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WO2014112682A1 - Câble électrique - Google Patents

Câble électrique Download PDF

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Publication number
WO2014112682A1
WO2014112682A1 PCT/KR2013/001628 KR2013001628W WO2014112682A1 WO 2014112682 A1 WO2014112682 A1 WO 2014112682A1 KR 2013001628 W KR2013001628 W KR 2013001628W WO 2014112682 A1 WO2014112682 A1 WO 2014112682A1
Authority
WO
WIPO (PCT)
Prior art keywords
power cable
insulating
insulating layer
cable according
base resin
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/KR2013/001628
Other languages
English (en)
Inventor
Ho Souk Cho
Hyun Seok Kim
Jin Ho Nam
Young Eun Cho
Ung Kim
Ik Hyun Ryu
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
Publication of WO2014112682A1 publication Critical patent/WO2014112682A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • 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
    • H01B3/22—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 hydrocarbons
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B9/00—Power cables

Definitions

  • the present invention relates to a power cable. More specifically, the present invention relates to a power cable comprising an insulating layer made from an insulating composition which is recyclable and environmentally friendly, shows excellent flexibility, heat resistance, mechanical and electrical properties and the like and has low production cost.
  • a general power cable comprises a conductor and an insulating layer surrounding the conductor, and a high voltage or ultrahigh voltage power cable may further comprise an inner semiconductive layer between the conductor and the insulating layer, an outer semiconductive layer surrounding the insulating layer, and a sheath layer surrounding the outer semiconductive layer.
  • the temperature at which high-voltage power cables are used was increased from about 90 °C to about 110 °C, and thus it was required to provide an insulating material for preparing an insulating layer which is not deteriorated at the increased temperature or more while maintaining its mechanical and electrical properties.
  • a cross-linked polyolefin such as polyethylene, an ethylene/propylene rubber (EPR), copolymer or an ethylene/propylene/diene monomer (EPDM) copolymer
  • polymers such as cross-linked polyethylene (XLPE), which have been used as the base resin of the insulating material, are difficult to recycle, because they are cross-linked polymer.
  • the sheath layer is made of polyvinyl chloride (PVC), it is difficult to separate from the cross-linked polyethylene (XLPE) of the insulating material and produces toxic chlorinated substances when it is incinerated, and thus it is not environmentally friendly.
  • non-crosslinked high-density polyethylene (HDPE) or low-density polyethylene (LDPE) is recyclable and environmentally friendly.
  • the temperature at which this polymer can be used is lower than that of cross-linked polyethylene (XLPE), and thus the use thereof is significantly limited.
  • polypropylene refers to a highly crystalline isotactic polypropylene which is a thermoplastic material having excellent mechanical properties.
  • the above polypropylene has insufficient flexibility due to its high rigidity, and thus a cable comprising an insulating layer made therefrom shows poor workability, and the use of the polypropylene is limited.
  • an insulating material for a power cable which is recyclable and environmentally friendly, shows excellent flexibility, heat resistance and mechanical and electrical properties and has low production cost, and a power cable comprising an insulating layer prepared therefrom.
  • Another object of the present invention is to provide a power cable comprising an insulating layer made from an insulating material which has improved flexibility and, at the same time, can maintain its heat resistance, mechanical and electrical properties, etc.
  • Still another object of the present invention is to provide a power cable comprising an insulating layer made from an insulating material having a low production cost.
  • the naphthenic hydrocarbon may be a monocyclic naphthenic hydrocarbon.
  • the monocyclic naphthenic hydrocarbon may have a 5- or 6-membered ring structure.
  • the base resin may comprise the non-crosslinked homopolymer and the non-crosslinked propylene copolymer at a mixing ratio of 80:20 to 50:50.
  • the non-crosslinked propylene copolymer may be a copolymer of a propylene monomer with an ethylene monomer.
  • the content of the ethylene monomer may be 15 mole% or less based on the total moles of the monomers constituting the non-crosslinked propylene copolymer.
