WO2018182075A1 - Câble d'alimentation - Google Patents

Câble d'alimentation Download PDF

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Publication number
WO2018182075A1
WO2018182075A1 PCT/KR2017/003583 KR2017003583W WO2018182075A1 WO 2018182075 A1 WO2018182075 A1 WO 2018182075A1 KR 2017003583 W KR2017003583 W KR 2017003583W WO 2018182075 A1 WO2018182075 A1 WO 2018182075A1
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WO
WIPO (PCT)
Prior art keywords
layer
paper
insulating layer
cable
insulating
Prior art date
Application number
PCT/KR2017/003583
Other languages
English (en)
Korean (ko)
Inventor
고경로
Original Assignee
엘에스전선 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 엘에스전선 주식회사 filed Critical 엘에스전선 주식회사
Publication of WO2018182075A1 publication Critical patent/WO2018182075A1/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
    • 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
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
    • H01B7/22—Metal wires or tapes, e.g. made of steel
    • 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 insulation strength of the insulating layer itself, the electric field applied from the insulating layer to the metal sheath is effectively alleviated uniformly, in particular, the return of the fault current is effectively ensured in the event of a ground fault or short circuit of the cable
  • the present invention relates to a power cable which can achieve safety and has no problem such as breakage of metallized paper when the cable is manufactured, while impregnating the insulating oil in the manufacturing process.
  • the ground insulation cable includes an OF (Oil Filled) cable for circulating low viscosity insulation oil, a Mass Impregnated Non Draining (MIND) cable impregnated with high viscosity insulation oil, and the OF cable has a limitation in the transmission length of hydraulic pressure for circulation of the insulation oil. It is not suitable for long distance transmission cables, and in particular, there is a problem that it is difficult to install insulating oil circulation facilities on the seabed, which is not suitable for submarine cables.
  • OF Oil Filled
  • MIND Mass Impregnated Non Draining
  • MIND cable is commonly used for long distance direct current transmission or subsea high voltage 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 wrapped in a plurality of layers in the insulating oil, the insulating paper is used, for example, kraft paper (Kraft paper), or a thermoplastic such as kraft paper and polypropylene (Polypropylene) resin Semi-synthetic paper laminated with resin can be used, or kraft paper and semi-synthetic paper can be used simultaneously.
  • the inner semiconducting layer 20 and the outer semiconducting layer 40 are formed by transversely winding semi-conductive paper such as carbon paper treated with carbon black on insulating paper.
  • the outer semiconducting layer 40 may be secured with the metal sheath layer 50 between the metal sheath layer 50 so that the return of the fault current is effectively secured in the event of a ground fault or a short circuit of the cable.
  • the metallization layer 42 may be further included for smooth electrical contact.
  • the insulating oil is kraft paper, which is an insulating paper well penetrated, there is no difficulty in impregnation, but the metal foil forming the metallized paper does not transmit,
  • the impregnating passage of the insulating oil is made.
  • high viscosity oil is used as the insulating oil. If the perforation is too large, it may cause a problem of not giving a constant sheet tension when the paper roll is rolled.
  • the insulation strength of the insulation layer is high, and the electric field applied from the insulation layer to the metal sheath is uniformly and effectively alleviated, and in particular, the return of fault current is effectively ensured in the event of a ground fault or a short circuit of the cable, thereby promoting safety.
  • the impregnation of the insulating oil is good, there is an urgent need for a power cable without problems such as breakage of metallized paper during cable manufacturing.
  • An object of the present invention is to provide a power cable having a high insulation strength of an insulation layer and which can effectively relax an electric field applied from the insulation layer to the metal sheath.
  • the lower layer includes one or more layers formed by the transverse winding of the semiconducting battery, and when transversely winding the semiconducting battery, it is transversely wound with a constant gap so that the semiconducting cells of the same layer do not overlap.
  • a power cable Provide a power cable.
  • the thickness of the inner insulating 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%.
  • a power cable is provided.
  • the power cable according to the present invention by precisely designing the structure of the outer semiconducting layer by the smooth electrical contact between the outer semiconducting layer and the metal sheath layer effectively ensures the return of the fault current in the event of a ground fault or short circuit of the cable to ensure safety It shows an excellent effect that can be planned.
  • 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.
