Material challenge of MgO/LDPE nanocomposite for high field electrical insulation

Masayuki Nagao, Yoshinobu Murakami, Yoshinao Murata, Yasuhiro Tanaka, Yoshimichi Ohki, Toshikatsu Tanaka

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    3 Citations (Scopus)

    Abstract

    Polymeric electrical insulating materials are widely used in various power equipments and cables. Additives and fillers are often adopted to polymeric materials for improving insulating and mechanical properties. Recently, nano-fillers are attracting attentions of many researchers and engineers, since they seem to bring higher potentials for advancement of electrical insulating properties as nanocomposites. This paper reports evaluation results of various insulating properties of a MgO/LDPE nanocomposite, jointly carried out by several organizations, aiming at development of an electrical insulating material for higher DC electric field. The DC breakdown strength and the volume resistivity increased with the addition of MgO nanofillers. The thermally stimulated depolarization current (TSDC) peak that spreads over a wide temperature range was observed in all the MgO/LDPE nanocomposites. Furthermore, by adopting a partial heating method, the wide TSDC peak was resolved into several component peaks and it turned out that one of the peaks was attributed to MgO nano-filler, from which it is suggested that a new trap is generated in the nanocomposites. And it was observed from space charge measurement that addition of MgO nano-fillers suppressed packet-like charges in the nanocomposite. The relative permittivity once decreased slightly by addition of MgO nano-fillers and then increased by more addition of them. The electrical treeing inception voltage increased with increasing MgO nano-filler content and it is also recognized that the tree propagation in the MgO/LDPE nanocomposite was suppressed significantly by the addition of MgO nano-fillers. The partial discharge erosion depth of the MgO/LDPE nanocomposite also becomes smaller than that of base LDPE. It is summarized that addition of a small amount of nano-fillers brought excellent insulating performances of the MgO/LDPE nanocomposite. The MgO/LDPE nanocomposite exhibits promising electrical insulating properties to cope with severe requirements and is expected as a new generation of electrical insulating materials for higher electric field application, especially for DC voltages.

    Original languageEnglish
    Title of host publication42nd International Conference on Large High Voltage Electric Systems 2008, CIGRE 2008
    Publication statusPublished - 2008
    Event42nd International Conference on Large High Voltage Electric Systems 2008, CIGRE 2008 - Paris
    Duration: 2008 Aug 242008 Aug 29

    Other

    Other42nd International Conference on Large High Voltage Electric Systems 2008, CIGRE 2008
    CityParis
    Period08/8/2408/8/29

    Fingerprint

    Low density polyethylenes
    Insulation
    Nanocomposites
    Fillers
    Insulating materials
    Depolarization
    Electric fields
    Partial discharges
    Electric potential
    Electric space charge
    Erosion
    Cables
    Permittivity
    Heating
    Engineers
    Mechanical properties
    Polymers

    Keywords

    • Breakdown Strength
    • Electrical Treeing
    • Magnesium Oxide
    • Nanocomposite
    • Partial Discharge Resistance
    • Polyethylene
    • Relative Permittivity
    • Space Charge
    • Thermally Stimulated Depolarization Current
    • Volume Resistivity

    ASJC Scopus subject areas

    • Electrical and Electronic Engineering

    Cite this

    Nagao, M., Murakami, Y., Murata, Y., Tanaka, Y., Ohki, Y., & Tanaka, T. (2008). Material challenge of MgO/LDPE nanocomposite for high field electrical insulation. In 42nd International Conference on Large High Voltage Electric Systems 2008, CIGRE 2008

    Material challenge of MgO/LDPE nanocomposite for high field electrical insulation. / Nagao, Masayuki; Murakami, Yoshinobu; Murata, Yoshinao; Tanaka, Yasuhiro; Ohki, Yoshimichi; Tanaka, Toshikatsu.

    42nd International Conference on Large High Voltage Electric Systems 2008, CIGRE 2008. 2008.

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Nagao, M, Murakami, Y, Murata, Y, Tanaka, Y, Ohki, Y & Tanaka, T 2008, Material challenge of MgO/LDPE nanocomposite for high field electrical insulation. in 42nd International Conference on Large High Voltage Electric Systems 2008, CIGRE 2008. 42nd International Conference on Large High Voltage Electric Systems 2008, CIGRE 2008, Paris, 08/8/24.
    Nagao M, Murakami Y, Murata Y, Tanaka Y, Ohki Y, Tanaka T. Material challenge of MgO/LDPE nanocomposite for high field electrical insulation. In 42nd International Conference on Large High Voltage Electric Systems 2008, CIGRE 2008. 2008
    Nagao, Masayuki ; Murakami, Yoshinobu ; Murata, Yoshinao ; Tanaka, Yasuhiro ; Ohki, Yoshimichi ; Tanaka, Toshikatsu. / Material challenge of MgO/LDPE nanocomposite for high field electrical insulation. 42nd International Conference on Large High Voltage Electric Systems 2008, CIGRE 2008. 2008.
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    abstract = "Polymeric electrical insulating materials are widely used in various power equipments and cables. Additives and fillers are often adopted to polymeric materials for improving insulating and mechanical properties. Recently, nano-fillers are attracting attentions of many researchers and engineers, since they seem to bring higher potentials for advancement of electrical insulating properties as nanocomposites. This paper reports evaluation results of various insulating properties of a MgO/LDPE nanocomposite, jointly carried out by several organizations, aiming at development of an electrical insulating material for higher DC electric field. The DC breakdown strength and the volume resistivity increased with the addition of MgO nanofillers. The thermally stimulated depolarization current (TSDC) peak that spreads over a wide temperature range was observed in all the MgO/LDPE nanocomposites. Furthermore, by adopting a partial heating method, the wide TSDC peak was resolved into several component peaks and it turned out that one of the peaks was attributed to MgO nano-filler, from which it is suggested that a new trap is generated in the nanocomposites. And it was observed from space charge measurement that addition of MgO nano-fillers suppressed packet-like charges in the nanocomposite. The relative permittivity once decreased slightly by addition of MgO nano-fillers and then increased by more addition of them. The electrical treeing inception voltage increased with increasing MgO nano-filler content and it is also recognized that the tree propagation in the MgO/LDPE nanocomposite was suppressed significantly by the addition of MgO nano-fillers. The partial discharge erosion depth of the MgO/LDPE nanocomposite also becomes smaller than that of base LDPE. It is summarized that addition of a small amount of nano-fillers brought excellent insulating performances of the MgO/LDPE nanocomposite. The MgO/LDPE nanocomposite exhibits promising electrical insulating properties to cope with severe requirements and is expected as a new generation of electrical insulating materials for higher electric field application, especially for DC voltages.",
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    AU - Nagao, Masayuki