  • the insulating composition may comprise, based on 100 parts by weight of the base resin, 0.2-5 parts by weight of an amine-, dialkylester-, thioester- or phenol-based antioxidant.
  • the sheath layer may be made from a composition comprising the same base resin as that of the insulating composition.
  • the power cable may further comprise an inner semiconductive layer disposed between the conductors and the insulating layer, and an outer insulating layer covering the insulating layer.
  • the inner semiconductive layer, the outer semiconductive layer, or both may comprise the same base resin as that of the insulating composition.
  • the base resin of the insulating layer of the power cable according to the present invention comprises a non-crosslinked polypropylene resin which has excellent heat resistance so as to be able to be used as the insulating material without needing to be cross-linked, and thus the insulating layer is recyclable and environmentally friendly.
  • the insulating layer of the power cable according to the present invention comprises a specific insulating oil, and thus has improved flexibility and, at the same time, can maintain its heat resistance, mechanical and electrical properties , etc., even though it comprises, as its base resin, a polypropylene resin having insufficient polypropylene due to its high rigidity.
  • the power cable according to the present invention does not comprise an expensive insulating oil having an aromatic hydrocarbon structure, and thus has a low production cost compared to a power cable which comprises an insulating layer made from a conventional insulating material comprising the aromatic insulating material.
  • FIG. 1 is a cross-sectional view schematically showing the cross-sectional structure of a power cable according to the present invention.
  • FIG. 2 is a longitudinal sectional view schematically showing the sectional structure of a power cable according to the present invention.
  • FIGS. 1 and 2 show an embodiment of a power cable according to the present invention.
  • the power cable according to the present invention may comprise: a conductor 1 made of a conductive material, such as copper or aluminum; an insulating layer 3 made of an insulating polymer; an inner semiconductive layer 2 disposed between the conductor 1 and the insulating layer 3 and functioning to suppress partial electrical discharge at the interface between the conductor 1 and the insulating layer 3 and eliminate an air gap between the conductor 1 and the insulating layer 3 and also mitigate local electric field concentration; an outer semiconductive layer 4 functioning to shield the cable and apply a uniform electric field to the insulating material; and a sheath layer 5 for protecting the cable.
  • a conductor 1 made of a conductive material, such as copper or aluminum
  • an insulating layer 3 made of an insulating polymer
  • an inner semiconductive layer 2 disposed between the conductor 1 and the insulating layer 3 and functioning to suppress partial electrical discharge at the interface between the conductor 1 and the insulating layer 3 and eliminate an air gap between the conductor 1 and the insulating layer 3 and also mitigate local electric field concentration
  • the inner or outer semiconductive layer 2 or 4 of the power cable can be made by a conventional method.
  • it may be made from a composition, which comprises the same base resin as that of the insulating layer 3 and can ensure excellent adhesion to the insulating layer 3, so as to prevent exfoliation between the semiconductive layer 2 or 4 and the insulating layer 3, which can shorten the service life of the power cable.
  • the inner or outer semiconductive layer 2 or 4 may comprise a conductive filler such as carbon black in order to ensure semiconductive properties.
  • the sheath layer 5 of the power cable may also be made from a composition comprising the same base resin as that of the insulating layer 3.
  • the specifications of the conductor 1, the insulating layer 3, the semiconductive layers 2 and 4 and the sheath layer 5 may vary depending on the intended use of the cable, the voltage flowing through the cable, etc., and the insulating layer 3, the semiconductive layers 2 and 4 and the sheath layer 5 may be made of the same or different materials.
  • An insulating material forming the insulating layer 3 of the power cable according to the present invention comprises non-crosslinked polypropylene resin as the base resin.
  • the non-crosslinked polypropylene resin may comprise a propylene homopolymer and/or a copolymer of propylene with a comonomer selected from among ethylene and C4-C12 ⁇ -olefins, for example, 1-butene, 1-pentene, 4-methyl-1-pentene, 1-hexene, 1-octene, 1-decene, 1-dodecene, and combinations thereof, preferably ethylene.
  • the copolymer of propylene with ethylene has strong and flexible properties.
