WO2018182071A1 - Câble d'alimentation - Google Patents

Câble d'alimentation Download PDF

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Publication number
WO2018182071A1
WO2018182071A1 PCT/KR2017/003527 KR2017003527W WO2018182071A1 WO 2018182071 A1 WO2018182071 A1 WO 2018182071A1 KR 2017003527 W KR2017003527 W KR 2017003527W WO 2018182071 A1 WO2018182071 A1 WO 2018182071A1
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WIPO (PCT)
Prior art keywords
layer
insulating layer
thickness
semi
paper
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PCT/KR2017/003527
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English (en)
Korean (ko)
Inventor
이인회
남기준
김두기
박우정
Original Assignee
엘에스전선 주식회사
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Priority to PCT/KR2017/003527 priority Critical patent/WO2018182071A1/fr
Publication of WO2018182071A1 publication Critical patent/WO2018182071A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H01B1/04—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of carbon-silicon compounds, carbon or silicon
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/20—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances liquids, e.g. oils
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/02—Disposition of insulation
    • 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

Definitions

  • the present invention relates to power cables, in particular ultra high voltage underground or submarine cables for long distance direct current transmission.
  • the present invention has a high dielectric strength of the insulating layer itself, the electric field applied to the insulating layer is effectively alleviated, and in particular, the local potential difference in the soft layer direction in the insulating layer and thereby the creepage breakage in the cable length direction effectively.
  • the invention relates to a power cable that can be prolonged by suppression.
  • a power cable using a polymer insulator such as crosslinked polyethylene (XLPE) is used.
  • XLPE crosslinked polyethylene
  • an ultra-high voltage DC power transmission cable is impregnated with insulating oil in a cross winding insulating paper so as to surround a conductor.
  • Paper-insulated cables having an insulating layer are used.
  • the geo-insulated cable includes an OF (Oil Filled) cable for circulating low-viscosity insulating oil, a Mass Impregnated Non Draining (MIND) cable impregnated with high-viscosity or medium viscosity insulating oil, and the OF cable transmits hydraulic pressure for circulation of the insulating oil.
  • OF Oil Filled
  • MIND Mass Impregnated Non Draining
  • MIND cable is commonly used for long distance direct current transmission or subsea high voltage cable.
  • Figure 1 schematically shows the longitudinal cross-sectional structure of a conventional MIND cable.
  • a conventional MIND cable includes a conductor 10, an inner semiconducting layer 20 surrounding the conductor 10, an insulating layer 30 surrounding the inner semiconducting layer 20, and the insulation.
  • An outer semiconducting layer 40 surrounding the layer 30, a metal sheath layer 50 surrounding the outer semiconducting layer 40, a cable protection layer 60 surrounding the metal sheath layer 50, and the like. can do.
  • the insulating layer 30 is formed by impregnating the insulating paper 31 in the insulating oil in a plurality of layers, the insulating paper 31 is used, for example kraft paper (Kraft paper), kraft paper and polypropylene ( It is possible to use a semi-synthetic paper laminated with a thermoplastic resin such as Polypropylene) or kraft paper and semi-synthetic paper at the same time.
  • the insulating paper 31 may be rolled up by a gap winding rolled up with a certain gap so that the insulating paper 31 rolled up in the same layer does not overlap each other, as shown in FIG. 1.
  • the insulation strength of the insulation layer is high, and the electric field applied to the insulation layer is effectively alleviated, and in particular, the life span is effectively suppressed by the local potential difference in the soft layer direction in the insulation layer and thereby the creepage breakage in the cable length direction.
  • An object of the present invention is to provide a power cable having a high insulation strength of an insulation layer and capable of effectively and uniformly relaxing an electric field applied to the insulation layer.
  • a semi-synthetic paper including a semi-conductor cell stacked on the upper or lower surface is formed by being rolled up by a gap winding and impregnated with insulating oil, and the gap winding is rolled up so that a constant gap is formed between the semi-synthetic paper and the gap is formed. ) Is rolled in such a way that it is covered by the new semi-synthetic paper when the new semi-synthetic paper is rolled on top of the semi-synthetic paper and at the same time repeating one or more times so that it is cross-wound to form a gap between the new semi-synthetic paper. To provide power cables.
