cable to the signal cable is avoided by adopting a classification shielding mode, the method is more scientific and reasonable, and the quality risk can be evaluated through quantification.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a cable in a medium voltage flame retardant power cable according to the present invention;
FIG. 2 is an enlarged view of a ball receiving cavity at A of FIG. 1 of a medium voltage flame retardant power cable according to the present invention;
FIG. 3 is an enlarged view of a ball receiving cavity at A-1 of FIG. 1 of a medium voltage flame retardant power cable of the present invention;
figure 4 is a schematic cross-sectional view of a medium voltage flame retardant power cable receiving bulb cavity of the present invention;
fig. 5 is a schematic cross-sectional view of a shielding film at a ball-end receiving cavity C of a medium voltage flame retardant power cable according to the present invention;
FIG. 6 is a schematic diagram of a peak staggering structure of a medium voltage flame retardant power cable according to the present invention;
FIG. 7 is an enlarged view of a peak staggering structure at E in FIG. 6 of the medium voltage flame retardant power cable of the present invention;
fig. 8 is a schematic view of the inner and outer shielding layer structures of a medium voltage flame retardant power cable according to the present invention;
FIG. 9 is a schematic view of an outer shielding layer bulb diameter increasing structure of a medium voltage flame retardant power cable according to the present invention;
FIG. 10 is a schematic view of an enlarged structure of the ball head diameter of the inner shield layer of the medium voltage flame retardant power cable according to the present invention;
FIG. 11 is a schematic diagram of equivalent circuit variation of a medium voltage flame retardant power cable according to the present invention;
fig. 12 is a schematic diagram of a variation of the axial cable surface U profile of a medium voltage flame retardant power cable according to the invention;
FIG. 13 is a schematic structural view of a copper strip processing apparatus for a medium voltage flame retardant power cable according to the present invention;
fig. 14 is a schematic view of a peak staggering arrangement structure of a medium voltage flame retardant power cable according to the present invention;
fig. 15 is a schematic structural view of a staggered peak arrangement example F of a medium voltage flame retardant power cable according to the invention;
in the drawings, the components represented by the respective reference numerals are listed below:
the cable comprises a cable core 1, a signal wire 2, a filling layer 3, a belting layer 4, a heat insulation layer 5, an outer shielding layer 6, an outer protective layer 7, a ball head accommodating cavity 8, an accommodating ball head 81, a through hole 9, a shielding film 10, glass fiber cloth 41, ceramic rubber 42, a conductive wire core 101, an insulating layer 102, an inner shielding layer 103, a printed panel 12, a groove 13, a mold part 14, a hole 15, a needle inserting device 16, a needle 17, a driving device 18, a pressing machine 19 and a pressing platform 20.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1-3, the medium-voltage flame-retardant power cable of the present invention includes a cable core 1, a tape layer 4 covering the cable core 1, a thermal insulation layer 5 covering the tape layer 4, an outer shielding layer 6 covering the thermal insulation layer 5, and an outer sheath 7 covering the outer shielding layer 6, where the cable core 1 includes a conductive wire core 101, an insulating layer 102 covering the conductive wire core 101, and an inner shielding layer 103 covering the insulating layer 102; signal wire 2 has been placed to 1 periphery of cable core, it has filling layer 3 to fill between 1 outer wall of cable core and 2 outer walls of signal wire and the 4 inner walls of band layer, internal shield layer 103 is equipped with and holds bulb 81, and external shield 6 is equipped with and holds bulb chamber 8.
The belting layer 4 comprises glass fiber cloth 41 and ceramic rubber 42 on two sides of the glass fiber cloth; the ceramic silicon rubber material has the effects of high insulation resistance, oil resistance and the like, and has strong advantages in complex environments such as nuclear power stations and the like.
The signal wire 2 comprises a communication cable, an optical fiber unit, a measuring cable and the like, and is customized according to requirements; 1 outer wall of cable core with it has filling layer 3 to fill between 2 outer walls of signal line and the 4 inner walls of band layer, and filling layer 3 uses inorganic paper rope to fill, and the effect that plays: firstly, the roundness of the multi-core cable is ensured; secondly, the heat insulation and flame retardant functions are achieved.
