WO2018236013A1 - Câble d'alimentation en courant continu - Google Patents

Câble d'alimentation en courant continu Download PDF

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Publication number
WO2018236013A1
WO2018236013A1 PCT/KR2017/014344 KR2017014344W WO2018236013A1 WO 2018236013 A1 WO2018236013 A1 WO 2018236013A1 KR 2017014344 W KR2017014344 W KR 2017014344W WO 2018236013 A1 WO2018236013 A1 WO 2018236013A1
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WO
WIPO (PCT)
Prior art keywords
insulating
electric field
resin
weight
parts
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PCT/KR2017/014344
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English (en)
Korean (ko)
Inventor
정현정
남진호
남기준
조영은
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.)
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Priority claimed from KR1020170151398A external-priority patent/KR102272724B1/ko
Application filed by 엘에스전선 주식회사 filed Critical 엘에스전선 주식회사
Priority to US16/623,700 priority Critical patent/US20200143960A1/en
Priority to CN201780091731.3A priority patent/CN110709948B/zh
Priority to EP17915096.6A priority patent/EP3644327A4/fr
Priority to JP2019559774A priority patent/JP2020518971A/ja
Publication of WO2018236013A1 publication Critical patent/WO2018236013A1/fr
Priority to JP2021199411A priority patent/JP2022037067A/ja

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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
    • H01B1/20—Conductive material dispersed in non-conductive organic material
    • 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
    • H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
    • H01B3/10—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances metallic oxides
    • 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
    • H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
    • H01B3/12—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances ceramics
    • 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 DC power: cables. Specifically. Disclosed are a direct current (DC) capacitor capable of simultaneously preventing a decrease in direct current insulation resistance due to space charge accumulation and a reduction in impulse breakdown strength, Power cable.
  • DC direct current
  • the power transmission system can be divided into AC transmission system and DC transmission system, and DC transmission system refers to the transmission of electric energy to DC.
  • DC transmission system refers to the transmission of electric energy to DC.
  • the AC power of the transmission side is changed to an appropriate voltage, converted into a DC by a net converting device, and then sent to a power receiving side through a transmission line.
  • DC power is converted back to AC power by an inverse converter.
  • the DC transmission method is advantageous for long-distance transportation of a large amount of electric power and is capable of interconnection of an asynchronous electric power system, and is widely used because it has less power loss and stability than DC in long-distance transmission It is true.
  • the insulation characteristic of the insulator is remarkably lowered when the temperature of the cable transducer rises or when the negative polarity or the polarity reversal occurs when the transmission is progressed using the high voltage DC transmission cable , which is known to be due to the accumulation of long-life space charge without trapping or discharging a single charge in the insulator.
  • the space charge described above can distort the electric field within the high-voltage DC transmission cable insulator and cause dielectric breakdown at a voltage lower than the initially designed breakdown voltage.
  • aluminum silicate is added to the insulating base resin constituting the insulating layer of the cable.
  • a technique of adding inorganic particles such as calcium silicate, calcium carbonate, and magnesium oxide has been used.
  • the above-mentioned space charge accumulation is inevitably generated by the crosslinking of the charge injected into the insulating layer from the conductor of the cable, the crosslinking by-product which is inevitably generated by the crosslinking of the insulating layer, and the semiconductive layer in contact with the insulating layer A crosslinking byproduct carried into the insulating layer, a polar monomer contained in the base resin forming the semiconductive layer and transferred into the insulating layer, and the like. Therefore, simply by adding the inorganic particles to the insulating layer The space charge accumulation and thus the problem of the direct current dielectric strength and the destruction voltage can not be sufficiently solved.
  • the inorganic particles act as impurities to reduce the extrudability of the insulating layer.
  • IMPORTANT FEATURES There is a problem of lowering the degree. Due to such a problem, the thickness of the insulation layer in the DC power cable is determined by the impulse strength rather than the breakdown voltage of the cable, which increases the outer diameter of the cable, which is a problem in terms of manufacturing and economics. In addition, the thickness of the insulation layer of the DC power cable is determined by the bridging breakdown voltage and the impulsive strength of the cable, which increases the outer diameter of the cable, which is a problem in terms of manufacturing and economics.