  • the inner semiconducting layer 200 suppresses uneven electric field lines or conductor surface electric field distribution on the surface of the conductor 100, mitigates electric field distribution of cable internal insulation, and gaps between the conductor 100 and the insulating layer 300. It removes the electric field applied to the circuit and suppresses partial discharge and insulation breakdown at the part.
  • the insulating layer 300 is formed by wrapping the insulating paper in a plurality of layers, and the insulating paper is, for example, using a kraft paper or a semi-synthetic paper in which a thermoplastic resin such as kraft paper and a polypropylene resin is laminated. Can be used.
  • 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.
  • an internal insulation layer is controlled while controlling the maximum impulse electric field applied to the intermediate insulation layer 320 to 100 kV / mm or less.
  • the maximum impulse electric field value of the internal insulation layer is designed to be smaller than the maximum impulse electric field value of the intermediate insulation layer so that the high electric field does not act directly on the conductor or directly under the sheath.
  • the maximum impulse electric field applied to 320 is an inner electric field of the intermediate insulating layer 320, and the inner electric field is controlled to an allowable impulse electric field of the intermediate insulating layer 320, for example, 100 kV / mm or less. Deterioration of the insulating layer 320 can be suppressed.
  • 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 plastic film may be made of a polyolefin resin such as polyethylene, polypropylene, polybutylene, fluorine resin such as tetrafluoroethylene-hexafluoro polypropylene copolymer, ethylene-tetrafluoroethylene copolymer, Preferably it may be made of a polypropylene homopolymer resin excellent in heat resistance.
  • a polyolefin resin such as polyethylene, polypropylene, polybutylene
  • fluorine resin such as tetrafluoroethylene-hexafluoro polypropylene copolymer, ethylene-tetrafluoroethylene copolymer
  • ethylene-tetrafluoroethylene copolymer ethylene-tetrafluoroethylene copolymer
  • the semi-synthetic paper may be 40 to 70% of the total thickness of the plastic film.
  • the resistivity of the intermediate insulating layer 320 may be insufficient to increase the outer diameter of the cable, whereas when the thickness of the plastic film is greater than 70%, the manufacture of the semi-synthetic paper is remarkably difficult. It can be expensive and 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 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 heat generated during soft connection for the cable connection according to the present invention is applied to the insulating layer 300 to melt the plastic film of the semi-synthetic paper forming the intermediate insulating layer 320, the plastic from the heat
  • it is necessary to sufficiently secure the thickness of the outer insulating layer 330 and it is preferable to be formed thicker than the thickness of the inner insulating layer 310, the thickness of the outer insulating layer 330 It may be 1.5 to 30 times the thickness of the internal insulating layer 310.
  • the thickness of the sheet of semi-synthetic paper forming the intermediate insulating layer 320 is 70 to 200 ⁇ m
  • the thickness of the kraft paper forming the inner and outer insulating layers 310, 320 may be 50 to 200 ⁇ m.
  • the thickness of the kraft paper forming the inner and outer insulating layers 310 and 320 is greater than that of the kraft paper constituting the semi-synthetic paper.
  • the insulating oil impregnated in the insulating layer 300 uses a high viscosity insulating oil having a relatively high viscosity, unlike the insulating oil used in the conventional OF cable, it is generally not circulated at room temperature and its movement is very slow.
  • 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.
  • a kinematic viscosity of 60 ° C is 500 centistokes (cSt High viscosity insulating oil, in particular naphthenic insulating oil, polystyrene insulating oil, mineral oil, at least one insulating oil selected from the group consisting of alkyl benzene, polybutene-based synthetic oil, heavy alkylate and the like.
  • cSt High viscosity insulating oil in particular naphthenic insulating oil, polystyrene insulating oil, mineral oil, at least one insulating oil selected from the group consisting of alkyl benzene, polybutene-based synthetic oil, heavy alkylate and the like.
  • the outer semiconducting layer 400 may be formed by a transverse winding of a semi-conductive paper such as carbon paper treated with conductive carbon black on insulating paper, for example, a gap winding, that is, a transverse winding in the same layer.
  • the gaps are formed between the semiconducting cells that are traversed with a constant gap so that the cells do not overlap each other, and the gaps formed in an arbitrary layer are formed when there are a plurality of layers in which the semiconducting cells are traversed. It may be formed by the side wound so as to be covered by a semiconductor cell constituting the upper layer and the lower layer of the optional layer, the thickness of the outer semiconducting layer 400 may be about 0.1 to 3.0 mm.
