WO2011093211A1 - 架橋ポリオレフィン組成物、直流電力ケーブル及び直流電力線路の施工方法 - Google Patents
架橋ポリオレフィン組成物、直流電力ケーブル及び直流電力線路の施工方法 Download PDFInfo
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- WO2011093211A1 WO2011093211A1 PCT/JP2011/051046 JP2011051046W WO2011093211A1 WO 2011093211 A1 WO2011093211 A1 WO 2011093211A1 JP 2011051046 W JP2011051046 W JP 2011051046W WO 2011093211 A1 WO2011093211 A1 WO 2011093211A1
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- power cable
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- 239000000203 mixture Substances 0.000 title claims abstract description 43
- 229920000098 polyolefin Polymers 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title description 15
- 238000010276 construction Methods 0.000 title 1
- 239000006229 carbon black Substances 0.000 claims abstract description 28
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 18
- 150000001451 organic peroxides Chemical class 0.000 claims abstract description 16
- KOMNUTZXSVSERR-UHFFFAOYSA-N 1,3,5-tris(prop-2-enyl)-1,3,5-triazinane-2,4,6-trione Chemical compound C=CCN1C(=O)N(CC=C)C(=O)N(CC=C)C1=O KOMNUTZXSVSERR-UHFFFAOYSA-N 0.000 claims abstract description 13
- MPJPKEMZYOAIRN-UHFFFAOYSA-N 1,3,5-tris(2-methylprop-2-enyl)-1,3,5-triazinane-2,4,6-trione Chemical compound CC(=C)CN1C(=O)N(CC(C)=C)C(=O)N(CC(C)=C)C1=O MPJPKEMZYOAIRN-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000010438 heat treatment Methods 0.000 claims description 11
- 239000011810 insulating material Substances 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 150000001875 compounds Chemical class 0.000 claims description 5
- 238000009413 insulation Methods 0.000 abstract description 6
- 230000006866 deterioration Effects 0.000 abstract description 5
- 238000004132 cross linking Methods 0.000 description 23
- 229920003020 cross-linked polyethylene Polymers 0.000 description 22
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- 230000000052 comparative effect Effects 0.000 description 13
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- XMNIXWIUMCBBBL-UHFFFAOYSA-N 2-(2-phenylpropan-2-ylperoxy)propan-2-ylbenzene Chemical compound C=1C=CC=CC=1C(C)(C)OOC(C)(C)C1=CC=CC=C1 XMNIXWIUMCBBBL-UHFFFAOYSA-N 0.000 description 11
- 230000015556 catabolic process Effects 0.000 description 11
- 238000013329 compounding Methods 0.000 description 10
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 9
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- 239000003963 antioxidant agent Substances 0.000 description 7
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- 238000001179 sorption measurement Methods 0.000 description 6
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- 230000007423 decrease Effects 0.000 description 5
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- 239000002184 metal Substances 0.000 description 5
- 239000011164 primary particle Substances 0.000 description 5
- 238000000354 decomposition reaction Methods 0.000 description 4
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- 235000010446 mineral oil Nutrition 0.000 description 4
- -1 polyethylene Polymers 0.000 description 4
- 239000011342 resin composition Substances 0.000 description 4
- CWJHMZONBMHMEI-UHFFFAOYSA-N 1-tert-butylperoxy-3-propan-2-ylbenzene Chemical compound CC(C)C1=CC=CC(OOC(C)(C)C)=C1 CWJHMZONBMHMEI-UHFFFAOYSA-N 0.000 description 3
- BIISIZOQPWZPPS-UHFFFAOYSA-N 2-tert-butylperoxypropan-2-ylbenzene Chemical compound CC(C)(C)OOC(C)(C)C1=CC=CC=C1 BIISIZOQPWZPPS-UHFFFAOYSA-N 0.000 description 3
- 238000004438 BET method Methods 0.000 description 3
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- 238000003303 reheating Methods 0.000 description 3
- XOUQAVYLRNOXDO-UHFFFAOYSA-N 2-tert-butyl-5-methylphenol Chemical compound CC1=CC=C(C(C)(C)C)C(O)=C1 XOUQAVYLRNOXDO-UHFFFAOYSA-N 0.000 description 2
- KWOLFJPFCHCOCG-UHFFFAOYSA-N Acetophenone Chemical compound CC(=O)C1=CC=CC=C1 KWOLFJPFCHCOCG-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
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- 150000001993 dienes Chemical class 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- 239000005038 ethylene vinyl acetate Substances 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 229920001903 high density polyethylene Polymers 0.000 description 2
- 239000004700 high-density polyethylene Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- IPJGAEWUPXWFPL-UHFFFAOYSA-N 1-[3-(2,5-dioxopyrrol-1-yl)phenyl]pyrrole-2,5-dione Chemical compound O=C1C=CC(=O)N1C1=CC=CC(N2C(C=CC2=O)=O)=C1 IPJGAEWUPXWFPL-UHFFFAOYSA-N 0.000 description 1
- HXIQYSLFEXIOAV-UHFFFAOYSA-N 2-tert-butyl-4-(5-tert-butyl-4-hydroxy-2-methylphenyl)sulfanyl-5-methylphenol Chemical compound CC1=CC(O)=C(C(C)(C)C)C=C1SC1=CC(C(C)(C)C)=C(O)C=C1C HXIQYSLFEXIOAV-UHFFFAOYSA-N 0.000 description 1
- OIGWAXDAPKFNCQ-UHFFFAOYSA-N 4-isopropylbenzyl alcohol Chemical compound CC(C)C1=CC=C(CO)C=C1 OIGWAXDAPKFNCQ-UHFFFAOYSA-N 0.000 description 1
- 239000004971 Cross linker Substances 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
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- 239000011256 inorganic filler Substances 0.000 description 1
- 229910003475 inorganic filler Inorganic materials 0.000 description 1
- ZFSLODLOARCGLH-UHFFFAOYSA-N isocyanuric acid Chemical compound OC1=NC(O)=NC(O)=N1 ZFSLODLOARCGLH-UHFFFAOYSA-N 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
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- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical compound OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/34—Heterocyclic compounds having nitrogen in the ring
- C08K5/3467—Heterocyclic compounds having nitrogen in the ring having more than two nitrogen atoms in the ring
- C08K5/3477—Six-membered rings
- C08K5/3492—Triazines
- C08K5/34924—Triazines containing cyanurate groups; Tautomers thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C1/00—Fuselages; Constructional features common to fuselages, wings, stabilising surfaces or the like