    AU - Murakami, Yoshinobu

    AU - Murata, Yoshinao

    AU - Tanaka, Yasuhiro

    AU - Ohki, Yoshimichi

    AU - Tanaka, Toshikatsu

    PY - 2008

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    N2 - Polymeric electrical insulating materials are widely used in various power equipments and cables. Additives and fillers are often adopted to polymeric materials for improving insulating and mechanical properties. Recently, nano-fillers are attracting attentions of many researchers and engineers, since they seem to bring higher potentials for advancement of electrical insulating properties as nanocomposites. This paper reports evaluation results of various insulating properties of a MgO/LDPE nanocomposite, jointly carried out by several organizations, aiming at development of an electrical insulating material for higher DC electric field. The DC breakdown strength and the volume resistivity increased with the addition of MgO nanofillers. The thermally stimulated depolarization current (TSDC) peak that spreads over a wide temperature range was observed in all the MgO/LDPE nanocomposites. Furthermore, by adopting a partial heating method, the wide TSDC peak was resolved into several component peaks and it turned out that one of the peaks was attributed to MgO nano-filler, from which it is suggested that a new trap is generated in the nanocomposites. And it was observed from space charge measurement that addition of MgO nano-fillers suppressed packet-like charges in the nanocomposite. The relative permittivity once decreased slightly by addition of MgO nano-fillers and then increased by more addition of them. The electrical treeing inception voltage increased with increasing MgO nano-filler content and it is also recognized that the tree propagation in the MgO/LDPE nanocomposite was suppressed significantly by the addition of MgO nano-fillers. The partial discharge erosion depth of the MgO/LDPE nanocomposite also becomes smaller than that of base LDPE. It is summarized that addition of a small amount of nano-fillers brought excellent insulating performances of the MgO/LDPE nanocomposite. The MgO/LDPE nanocomposite exhibits promising electrical insulating properties to cope with severe requirements and is expected as a new generation of electrical insulating materials for higher electric field application, especially for DC voltages.

    AB - Polymeric electrical insulating materials are widely used in various power equipments and cables. Additives and fillers are often adopted to polymeric materials for improving insulating and mechanical properties. Recently, nano-fillers are attracting attentions of many researchers and engineers, since they seem to bring higher potentials for advancement of electrical insulating properties as nanocomposites. This paper reports evaluation results of various insulating properties of a MgO/LDPE nanocomposite, jointly carried out by several organizations, aiming at development of an electrical insulating material for higher DC electric field. The DC breakdown strength and the volume resistivity increased with the addition of MgO nanofillers. The thermally stimulated depolarization current (TSDC) peak that spreads over a wide temperature range was observed in all the MgO/LDPE nanocomposites. Furthermore, by adopting a partial heating method, the wide TSDC peak was resolved into several component peaks and it turned out that one of the peaks was attributed to MgO nano-filler, from which it is suggested that a new trap is generated in the nanocomposites. And it was observed from space charge measurement that addition of MgO nano-fillers suppressed packet-like charges in the nanocomposite. The relative permittivity once decreased slightly by addition of MgO nano-fillers and then increased by more addition of them. The electrical treeing inception voltage increased with increasing MgO nano-filler content and it is also recognized that the tree propagation in the MgO/LDPE nanocomposite was suppressed significantly by the addition of MgO nano-fillers. The partial discharge erosion depth of the MgO/LDPE nanocomposite also becomes smaller than that of base LDPE. It is summarized that addition of a small amount of nano-fillers brought excellent insulating performances of the MgO/LDPE nanocomposite. The MgO/LDPE nanocomposite exhibits promising electrical insulating properties to cope with severe requirements and is expected as a new generation of electrical insulating materials for higher electric field application, especially for DC voltages.

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    KW - Partial Discharge Resistance

    KW - Polyethylene

    KW - Relative Permittivity

    KW - Space Charge

    KW - Thermally Stimulated Depolarization Current

    KW - Volume Resistivity

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