  • the semi-synthetic paper provides a power cable, characterized in that it comprises a plastic film and a semiconductor cell laminated on the upper and lower surfaces of the plastic film.
  • the semi-synthetic paper characterized in that it comprises a plastic film, a semiconductor cell laminated on the upper or lower surface of the plastic film and kraft paper laminated on the other side of the plastic film, power cable.
  • a width of the gap is 5 to 15% of the width of the semi-synthetic paper transversely wound by the gap winding.
  • the semiconductor battery provides a power cable, characterized in that it comprises a carbon paper coated with carbon black on insulating paper.
  • the inner insulation layer and the outer insulation layer is formed by kraft paper is rolled up and impregnated with an insulating oil, based on the total thickness of the insulation layer, the thickness of the inner insulation layer is 1 to 10%, The thickness of the intermediate insulating layer is 75% or more, the thickness of the outer insulating layer is 5 to 15%, characterized in that the resistivity of the inner insulating layer and the outer insulating layer is smaller than the resistivity of the intermediate insulating layer, Provide the cable.
  • the thickness of the outer insulating layer is greater than the thickness of the inner insulating layer, provides a power cable.
  • the thickness of the outer insulating layer is characterized in that the power cable, characterized in that 1 to 30 times the thickness of the inner insulating layer.
  • the thickness of the inner insulation layer is 0.1 to 2.0 mm
  • the thickness of the outer insulation layer is 0.1 to 3.0 mm
  • the thickness of the intermediate insulation layer is 15 to 25 mm. .
  • the thickness of the plastic film characterized in that 40 to 70% of the total thickness of the semi-synthetic paper, provides a power cable.
  • the thickness of the semi-synthetic paper is 70 to 200 ⁇ m
  • the thickness of the kraft paper of the inner insulating layer and the outer insulating layer is 50 to 150 ⁇ m, it provides a power cable.
  • the plastic film is provided with a polypropylene homopolymer resin, it provides a power cable.
  • the insulating oil provides a power cable, characterized in that the kinematic viscosity of 60 °C or more than 5 centistokes (Cst).
  • the power cable according to the present invention exhibits an excellent effect of having high insulation strength of itself and an electric field applied to the insulation layer can be effectively and uniformly relaxed by precisely designing the structure of the insulation layer.
  • the power cable according to the present invention is excellent in that the life can be extended by effectively suppressing the local potential difference in the soft layer direction in the soft layer direction and thereby the creepage breakage in the cable length direction through the new structure of the insulating paper applied to the insulating layer. Effect.
  • Figure 1 schematically shows the longitudinal cross-sectional structure of a conventional MIND cable.
  • Figure 2 shows schematically a cross section of a power cable according to the invention.
  • FIG. 3 is a schematic cross-sectional view of the power cable of FIG. 2.
  • FIG. 4 is a graph schematically illustrating a process in which an electric field is relaxed in an insulating layer of a power cable according to the present invention.
  • FIG. 5 is a graph schematically illustrating a process of relaxing an electric field inside an intermediate insulation layer by comparing a conventional power cable with a power cable according to the present invention.
  • Figure 6 schematically shows the electric field distribution according to the semi-synthetic structure of the intermediate insulating layer in the power cable according to the present invention.
  • FIGS. 2 and 3 schematically show the cross-sectional and longitudinal cross-sectional structures of one embodiment of a power cable according to the invention, respectively.
  • the power cable according to the present invention includes a conductor 100, an inner semiconducting layer 200 surrounding the conductor 100, and an insulating layer surrounding the inner semiconducting layer 200 ( 300, an outer semiconducting layer 400 surrounding the insulating layer 300, a metal sheath layer 500 surrounding the outer semiconducting layer 400, and a cable protection layer surrounding the metal sheath layer 500 ( 600) and the like.
  • the conductor 100 is a movement path for electric current for transmission, and has high electrical conductivity to minimize power loss, and has high purity copper (Cu), aluminum (Al), etc. having appropriate strength and flexibility required for use as a conductor of a cable.
  • it may be made of a linkage line having a high elongation and a high conductivity.
  • the cross-sectional area of the conductor 100 may be different depending on the amount of power transmission, the use of the cable.
  • the conductor 100 may be composed of a circular compression conductor compressed by placing a flat element wire in multiple layers on a flat conductor or a circular center line composed of multiple flat angle wires on a circular center line.