- B64C1/26—Attaching the wing or tail units or stabilising surfaces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C3/00—Wings
- B64C3/18—Spars; Ribs; Stringers
- B64C3/187—Ribs
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
- C08K5/0025—Crosslinking or vulcanising agents; including accelerators
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/14—Peroxides
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/06—Insulating conductors or cables
- H01B13/14—Insulating conductors or cables by extrusion
- H01B13/148—Selection of the insulating material therefor
-
- 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
- H01B3/44—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 vinyl resins; acrylic resins
- H01B3/441—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 vinyl resins; acrylic resins from alkenes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/29—Protection against damage caused by extremes of temperature or by flame
- H01B7/292—Protection against damage caused by extremes of temperature or by flame using material resistant to heat
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G15/00—Cable fittings
- H02G15/08—Cable junctions
- H02G15/18—Cable junctions protected by sleeves, e.g. for communication cable
- H02G15/184—Cable junctions protected by sleeves, e.g. for communication cable with devices for relieving electrical stress
- H02G15/188—Cable junctions protected by sleeves, e.g. for communication cable with devices for relieving electrical stress connected to a cable shield only
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G15/00—Cable fittings
- H02G15/08—Cable junctions
- H02G15/18—Cable junctions protected by sleeves, e.g. for communication cable
- H02G15/196—Cable junctions protected by sleeves, e.g. for communication cable having lapped insulation
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/005—Additives being defined by their particle size in general
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/006—Additives being defined by their surface area
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/04—Carbon
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49616—Structural member making
- Y10T29/49622—Vehicular structural member making
Definitions
- the present invention relates to a crosslinked polyolefin composition, a DC power cable having an insulating layer formed of the crosslinked polyolefin composition (herein referred to as "DC power cable” in the present application), and a method of applying a DC power line using a DC power cable.
- An extruded insulated cable (hereinafter referred to as an XLPE cable), in which an insulating layer is formed using a composition of cross-linked polyethylene (XLPE), is generally used as an AC power cable (referred to as "AC power cable” in the present application).
- AC power cable AC power cable
- An oil immersion cable (OF cable, MI cable) is generally used as a high voltage DC power cable of 22 V or more.
- DCP dicumyl peroxide
- Patent Document 1 describes that, in an XLPE-based cable, the direct current characteristics are improved by blending a certain type of carbon black with the composition of the XLPE-based material that forms the insulating layer.
- patent document 2 describes that triallyl isocyanurate is mix
- Patent Document 3 discloses that, in a direct current power cable, a resin composition obtained by blending triallyl isocyanurate and a diene polymer with polyolefin is crosslinked to form an insulator layer, and a certain amount of organic peroxide crosslinking agent is used. It is described that formation of space charge due to a crosslinking agent decomposition residue is suppressed by blending triallyl isocyanurate and a diene-based polymer while suppressing the following.
- the inventors evaluated the electrical characteristics of the DC power cable in which the insulating layer was formed by the composition of XLPE type which blended carbon black. As a result, it has been found that sufficient electrical characteristics can not always be obtained after adding a thermal history for a fixed time. For example, the DC breakdown characteristics evaluated after heating at 160 ° C. for 10 hours or more decreased to nearly 70% of the characteristics before heating.
- connection portion and the end portion of XLPE cables In the case of mold jointing the connection portion and the end portion of XLPE cables, when the semiconductive layer and the insulating layer covering the connection portion and the end portion of the cable are heat-molded, the high temperature heat as described above History is added. For this reason, in the XLPE cable in which the direct current electrical characteristics are deteriorated after the heat history is added, the performance in the vicinity of the connection portion and the end portion is affected, which is disadvantageous for direct current power transport.
- An object of the present invention is to improve the insulating material for a DC power cable disclosed in Patent Document 1 (Japanese Patent No. 3602297), and to suppress the deterioration of DC electrical characteristics due to heat history. It is to provide. That is, to provide a DC power cable of XLPE type that can be used for higher voltage power transportation.
- the crosslinked polyolefin composition according to the present invention is a crosslinked polyolefin composition in which an organic peroxide crosslinking agent is blended with a polyolefin, and further, (1) per 100 parts by mass of polyolefin, (2) 0.1 to 5 parts by mass of carbon black and (3) 0.02 to 2 parts by mass of at least one compound selected from triallyl isocyanurate or trimethallyl isocyanurate Do.
- the direct current power cable according to the present invention is characterized in that an insulating layer is formed of the crosslinked polyolefin composition.
- the insulating layer is formed by covering the portion to which the DC power cable is connected with an insulating material and performing a heating process.