  • the present invention aims to provide a DC power cable capable of reducing the manufacturing cost without deteriorating the extrudability of the flaky layer or the like.
  • a direct current power cable comprising: a conductor; An inner semiconductive layer surrounding the conductor; An insulating layer surrounding the inner semiconductive layer; An outer semiconductive layer surrounding the insulating layer; And the outer half Wherein the inner semiconductive layer or the outer semiconductive layer is formed from a semiconductive composition comprising a copolymer resin of an olefin and a polar monomer as a base resin and conductive particles dispersed in the resin, Based on the total weight of the copolymer resin, is 18% or less by weight based on the total weight of the copolymer resin, and the insulating layer is composed of a poly resin as a base resin and a resin selected from the group consisting of aluminosilicate, calcium silicate, calcium carbonate, magnesium oxide, carbon Nanotubes and graphite, wherein the content of the non-dopant is 0: 01 to 10 parts by weight based on 100 parts by weight of the base resin of the insulating layer (F ield Enhancement Factor: E ⁇
  • FEF (maximum applied electric field in specimen / electric field applied to specimen) * 100
  • the sample is an insulating film formed from an insulating composition having a thickness of 120 and forming the insulating layer, and a semi-conductive film formed from the semi-conductive composition, each of which is bonded to the upper and lower surfaces of the insulating film, Including the specimen,
  • the electric field applied to the specimen was a 50 kV / ivil direct electric field applied to the insulating film for 1 hour,
  • the electric field which is maximally increased in the specimen is applied to the insulation film by a DC electric field Is the maximum value among the electric field values increased for one hour.
  • the insulating composition or the semi-conductive composition further comprises a crosslinking agent.
  • the content of the crosslinking agent is 0.1 to 5 parts by weight based on 100 parts by weight of the base resin.
  • the polar monomer comprises an acrylate monomer.
  • the inorganic filler comprises an oxide magnet.
  • the inorganic filler is surface-modified with at least one surface modifier selected from the group consisting of vinylsilane, stearic acid, oleic acid, and aminopolysiloxane.
  • the copolymer resin can be selected from the group consisting of ethylene vinyl acetate (EVA), ethylene methyl acrylate (EMA), ethylene methyl methacrylate (EMMA), ethylene ethyl acrylate (EEA), ethylene ethyl methacrylate (EE A) (1) selected from the group consisting of ethylene (iso) propyl acrylate (EPA), ethylene (iso) propyl methacrylate (EPA), ethylene butyl acrylate (EBA) and ethylene butyl methacrylate
  • the content of the conductive particles is 35 to 70 parts by weight based on the weight of the base resin 100.
  • the cross-linking agent is a peroxide-based cross-linking agent.
  • the peroxide-based crosslinking agent may be at least one selected from the group consisting of dicumyl peroxide, benzoyl peroxide, lauryl peroxide, t -butyl cumyl peroxide, di ( t -butylperoxyisopropyl) benzene, 2,5-dimethyl- (? -Butylperoxy) nucleic acid and di-t-butyl peroxide.
  • the present invention relates to a direct current power cable,
  • the present invention also provides a direct current power cable, wherein the polyolefin resin as the base resin of the insulating layer comprises a polyarylene resin.
  • the insulating composition can be prepared by reacting 2,4-diphenyl-4-methyl-1-pentene, 1,4-hydroquinone, And a hydroquinone derivative, wherein the content of the scorch retarder is 0.1 to 1.0 part by weight based on 100 parts by weight of the base resin .
  • scorch retarder comprises 2,4-diphenyl-4-methyl-1-pentene.
  • the direct current power cable according to the present invention precisely controls the base resin and the degree of crosslinking of the semiconductive layer and also adds a precisely controlled amount of inorganic particles to the inside of the insulating layer, And the deterioration of the impulsive fracture strength can be prevented in the verb.
  • the present invention reduces the amount of inorganic particles contained in the after-treatment layer to suppress the accumulation of space charge, thereby suppressing the deterioration of the extrudability of the insulating layer or the like caused by the inorganic particles And further, it is possible to suppress the increase in the thickness of the insulating layer and to reduce the manufacturing cost of the cable.
  • Figure 1 schematically illustrates a cross-sectional structure of an embodiment of a power cable according to the present invention.