  • the conductor 100 made of a flat conductor formed by a so-called keystone method has a high area ratio of the conductors, so that the outer diameter of the cable can be reduced, and the cross-sectional area of each element wire can be formed to be large. It is economical because it can reduce the number. Moreover, since there are few voids in the conductor 100 and the weight of the insulating oil contained in the conductor 100 can be made small, it is effective.
  • the inner semiconducting layer 200 suppresses electric field distortion and electric field concentration due to surface unevenness of the conductor 100, thereby interfacing the inner semiconducting layer 200 and the insulating layer 300 or inside the insulating layer 300. It functions to suppress partial discharge and insulation breakdown caused by electric field concentrated on.
  • the inner semiconducting layer 200 may be formed of a semi-conductive paper such as a film formed from a polymer composite material in which conductive material such as carbon black or carbon black coated with a conductive material such as carbon black is coated on insulating paper. It may be formed by a transverse winding, the thickness of the inner semiconducting layer 200 may be about 0.2 to 3.0 mm.
  • the insulating layer 300 is formed by transversing the insulating paper into a plurality of layers, and the insulating paper is semi-synthesized using, for example, kraft paper or a thermoplastic resin such as a semiconductor battery and a polypropylene resin. Can be used.
  • the insulating layer 300 includes an inner insulating layer 310, an intermediate insulating layer 320 and an outer insulating layer 330, the inner insulating layer 310 and the outer
  • the insulating layer 330 is made of a material having a lower resistivity than the intermediate insulating layer 320, whereby the inner insulating layer 310 and the outer insulating layer 330 are each connected to the conductor 100 when the cable is operated.
  • FIG. 4 is a graph schematically illustrating a process in which an electric field is relaxed in an insulating layer of a power cable according to the present invention.
  • a direct current (DC) electric field is relaxed in the inner insulation layer 310 and the outer insulation layer 330 having a relatively low resistivity, thereby directly above the conductor 100 and directly below the metal sheath layer 500.
  • the impulse electric field means an electric field applied to the cable when an impulse voltage is applied to the cable.
  • the maximum impulse electric field value of the internal insulation layer 310 is designed to be smaller than the maximum impulse electric field value of the intermediate insulation layer 320 so that the high electric field does not act directly on or under the sheath.
  • the maximum impulse electric field applied to the intermediate insulating layer 320 is an inner electric field of the intermediate insulating layer 320, and the inner electric field is an allowable impulse electric field of the intermediate insulating layer 320, for example, 100 kV / mm.
  • the high electric field is suppressed from being applied to the inner insulation layer 310 and the outer insulation layer 330, particularly a cable connection member vulnerable to an electric field, and further, the performance with the intermediate insulation layer 320 can be minimized. It is possible to suppress the deterioration and to suppress the decrease in the dielectric strength and other physical properties of the insulating layer 300, resulting in a compact cable with a higher impulse withstand voltage than the cable. Shortening can be suppressed.
  • the inner insulating layer 310 and the outer insulating layer 330 may be formed by transversely kraft paper made of kraft pulp and impregnated with an insulating oil, respectively.
  • the insulating layer 310 and the outer insulating layer 330 may have a lower resistivity and a higher dielectric constant than the intermediate insulating layer 320.
  • the kraft paper can be prepared by washing the kraft pulp with deionized water in order to remove the organic electrolyte in the kraft pulp to obtain good dielectric loss tangent and permittivity.
  • the intermediate insulating layer 320 may be a semi-conductive paper 321a on one of the upper and lower surfaces of the plastic film 321b, as shown in an enlarged view (A) of FIG. 3.
  • it can be formed by transversely winding a semi-synthetic paper 321, in which a carbon paper coated with a conductive material such as carbon black, a film formed from a polymer composite material in which conductive material such as carbon black is dispersed, and impregnating insulating oil.
  • the semiconductor cell 321a ' is stacked on the upper or lower surface of the plastic film 321b', and the kraft paper or the semiconductor cell 321c 'is disposed on the other surface.
  • the laminated semisynthetic paper 321 ' can be rolled up and impregnated with insulating oil.
  • the semi-synthetic papers 321 and 321 ' are transversely wound so that a constant gap is formed between the gap windings, that is, between the semi-synthetic papers 321 and 321', and the gap is formed on top of the semi-synthetic papers 321 and 321 '.