- the crosslinked polyolefin composition according to the present invention comprises (1) 0.1 to 5 parts by mass of (2) carbon black with respect to 100 parts by mass of polyolefin, and (3) triallyl isocyanurate or trime as a crosslinking assistant. It comprises 0.02 to 2 parts by mass of at least one compound selected from taryl isocyanurate, and (4) a predetermined amount of an organic peroxide crosslinking agent.
- part by mass indicates the mass ratio of each raw material to be blended, and in the following description, indicates the part by mass with respect to 100 parts by mass of polyolefin.
- Polyolefins form the basis of the crosslinked polyolefin composition according to the invention.
- polyolefins include low density polyethylene (LDPE), high density polyethylene (HDPE), ethylene-vinyl acetate copolymer, ethylene ethyl acrylate copolymer, polypropylene, ethylene-propylene copolymer, ethylene-propylene-diene copolymer.
- LDPE low density polyethylene
- HDPE high density polyethylene
- ethylene-vinyl acetate copolymer ethylene ethyl acrylate copolymer
- polypropylene ethylene-propylene copolymer
- ethylene-propylene-diene copolymer ethylene-propylene-diene copolymer.
- a polymer, a mixture of two or more of these, and the like can be used.
- the carbon black is preferably nano-dispersed particles having an average primary particle size of 10 to 100 nm. Such a nano-dispersed particle is to exert a space charge suppressing function.
- the average primary particle diameter is given by the following equation.
- Average primary particle size Ni Ni ⁇ Di / Ni Ni
- the carbon black having a size of 10 to 100 nm of the average primary particle diameter is an optimal value that does not disturb the crystal structure of the insulator such as polyethylene. Disruption of the crystal structure reduces the electrical performance of the insulator. If the particle size is larger than this range, the dispersion and mixing of the carbon black will be poor. If it is smaller than this, manufacture is difficult and unrealistic.
- the compounding amount of carbon black is preferably 0.1 to 5 parts by mass. If the amount is less than 0.1 parts by mass, the effect of improving the direct current characteristics can not be obtained. On the other hand, if the amount is more than 5 parts by mass, the direct current characteristics deteriorate. If the amount is more than 5 parts by mass, the amount of the filler will be large, and the long extrusion characteristics will be impaired.
- the proportion of carbon black particles having a particle size of 300 nm or more is preferably 1% by weight or less.
- the lightning impulse breakdown voltage can be improved by setting the proportion of carbon black particles having a particle size of 300 nm or more to 1% by weight or less.
- the conductive protrusion is often the origin of the breakdown.
- the insulating layer of the cable is formed of the crosslinked polyolefin composition according to the present invention
- the aggregates present in the insulating layer become large, the aggregates are in contact with the inner semiconductive layer and the outer semiconductive layer adjacent to the insulating layer. Or the probability of proximity also increases.
- Such carbon aggregates in the vicinity of the inner semiconductive layer and in the vicinity of the outer semiconductive layer are considered to affect the impulse breakage of the cable.
- the carbon black preferably has a ratio of oil absorption (cc / 100 g) of mineral oil to specific surface area (m 2 / g) measured by BET method is 0.7 or more and 3.5 or less.
- the BET method is one of methods of measuring the surface area of powder by vapor phase adsorption method, and is a method of determining the total surface area of a 1 g sample, that is, the specific surface area, from the adsorption isotherm.
- nitrogen gas is often used as the adsorption gas, and the method of measuring the adsorption amount from the change in pressure or volume of the gas to be adsorbed is most frequently used.
- the most prominent ones representing the isotherm of multimolecular adsorption are the Brunauer, Emmett, Teller equations, called the BET equation.
- the BET equation is widely used for surface area determination. The amount of adsorption is determined based on the BET equation, and the surface area is obtained by multiplying the area occupied by one adsorbed molecule on the surface.
- the resistivity (specific resistance) of the crosslinked polyethylene composition is ⁇ ( ⁇ ⁇ m)
- the temperature coefficient of insulation resistance is ⁇ (1 / ° C.)
- the electric field coefficient stress coefficient of insulation resistance
- E kv / mm
- the temperature coefficient ⁇ decreases while the electric field coefficient ⁇ increases, and the leakage of space charge in the insulator composition is promoted.
- the reason is that when the electric field coefficient ⁇ is increased, the resistivity ⁇ is decreased, so that the electric field in the high stress portion (the portion to which the strong electric field is applied) is relaxed.
- the temperature coefficient ⁇ decreases, the maximum electric field Emax appearing on the shielding side decreases when the conductor temperature is high.
- the electric field distribution in the insulator composition moves in the direction of homogenization, and the space charge accumulation is reduced.
- this ratio is larger than 3.5, the degree of aggregation of the particles is increased, the apparent (aggregate) particle diameter is increased, and the condition of mixing with a thermoplastic resin such as polyethylene becomes worse.
- acetylene carbon in particular, this effect is significant because the particles are linked in a chain.
- the carbon black of SAF, ISAF, I-ISAF, CF, SCF, or HAF carbon which is furnace carbon black is used, the above ratio is particularly good in the range of 0.7 to 1.5. What has been confirmed experimentally.
- the carbon black preferably has a carbon content of 97% by weight or more.
- Carbon black contains impurities such as ash, O 2, H 2 and the like, and when the amount of these impurities is large, the electrical characteristics deteriorate. Therefore, the higher the carbon purity, the better.