  • FIG. 2 schematically shows a cross-sectional structure of another embodiment of a power cable according to the present invention.
  • FIG. 3 is a graph showing the volume resistivity of the insulating specimen according to the temperature in the embodiment.
  • Fig. 4 shows FT-IR evaluation results for an insulation + semi-conductive sample in the embodiment.
  • Figure 5 shows the PEA evaluation results for an insulating + semi-conducting sample in the example.
  • a DC power cable 100 includes an inner semiconductive layer 12 surrounding a conductor 10, a conductor 10 surrounding the inner semiconductive layer 12, A shield layer 18 covering the outer semiconductive layer 16 and covering the outer semiconductive layer 16 and made of metal sheath or neutral wire to provide an electrical shielding and short circuit current return path, A cover 20 surrounding the layer 18, and the like.
  • FIG. 2 is a schematic cross-sectional view of a DC power cable according to another embodiment of the present invention, schematically showing a cross-sectional structure of a submarine cable.
  • the DC power cable 200 includes the conductor 10, the inner semiconductive layer 12, the insulating layer 14, and the outer semiconductive layer 16, Since it is similar to the actual example, repetitive I description is omitted.
  • a metal sheath made of lead is used to prevent the insulation performance of the insulation layer 14 from being deteriorated if foreign substances such as external water enter the outer semiconductive layer 16. Called i 'soft serve' (30).
  • a sheath 32 made of a resin such as polyethylene or the like is provided on the outside of the soft tissue 30, and a bed layer 34 is provided so as not to be in direct contact with water.
  • a wire sheath 40 may be provided on the bedding layer 34. The wire sheath 40 is provided on the outer side of the cable so as to enhance the mechanical strength to protect the cable from the external environment of the seabed.
  • the jacket 42 is provided on the outer side of the cable to protect the inner structure of the cable 200.
  • the core 42 has excellent weather resistance and mechanical strength that can withstand undersea environments such as seawater.
  • the jacket 42 may be made of polypropylene yarn or the like.
  • the center conductor 10 may be formed of a single wire made of copper, aluminum, preferably copper, or a twisted wire associated with a plurality of wires, and the diameter of the center conductor 10, the diameter of the wire constituting the twisted wire, Can be different depending on the transmission voltage, the use, etc. of the DC power cable including the DC power cable, and can be suitably selected by a person skilled in the art.
  • the center conductor 10 is preferably formed by twisted wire having excellent flexibility rather than disconnection.
  • the inner semiconductive layer 12 is disposed between the center conductor 10 and the insulating layer 14 to remove the air layer inducing interlayer delamination between the center conductor 10 and the insulating layer 14 , Mitigate local electric field concentration, and so on.
  • the outer semiconductive layer 16 functions to uniformly apply an electric field to the insulating layer 14, to localize local field concentration, and to protect the cable insulation layer from the outside. Normal.
  • the inner semiconductive layer 12 and the outer semiconductive layer 16 are formed by dispersing conductive particles such as carbon black, carbon nanotubes, carbon nanoplate, and graphite in a base resin and further adding a crosslinking agent, an antioxidant, Is formed by the extrusion of the added semi-conductive composition.
  • the base resin uses a series of olefin resins similar to the base resin of the insulating composition forming the insulating layer 14 for adhesion between the semiconductive layers 12 and 16 and the insulating layer 14 Olefin and a polar monomer such as ethylene vinyl acetate (EVA), ethylene methyl acrylate (EMA), and the like are more preferably used in consideration of compatibility with the conductive particles.
  • a polar monomer such as ethylene vinyl acetate (EVA), ethylene methyl acrylate (EMA), and the like are more preferably used in consideration of compatibility with the conductive particles.
  • EMMA ethylene ethyl acrylate
  • EEMA ethylene ethyl methacrylate
  • EPA ethylene ethyl methacrylate
  • EBA Ethylene butyl acrylate
  • EBMA ethylene butyl methacrylate
  • the cross-linking agent may be a silane-based cross-linking agent or dicumylperoxide benzoyl peroxide, lauryl peroxide, t-butyl cumyl peroxide, di ( butylperoxy) benzene, 2,5-dimethyl-2,5-di (t-butylperoxy) nucleic acid, di-t-butyl peroxide and the like.