The heat insulation layer 5 is made of ceramic rubber 42, the ceramic rubber not only has the advantages of high insulation resistance, high temperature resistance and the like in complex environments such as nuclear power stations and the like, but also has a strong heat insulation effect, the temperature resistance grade of the ceramic rubber is improved to 130-180 ℃ after vulcanization by adopting an extrusion coating mode, the inner layer and the outer layer can be isolated, and an important ridge separating effect is achieved.
The inner shielding layer 103 or the outer shielding layer 6 is made of a non-magnetic metal belt, usually a non-magnetic copper belt; the outer protective layer 7 is extruded by adopting a B1-level polyolefin material, and the integrity of a finished wire cable product is ensured after extrusion.
Fig. 4-5 are schematic cross-sectional views of a ball-containing cavity of a medium-voltage flame-retardant power cable according to the invention; the head parts of the inner shielding layer 103 and the outer shielding layer 6, which are used for accommodating the ball head 81, are provided with through holes 9, the head parts of the inner shielding layer 103 and the outer shielding layer 6, which are used for accommodating the ball head cavity 8, are provided with through holes 9, or the two sides of the inner shielding layer 103 and the outer shielding layer 6, which are used for accommodating the ball head 81, are provided with through holes 9, or the two sides of the inner shielding layer 103 and the outer shielding layer 6, which are used for accommodating the ball head cavity 8, are provided with through holes 9, or the head parts and the two sides of the inner shielding layer 103 and the outer shielding layer 6, which are used for accommodating the ball head 81, are provided with through holes 9; and the accommodating ball head 81 or/and the accommodating ball head cavity 8 and the through hole 9 are/is coated with shielding liquid, and the shielding liquid is dried to form a shielding film 10. The heat and the electromagnetic waves are reflected and refracted for many times through the accommodating ball head 81, the accommodating ball head cavity 8, the through holes and the cavity channels thereof, so that the absorption loss of the electromagnetic waves is increased, and the radiation of a magnetic field is reduced; while also consuming and absorbing heat.
Example 1, schematic peak staggering of a medium voltage flame retardant power cable of the invention as described in fig. 6-7; as shown in fig. 6, a through hole 9 is formed in the head portion of the cable inner shielding layer 103, which receives the ball head 81, and when the inner shielding layer 103 is wrapped, the head portion of the cable inner shielding layer 81 is arranged opposite to the other head portion of the cable inner shielding layer, which is called a staggered peak arrangement; as shown in fig. 7, the head of the cable outer shielding layer 6, which accommodates the ball head cavity 8, is provided with a through hole 9, when the outer shielding layer 6 is wrapped, the ball head accommodating cavities 8 are arranged according to an inclination of 30 degrees, one peak is staggered with the other peak, and the arrangement is also called as staggered peak arrangement, which is another staggered peak arrangement; of course, other peak shifting arrangements are possible and can be designed by those skilled in the art as desired. Any side of the accommodating ball head cavity is provided with a certain inclination, and the heat and electromagnetic wave absorption and consumption of the accommodating ball head cavity 8 and the through holes 9 are fully improved through staggered layers and staggered peak arrangement.
Example 2, schematic orientation arrangement of a ball receiving head or a ball receiving head cavity of a medium voltage flame retardant power cable according to the present invention as shown in fig. 8-10; the ball heads of the inner cable shield layer 103, which receive the ball heads 81, are aligned in the direction of the conductive core 101. The outer cable shield 6 has its mouth, which receives the ball cavity 8, aligned in the direction of the outer jacket 7. The diameter of the ball head of the inner shielding layer 103, which accommodates the ball head 81, is gradually increased from the inside direction of the outside conductive wire core 101 when the inner shielding layer winds. The diameter of the cavity opening (or the bulb) of the outer shielding layer 6, which contains the bulb cavity 8, is gradually increased from the outer shielding layer 6 to the outer protective layer 7 when the outer shielding layer winds. By blocking the electromagnetic radiation by the shielding layer, accommodating the ability of the bulb cavity 8 to reflect to reduce the wave or ray effect, charged particles will lose energy and be attenuated by reaction with electrons in the potential barrier, and by combining elastic and inelastic scattering, the harmfulness of the electromagnetic radiation can be reduced.
