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WO2018182070A1 - Câble d'alimentation - Google Patents

Câble d'alimentation Download PDF

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Publication number
WO2018182070A1
WO2018182070A1 PCT/KR2017/003526 KR2017003526W WO2018182070A1 WO 2018182070 A1 WO2018182070 A1 WO 2018182070A1 KR 2017003526 W KR2017003526 W KR 2017003526W WO 2018182070 A1 WO2018182070 A1 WO 2018182070A1
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WO
WIPO (PCT)
Prior art keywords
layer
paper
insulating
insulating layer
semiconducting
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/KR2017/003526
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English (en)
Korean (ko)
Inventor
이인회
남기준
김두기
박우정
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LS Cable and Systems Ltd
Original Assignee
LS Cable and Systems Ltd
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 LS Cable and Systems Ltd filed Critical LS Cable and Systems Ltd
Priority to PCT/KR2017/003526 priority Critical patent/WO2018182070A1/fr
Publication of WO2018182070A1 publication Critical patent/WO2018182070A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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 self-insulation strength of the insulating layer, the electric field applied to the insulating layer is effectively alleviated, and in particular, the voids in which no oil is present in the insulating layer and the like are suppressed from occurring.
  • the present invention relates to a power cable which can prolong the lifespan by effectively suppressing partial discharge, insulation breakdown and the like caused by an electric field concentrated in the field.
  • 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.
  • the MIND cable is formed by wrapping insulation paper such as kraft paper, semi-synthetic paper laminated with thermoplastic resin such as kraft paper and polypropylene resin when the insulation layer is formed in a plurality of layers, and an internal semiconducting layer inside and outside the insulation layer and
  • the outer semiconducting layer may be formed by enclosing a semiconducting battery such as carbon black paper in a plurality of layers, and the insulating oil is impregnated in the semisynthetic paper, the semiconducting battery, and the like.
  • the insulating paper which forms the insulating layer and the semiconducting layer by the heat generation of the conductor during the operation thereof, the insulating oil impregnated in the semiconductor battery, and the insulating oil filled in the gap generated when the insulating paper and the semiconductor battery are wound are expanded. While the insulating oil impregnated in the insulating layer is moved to the inside and the outside of the insulating layer, and when the electricity is stopped, the conductor heat is stopped and the internal temperature of the cable begins to decrease, especially in the extreme local underground cable or submarine cable.
  • 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 generation of deoiled voids in which the insulation oil is not present in the insulation layer is suppressed, and thus the electric field concentrated in the pores is prevented.
  • a power cable that can prolong its life by effectively suppressing partial discharge, insulation breakdown, and the like.
  • An object of the present invention is to provide a power cable in which the insulation strength of the insulation layer is high, and the electric field applied to the insulation layer is effectively alleviated to extend the life.
  • the present invention suppresses the occurrence of deoiled voids in which the insulating oil does not exist in the insulating layer by shrinking the insulating oil in a low temperature environment or when energization is turned off, thereby effectively preventing partial discharge, insulation breakdown, etc. due to the electric field concentrated in the voids. It is an object to provide a power cable that can be suppressed.
  • the lower layer is formed by a transverse winding of a metal tape made of metallized paper or a metal material on which a semiconducting battery is stacked on a metal foil
  • the upper layer is formed by a transverse winding of a semiconducting battery.
  • the lower layer provides a power cable, characterized in that the metallized paper or the metal tape being rolled up by being rolled up by a wrap wound so as to overlap with each other (part).
  • the power cable characterized in that the overlap ratio of 20 to 80% of the ratio of the width overlapping each other to the width of the metallized paper or the metal tape is rolled by the wrap winding provides a power cable.
  • the lower layer is formed by being rolled up by the gap winding rolled up with a certain gap (gap) so that the metallized paper or the metal tape to be rolled up does not overlap with each other in the same layer, providing a power cable do.
  • the width of the gap (gap) provides a power cable, characterized in that 5 to 15% of the width of the metallized paper or the metal tape is transversely wound by the gap winding.