  • the semiconductor cell is a gap winding, the insulating oil can be easily moved through the gap, thereby shortening the impregnation time of the cable to further improve the production yield.
  • the metallized paper 421 may have a structure in which a metal foil 421b such as aluminum tape, copper tape, aluminum foil, copper foil, etc. is laminated on the base paper 421a, and the base paper 421a is carbon paper. It may be the same semiconductor cell, kraft paper and the like. In addition, a plurality of perforations 421c may be present in the metallized paper 421 so that the insulating oil can easily penetrate the metal paper 421.
  • a metal foil 421b such as aluminum tape, copper tape, aluminum foil, copper foil, etc.
  • the base paper 421a is carbon paper. It may be the same semiconductor cell, kraft paper and the like.
  • a plurality of perforations 421c may be present in the metallized paper 421 so that the insulating oil can easily penetrate the metal paper 421.
  • the overlap rate is less than 20%
  • the overlapped portions of the overlapped metallization paper 421 and the semiconductor battery 422 are small, and thus the overlapped portion of the cable may be overlapped.
  • the overlapped parts are not overlapped again but collide with each other to be crushed or torn.
  • the above problems may occur even when the overlap ratio is greater than 80%.
  • the area ratio of the metalized paper and the carbon paper which appears as an appearance after the side winding, is less than 20% of the metalized paper and the area of the carbon paper. The ratio exceeds 80%, and the purpose of smooth electrical contact between the carbon paper and the metal sheath, which is the original purpose of the metallized paper, cannot be achieved.
  • FIG. 6 is an enlarged view of a metal foil applied to the metallized paper of the outer semiconducting layer in FIG. 3.
  • the metallized paper 421 may include a plurality of perforations 421c to pass the insulating oil.
  • the ratio (perforation area ratio) of the entire area of the plurality of perforations 421c included therein per unit area of the metallization paper 421 may be about 4 to 15%, and when the area ratio is less than about 4%, While the impregnation may not be smooth, the production yield of the cable may be lowered, whereas when the yield is greater than about 15%, the tensile strength of the metallization paper 421 is greatly reduced, so that the metallization paper 421 for forming the upper layer 420 is formed. When the winding of the metallization paper 421 may be broken.
  • the metallized paper 421 may be broken when the metallized paper 421 is rolled at a corresponding portion, whereas the metallized paper 421 may be broken. If the perforation area ratio is low, the impregnation of the insulating oil may not be smooth.
  • the shape of the perforation 421c is not particularly limited, and may be, for example, circular, elliptical, square, rectangular, and the like, and are circular in terms of ease of impregnation of insulating oil and securing tensile strength of the metallized paper 421.
  • the equivalent diameter d of the perforations 421c may be about 0.9 to 1.1 mm.
  • the circular conversion diameter means a diameter of a circle having the same area as the perforation 421c when the shape of the perforation 421c is not circular.
  • the circular conversion diameter (d) of the perforation (421c) is less than 0.9 mm, the impregnation of the insulating oil may not be smooth, whereas if more than 1.1 mm, the tensile strength of the metallization paper 421 is greatly reduced to the upper layer 420 When the metallization paper 421 is wound up to form the metallization paper 421 may be broken.
  • the metallized paper 421 may have a tensile strength of 9.1 kg / 15 mm or more due to the above-described structure and the arrangement, number, and diameter of the perforations 421c included in the metallized paper 421.
  • the outer semiconducting layer 400 may further include a copper wire direct fabric (not shown) between the upper layer 420 and the metal sheath layer 500.
  • the copper wire direct fabric is a structure in which 2 to 8 strands of copper wire are directly inserted into a nonwoven fabric, and a semiconductor cell, a metal paper, and the like wound up to form the outer semiconducting layer 400 are not released while performing an impregnation process. It functions to bind them firmly so as to maintain a structure and to prevent tearing or scratching from external force, and further, the outer semiconducting layer 400 and the metal sheath layer 500 are formed by the copper wire. It is possible to perform the function of smooth electrical contact.
  • the metal sheath layer 500 prevents leakage of insulating oil from the inside of the cable and prevents an electric field from going out of the cable to obtain an electrostatic shielding effect, and causes a ground fault or a short circuit of the cable through grounding at one end of the cable. When generated, it acts as a return of the fault current to promote safety, protects the cable from shocks, pressures, etc. outside the cable, and improves the cable's orderability 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 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 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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  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Insulated Conductors (AREA)