Through scribble the shielding liquid at the bulb that holds bulb 81 and inside and outside holding bulb cavity 8, further improved the electromagnetic wave shielding ability. The shielding liquid mainly comprises the following components in parts by weight: 5 parts of reticular conductive filler, 5 parts of fibrous conductive filler, 10 parts of epoxy resin, 10 parts of diepoxy silane, 20 parts of high-temperature-resistant film-forming resin, 2 parts of silver-plated copper powder, 2 parts of silicon carbide powder, 0.5 part of electromagnetic shielding filler dispersing agent, 1 part of flatting agent, 1 part of curing agent and 30 parts of organic solvent. The high temperature resistant range of the high temperature resistant film forming resin is 300-800 ℃.
A preparation method of a medium-voltage flame-retardant power cable comprises the following steps:
s1, cable core manufacturing: wrapping an insulating layer 102 outside a conductive wire core 101 in an extrusion wrapping mode, pressing one or two surfaces of an inner shielding layer 103 into a plurality of accommodating ball heads or ball head accommodating cavity arrangements by using a pressing machine 19, or pressing into a plurality of accommodating ball heads and ball head accommodating cavity arrangements together, after the ball heads or ball head accommodating cavities are pressed, firstly perforating a plurality of pressed accommodating ball heads 81 by using a needle inserting device 16, so that each accommodating ball head 81 is provided with a through hole 9, and then wrapping the inner shielding layer 103 on the insulating layer 102 to obtain a cable core; as shown in fig. 13, a plurality of ball head accommodating models are arranged on the pressing plate surface of the pressing machine 19, a printed panel 12 is arranged on the pressing platform 20, a groove 13 is formed in the printed panel 12, a mold part 14 corresponding to the ball head accommodating models is arranged at the bottom of the groove 13, the ball head models are arranged at the bottom of the mold part 14, holes 15 are formed in two sides of each ball head model for needles to pass through, when the copper strip is pressed down by the pressing machine 19, the needle head inserting device 16 is driven by the driving device 18 to insert the needle head 17 into the needle hole 15, the needle head 17 is retracted after punching is completed, the ball head 81 is accommodated or the ball head accommodating cavity 8 is left with a through hole 9, and then the copper strip is wound. The processing method of the printed panel 12 comprises the following steps: a rectangular groove 13 is formed in a solid rectangular plate through a cutting machine, two ends of the groove 13 are cut to be 5mm low for placing copper strips, a die part 14 is formed in the bottom of the groove 13 through a laser cutting machine, holes are formed in the side face of the die part 14, and the printed panel 12 is processed. When the pressing machine 19 is used for pressing, the ball containing cavity 8 is formed by controlling the force and the speed of the pressing machine 19, and the size and the depth of the ball containing cavity 8 are controlled by the pressing machine 19 as required; the panel of the pressing machine 19 can also be a mixed panel of a ball head accommodating model and a ball head chamber accommodating model, and a mixed copper plate with a ball head accommodating model and a ball head chamber accommodating model can be pressed; or the panel of the pressing machine 19 is a flat plate, the pressing platform 20 is provided with a die part 14 corresponding to the ball head accommodating model, and the accommodating ball head 81 is manufactured by controlling the force and speed of the pressing machine 19 during pressing of the pressing machine 19.
S2, binding a belting layer: the cable core 1 is screwed together and filled with an inorganic paper filling rope, the signal wires 2 are inserted into the inorganic paper filling rope and arranged in a phase-by-phase manner, and the filling layer 3 is tightened by wrapping with a wrapping tape layer 4;
s3, extruding the heat insulation layer 5 to the periphery of the product prepared in the step S2 in an extruding and wrapping mode;
s4, pressing one or two surfaces of the outer shielding layer 6 into a plurality of arranged accommodating ball heads 81 or accommodating ball head cavities 8 by using a pressing machine 19, or pressing the accommodating ball heads 81 and the accommodating ball head cavities 8 at the same time, and wrapping the outer shielding layer 6 to the periphery of the product prepared in the S3;
s5, extruding and wrapping an outer protective layer: and extruding the outer protective layer 7 on the surface of the product prepared in the step S4 to prepare the cable.