- the most characteristic point of the crosslinked polyolefin composition according to the present invention is that it contains at least one compound selected from triallyl isocyanurate or trimethallyl isocyanurate as a crosslinking assistant.
- the compounding ratio is 0.02 to 2 parts by mass. If the amount is less than 0.02 parts by mass, the effect of suppressing the decrease in insulation performance due to the high temperature heat history can not be obtained. On the other hand, when the amount is more than 2 parts by mass, slip and resin burn occur in the extruder when extruding the crosslinked polyolefin composition. When resin burning occurs, the resin pressure rises during extrusion, making it impossible to produce a stable DC power cable.
- a further preferable compounding amount of the crosslinking coagent is 0.1 to 2 parts by mass. By blending 0.1 parts by mass or more, the blending amount of the organized oxide crosslinking agent can be reduced, and the effect of suppressing resin burning in the extruder can also be obtained.
- organic peroxide crosslinking agent any organic peroxide used for ordinary crosslinking may be used.
- dicumyl peroxide (DCP) dicumyl peroxide
- t-butylcumyl peroxide t-butylcumyl peroxide
- ⁇ , ⁇ '-bis t-butylperoxy-m-isopropyl
- the decomposition residue of t-butylcumyl peroxide and ⁇ , ⁇ '-bis (t-butylperoxy-m-isopropyl) benzene contains, like the decomposition residue of DCP, compounds having a polar group such as a hydroxyl group.
- DCP dicumyl peroxide
- t-butylcumyl peroxide t-butylcumyl peroxide
- ⁇ , ⁇ '-bis t-butylperoxy-m-isopropyl
- the present invention can solve this problem.
- the compounding quantity of the organic peroxide crosslinking agent is suitably adjusted with the kind of organic peroxide to be used, polyolefin, etc.
- the amount is preferably 0.1 to 5 parts by mass, and more preferably 0.5 to 3 parts by mass.
- the compounding amount of the organic peroxide crosslinking agent is too small, crosslinking is insufficient and mechanical properties and heat resistance of the insulating layer are lowered.
- the compounding amount of the organic peroxide crosslinking agent is too large, resin extruding occurs in the extruder when extruding the crosslinked polyolefin composition. When resin burning occurs, the resin pressure rises during extrusion, making it impossible to produce a stable DC power cable. Also, the electrical performance of the DC power cable is degraded.
- antioxidant commonly used antioxidants can be appropriately selected and blended. Phenolic, phosphite and thioether anti-aging agents are preferred. In particular, 4,4′-thiobis (3-methyl-6-tert-butylphenol) has the effect of suppressing the crosslinking reaction when extruding the crosslinked polyolefin composition, and is thus preferable.
- the compounding amount of the antioxidant is appropriately adjusted in consideration of the type of the antioxidant to be used and the oxidation resistance, but is preferably 0.1 to 1.0 parts by mass.
- FIG. 1 is a cross-sectional view of the created DC cable 10.
- the direct current power cable 10 is formed by sequentially forming an inner semiconductive layer 12, an insulating layer 13, an outer semiconductive layer 14, a metal shielding layer 15, and a sheath 16 outside the conductor 11.
- the cross-sectional area of the conductor 11 is 200 mm 2
- the thickness of the insulating layer 13 is 3 mm
- the thicknesses of the inner semiconductive layer 12 and the outer semiconductive layer 14 are 1 mm.
- Inner semiconductive layer The inner semiconductive layer 12 is formed of ethylene-vinyl acetate copolymer, organic peroxide crosslinker (DCP), carbon black (acetylene black), antioxidant (4,4'-thiobis ( It formed using the composition (semiconductive resin composition) which mix
- Insulating Layer The insulating layer 13 was formed using the crosslinked polyethylene composition according to the present invention.
- the compounding ratio (parts by mass) of the polyolefin, carbon black, crosslinking aid and organic peroxide crosslinking agent is as shown in Tables 1 to 4.
- Carbon black has a specific surface area of 140 m 2 / g as measured by the BET method, an oil absorption of 114 cc / 100 g of mineral oil, a carbon content of 97.5 mass%, and an average particle size of primary particles of 18 nm and coarse particles of 300 nm or more An amount of 1% or less of furnace carbon black SA was used.
- the ratio of oil absorption (cc / 100 g) of mineral oil to specific surface area (m 2 / g) is 0.8.
- Triallyl isocyanurate or trimethallyl isocyanurate was used as a coagent.
- the organic peroxide crosslinking agent DCP, t-butylcumyl peroxide, ⁇ , ⁇ '-bis (t-butylperoxy-m-isopropyl) benzene was used.
- the above materials were kneaded with a Banbury mixer, passed through a metal screen mesh with an opening of 34 ⁇ m, and further mixed with DCP using a Henschel mixer to prepare a crosslinked polyethylene composition.
- (3) Outer Semiconductive Layer The outer semiconductive layer 14 was formed using a semiconductive resin composition having the same composition as the inner semiconductive layer 12.
- compositions (1) to (3) are simultaneously extruded to the outer peripheral part of the conductor 11, and pressure heating is performed at a pressure of 10 kg / cm 2 and a temperature of 280 ° C. in a nitrogen atmosphere, and an organic peroxide crosslinking agent is used as an initiator
- the crosslinking was advanced by the radical reaction.
- a metal shielding layer and a sheath were provided by a conventional method to prepare a DC power cable.
- the DC power line was manufactured by connecting the DC power cable 10 created by the above procedure.
- a schematic cross section of the cable connection is shown in FIG.
- the cable connection portion is formed by connecting two DC power cables 10, 10 with the conductors 11, 11 facing each other at their ends and facing each other (reference numeral 21 in the figure).