  • a copolymer resin of an olefin and a polar monomer and / or a polar monomer is contained in the semiconductive layer 12
  • the charge accumulation of space in the permeable layer 14 is further increased by moving to the inside of the insulating layer 14 through the interface of the layer 14 and the crosslinked byproducts 12, Is transferred into the insulating layer 14 through the interface between the semiconductive layer 12 and the insulating layer 14 so as to accumulate heterocharges in the insulating layer 14, By abstaining The dielectric breakdown voltage of the insulating layer 14 may be lowered.
  • the semiconductive composition for forming the semiconductive layer 12 has a content of the notarization resin of the olefin and the polar monomer of about 60 to 70 wt.
  • the content of the polar monomer may be controlled to 1 to 18% by weight, preferably 1 to 12% by weight, based on the total weight of the copolymer resin.
  • the space charge accumulation of the insulating layer 14 is significantly accelerated.
  • the content of the polar monomer is less than 1% by weight, The extrudability of the semiconductive layers 12 and 16 is lowered and the semiconducting properties may not be realized.
  • the semi-conductive composition for forming the semiconductive layer 12 may contain 0.1 to 5 parts by weight, preferably 0.1 to 1.5 parts by weight, based on 100 parts by weight of the base resin, Can be precisely controlled.
  • the content of the crosslinking agent is more than 5 parts by weight, the content of the crosslinking by-products which are essential in the crosslinking of the base resin contained in the semi-conductive composition is excessive, and the crosslinking by- A problem that the dielectric breakdown voltage of the insulating layer 14 is lowered by increasing the distortion of the electric field by moving into the insulating layer 14 through the interface between the insulating layers 14 and accumulating heterocharges
  • the mechanical properties and heat resistance of the semiconductive layers 12 and 16 may be insufficient due to the non-crosslinked degree of crosslinking.
  • the semi-conductive composition for forming the inner and outer semi-conductive layers (12, 14) contains 35 to 70 parts by weight of conductive particles such as carbon black based on 100 parts by weight of the base resin .
  • the content of the conductive particles is less than 35 parts by weight, the layered semiconducting property can not be realized.
  • the amount of the conductive particles exceeds 70 parts by weight, the extrudability of the inner and outer semiconductive layers 12 and 14 is lowered, There is a problem that the productivity of the cable is deteriorated.
  • the insulating layer 14 is made of polyethylene, for example, as a base resin .
  • a polyolefin resin such as polypropylene, and may be formed by extrusion of an insulating composition preferably comprising a polyethylene resin and inorganic particles.
  • the polyethylene resin may be an ultra low density polyethylene (ULDPE), a low density polyethylene (LDPE), a linear low density polyethylene (LLDPE), a medium density polyethylene (MDPE), a high density polyethylene (HDPE), or a combination thereof.
  • the polyethylene resin may be a single polymer, a random or block copolymer of ethylene and an ⁇ -olefin such as propylene, 1-butene, 1-pentene, 1-nuchene or 1-octene, or a combination thereof have.
  • the inorganic particles include nano-sized aluminum silicate, calcium silicate, calcium carbonate, magnesium oxide. Carbon nanotubes, graphite, or the like can be used. However, in view of the impulse strength of the insulating layer 14, magnesium oxide is preferable as the inorganic particles.
  • the oxidized magenet can be obtained from natural ore but can also be prepared from phosphorus synthetic materials using magnesium salt in seawater, and it is also possible to supply the material with high purity and stable quality and physical properties.
  • the magnesium oxide has a crystal structure of a face-centered cubic structure, Depending on the method, it can have various forms, purity, crystallinity, physical properties and the like. Specifically, the magnesium oxide is divided into cubic, terrace, rod, porous, and spherical calc, and can be variously used depending on their specific physical properties. By forming a potential well at the boundary between the base resin and the inorganic particles, the charge transfer and the accumulation of space charge can be suppressed.
  • the nanocarbon particles and carbon nanotubes including the graphite may have various shapes, and space charges generated in the ultra-high voltage DC transmission cable can be removed while maintaining insulation performance, and high voltage direct current It is possible to minimize the drop in the insulation voltage which causes insulation breakdown at a voltage lower than the breakdown voltage initially designed for the transmission cable insulation.