In the preparation process of the inner or outer shielding layer in the steps S1 and S4, the accommodating ball 81 or the accommodating ball cavity 8 may be pressed, or the accommodating ball 81 and the accommodating ball cavity 8 may be pressed simultaneously in the inner or outer shielding layer.
In embodiment 4, the conductive core 101 selects copper as a conductor material, and a plurality of copper wires are sequentially and spirally wound together, so that the copper plays a role in power transmission; the method comprises the following steps of paying off a copper conductor at a constant speed from a paying-off device, extruding ceramic silicon rubber by an extruding machine, wrapping the ceramic silicon rubber on the copper conductor, enabling the copper conductor to enter a warm water tank, then entering a vulcanizing pipe for continuous vulcanization, positioning the other end of the conductor by a traction device, and taking up the conductor by a take-up device, wherein the length of the vulcanizing pipe is 30, 40, 50 or 60 meters. The vulcanization step is as follows: under the heating condition, raw rubber in the ceramic silicon rubber insulation and a vulcanizing agent are subjected to chemical reaction, so that the ceramic silicon rubber is crosslinked into macromolecules with a three-dimensional network structure from macromolecules with a linear structure, and the physical and mechanical properties, the temperature resistance and other properties of the rubber material are obviously improved; the ceramic silicon rubber on the surface of the conductor is vulcanized and then is converted from non-crosslinked insulation into crosslinked insulation, has the effects of high insulation resistance, oil resistance and the like, and has strong advantages in complex environments such as nuclear power stations and the like.
The inner shielding layer 103 is made of a non-magnetic copper strip, the non-magnetic copper strip is downwards pressed at a speed of 30m/min from the upper side by a pressing machine 19, a plurality of accommodating ball heads are formed on the copper strip, when the pressing machine 19 presses the copper strip, the needle head inserting device 16 is driven by a driving device 18 to insert the needle head 17 into the needle hole 15, the needle head 17 is retracted after the punching is finished, the accommodating ball head 81 is reserved with a through hole 9, and then the copper strip is wound. During production, a wrapping mode is adopted, the covering rate is 30% -35%, the multi-core cable is subjected to split-phase wrapping shielding, and when the multi-core cable is in normal operation, the copper belt can weaken or counteract the polarity of electric radiation generated by electrifying a single conductor or a plurality of conductors; in which the principle of electric radiation elimination (equivalent circuit diagram after the cable is electrified as shown in fig. 11 and the variation diagram of the distribution of the axial cable surface U as shown in fig. 12): in a good grounding environment, the surface of the insulating layer 102 has a certain resistance, so that potential distribution is possibly uneven in the axial direction of the cable to cause surface discharge of the cable, when a section of poor grounding is arranged in the middle of the shaft, distributed capacitance current forms a high potential area at two grounding points, the voltage drop delta U generated at the two ends is larger, the surface unit resistances R0 are the same, and high field strengths are formed at the two ends G and K to cause a discharge ignition phenomenon. Therefore, the copper strip is spirally lapped and wrapped to form a cylindrical concentric conductor, so that small current generated by the phenomenon and electric radiation generated by the small current can be eliminated.
The filling layer 3 is made of inorganic paper filling ropes, the cable cores 1 are connected together in a spiral mode, the inorganic paper filling ropes are filled, the signal wires 2 penetrate into the inorganic paper filling ropes and are arranged in a phase mode, the belting layer 4 is wrapped outside the inorganic paper filling ropes, and the cable cores 1 are fastened to form the composite wire core body. The roundness of the multi-core cable is ensured through the inorganic paper rope; the heat insulation and flame retardation effects are achieved, and heat is insulated under limited heat impact through the belting layer 4.
The heat insulation layer 5 adopts ceramic silicon rubber, and after the ceramic silicon rubber is vulcanized, the ceramic silicon rubber is extruded to the periphery of the core body of the composite wire in an extruding way.