  • the new semisynthetic paper 321, 321 ' is rolled up, it is repeatedly covered so as to be covered by the new semi-synthetic paper 321, 321' and at the same time there is also a gap between the new semi-synthetic paper 321, 321 '.
  • the semi-synthetic papers 321 and 321 ' may be transversely wound by the gap windings, so that the transverse efficiency may be improved, and the productivity of the cable may be improved. ) Can be slid without colliding with each other to improve the flexibility of the cable.
  • the width of the gap may be 5 to 15% of the width of the semi-synthetic paper (321, 321 ') so that the semi-synthetic paper (321, 321') does not collide with each other when the cable is bent.
  • the power cable according to the present invention is present in each of the gap (gap) by the width and height of each of the gap (gap) or by the contraction, expansion, movement, etc. of the insulating oil impregnated in the insulating layer (30).
  • the semiconductor cells 321a and 321a which are stacked on the upper or lower surfaces of the semi-synthetic papers 321 and 321 'and have electric conductivity even in a situation where a local potential difference may occur between the gaps due to different amounts of insulating oil. ') Can maintain the equipotential between the gaps, thereby effectively suppressing the local potential difference in the soft layer direction in the insulating layer and thereby the creepage breakage in the cable length direction.
  • FIG. 5 is a graph schematically illustrating a process of relaxing an electric field inside an intermediate insulation layer by comparing a conventional power cable with a power cable according to the present invention.
  • the semi-synthetic papers 321 and 321 ' are stacked on the top or bottom surfaces of the plastic films 321b and 321b' or both, the semi-synthetic papers 321a and 321a 'are conventionally semi-synthesized. Compared to the case where kraft paper is laminated on the upper and lower surfaces of the paper plastic film, a more uniform distribution of the electric field applied to the intermediate insulating layer 320 may be achieved.
  • Figure 6 schematically shows the electric field distribution according to the semi-synthetic structure of the intermediate insulating layer in the power cable according to the present invention.
  • a semiconductor cell 321 a ′ is stacked on an upper surface or a lower surface of the plastic film 321 b ′, and a kraft paper 321 c ′ is stacked on another surface thereof.
  • the semi-synthetic paper (321 ') shares a portion of the electric field applied to the semiconductor cell (321a')
  • the thickness of the semi-synthetic paper 321 ′ and the insulating layer 320 can be adjusted more thinly than the case in which the cells 321 a ′ are stacked. As a result, the outer diameter of the cable may be reduced and the flexibility may be improved.
  • the intermediate insulating layer 320 formed includes the plastic films 321b and 321b ', a higher resistivity, a lower dielectric constant, and a higher DC breakdown voltage than the inner insulating layer 310 and the outer insulating layer 330.
  • impulse breakdown voltage, and the outer diameter of the cable can be reduced by direct current due to the high resistivity of the intermediate insulating layer 320 and impulsively by the low dielectric constant.
  • the plastic films 321b and 321b' have an insulating oil impregnated in the insulating layer 300 due to heat generation during operation of the cable. It is possible to restrain movement toward 400 to suppress the generation of deoiled voids caused by the movement of the insulating oil, and consequently to suppress electric field concentration and dielectric breakdown caused by the deoiled voids.
  • the plastic films 321b and 321b ' may be formed of polyolefin resins such as polyethylene, polypropylene, and polybutylene, fluorine such as tetrafluoroethylene-hexafluoropolypropylene copolymer, and ethylene-tetrafluoroethylene copolymer. It may be made of a resin, preferably made of a polypropylene homopolymer resin having excellent heat resistance.
  • the semi-synthetic papers 321 and 321 ' may have a thickness of 40 to 70% of the total thickness of the plastic films 321b and 321b'.
  • the thickness of the plastic film 321b, 321b ' is less than 40% of the total thickness of the semi-synthetic paper 321, 321', the resistivity of the intermediate insulating layer 320 may be insufficient, and the outer diameter of the cable may increase, whereas 70% If exceeded, the production of semi-synthetic papers 321 and 321 'becomes remarkably difficult and may be expensive.
  • the inner insulating layer 310 may have a thickness of 1 to 10% of the total thickness of the insulating layer 300, and the outer insulating layer 330 may have a thickness of 5 to 15% of the total thickness of the insulating layer 300.