- the conductive layer 22, the insulating layer 23, and the outer semiconductive layer 24 are sequentially coated.
- the inner semiconductive layer 22 and the insulating layer 23 are formed by sequentially winding a semiconductive tape and an insulating tape around the conductors 11 and 11 butted connected to each other to a predetermined thickness and then heating and fusing the wound tape. Be done.
- the outer semiconductive layer 24 is formed using a semiconductive shrink tube.
- the semiconductive tape and the semiconductive shrink tube were formed using the same semiconductive resin composition (before crosslinking) as the inner semiconductive layer 12 and the outer semiconductive layer 14 of the DC power cable 10.
- the insulating tape is obtained by extruding a crosslinked polyethylene composition (before crosslinking) of the same composition as the insulating layer 13 of the DC power cable 10 into a tape having a thickness of 0.1 mm, a width of 20 mm, and a length of 150 m by a single screw extruder. Created by doing.
- the outer periphery of the semiconductive shrink tube was coated with a gas barrier layer, and the outer periphery of the gas barrier layer was coated with a heater. Further, a cross-linked tube consisting of two halves of the mold and packing at both ends was assembled on the outside of the heater.
- the cross-linked tube is selected to be sufficiently longer than the distance (the range of A to C in FIG. 2) between the outer semiconductive layers 14 of the two DC power cables 10.
- the distance between the outer semiconductive layers 14 is 760 mm, and a cross-linked tube having a length of 1150 mm covering A to D in FIG. 2 was used.
- the internal pressure in the cross-linking tube was adjusted to 0.8 MPa with nitrogen gas, and the temperature was raised by a heater and held at 220 ° C. for 3 hours to form the insulating layer 23 and the outer semiconductive layer 24.
- the broken part In the case of breakage between both ends 23A and 23A of the insulating layer 23, the broken part is A, and in the case of breakage at both ends 23A and 23A of the insulating layer 23, the broken part is B and the end 23A of the insulating layer 23
- the fracture site is C if it is fractured with the end 14A of the outer semiconductive layer 14 or the fracture site if it is fractured between the end 14A of the outer semiconductive layer 14 and the end of the bridging tube. It was D.
- Tables 1 to 4. In manufacturing a direct current power cable, the pressure of the extruded resin was measured with a 34 ⁇ m metal screen mesh portion attached to the tip of the insulating layer extruder screw.
- the extrusion characteristics were evaluated from the rising tendency of the resin pressure 5 hours after the start of the extrusion.
- the criteria for evaluation are as follows. Moreover, x was displayed for what a slip produced in the extruder and stable extrusion was not able to be performed. -: Almost no rise in resin pressure is observed. +: A rise in resin pressure is observed, but there is no problem at all in the production of a long cable. ++: An increase in resin pressure is observed, but a long cable can be manufactured. + ++: Resin pressure rise is recognized, and it is difficult to manufacture a long cable.
- LDPE made by DOW NUC-9026 A: Center of connection, B: Upstanding tape insulation layer, C: Outer conductor treatment section, D: Cable reheating section
- LDPE made by DOW NUC-9026 A: Center of connection, B: Upstanding tape insulation layer, C: Outer conductor treatment section, D: Cable reheating section
- the compounding amount of the crosslinking aid was 0.01 parts by mass (Comparative Examples 1, 5, 8 and 10)
- the direct current breakdown voltage was 200 or less in absolute value, and the direct current electrical characteristics were poor.
- the fracture site was a D portion outside the end 14 A of the outer semiconductive layer 14. The failure occurred at such a site because the direct current electrical characteristics of the insulating layer 13 of the direct current power cable were deteriorated by the heat treatment for crosslinking the crosslinked polyethylene composition to be the insulating layer 23 of the connection portion.
- Example 4 and Comparative Example 1 The blending amounts of the crosslinking agent in Example 4 and Comparative Example 1, Example 10 and Comparative Example 5, Example 13 and Comparative Example 8, and Example 16 and Comparative Example 10 are the same.
- the direct current electricity in Examples 4, 10, 13, 16 is higher than that in Comparative Examples 1, 5, 8, 10.
- the decrease in characteristics is small. From this result, it can be seen that the effect of preventing deterioration of the direct current electrical characteristics at the time of reheating becomes remarkable when the triallyl isocyanurate or trimethallyl isocyanurate is added in an amount of not less than 0.02 parts by mass.
- Comparative Example 3 in which the blending amount of carbon black is small, and Comparative Example 4 in which the blending amount of carbon black is large, the DC breakdown voltage is low and the DC electrical characteristics are not sufficient.
- the comparative example 7 is an example which mix
- the cable D is broken at -160 kV. This destruction occurs because the DC electric characteristics of the insulating layer 13 of the DC power cable are deteriorated by the heat treatment for crosslinking the crosslinked polyethylene composition to be the insulating layer 23 of the connection portion. From this result, it can be seen that m? -Phenylene bismaleimide does not have an effect like triallyl isocyanurate or trimethallyl isocyanurate.
- the cross-linked polyethylene composition according to the present invention it is possible to obtain a DC power cable with little deterioration in electrical characteristics even when subjected to heat history. Also, this DC power cable can be used for higher voltage DC power transportation.
- connection method of cable the method of forming the insulating layer by winding the insulating tape and heating it is described, but the connection method used in the method of manufacturing the DC power line of the present invention is Any other method may be employed as long as the connecting portion is covered with an insulating material and heat treated.