The outer shielding layer 6 is made of a non-magnetic copper strip, the copper strip is downwards pressed at a speed of 15m/min in 6 kilograms from the upper side through a pressing machine 19, a plurality of accommodating ball head cavities 8 are formed in the copper strip, when the copper strip is pressed down through the pressing machine 19, the needle head inserting device 16 is driven by a driving device 18 to insert the needle head 17 into the needle hole 15, the needle head 17 is retracted after the punching is finished, the accommodating ball head cavities 8 are reserved with through holes 9, and then the copper strip is wound. During production, a lapping mode is adopted, the lapping rate is 10% -15%, the multi-core cable is subjected to overall lapping shielding, and when the multi-core cable operates normally, the copper strip shields an inner electric field on one hand and shields the interference of an external electromagnetic field to the inside.
The outer protective layer 7 is made of B1-grade polyolefin material, and the prepared product is extruded to form a complete cable.
Embodiment 5 is different from embodiment 4 in that after the ball head 81 or the ball head cavity 8 is filled with the through hole 9, the shielding liquid is sprayed on the ball head 81 or the ball head cavity 8 and the through hole 9, the shielding liquid is rapidly dried by a drying device to form a shielding film 10, and then the copper tape is wrapped and wound. The use amount, the form, the modification, the dispersion, the distribution, the orientation by an electric field and a magnetic field and the like of the conductive nano-filler and the magnetic nano-filler such as carbon series, metal series, ferrite and the like are optimized through the shielding film, so that the absorption loss, the reflection loss and the enhanced synergistic effect are improved.
In embodiment 6, the difference from embodiment 5 is that after the receiving bulb 81 or the receiving bulb cavity 8 is perforated with the through hole 9, the copper strip is immersed in the shielding liquid, and when the copper strip is pulled out, the copper strip is dried, so that the shielding film 10 is formed in the receiving bulb 81 or the receiving bulb cavity 8 and the through hole 9, and then the copper strip is wound.
Example 7 is different from example 6 in that the copper tape is wrapped in a staggered arrangement as shown in fig. 14-15.
In embodiment 8, the difference from embodiment 7 is that, when the copper strip of the inner shielding layer is wrapped in the staggered manner for the 2 nd time, the diameter of the accommodating ball head of the copper strip is smaller than that of the accommodating ball head when the copper strip is wrapped in the first time, and when the copper strip of the inner shielding layer is wrapped in the staggered manner for the 3 rd time, the diameter of the accommodating ball head of the copper strip is smaller than that of the accommodating ball head when the copper strip is wrapped in the second time, as shown in fig. 10. When the copper strip of the outer shielding layer is subjected to peak staggering wrapping for the 2 nd time, the diameter of the accommodating ball cavity of the copper strip is larger than that of the accommodating ball cavity when the copper strip is subjected to the first wrapping, and when the copper strip of the outer shielding layer is subjected to peak staggering wrapping for the 3 rd time, the diameter of the accommodating ball cavity of the copper strip is larger than that of the accommodating ball cavity when the copper strip is subjected to the second wrapping, as shown in fig. 9.
Table one shows comparative values of the power density of the electromagnetic radiation environment measured in different embodiments of the present invention.
Table one:
| examples | Electromagnetic radiation environment power density (μ w/c) | Performance of |
| Example one | <0.32 | Good effect |
| Example two | <0.21 | Good effect |
| EXAMPLE III | <0.03 | Is excellent in |
| Example four | <0.07 | Is excellent in |
| EXAMPLE five | <0.11 | Good effect |
| EXAMPLE six | <0.10 | Good effect |
| Existing common cable | <0.50 | Is poor |
Table II shows the test data of the cable shielding effect prepared by the invention on radio interference
Table two:
TABLE III shows the test results of the present invention for shielding electromagnetic radiation environment
Watch III
From the test results of the table I, the table II and the table III, the cable of the invention achieves higher high temperature resistance and electromagnetic radiation resistance.
In the description herein, references to the description of "one embodiment," "an example," "a specific example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best understand the invention for and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (8)
1. A medium-voltage flame-retardant power cable comprises a cable core, and a belting layer, a heat insulation layer, an outer shielding layer and an outer protective layer which are sequentially coated from inside to outside; the cable core consists of a conductive wire core, an insulating layer and an inner shielding layer; a filling layer is arranged between the cable core and the belting layer, and signal wires are placed in the filling layer; the shielding structure is characterized in that the inner shielding layer or/and the outer shielding layer is/are provided with a ball head accommodating or/and a ball head accommodating cavity, the inner shielding layer or/and the outer shielding layer is/are made of a non-magnetic copper strip material, the ball head accommodating is provided with a through hole, and a hollow cavity gap is formed inside the ball head accommodating cavity; the arrangement of the accommodating ball heads or/and the accommodating ball head cavities is staggered, the staggered arrangement mode comprises that the inclination of the accommodating ball heads or/and the accommodating ball head cavities is 30-60 degrees, and the accommodating ball heads or/and the accommodating ball head cavities are staggered; and the shielding film is formed after the shielding liquid is dried.