  • the metal foil or the metal tape includes copper or aluminum, and provides a power cable, characterized in that hardened.
  • the semiconductor battery provides a power cable, characterized in that it comprises a carbon paper coated with carbon black on insulating paper.
  • the lower layer is formed by winding one to four sheets of the metallized paper or the metal tape
  • the upper layer is formed by four to eight sheets of the semiconducting batteries, and the total thickness of the inner semiconducting layer is about 0.2 to 3.0 mm. It is characterized by providing a power cable.
  • the outer semiconducting layer provides a power cable, characterized in that it comprises a lower layer formed by the transverse winding of the semiconducting battery and an upper layer formed by the empty winding where the semiconducting battery and the metallization paper are alternately transversely wound.
  • the outer semiconducting layer further provides a power cable, characterized in that it further comprises a top layer by a copper wire direct fabric in which at least one copper wire is directly incorporated into the nonwoven fabric.
  • the insulating layer is formed by sequentially stacking an inner insulating layer, an intermediate insulating layer, and an outer insulating layer, and the inner insulating layer and the outer insulating layer are each formed of kraft paper impregnated with insulating oil.
  • the insulating layer is formed of a semi-synthetic paper impregnated with an insulating oil, the semi-synthetic paper includes a plastic film and kraft paper laminated on at least one side of the plastic film, based on the total thickness of the insulating layer, 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%, the resistivity of the inner insulating layer and the outer insulating layer is less than the resistivity of the intermediate insulating layer It is characterized by providing a power cable.
  • 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 insulating oil provides a power cable, characterized in that the kinematic viscosity of 60 °C more than 5 centistokes (Cst).
  • the power cable according to the present invention has an excellent effect of improving the insulation strength by the insulating layer and the semiconducting layer having a specific structure, and at the same time, the electric field applied to the insulating layer is effectively alleviated to extend the life of the cable.
  • the insulation oil in the insulation layer is expanded during the energization of the cable to move to the gap between the conductors to suppress the occurrence of deoiling voids in the insulation layer by It shows an excellent effect of effectively suppressing partial discharge, insulation breakdown and the like caused by an electric field concentrated in the oil-free space.
  • Figure 1 schematically shows the cross-sectional structure of one embodiment of a power cable according to the present invention.
  • FIG. 2 schematically illustrates a longitudinal cross-sectional structure of the power cable shown in FIG. 1.
  • Figure 3 shows a graph schematically showing the process of relaxation of the electric field in the insulating layer of the power cable according to the present invention.
  • FIG. 4 schematically illustrates a cross-sectional structure of a semisynthetic paper forming an intermediate insulation layer of the power cable shown in FIG. 1.
  • FIG. 1 and 2 schematically show 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. Since the conductor 100 made of a flat conductor formed by a so-called keystone method has a high conductor area ratio, it is possible to reduce the outer diameter of the cable and to form a large cross-sectional area of each element wire. It is economical to reduce. 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 include lower layers 210 and 210 'stacked directly on the conductor and upper layers 220 and 220' stacked on the lower layers 210 and 210 '.
  • the lower layers 210 and 210 ' may be formed of a metallized paper 211 on which a semi-conductrive paper 211b is laminated on a metal foil 211a made of an electrically conductive metal material such as copper or aluminum, or electrically conductive such as copper or aluminum. It may be formed by the side wound of a metal tape (hereinafter, referred to as 'metallization paper 211, etc.') made of a metal material, and the upper layers 220 and 220 may be formed by the side wound of the semiconductor battery.
  • a metal tape hereinafter, referred to as 'metallization paper 211, etc.'
  • the semiconducting battery included in the lower layers 210 and 210 'and the upper layers 220 and 220' may be formed of a carbon paper coated with a conductive material such as carbon black on insulating paper, or a film formed from a polymer composite material in which conductive materials such as carbon black are dispersed. It may include, and the metal foil (211a) or the metal tape is hardened by the tensile strength is improved can be easily traversed by a conventional paper winding machine.