- a so-called extrusion molding method (EMJ) of extruding an insulating material using an extruder and heating and crosslinking it to form an insulating layer may be adopted as a connection method. it can.
- EMJ extrusion molding method
- the insulating material used to connect the cable may not have the same composition as the insulating material used for the cable insulator shown in the embodiment, as long as it is a DC insulating material.
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Abstract
Description
(1)ポリオレフィン100質量部に対して、
(2)カーボンブラックを0.1~5質量部、及び
(3)トリアリルイソシアヌレートまたはトリメタリルイソシアヌレートから選ばれる少なくとも1種以上の化合物を0.02~2質量部配合したことを特徴とする。
本発明は、以下の詳細な説明及び添付図面によって、より十分に理解されるであろうが、これらはもっぱら説明のためのものであって、本発明の範囲を限定するものではない。
ポリオレフィンは、本発明に係る架橋ポリオレフィン組成物のベースとなる。ポリオレフィンとしては、例えば、低密度ポリエチレン(LDPE)、高密度ポリエチレン(HDPE)、エチレン-酢酸ビニル共重合体、エチレンエチルアクリレート共重合体、ポリプロピレン、エチレン-プロピレン共重合体、エチレン-プロピレン-ジエン共重合体や、これらの2以上の混合物等を用いることができる。
カーボンブラックは、平均一次粒径が10~100nmのナノ分散粒子であることが好ましい。このようなナノ分散粒子であれば、空間電荷抑制作用を発揮するためである。
平均一次粒径=ΣNi・Di/ΣNi
この平均一次粒径10~100nmの大きさのカーボンブラックが、ポリエチレンなどの絶縁体の結晶構造を乱さない最適の値である。結晶構造が乱されると絶縁体の電気的性能が低下する。また粒径がこれより大きいとカーボンブラックの分散や交じり具合が悪くなる。またこれより小さい場合は製造が難しく現実的でない。
架橋ポリエチレン組成物の抵抗率(比抵抗)をρ(Ω・m)とし、絶縁抵抗の温度係数をα(1/℃)、電界係数(絶縁抵抗のストレス係数)をβ(mm/kv)、絶縁体にかかる電界強度をE(kv/mm)とすれば、以下の関係が成り立つことが知られている。
ρ=ρ0exp-(αT+βE) ・・・(1)
なお、ファーネス系カーボンブラックであるSAF、ISAF、I-ISAF、CF、SCF、HAFカーボンのいずれかのカーボンブラックを用いたときには、上記の比が0.7~1.5の範囲で、特に良好なことが実験的に確かめられている。
本発明に係る架橋ポリオレフィン組成物の最も特徴的な点は、架橋助剤として、トリアリルイソシアヌレートまたはトリメタリルイソシアヌレートから選ばれる少なくとも1種以上の化合物を配合する点である。配合比は、0.02~2質量部である。0.02質量部未満では、高温の熱履歴による絶縁性能低下を抑制する効果が得られない。一方、2質量部を越えると、架橋ポリオレフィン組成物を押し出しする際、押出機内でスリップや樹脂焼けが生じる。樹脂焼けが生じると、押し出し中に樹脂圧力が上昇し、安定した直流電力ケーブルの製造ができなくなる。また、直流ケーブルの電気性能も低下する。前記架橋助剤のさらに好ましい配合量は、0.1~2質量部である。0.1質量部以上配合することで、有機化酸化物架橋剤の配合量を減らすことができ、押出機内における樹脂焼けを抑制する効果も得ることができる。
有機過酸化物架橋剤としては、通常の架橋に用いる有機過酸化物であればよい。例えば、ジクミルパーオキサイド(DCP)、t-ブチルクミルパーオキサイド、α,α’-ビス(t-ブチルパーオキシ-m-イソプロピル)ベンゼン等を用いることができる。t-ブチルクミルパーオキサイド、α,α’-ビス(t-ブチルパーオキシ-m-イソプロピル)ベンゼンの分解残渣には、DCPの分解残渣と同様、水酸基などの極性基を有した化合物が含まれており、DCPを用いた場合と同様、前述の問題が発生するが、本発明により、この問題を解決できる。
また、必要に応じて架橋ポリオレフィン組成物に酸化防止剤を配合してもよい。酸化防止剤としては、一般に使用される酸化防止剤を適宜選択して配合することができる。フェノール系、ホスファイト系、チオエーテル系の老化防止剤が好ましい。特に、4,4’-チオビス(3-メチル-6-tert-ブチルフェノール)は、架橋ポリオレフィン組成物を押し出しする際、架橋反応を抑制する効果があり、好ましい。
酸化防止剤の配合量は、使用する酸化防止剤の種類、耐酸化性能を考慮して適宜調整されるが、0.1~1.0質量部であることが好ましい。
以下、本発明を実施例に基づいてさらに詳細に説明する。
図1は作成した直流ケーブル10の断面図である。図1に示すように、直流電力ケーブル10は、導体11の外側に内部半導電層12、絶縁層13、外部半導電層14、金属遮蔽層15、シース16を順に形成してなる。導体11の断面積は200mm2、絶縁層13の厚さは3mmであり、内部半導電層12、および、外部半導電層14の厚さはそれぞれ1mmである。
内部半導電層12は、エチレン-酢酸ビニル共重合体、有機過酸化物架橋剤(DCP)、カーボンブラック(アセチレンブラック)、酸化防止剤(4,4’-チオビス(3-メチル-6-tert-ブチルフェノール))を配合した組成物(半導電性樹脂組成物)を用いて形成した。
(2)絶縁層
絶縁層13は、本発明に係る架橋ポリエチレン組成物を用いて形成された。ポリオレフィン、カーボンブラック、架橋助剤、有機過酸化物架橋剤の配合比(質量部)は表1~4に示すとおりである。
ポリオレフィンには、LDPE(DOW社製のNUC-9026)を用いた。カーボンブラックは、BET法で測定した比表面積140m2/g、鉱物油の吸油量114cc/100g、炭素含有量が97.5質量%、一次粒子の平均粒径が18nm、300nm以上の粗粒含有量が1%以下のファーネス系カーボンブラックであるSAFを用いた。比表面積(m2/g)に対する鉱物油の吸油量(cc/100g)の比は、0.8である。
架橋助剤には、トリアリルイソシアヌレートまたはトリメタリルイソシアヌレートを用いた。
有機過酸化物架橋剤には、DCP、t-ブチルクミルパーオキサイド、α,α’-ビス(t-ブチルパーオキシ-m-イソプロピル)ベンゼンを用いた。