  • the intermediate insulating layer 320 may have a thickness of 75% or more of the total thickness of the insulating layer 300.
  • the maximum impulse electric field value of the inner insulation layer 310 may be lower than the maximum impulse electric field value of the intermediate insulation layer 320. If the thickness of the inner insulation layer is increased more than necessary, the maximum impulse electric field value of the intermediate insulation layer 310 becomes larger than the allowable maximum impulse electric field value, and in order to alleviate this, the cable outer diameter is increased. Done.
  • the outer insulating layer 330 preferably has a sufficient thickness than the inner insulating layer, which will be described later.
  • the internal insulation layer 310 and the external insulation layer 330 having a small resistivity are provided to prevent the direct current high electric field from being applied directly above the conductor 100 and directly below the metal sheath layer 500.
  • the thickness of the intermediate insulating layer 320 with high resistivity is designed to 75% or more, it is possible to reduce the cable outer diameter.
  • the inner insulation layer 310, the intermediate insulation layer 320, and the outer insulation layer 330 constituting the insulation layer 300 each have the precisely controlled thickness, so that the insulation layer ( 300 may have a desired dielectric strength while minimizing the outer diameter of the cable.
  • the DC and impulse electric field applied to the insulating layer 300 can be designed most efficiently, and a high electric field of DC and impulse is applied directly above the conductor 100 and directly below the metal sheath layer 500. It can suppress that, especially the insulation strength of the cable connection member which is weak to an electric field, and the fall of other physical properties can be avoided.
  • the thickness of the outer insulating layer 330 is greater than the thickness of the inner insulating layer 310, for example, in a cable of 500 kV DC, the thickness of the inner insulating layer 310 is 0.1 to 2.0 mm.
  • the thickness of the outer insulating layer 330 may be 1.0 to 3.0 mm, and the thickness of the intermediate insulating layer 320 may be 15 to 25 mm.
  • the thickness of the outer insulation layer 330 may be 1 to 30 times the thickness of the inner insulation layer 310.
  • the thickness of the kraft paper forming the inner and outer insulating layers 310 and 320 may be 50 to 200 ⁇ m.
  • the thickness of the kraft paper forming the inner and outer insulating layers (310,320) is too thin, the strength is insufficient, can cause mechanical damage when the paper rolls, and the number of side windings for forming the insulating layer of the desired thickness is increased
  • Productivity of the kraft paper may be reduced, and the total volume of the gap between the kraft papers forming the main passage of the insulating oil when the kraft paper is transversely reduced may take a long time when the insulating oil is impregnated, and the content of the insulating oil impregnated is lowered, thereby reducing the desired dielectric strength. It may be difficult to implement.
  • the insulating oil impregnated in the insulating layer 300 is fixed without being circulated in the cable length direction like a low viscosity insulating oil used in a conventional OF cable, an insulating oil having a relatively high viscosity is used.
  • the insulating oil may perform a lubrication role to facilitate the movement of the insulating paper when the cable is bent, as well as the function of implementing the desired dielectric strength of the insulating layer 300.
  • the insulating oil is not particularly limited but may be a medium viscosity insulating oil having a kinematic viscosity of 5 to 500 centistokes (cSt) at 60 ° C., or a high viscosity insulating oil having a kinematic viscosity of 60 ° C. or more at 500 centistokes (cSt) or more.
  • a medium viscosity insulating oil having a kinematic viscosity of 5 to 500 centistokes (cSt) at 60 ° C. or a high viscosity insulating oil having a kinematic viscosity of 60 ° C. or more at 500 centistokes (cSt) or more.
  • one or more insulating oils selected from the group consisting of naphthenic insulating oils, polystyrene insulating oils, mineral oils, alkyl benzene or polybutene synthetic oils, heavy alkylates, and the like can be synthe
  • the kraft paper constituting the inner insulating layer 310, the intermediate insulating layer 320 and the outer insulating layer 330 are formed to a desired thickness, respectively
  • each of the semi-synthetic paper is rolled up a plurality of times, and vacuum dried to remove residual moisture of the insulating layer 300, and then the insulating oil is heated to a high temperature impregnation temperature, for example, 100 to 120 ° C. under a high pressure environment.
  • a high temperature impregnation temperature for example, 100 to 120 ° C. under a high pressure environment.