  • the power cable according to the present invention is the structure of the semi-conducting layer 200, in particular, the insulating oil between the conductor 100 and the insulating layer 300 through the semi-conductive layer 200 by the metallized paper 211 or the like.
  • the viscosity of the insulating oil impregnated in the insulating layer 300 is lowered and the fluidity is increased due to the temperature increase when the cable is energized, so that the inside of the conductor 100 through the semiconducting layer 200 is increased.
  • the electric current of the cable is stopped and the temperature is lowered, so that the insulating oil impregnated in the insulating layer 300 contracts, thereby effectively suppressing the generation of a deoiling void in which no insulating oil is present in the insulating layer 300.
  • W is effective to suppress the deformation of the structure that the insulating layer (300).
  • the lower layer 210 has a constant gap so that the metallized paper 211, which is horizontally wound, does not overlap with each other in the same layer.
  • the wrap winding is rolled up by the gap winding being rolled up, or as shown in the enlarged cross-sectional view B of FIG. 2, the lower layer 210 'is rolled up so that the metallized paper 211 etc. being rolled up overlap with each other. Can be stomped by.
  • the gap winding is transversely wound so that a predetermined gap is formed between the metallization paper 211 and the like, and the gap is formed on the upper portion of the metallization paper 211 or the like.
  • rolled up it means that it is covered by the new metallized paper 211 or the like and at the same time it is rolled up in a repeating manner so that it is also rolled so that a gap is formed between the new metallized paper 211 and the like.
  • the wrap winding is more advantageous than the gap winding from the viewpoint of blocking the movement of the insulating oil through the semiconducting layer 200, and improves the productivity of the cable through the improvement of the lateral winding efficiency and the metallization paper, the semiconducting battery, etc. when the cable is bent.
  • the gap winding may be advantageous to the wrap winding from the viewpoint of preventing damage or structural change due to a collision.
  • the metal foil 211a is disposed toward the conductor 100 when the metallized paper 211 is a gap winding or a wrap winding, and the metallized paper being rolled up in the same layer when the metallized paper 211 or the like is gap wound.
  • the gap between the 211 and the like may be 5 to 15% of the width of the metallized paper 211, and the like, and when the metallized paper 211 is wrapped, the gap is a ratio of the widths overlapping each other.
  • the overlap rate may be about 20-80%.
  • the metallization paper 211 when the gap is less than 5%, the metallization paper 211, which is transversely wound on the same layer inside the bending radius when the cable is bent, may collide with each other and be damaged, whereas when the gap is greater than 15%, When bending, the metallized paper 211, etc., transversely wound outside the layer through the gap between the metallized paper 211, etc., transversely wound on its upper layer, and again when the cable is bent. The metallized paper 211 may not be returned to its original layer or may be damaged or its structure may be changed.
  • the layer of the metallization paper 211 is rolled in the overlapped portion of the metallization paper 211, such as when the cable repeats bending and bending This can lead to failure to return to the original layer and damage or restructure.
  • the lower layers 210 and 210 ′ may be formed by transversing one to four sheets of the metallized paper 211, and the upper layers 220 and 220 ′ may be formed by transversing four to eight sheets of the semiconducting batteries.
  • the overall thickness of the inner semiconducting layer 200 may be about 0.2 to 3.0 mm.
  • 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.
  • 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.
  • Figure 3 shows a graph schematically showing the process of relaxation of the electric field in the insulating layer of the 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, so that they are 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 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 the maximum 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 of the intermediate insulation layer 320 is maximized.
  • the entire insulation layer 300 can be made compact, the deterioration can be suppressed, and the insulation strength and other physical properties of the insulation layer 300 can be suppressed from being lowered.
  • the impulse withstand voltage is higher than that of the cable. Not only can it be done with a cable, but it can also suppress the shortening of the cable life.
  • 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 formed by transversely winding a semi-synthetic paper having kraft paper laminated on the surface, the back surface, or both of the plastic film and impregnating insulating oil.