Abstract

La présente invention concerne un câble d'alimentation, et plus particulièrement, un câble sous-marin ou souterrain ultra-haute tension destiné à une transmission longue distance de courant continu. Plus précisément, la présente invention concerne un câble d'alimentation comprenant une couche isolante présentant une résistance diélectrique élevée, un champ électrique appliqué à partir de la couche isolante vers une gaine métallique étant uniformément et efficacement atténué, et, plus particulièrement, un circuit de retour d'un courant de défaut étant efficacement assuré lorsqu'un accident de mise à la terre ou de court-circuit du câble survient, ce qui permet de favoriser la sécurité, l'huile isolante étant bien imprégnée pendant le processus de fabrication, et des problèmes tels qu'un endommagement du papier métallisé étant éliminés pendant la fabrication du câble.
PCT/KR2017/003583 2017-03-30 2017-03-31 Câble d'alimentation WO2018182075A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2017-0041080 2017-03-30
KR20170041080 2017-03-30

Publications (1)

Publication Number Publication Date
WO2018182075A1 true WO2018182075A1 (fr) 2018-10-04

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ID=63678176

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Application Number Title Priority Date Filing Date
PCT/KR2017/003583 WO2018182075A1 (fr) 2017-03-30 2017-03-31 Câble d'alimentation

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WO (1) WO2018182075A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20150101353A (ko) * 2014-02-25 2015-09-03 엘에스전선 주식회사 종단접속부를 구비한 전력케이블
KR20150126736A (ko) * 2013-04-05 2015-11-12 에이비비 테크놀로지 리미티드 전송 시스템용 혼합 고체 절연 재료
KR20160097552A (ko) * 2015-02-09 2016-08-18 엘에스전선 주식회사 유연성 및 내굴곡성이 우수한 케이블
KR20160101643A (ko) * 2015-02-17 2016-08-25 엘에스전선 주식회사 전력 케이블
KR20160125907A (ko) * 2015-04-22 2016-11-01 엘에스전선 주식회사 전력 케이블 및 그 제조방법

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20150126736A (ko) * 2013-04-05 2015-11-12 에이비비 테크놀로지 리미티드 전송 시스템용 혼합 고체 절연 재료
KR20150101353A (ko) * 2014-02-25 2015-09-03 엘에스전선 주식회사 종단접속부를 구비한 전력케이블
KR20160097552A (ko) * 2015-02-09 2016-08-18 엘에스전선 주식회사 유연성 및 내굴곡성이 우수한 케이블
KR20160101643A (ko) * 2015-02-17 2016-08-25 엘에스전선 주식회사 전력 케이블
KR20160125907A (ko) * 2015-04-22 2016-11-01 엘에스전선 주식회사 전력 케이블 및 그 제조방법

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