  • the partially carbonized graphene nanofibers are not electrically connected to each other by the remaining PAN structure, so that they are insulated. However, since some graphite structure sufficiently polarizes by an external electric field, space charge is removed It can serve as a trap site.
  • Such inorganic particles including magnesium oxide exhibit an effect of suppressing charge transfer and space charge accumulation by forming a potential well (potent alloy) at the interface between the base resin and the inorganic particles when an electric field is applied to the cable.
  • the dielectric constant of the inorganic particles is generally larger than that of the base resin.
  • the dielectric constant of magnesium oxide as the inorganic nanoparticles is about 10
  • the dielectric constant of low density polyethylene (LDPE) as the base resin is about 2.2 to 2.3. therefore.
  • the inorganic nanoparticles are added to the base resin.
  • the dielectric constant of the base resin should be higher than that of the base resin.
  • the dielectric constant of the insulating composition may be lower than that of the base It is experimentally confirmed that the phenomenon of reducing the dielectric constant of the resin occurs and the impulse breakdown voltage is also increased.
  • the reason why the dielectric constant of the insulating composition is lower than the dielectric constant of the base resin is unknown, but is predicted as a result of the so-called nanoffect, It is predicted that the size of the inorganic particles is controlled by the nanoscale, thereby stabilizing the interface inside the base resin.
  • the size of the inorganic particles is controlled to be nanoscale, the dielectric constant of the insulating composition containing the inorganic particles is reduced, and the impurity breakdown voltage of the insulating layer formed from the insulating composition is too small, An effect of prolonging the life span may be caused.
  • the dielectric constant of the insulating composition according to the present invention may be 1% or more, preferably 2% or more, and more preferably 5% or more, of the dielectric constant reduction rate (%) defined by the following equation (1).
  • the inorganic nanoparticles may have a shape such as a terrace, a cubic, a rod, an edge-less, and the like. In view of the interface stability within the base resin, A cubic shape is preferable.
  • the inorganic particles including the oxidized magnet are surface-modified with vinylsilane, stearic acid, oleic acid, aminopolysiloxane, and the like.
  • inorganic particles such as magnesium oxide are hydrophilic with high surface energy
  • base resins such as polyethylene are hydrophobic with low surface energy, so that inorganic particles of magnesium oxide are dispersed in a base resin such as polyethylene The dispersibility is not good. Electrical properties can also be detrimental.
  • the it to surface modification of inorganic particles such as wet oxidation magnesite is preferred to solve this problem.
  • inorganic particles such as a magnesium oxide
  • inorganic particles and poly Sikkim between the base resin of ethylene round (gap) blossomed degrade the mechanical properties, as well as the dielectric breakdown?
  • the electrical insulation properties such as strength may be lowered.
  • inorganic particles such as magnesium oxide are surface-modified with vinylsilane or the like, they show better dispersibility with respect to base resins such as polyethylene and exhibit improved electrical properties.
  • a hydrolyzate such as vinylsilane is chemically bonded to the surface of magnesium oxide or the like by the condensation reaction to form a surface-modified inorganic particle.
  • the silane group of the inorganic particles surface-modified with the vinyl silane or the like can counteract the base resin such as polyethylene, thereby ensuring excellent dispersibility.
  • the inorganic particles such as magnesium oxide may have a single crystal or polycrystal form and may be included in the insulating composition in an amount of 0.01 to 10 parts by weight based on 100 parts by weight of the base resin. If the content of the inorganic particles is less than 0.01 part by weight, the effect of reducing the space charge accumulation can be divided into a plurality of layers, and if the content is more than 10 parts by weight, the impulse strength, mechanical properties and continuous extrudability can be deteriorated.
  • the insulating layer 14 can be made of a crosslinked polyolefin (XLPO) by extrusion or by a separate crosslinking process after extrusion.
  • XLPE crosslinked polyethylene
  • the cross-linking agent included in the insulating composition may be the same as the cross-linking agent included in the semi-conductive composition.
  • the cross-linking agent may be a silane-based cross-linking agent or a dicumylperoxide, benzoyl peroxide, Di (t-butylperoxy) benzene, 2,5-dimethyl-2,5-di (t-butylperoxy) Based cross-linking agent.