上記材料をバンバリーミキサーにより混練し、目開き34μmの金属製スクリーンメッシュに通し、さらにヘンシェル混合機によりDCPを混合することで架橋ポリエチレン組成物を作成した。
(3)外部半導電層
外部半導電層14は、内部半導電層12と同じ配合の半導電性樹脂組成物を用いて形成された。
直流電力線路は、上記手順により作成した直流電力ケーブル10を接続して製造された。
ケーブル接続部の概略断面を図2に示す。ケーブル接続部は、図2に示すように、2本の直流電力ケーブル10、10を端部で導体11、11同士を対向させて突き合わせて接続し(図中符号21)、その周囲を内部半導電層22、絶縁層23、外部半導電層24により順に被覆した構造である。
以下、ケーブルの接続方法について説明する。
まず、2本の直流電力ケーブル10、10の終端部をシース16、金属遮蔽層15、外部半導電層14、絶縁層13、内部半導電層12の順に段状に剥ぎ、略円錐形状に加工した。次に、2本の直流ケーブル10、10の導体11、11同士を付き合わせて接続を行い、導体接続部21を形成した。次に、半導電性テープを導体接続部21に巻きまわし、加熱融着することで、内部半導電層22を作成した。
次に、絶縁テープを内部半導電層22に巻きまわし、さらにその外周を半導電性収縮チューブで被覆した。この上に、更に半導電性収縮チューブを被せ加熱し収縮させた。
その後、架橋管内の内圧を窒素ガスにより0.8MPaとし、ヒーターにより昇温し220℃を3時間保持することで、絶縁層23、外部半導電層24を形成した。
(1)製造した電力ケーブルの架橋度は、ケーブル絶縁体の厚さ方向の中間部分より試験片を採取し、JISC 3005 4.25項に準拠して測定した。
(2)接続した直流電力ケーブルの直流破壊電圧(kV)を計測した。ケーブル接続部を含む全長20mの直流電力ケーブルに対し、-60kVのスタート電圧から-20kV/10分のステップアップで電圧を上昇させて破壊電圧を測定した。通電中の導体温度は90℃となるように調整した。なお、接続前の直流電力ケーブルの直流破壊電圧は平均-320kVであった。
(3)破壊後に接続部を解体し、破壊部位を特定した。絶縁層23の両端部23A、23Aの間で破壊された場合は破壊部位をA、絶縁層23の両端部23A、23Aで破壊された場合は破壊部位をB、絶縁層23の端部23Aと外部半導電層14の端部14Aとの間で破壊された場合は破壊部位をC、外部半導電層14の端部14Aと架橋管の端部との間で破壊された場合は破壊部位をDとした。
結果を表1~4に示す。
(4)直流電力ケーブルを製造するに当たり、絶縁層押出機スクリュー先端に装着した目開き34μmの金属製スクリーンメッシュメッシュ部分で押出樹脂圧力を測定した。押出開始から5時間経過した時点での樹脂圧力の上昇傾向から押出特性を評価した。評価の基準は以下の通りである。また、押出機中でスリップが生じて安定した押出ができなかったものには×を表示した。
-:樹脂圧力の上昇はほとんど認められない。
+:樹脂圧力の上昇は認められるが、長尺ケーブル製造上全く問題ない。
++:樹脂圧力の上昇は認められるが、長尺ケーブル製造が可能である。
+++:樹脂圧上昇が認められ、長尺ケーブルの製造が困難である。
種々の典型的な実施の形態を示しかつ説明してきたが、本発明は上記実施の形態に限定されない。したがって、本発明の範囲は、次の請求の範囲によってのみ限定されるものである。
11 導体
12、22 内部半導電層
13、23 絶縁層
14、24 外部半導電層
14A 端部
21 導体接続部
23A 両端部
Claims (3)
- ポリオレフィンに有機過酸化物架橋剤を配合した架橋ポリオレフィン組成物であって、
更に、
(1)ポリオレフィン100質量部に対して、
(2)カーボンブラックを0.1~5質量部、及び
(3)トリアリルイソシアヌレートまたはトリメタリルイソシアヌレートから選ばれる少なくとも1種以上の化合物を0.02~2質量部を配合したことを特徴とする架橋ポリオレフィン組成物。 - 請求項1に記載の架橋ポリオレフィン組成物で絶縁層を形成することを特徴とする直流電力ケーブル。
- 請求項2に記載の直流電力ケーブルを接続した部分を絶縁材料で覆い加熱処理することにより絶縁層を形成することを特徴とする直流電力線路の製造方法。
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CN201180007567.6A CN102725344B (zh) | 2010-01-28 | 2011-01-21 | 交联聚烯烃组合物、直流电力电缆和直流电力线路的施工方法 |
HK13103782.1A HK1176371A1 (zh) | 2010-01-28 | 2013-03-26 | 交聯聚烯烴組合物、直流電力電纜和直流電力線路的施工方法 |
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---|---|---|---|---|
WO2014040237A1 (en) * | 2012-09-12 | 2014-03-20 | Dow Global Technologies Llc | Cross-linkable polymeric compositions, methods for making the same, and articles made therefrom |
WO2014148071A1 (ja) * | 2013-03-22 | 2014-09-25 | 株式会社オートネットワーク技術研究所 | 端子付き被覆電線 |
WO2016000735A1 (en) | 2014-06-30 | 2016-01-07 | Abb Technology Ltd | Power transmission cable |
EP3336858A4 (en) * | 2015-08-10 | 2018-08-22 | Sumitomo Electric Industries, Ltd. | Dc cable, and method for manufacturing composition and dc cable |
WO2020008056A1 (de) * | 2018-07-06 | 2020-01-09 | Nkt Gmbh & Co. Kg | Verbindungsmuffe mit konische aufnahmebereiche zur aufnahme von konisch abgementelten kabelenden |
EP3951807A4 (en) * | 2019-03-29 | 2022-11-09 | Furukawa Electric Co., Ltd. | INSULATING TAPE FOR COVERING A POWER CABLE CONNECTING PART, METHOD FOR FORMING AN INSULATING COATING ON THE OUTER SURFACE OF A POWER CABLE CONNECTING PART, AND POWER CABLE |