  • the mixing ratio of the propylene homopolymer to the propylene copolymer may be, for example, 80:20 to 50:50.
  • the content of the comonomer in the propylene copolymer may be 15 mole% or less, and preferably 10 mole% or less, based on the total moles of the monomers of the propylene copolymer.
  • a propylene/ethylene copolymer is preferable.
  • the propylene copolymer may be a random copolymer or block copolymer of propylene with ethylene and/or ⁇ -olefin.
  • the polypropylene may comprise a mixture of polyolefins, including low-density polyethylene and linear low-density polyethylene.
  • the propylene homopolymer or copolymer preferably has a peak crystallization temperature of 110 to 125 °C as measured by differential scanning calorimetry (DSC). If the peak crystallization temperature is lower than 110 °C, the propylene homopolymer and/or copolymer can be melted under the aging test conditions (135 or 150°C) provided in IEC international standards or cannot satisfy a continuous service temperature of 90 °C. If the peak crystallization temperature is higher than 125 °C, the crystallization rate of the propylene homopolymer or copolymer during cooling will be fast, and thus the tensile elongation at room temperature will be insufficient.
  • DSC differential scanning calorimetry
  • the propylene homopolymer or copolymer preferably has a weight-average molecular weight (Mw) of 200,000-450,000. If the weight-average molecular weight (Mw) is less than 200,000, the mechanical properties before and after heating will be insufficient, and if it is more than 450,000, the processability of the propylene homopolymer or copolymer can be reduced due to high viscosity.
  • the propylene homopolymer or copolymer preferably has a molecular weight distribution (Mw/Mn) of 2-8. If the molecular weight distribution (Mw/Mn) of the propylene homopolymer or copolymer is less than 2, the processability can be reduced due to high viscosity, and if it is more than 8, the mechanical properties before and after heating can be insufficient.
  • Mw/Mn molecular weight distribution
  • the propylene homopolymer or copolymer may, for example, have a melt index of 0.01-1,000 dg/min as measured in accordance with ASTM D-1238, a melting point (Tm) of 140 to 175 °C as measured by differential scanning calorimetry (DSC), a melt enthalpy of 30-85 J/g as measured by differential scanning calorimetry (DSC), and a flexural modulus of 30-1,400 MPa, preferably 60-1,000 MPa, as measured in accordance with ASTM D790-00.
  • the propylene homopolymer or copolymer in the present invention has a high melting point, so that an insulating layer made from the propylene homopolymer or copolymer shows improved properties at increased temperature, and thus can provide a power cable which can be used at increased temperature.
  • the propylene homopolymer or copolymer is a non-crosslinked polymer, and thus is recyclable and environmentally friendly.
  • a crosslinked polymer according to the prior art is difficult to recycle and is not environmentally friendly.
  • premature crosslinking or scorching occurs in a process of making an insulating layer, the uniform production of the insulating material cannot be ensured and the extrudability can be reduced.
  • the non-crosslinked homopolymer or copolymer can be prepared by a conventional method. Specifically, it can be prepared by homopolymerization of propylene or copolymerization of propylene with ethylene or ⁇ -olefin(s) other than propylene in the presence of a Ziegler-Natta catalyst having low stereospecificity.
  • the insulating composition forming the insulating layer 3 of the power cable according to the present invention may comprise, in addition to the above-described resin, specific insulating oil.
  • the insulating oil may comprise a naphthenic hydrocarbon.
  • naphthene refers to a collection of saturated hydrocarbons having a structure in which carbons in the molecule are bonded to form a ring. Naphthene is also named "cycloparaffin", because it has properties similar to those of paraffinic hydrocarbons.
  • the insulating oil may comprise a monocyclic naphthenic hydrocarbon having a molecular formula of C n H 2n wherein n is an integer ranging from 20 to 60, that is, a naphthenic hydrocarbon having a structure of the following Chemistry Figure 1 in which a cyclic hydrocarbon and an acyclic hydrocarbon are alternately arranged.
  • the cyclic hydrocarbon may be 3 to 6 membered, and preferably 5- or 6-membered.
  • the insulating oil that is used in the present invention preferably has 20 to 60 carbon atoms. If the insulating oil has less than 20 carbon atoms, it can be vaporized and decomposed due to its low molecular weight in a process of extruding the insulating layer, and if it has more than 60 carbon atoms, it can flow out due to its high molecular weight in a process of extruding the insulating layer.