  • the kraft paper constituting the inner insulating layer 310, the intermediate insulating layer 320 and the outer insulating layer 330 are formed to a desired thickness, respectively
  • each of the semi-synthetic paper is rolled up a plurality of times, and vacuum dried to remove residual moisture of the insulating layer 300, and then the insulating oil is heated to a high temperature impregnation temperature, for example, 100 to 120 ° C. under a high pressure environment.
  • a high temperature impregnation temperature for example, 100 to 120 ° C. under a high pressure environment.
  • the outer semiconducting layer 400 suppresses non-uniform electric field distribution between the insulating layer 300 and the metal sheath layer 500, mitigates electric field distribution, and removes the insulating layer from the various types of metal sheath layer 500. 300) to physically protect.
  • the outer semiconducting layer 400 may be formed by a transverse winding of a semi-conductive paper, such as, for example, carbon paper treated with conductive carbon black on insulating paper, and preferably formed by the transverse winding of the semiconducting battery.
  • a semi-conductive paper such as, for example, carbon paper treated with conductive carbon black on insulating paper
  • the lower layer and the semiconductor cell and the metallization paper may include an upper layer formed to be transversely wound in a gap winding or an empty winding.
  • the metallization paper and the semiconductor cell may be alternately rolled so as to overlap, for example, about 20 to 80%.
  • the metallized paper may have a structure in which a metal foil such as aluminum tape and aluminum foil is laminated on a base paper such as kraft paper or carbon paper, and the insulating oil easily penetrates into a semiconductor cell, an insulating paper, a semi-synthetic paper, and the like below the metal foil.
  • a plurality of perforations may exist so that the semiconductor cell of the lower layer is in smooth electrical contact with the metal foil of the metallized paper through the semiconductor cell of the upper layer, and as a result, the external semiconducting layer 400 and the As the metal sheath layer 500 is in smooth electrical contact, a uniform electric field distribution may be formed between the insulating layer 300 and the metal sheath layer 500.
  • the outer semiconducting layer 400 may further include a copper wire direct fabric (not shown) between the metal sheath layer 500.
  • the copper wire direct fabric has a structure in which 2 to 8 strands of copper wire are directly inserted into a nonwoven fabric and performs a function of smoothly and electrically contacting the outer semiconducting layer 400 and the metal sheath layer 500 by the copper wire.
  • the wound semi-conductor cell, metallized paper, etc. may perform a function of tightly binding them so as to maintain the above-described structure without being released. As the metal sheath layer 500 moves during bending, damage to the metallized paper or the like may be prevented.
  • the metal sheath layer 500 prevents the insulating oil from leaking to the outside of the cable, and fixes the voltage applied to the cable during direct current transmission between the conductor 100 and the metal sheath layer 500 so as to ground at one end of the cable. It acts as a return of fault current in the event of a ground fault or short circuit of the cable to protect safety, protect the cable from shocks, pressures, etc. outside the cable, and improve cable order and flame retardancy.
  • the metal sheath layer 500 may be formed by, for example, a soft sheath made of pure lead or lead alloy.
  • the soft sheath has a relatively low electric resistance, which serves as a large current collector, and can further improve cable ordering, mechanical strength, and fatigue characteristics when formed as a seamless type. have.
  • the soft psi is a surface of the anti-corrosion compound, for example, in order to further improve the corrosion resistance, water resistance of the cable and the adhesion between the metal sheath layer 500 and the cable protection layer 600, Blown asphalt, or the like.
  • the cable protection layer 600 includes, for example, a metal reinforcement layer 630 and an outer sheath 650, and further includes an inner sheath 610 and bedding layers 620 and 640 disposed above and below the metal reinforcement layer 630. It can be included as.
  • the inner sheath 610 improves the corrosion resistance, the degree of ordering of the cable, and performs a function of protecting the cable from mechanical trauma, heat, fire, ultraviolet rays, insects or animals.
  • the inner sheath 610 is not particularly limited, but may be made of polyethylene having excellent cold resistance, oil resistance, chemical resistance, and the like, or polyvinyl chloride having excellent chemical resistance, flame resistance, and the like.
  • the metal reinforcement layer 630 may be formed of a galvanized steel tape, a stainless steel tape, etc. to perform a function of protecting a cable from mechanical shock and to prevent corrosion, and the galvanized steel tape may have an anti-corrosion compound on its surface. Can be applied.