  • the crosslinking agent contained in the insulating composition may be included in an amount of 0.1 to 5 parts by weight based on 100 parts by weight of the base resin.
  • the insulating composition may further include other additives such as an antioxidant, a heat resistant extrudability improving agent, a scavenger, a scorch inhibitor, and a crosslinking assistant.
  • additives such as an antioxidant, a heat resistant extrudability improving agent, a scavenger, a scorch inhibitor, and a crosslinking assistant.
  • An amine antioxidant as the antioxidant; Thioester-based antioxidants such as dialkyl esters, distearyl thiodipropionate, and dilauryl thiodipropionate; (2, 4-di-t-butylphenyl) 4,4'-biphenylene diphosphite, 2'2'-thiodiethylbis- [3- 4-hydroxyphenyl) -propionate], pentaerythrityl- (4-hydroxyphenyl) propionate], 4,4'-thiobis (2-methyl-6-t-butylphenol), tetrakis- [3- Bis (3-t-butyl-4-hydroxy-5-methylphenyl) propionate] ), And mixtures thereof.
  • the antioxidant may be used in an amount of 0.1 to 2 parts by weight based on 100 parts by weight of the base resin.
  • the heat resisting agent there may be mentioned diphenylamine and acetone compound, zinc 2-mercaptobenzimidazoate, 4,4'-bis ( ⁇ , ⁇ -dimethylbenzyl) diphenylamine, pentaerythritol- Pentaerythritol-tetrakis- (beta -lauryl-ciopropionate, 2, 3-di-tert- butyl-4-hydroxy- (3,5-ditert.butyl-4-hydroxyphenyl) -propionate], distearyl-esters of ⁇ , ⁇ '-cyodipropionic acid, and 2'-cyanoethylene bis [3- , Wherein the heat resisting agent may be used in an amount of 0.1 to 2 parts by weight based on the weight of the base resin.
  • an aryl-based silane or the like may be used as the ion scavenger.
  • the ion scavenger may be used in an amount of 0.1 to 2 parts by weight based on 100 parts by weight of the base resin, .
  • the scorch retarder enhances the crosslinking efficiency of the cross-linking agent and improves the scorch resistance resistance.
  • 2,4-diphenyl-4-methyl- (1-methyl-1-pentene), 1,4-hydroquinone, and hydroquinone derivatives can be used.
  • the content of the scorch retarder may be 0.1 to 1.0 parts by weight, preferably 0.2 to 0.8 parts by weight based on 100 parts by weight of the base resin. When the content of the scorch retarder is less than 0.1 part by weight, the effect of accelerating the crosslinking is small. When the content of the scorch retarder is more than 1.0 part by weight, the crosslinking efficiency is decreased.
  • the inventors of the present invention have found that, in the DC power cable according to the present invention, the electric field applied to the insulating layer 14 by the accumulation of space charge in the insulating layer 14 is distorted, The designed DC insulation breakdown voltage and insulation breakdown voltage of the cable can be maintained at the same level when the electric field enhancement factor (FEF) of the insulation layer 14 defined by Equation 2 is 100 to 140% The present invention has been completed.
  • FEF electric field enhancement factor
  • FEF (maximum applied electric field in specimen / electric field applied to specimen) * 100
  • the specimen comprises an insulating film formed from an insulating composition having a thickness of 120 and forming the insulating layer, and a semi-conductive film formed from the semi-conductive composition, each of which is bonded to an upper surface and a lower surface of the insulating film, and,
  • the electric field applied to the specimen was a 50 kV / mm direct electric field applied to the insulating film for 1 hour,
  • the electric field which is maximally increased in the specimen is applied to the insulation film by a DC electric field Is the maximum increase of the electric field value for 1 hour.
  • the inventors of the present invention have found that the space charge accumulation in the insulating layer 14 is excessively distorted and the electric field is largely distorted, And that the dielectric breakdown voltage is rapidly lowered.
  • the electric field distortion of the insulating layer 14 can be precisely controlled.
  • the jacket layer 20 may include polyethylene, polyvinyl chloride, polyurethane, and the like.