  • the content of the insulating oil in the insulating composition forming the insulating layer 3 of the power cable according to the present invention may be 2.5-10 parts by weight based on 100 parts by weight of the propylene homopolymer or copolymer that is the base resin. If the content of the insulating oil is less than 2.5 parts by weight, an insulating layer made from the insulating composition cannot have sufficient flexibility so that an operation of installing the cable will not be easy, and if the content of the insulating oil is more than 10 parts by weight, the insulating oil can flow out in a process of extruding the insulating layer, so that the manufacture and processing of the cable will be difficult.
  • the insulating oil that is used in the present invention has a very high rigidity, and thus improves the flexibility of an insulating layer made from the insulating composition comprising the low-flexibility polypropylene resin as the base resin while maintaining the excellent heat resistance and mechanical and electrical properties of the polypropylene resin. Further, the insulating oil that is used in the present invention is significantly inexpensive, and thus reduces the production cost of the cable, while it provides equal or superior flexibility, heat resistance and mechanical and electrical properties compared to the use of conventional insulating oil having an aromatic hydrocarbon structure.
  • the insulating composition forming the insulating layer 3 of the power cable according to the present invention may comprise, in addition to the base resin and the insulating oil, other additives such as an antioxidant.
  • the antioxidant that is used in the present invention may be an amine-, dialkylester-, thioester- or phenol-based antioxidant, and examples thereof include distearyl thiopropionate, pentaerythritol tetrakis[3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate], [3-[3-(3,5-di-t-butyl-4-hydroxyphenyl)propanoyloxy]-2,2-bis[3-(3,5-di-t-butyl-4-hydroxyphenyl)propanoyloxymethyl]propyl], 3-(3,5-di-t-butyl-4-hydroxyphenyl)propanoate, thioethylene bis(3,5-di-t-butyl-4-hydroxy
  • insulating compositions were prepared. Using each of the compositions, a sample sheet having a thickness of 2 mm and a size of 30 cm x 30 cm was prepared using a hot press. Here, the units of the amount shown in Table 1 are parts by weight.
  • Base resin 50:50 mixture of polypropylene (Q200, Basell) and an ethylene-propylene copolymer (R520Y, SK Global Chemical)
  • the tensile strength and tensile elongation of the sample sheet prepared in each of Example 1 and Comparative Examples 1 to 5 were measured at a tensile speed of 250 mm/min at room temperature.
  • the IEC standard requires that the tensile strength be 1.27 kgf/mm2 or more and the tensile elongation be 200% or more.
  • each of the sample sheets prepared in Example 1 and Comparative Examples 1 to 5 was aged by heating at 150 °C for 168 hours, and then the mechanical properties thereof were measured in the same manner as described in the above section 1).
  • the flexural strength of each of the sample sheets prepared in Example 1 and Comparative Examples 1 to 5 was measured.
  • lower values indicate better flexibility and workability (including installation property) of an insulating layer and cable comprising the sample sheet.
  • the insulating oil flowed out, and thus slippage occurred in the extruder during the extrusion process of preparing the sample sheet, so that a sample sheet could not be prepared and the physical properties could not be measured.
  • the insulating oil (C 30 H 60 ) contained in the insulating composition of Comparative Example 3 has a multicyclic structure, and thus has insufficient miscibility with the base resin so that it cannot exhibit its function, the residual elongation of the sample sheet after heating was 70% (less than 75%), suggesting that the mechanical properties are insufficient. Also, the sample sheet of Comparative Example 3 showed low dielectric breakdown strength (55 kV/mm), suggesting that it has insufficient electrical properties.
  • the sample sheet of Comparative Example 4 showed the highest flexural strength of 42 MPa, indicating the worst flexibility, and also showed the lowest dielectric breakdown strength (55 kV/mm), indicating the worst electrical properties.
  • Example 1 showed excellent mechanical properties at room temperature and after heating. In addition, because it contains suitable insulating oil, it showed the lowest flexural strength (30 MPa), indicating the best flexibility, and also showed the highest dielectric breakdown strength (65 kV/mm), indicating the best electrical properties.