  • the bedding layers 620 and 640 disposed above and below the metal reinforcing layer 630 may perform a function of alleviating impact, pressure, and the like from the outside, and may be formed by, for example, a nonwoven tape.
  • the metal reinforcement layer 630 may be provided directly on the metal sheath layer 500 or through the bedding layers 620 and 640.
  • the expansion deformation of the metal sheath layer 500 by the high temperature expansion of the insulating oil in the metal reinforcing layer 630 is suppressed to improve the mechanical reliability of the cable and at the same time, the insulating layer 300 and the metal sheath layer 500.
  • the portion of the semiconducting layers 200 and 400 is intrinsically pressured to improve the dielectric strength.
  • the outer sheath 650 has substantially the same functions and characteristics as the inner sheath 610, and fires in submarine tunnels, land tunnel sections, etc. are used in the region because they are dangerous factors that greatly affect the safety of personnel or facilities.
  • the outer sheath of the cable is applied to polyvinyl chloride excellent in flame retardant properties, the cable outer sheath of the pipe section can be applied to polyethylene with excellent mechanical strength and cold resistance.
  • the metal sheath 500 may be provided with a metal reinforcing layer 630 immediately omitted, and a bedding layer may be provided inside and outside the metal reinforcing layer 630 as necessary. have. That is, the metal sheath layer may be formed to be provided with a bedding layer, a metal reinforcing layer, a bedding layer and an outer sheath sequentially.
  • the metal reinforcement layer 630 allows deformation of the metal sheath 500, but suppresses the change in the outer circumference, it is preferable in view of the fatigue characteristics of the metal sheath 500, and the cable insulation layer in the metal sheath 500 during cable energization.
  • the cable protection layer 600 may further include, for example, an outer serving layer 670 made of an iron sheath 660 and polypropylene yarn.
  • the outer wire sheath 660, the outer serving layer 670 may perform a function of additionally protecting the cable from the sea current, reefs and the like.

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  • Spectroscopy & Molecular Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Insulated Conductors (AREA)

Abstract

La présente invention concerne un câble d'alimentation, et plus particulièrement, un câble sous-marin ou souterrain à ultra-haute tension destiné à la transmission longue distance de courant continu. Plus précisément, la présente invention concerne un câble d'alimentation pourvu d'une couche d'isolation présentant en elle-même une résistance diélectrique élevée, et permettant une atténuation efficace d'un champ électrique appliqué à la couche d'isolation, et plus particulièrement, une inhibition efficace d'une différence potentielle locale au niveau de la direction latérale dans la couche d'isolation, ainsi qu'un contournement de surface dans la direction longitudinale du câble ainsi provoqué, ce qui permet de prolonger la durée de vie du câble d'alimentation.
PCT/KR2017/003527 2017-03-30 2017-03-30 Câble d'alimentation WO2018182071A1 (fr)

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PCT/KR2017/003527 WO2018182071A1 (fr) 2017-03-30 2017-03-30 Câble d'alimentation

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JP2005346981A (ja) * 2004-05-31 2005-12-15 Toshiba Corp 電力ケーブルの性能劣化防止方法およびこの性能劣化防止方法を実施する電力ケーブル
JP2015118840A (ja) * 2013-12-19 2015-06-25 株式会社ビスキャス 遮水テープ、遮水ケーブル
KR20150126736A (ko) * 2013-04-05 2015-11-12 에이비비 테크놀로지 리미티드 전송 시스템용 혼합 고체 절연 재료
KR20160101643A (ko) * 2015-02-17 2016-08-25 엘에스전선 주식회사 전력 케이블
KR20160121873A (ko) * 2015-04-13 2016-10-21 엘에스전선 주식회사 전력 케이블

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JP2005346981A (ja) * 2004-05-31 2005-12-15 Toshiba Corp 電力ケーブルの性能劣化防止方法およびこの性能劣化防止方法を実施する電力ケーブル
KR20150126736A (ko) * 2013-04-05 2015-11-12 에이비비 테크놀로지 리미티드 전송 시스템용 혼합 고체 절연 재료
JP2015118840A (ja) * 2013-12-19 2015-06-25 株式会社ビスキャス 遮水テープ、遮水ケーブル
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KR20160121873A (ko) * 2015-04-13 2016-10-21 엘에스전선 주식회사 전력 케이블

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