  • the intermediate insulating layer 320 formed as described above has a higher resistivity, lower dielectric constant, higher DC dielectric strength, and impulse breakdown voltage than the inner insulating layer 310 and the outer insulating layer 330 because it includes a plastic film. Due to the high resistivity of the intermediate insulating layer 320, a direct current field is concentrated on the intermediate insulating layer 320 resistant to the DC electric field strength, and an impulse electric field is applied to the intermediate insulating layer 320 resistant to the impulse electric field at a low dielectric constant. By concentrating, the insulating layer 300 as a whole can be made compact, and as a result, the outer diameter of the cable can be reduced.
  • the plastic film is expanded by heat generation during operation of the cable to increase the oil resistance
  • the insulating oil impregnated in the insulating layer 300 is the outer semiconducting layer 400 It is possible to suppress the movement toward the side) to suppress the production of deoiled voids due to the movement of the insulating oil, and consequently to suppress electric field concentration and dielectric breakdown caused by the deoiled voids.
  • 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, so that the outer diameter of the cable may be increased. Difficulties can be made difficult due to lack of distribution of insulating oil, which can 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 1 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 having a high resistivity of 75% or more it is possible to reduce the cable outer diameter while maintaining a sufficient dielectric strength.
  • 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 direct current and the impulse electric field applied to the insulating layer 300 can be most effectively designed on the electric field, and the high electric field of the direct current and the impulse is directly above the conductor 100 and directly below the metal sheath layer 500. It is possible to apply design means that can raise the dielectric strength of the cable connection member, which is particularly susceptible to electric fields, to a sufficient height.
  • 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 0.1 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
  • the thickness of the internal insulating layer 310 is preferably 1 to 30 times.
  • 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 150 ⁇ m.
  • the thickness of the kraft paper forming the inner and outer insulating layers 310 and 320 may be greater than the thickness of the kraft paper constituting the semi-synthetic paper.
  • 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 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.
  • 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 reinforcing 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 Increasing the hydraulic pressure of (300) and, on the contrary, compensates for the lowering of the hydraulic pressure due to shrinkage of the insulating oil due to the temperature drop when the cable is turned off, and the hydraulic pressure is rapidly increased as in the inner semiconducting layer 200 in the high hydraulic pressure portion. It is desirable to have the effect of replenishing the oil by moving the oil to the down portion.
  • 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 la transmission de courant longue distance. Plus précisément, la présente invention concerne un câble d'alimentation pourvu d'une couche d'isolation présentant en elle-même une résistance diélectrique élevée, qui permet une atténuation efficace d'un champ électrique appliqué à la couche d'isolation, et plus particulièrement, qui empêche la production, dans la couche d'isolation, etc., d'un vide déshuilé qui ne contient pas d'huile isolante, empêchant ainsi efficacement une décharge partielle, une rupture diélectrique, etc. engendrées par un champ électrique concentré au niveau du vide, et permettant ainsi de prolonger la durée de vie du câble d'alimentation.
PCT/KR2017/003526 2017-03-30 2017-03-30 Câble d'alimentation Ceased WO2018182070A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/KR2017/003526 WO2018182070A1 (fr) 2017-03-30 2017-03-30 Câble d'alimentation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/KR2017/003526 WO2018182070A1 (fr) 2017-03-30 2017-03-30 Câble d'alimentation

Publications (1)

Publication Number Publication Date
WO2018182070A1 true WO2018182070A1 (fr) 2018-10-04

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Country Link
WO (1) WO2018182070A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20040038180A (ko) * 2002-10-31 2004-05-08 한국전력공사 수분침투 억제용 지중 전력케이블
JP2014241209A (ja) * 2013-06-11 2014-12-25 日立金属株式会社 ケーブルおよびその接続構造
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
KR20160101643A (ko) * 2015-02-17 2016-08-25 엘에스전선 주식회사 전력 케이블
KR20160121873A (ko) * 2015-04-13 2016-10-21 엘에스전선 주식회사 전력 케이블

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20040038180A (ko) * 2002-10-31 2004-05-08 한국전력공사 수분침투 억제용 지중 전력케이블
JP2014241209A (ja) * 2013-06-11 2014-12-25 日立金属株式会社 ケーブルおよびその接続構造
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
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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