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  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Insulating Materials (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

La présente invention porte sur un câble électrique. Plus précisément, la présente invention porte sur un câble électrique comprenant une couche d'isolation réalisée à partir d'une composition d'isolation qui est recyclable et écologique, présente une excellente flexibilité, une excellente résistance thermique, et d'excellentes propriétés mécaniques et électriques et analogues et a un faible coût de fabrication.
PCT/KR2013/001628 2013-01-21 2013-02-28 Câble électrique Ceased WO2014112682A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2013-0006324 2013-01-21
KR1020130006324A KR102003565B1 (ko) 2013-01-21 2013-01-21 전력 케이블

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Publication Number Publication Date
WO2014112682A1 true WO2014112682A1 (fr) 2014-07-24

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PCT/KR2013/001628 Ceased WO2014112682A1 (fr) 2013-01-21 2013-02-28 Câble électrique

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KR (1) KR102003565B1 (fr)
WO (1) WO2014112682A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO20190358A1 (en) * 2019-03-18 2020-09-21 Blue Sea Norway As Power cable, method for production and use thereof

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101946945B1 (ko) * 2017-06-16 2019-02-12 일진전기 주식회사 전력케이블용 폴리프로필렌 복합수지 조성물

Citations (5)

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EP0110677A1 (fr) * 1982-11-26 1984-06-13 Exxon Research And Engineering Company Compositions d'élastomères thermoplastiques pour l'isolation de basses tensions
JPH11120825A (ja) * 1997-07-23 1999-04-30 Pirelli Cavi & Syst Spa ケーブル及び難燃性ポリマー組成物
US20070048524A1 (en) * 2003-12-04 2007-03-01 AutoneworksTechnologies, Ltd Non-crosslinked flame-retardant resin compsition, and an insulated wire and a wire harness using the same
JP2008189701A (ja) * 2007-01-31 2008-08-21 Du Pont Mitsui Polychem Co Ltd 非架橋型難燃性樹脂組成物およびこれを用いた絶縁電線
JP4979987B2 (ja) * 2006-06-02 2012-07-18 三井化学株式会社 プロピレン系重合体組成物、および該組成物を用いてなる成形体

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JP2530987B2 (ja) * 1993-04-14 1996-09-04 関西電力株式会社 油浸電力ケ―ブル
JPH11224542A (ja) * 1998-02-04 1999-08-17 Fujikura Ltd 架橋ポリエチレン絶縁電力ケーブル
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CN101595176B (zh) * 2006-11-17 2014-06-18 三井化学株式会社 丙烯类树脂组合物、丙烯类树脂组合物的制造方法、丙烯类聚合物组合物、由该丙烯类树脂组合物形成的成型体和电线
KR20120085606A (ko) * 2011-01-24 2012-08-01 엘에스전선 주식회사 메탈로센 선형 저밀도 폴리에틸렌 수지를 포함하는 고강도 및 고난연성 전력 케이블용 시스 재료 조성물
KR20120095240A (ko) * 2011-02-18 2012-08-28 엘에스전선 주식회사 절연유를 함유하는 절연층을 포함하는 케이블

Patent Citations (5)

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Publication number Priority date Publication date Assignee Title
EP0110677A1 (fr) * 1982-11-26 1984-06-13 Exxon Research And Engineering Company Compositions d'élastomères thermoplastiques pour l'isolation de basses tensions
JPH11120825A (ja) * 1997-07-23 1999-04-30 Pirelli Cavi & Syst Spa ケーブル及び難燃性ポリマー組成物
US20070048524A1 (en) * 2003-12-04 2007-03-01 AutoneworksTechnologies, Ltd Non-crosslinked flame-retardant resin compsition, and an insulated wire and a wire harness using the same
JP4979987B2 (ja) * 2006-06-02 2012-07-18 三井化学株式会社 プロピレン系重合体組成物、および該組成物を用いてなる成形体
JP2008189701A (ja) * 2007-01-31 2008-08-21 Du Pont Mitsui Polychem Co Ltd 非架橋型難燃性樹脂組成物およびこれを用いた絶縁電線

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO20190358A1 (en) * 2019-03-18 2020-09-21 Blue Sea Norway As Power cable, method for production and use thereof
NO345275B1 (en) * 2019-03-18 2020-11-23 Blue Sea Norway As Power cable, method for production and use thereof
US11562833B2 (en) 2019-03-18 2023-01-24 Blue Sea Norway As Power cable, method for production and use thereof
US12119145B2 (en) 2019-03-18 2024-10-15 Blue Sea Norway As Power cable, method for production and use thereof

Also Published As

Publication number Publication date
KR20140094097A (ko) 2014-07-30
KR102003565B1 (ko) 2019-07-24

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