  • the jacket layer 20 may be formed of a polyethylene resin. Since the jacket layer 20 is disposed at the outermost portion of the cable, And more preferably made of a high-density polyethylene (HDPE) resin.
  • the jacket layer 20 may contain a small amount of additives such as carbon black, for example, 2 to 3% by weight to realize the hue of the DC electric power cable.
  • the jacket layer 20 may have a thickness of 0.1 to 8 mm Thickness.
  • the insulating thin film was prepared by thermally compressing an insulating composition comprising magnesium oxide, a peroxide crosslinking agent and other additives surface-treated with vinylsilane as polyethylene resin inorganic particles at 120 ° C for 5 minutes and drying at 180 ° C After stirring for 8 minutes, the mixture was aged at 120 ° C and cooled again at room temperature. The thickness of the fabricated insulating thin film was about 120.
  • the insulation + semi-conductive thin film is obtained by heat-compressing an insulating composition containing polyethylene resin, magnesium oxide surface-treated with vinylsilane as inorganic particles, peroxide crosslinking agent and other additives at 120 ° C for 5 minutes, Conductive composition comprising butyl acrylate (BA), a cross-linking agent, and other additives is heated and pressed at 120 ° C for 5 minutes to form a semi-conductive film, Adhered to the front and back sides of the film and remelted at 120T for 5 minutes to thermally bond with each other, then crosslinked at 18CTC for 8 minutes, then aged at 12CTC, and then cooled at room temperature.
  • the thicknesses of the insulating films and the semi-conductive films produced were about 120 and about 50, respectively.
  • the semi-conductive composition comprises a semi-conductive film formed of a semi-conductive composition (SC-a) having a content of butyl acrylate (BA) of 17% by weight based on the total weight of the resin, A semi-conductive film made of a semi-conductive composition (SC-b) having a content of 3% ≪ / RTI > thin films were prepared.
  • SC-a semi-conductive composition having a content of butyl acrylate (BA) of 17% by weight based on the total weight of the resin
  • BA butyl acrylate
  • the insulation + anti-conducting thin film was obtained by bonding a semi-conductive film to only one side of the insulating film and cutting the cross section into a 1 mm thick microcrome.
  • Each of the insulation thin film, the insulation + semi-conductive (SC-a) thin film and the insulation + semi-conductive (SC-b) thin film was degassed by vacuum and 7 The film was also removed.
  • the insulation compositions A and B of Table 1 below were prepared, respectively.
  • the unit of the content shown in Table 1 below is parts by weight.
  • Inorganic particles Magnesium oxide surface-modified with vinylsilane (average particle diameter: 200 nm)
  • Crosslinking agent Dicumyl peroxide
  • an insulating layer composed of the insulating composition A or B, wherein the semiconductive composition SC -a) to the semi-conductive composition (SC-b) and the outer semiconductive layer, respectively, model cables A to D each having an insulation thickness of 4 mm and a conductor cross-sectional area of 400 sq were prepared.
  • Specific constructions of the inner semiconductive layer, the insulating layer and the outer semiconductive layer of the model cables A to D are shown in Table 2 below.
  • Insulating film and half between the conductive film in order to determine whether or not the implementation of the acrylate and cross-linking by-products over the 64 scans at 4 cm 1 resolution eu 4000 to 650 cm "1 in the spectra l data collected.
  • FT-IR evaluation was performed with a Varian 7000e instrument equipped with a microscope and MCT detector. The evaluation result is as shown in Fig.
  • the specimen (a) trams the charge in which the inorganic particles contained therein move into the film from the electrode. Further, since it is not bonded to the semi-conductive film, crosslinking by-products generated during crosslinking of the semi-conductive film do not migrate toward the insulating thin film film, heterocharging is not formed, and butyl acrylate (BA It was confirmed that the accumulation of the space charge was insignificant in the case of (a) in which the DC electric field was applied and in the case of (b) in which the DC electric field application was interrupted and thus the electric field I distortion degree (FEF) Respectively.
  • BA butyl acrylate
  • the crosslinked byproducts or butyl acrylate (BA) of the antireflective thin film migrate toward the insulating thin film and a hetero electric charge is generated near the interface between the insulating thin film and the semi-
  • the electric field distortion (BA) content of specimen (b) was relatively higher than that of specimen (c) with relatively low content of butylacrylate (BA) (FEF) was also found to be relatively large.