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JP6591564B2 (ja) * | 2015-05-22 | 2019-10-16 | ダウ グローバル テクノロジーズ エルエルシー | 架橋絶縁層を備えたケーブルを調製するための方法 |
JP6205032B1 (ja) * | 2016-08-09 | 2017-09-27 | 株式会社Nuc | 直流電力ケーブル用絶縁性樹脂組成物、樹脂架橋体、直流電力ケーブル、直流電力ケーブル接続部の補強絶縁層形成用部材および直流電力ケーブル接続部 |
CN107573574B (zh) * | 2017-09-07 | 2020-08-11 | 南京南瑞集团公司 | ±525kV及以下直流电缆屏蔽材料及其制备方法 |
CN113597447B (zh) * | 2019-03-29 | 2024-03-05 | 古河电气工业株式会社 | 绝缘性树脂组合物及其制造方法、绝缘带及其制造方法、绝缘层形成方法、以及电力电缆及其制造方法 |
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- 2011-01-21 JP JP2011551826A patent/JPWO2011093211A1/ja active Pending
- 2011-01-21 KR KR1020127019721A patent/KR101454092B1/ko not_active IP Right Cessation
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Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2014040237A1 (en) * | 2012-09-12 | 2014-03-20 | Dow Global Technologies Llc | Cross-linkable polymeric compositions, methods for making the same, and articles made therefrom |
US20150203701A1 (en) * | 2012-09-12 | 2015-07-23 | Dow Global Technologies Llc | Cross-linkable polymeric compositions, methods for making the same, and articles made therefrom |
JP2015534589A (ja) * | 2012-09-12 | 2015-12-03 | ダウ グローバル テクノロジーズ エルエルシー | 架橋性ポリマー組成物、その作製方法、およびそれから作製される物品 |
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WO2014148071A1 (ja) * | 2013-03-22 | 2014-09-25 | 株式会社オートネットワーク技術研究所 | 端子付き被覆電線 |
WO2016000735A1 (en) | 2014-06-30 | 2016-01-07 | Abb Technology Ltd | Power transmission cable |
EP3336858A4 (en) * | 2015-08-10 | 2018-08-22 | Sumitomo Electric Industries, Ltd. | Dc cable, and method for manufacturing composition and dc cable |
EP3336857A4 (en) * | 2015-08-10 | 2018-09-05 | Sumitomo Electric Industries, Ltd. | Dc cable, composition, and method for manufacturing dc cable |
US10643763B2 (en) | 2015-08-10 | 2020-05-05 | Sumitomo Electric Industries, Ltd. | Direct-current cable, composition and method of manufacturing direct-current cable |
WO2020008056A1 (de) * | 2018-07-06 | 2020-01-09 | Nkt Gmbh & Co. Kg | Verbindungsmuffe mit konische aufnahmebereiche zur aufnahme von konisch abgementelten kabelenden |
EP3951807A4 (en) * | 2019-03-29 | 2022-11-09 | Furukawa Electric Co., Ltd. | INSULATING TAPE FOR COVERING A POWER CABLE CONNECTING PART, METHOD FOR FORMING AN INSULATING COATING ON THE OUTER SURFACE OF A POWER CABLE CONNECTING PART, AND POWER CABLE |
US11823816B2 (en) | 2019-03-29 | 2023-11-21 | Furukawa Electric Co., Ltd. | Insulating tape for coating connection portion of power cable, method for forming insulating coating on exterior surface of connection portion of power cable, and power cable |
Also Published As
Publication number | Publication date |
---|---|
JPWO2011093211A1 (ja) | 2013-06-06 |
CN102725344A (zh) | 2012-10-10 |
KR20120115345A (ko) | 2012-10-17 |
KR101454092B1 (ko) | 2014-10-22 |
HK1176371A1 (zh) | 2013-07-26 |
CN102725344B (zh) | 2015-12-09 |
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