2. The medium voltage flame retardant power cable according to claim 1, wherein the receiving bulb cavity is provided with a through hole.
3. The medium voltage flame retardant power cable according to claim 1, wherein the shielding liquid mainly comprises, in parts by mass: 5-15 parts of reticular conductive filler, 5-15 parts of fibrous conductive filler, 10-20 parts of epoxy resin, 10-20 parts of diepoxy silane, 20-40 parts of high-temperature resistant film-forming resin, 2-5 parts of silver-plated copper powder, 2-5 parts of silicon carbide powder, 0.5-2 parts of electromagnetic shielding filler dispersing agent, 1-2 parts of flatting agent, 1-3 parts of curing agent and 30-50 parts of organic solvent; the high temperature resistant range of the high temperature resistant film forming resin is 300-800 ℃.
4. A method of making a medium voltage flame retardant power cable according to claim 1, comprising:
s1, cable core manufacturing: wrapping the insulating layer outside the conductive wire core in an extruding manner, and wrapping the inner shielding layer on the insulating layer to obtain a cable core;
s2, binding a belting layer: the cable cores are screwed together and filled with an inorganic paper filling rope, the signal wires are inserted into the inorganic paper filling rope and arranged in a split phase manner, and the inorganic paper filling layer is wrapped by a wrapping tape layer and is fastened;
s3, extruding the heat insulation layer to the periphery of the product prepared in the step S2 in an extruding and wrapping mode;
s4, wrapping the outer shielding layer to the periphery of the product prepared in the S3 in a wrapping mode;
s5, extruding and wrapping an outer protective layer: extruding an outer protective layer on the surface of the product prepared in the step S4 to prepare a cable;
the method is characterized in that the preparation steps of the inner shielding layer in the step S1 and/or the outer shielding layer in the step S4 are as follows: and a plurality of ball heads or/and ball head accommodating cavities are formed on one or two surfaces of the inner shielding layer or/and the outer shielding layer, through holes are formed in the ball heads or/and the ball head accommodating cavities, and then the inner shielding layer or/and the outer shielding layer are wrapped.
5. The preparation method of the medium-voltage flame-retardant power cable according to claim 4, wherein before the inner or outer shielding layer is wrapped, the ball-containing chamber and/or the ball-containing chamber are sprayed with or soaked in a shielding solution, and then dried to form a shielding film, and then the inner or outer shielding layer is wrapped.
6. The preparation method of the medium-voltage flame-retardant power cable according to claim 4, wherein when the accommodating ball head or/and the accommodating ball head cavity of the inner shielding layer are manufactured, the diameters of the accommodating ball head or/and the accommodating ball head cavity are manufactured step by step in the descending order.
7. The preparation method of the medium voltage flame retardant power cable according to claim 4, wherein when the accommodating bulb or/and the accommodating bulb cavity of the outer shielding layer is/are manufactured, the diameters of the accommodating bulb or/and the accommodating bulb cavity are manufactured step by step in the order from small to large.
8. The preparation method of the medium voltage flame retardant power cable according to claim 4 or 5, wherein the accommodating bulbs or/and the accommodating bulb cavities are lapped in a staggered arrangement when the inner or/and outer shielding layers are lapped.
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| CN104867604A (en) * | 2015-05-11 | 2015-08-26 | 国家电网公司 | Medium voltage flame-retardant frequency-conversion power cable |
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| CN104183331A (en) * | 2014-08-26 | 2014-12-03 | 山东华凌电缆有限公司 | IE-grade power cable for third-generation passive nuclear power plant gentle environment and production method |
| CN105273564A (en) * | 2015-11-24 | 2016-01-27 | 成都理工大学 | Electromagnetic environmental pollution preventing coating and preparation method thereof |
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