  • an impulse voltage generator was used to measure an impulse breakdown voltage by applying an impulse voltage of 300 kV. Specifically, the impulse breakdown voltage was measured at an initial applied voltage of 300 kV to 20 kV The breakdown voltage was measured at the breakdown of the specimen and the measurement results (breakdown probability 0%) are shown in Table 4 below.
  • the model cable C and the model cable D which do not contain inorganic particles electric field distortion due to the accumulation of space charge is induced in the insulator, and consequently, the impulse breakdown voltage is significantly reduced.
  • model cable A including the inorganic particles in the insulating layer effectively restrains the accumulation of the space charges, and as the temperature increases, the volume resistivity is maintained at the maximum, .
  • Model cables without inorganic particles (:) were found to be highly dependent on temperature due to the rapid decrease in volume resistivity at 70 and 90 ° C due to the accumulation of space charge.

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  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Dispersion Chemistry (AREA)
  • Organic Insulating Materials (AREA)

Abstract

La présente invention concerne un câble d'alimentation en courant continu. En particulier, la présente invention concerne un câble d'alimentation en courant continu permettant d'empêcher simultanément une baisse de résistance diélectrique de courant continu et une baisse de résistance disruptive d'impulsion, qui sont provoquées par une accumulation de charge d'espace, et permettant de réduire les coûts de fabrication sans abaisser l'aptitude à l'extrusion d'une couche isolante, et analogue.
PCT/KR2017/014344 2017-06-22 2017-12-07 Câble d'alimentation en courant continu WO2018236013A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US16/623,700 US20200143960A1 (en) 2017-06-22 2017-12-07 Direct current power cable
CN201780091731.3A CN110709948B (zh) 2017-06-22 2017-12-07 直流电力电缆
EP17915096.6A EP3644327A4 (fr) 2017-06-22 2017-12-07 Câble d'alimentation en courant continu
JP2019559774A JP2020518971A (ja) 2017-06-22 2017-12-07 直流電力ケーブル
JP2021199411A JP2022037067A (ja) 2017-06-22 2021-12-08 直流電力ケーブル

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KR20170078845 2017-06-22
KR10-2017-0078845 2017-06-22
KR1020170151398A KR102272724B1 (ko) 2017-06-22 2017-11-14 직류 전력 케이블
KR10-2017-0151398 2017-11-14

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CN109942933A (zh) * 2019-02-22 2019-06-28 全球能源互联网研究院有限公司 一种抑制空间电荷的直流电缆绝缘料及其制备方法

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KR101318481B1 (ko) * 2012-09-19 2013-10-16 엘에스전선 주식회사 직류 전력 케이블용 절연 조성물 및 이를 이용하여 제조된 직류 전력 케이블
KR101408923B1 (ko) * 2010-06-22 2014-06-17 엘에스전선 주식회사 직류용 전력 케이블용 절연 재료 조성물 및 이를 이용하여 제조된 케이블

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JP2006291022A (ja) * 2005-04-11 2006-10-26 J-Power Systems Corp 絶縁組成物および電線・ケーブル並びに絶縁組成物の製造方法
KR20130043132A (ko) * 2010-03-16 2013-04-29 엘에스전선 주식회사 반도전성 조성물 및 이를 이용한 전력 케이블
KR20130057993A (ko) * 2010-04-14 2013-06-03 보레알리스 아게 유리한 전기적 특성을 갖는 가교결합될 수 있는 중합체 조성물 및 케이블
KR101408923B1 (ko) * 2010-06-22 2014-06-17 엘에스전선 주식회사 직류용 전력 케이블용 절연 재료 조성물 및 이를 이용하여 제조된 케이블
KR101318481B1 (ko) * 2012-09-19 2013-10-16 엘에스전선 주식회사 직류 전력 케이블용 절연 조성물 및 이를 이용하여 제조된 직류 전력 케이블

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109942933A (zh) * 2019-02-22 2019-06-28 全球能源互联网研究院有限公司 一种抑制空间电荷的直流电缆绝缘料及其制备方法

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