Thermally Stimulated Current in Low-density Polyethylene/MgO Nanocomposite  -On the Mechanism of its Superior Dielectric Properties-

Ishimoto, Kazuyuki; Tanaka, Toshikatsu; Ohki, Yoshimichi; Sekiguchi, Y.; Murata, Y.

doi:10.1541/ieejfms.129.97

Cited by 12 publications

(10 citation statements)

References 12 publications

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“…For conventional power cables insulated with cross-linked polyethylene, accumulation of space charge in the insulation is a matter of great concern, especially for their use in de power lines. It has already been confirmed that space charge formation is significantly suppressed in the LDPE/magnesia nanocomposite [4][5][6][7]. In this paper, a pronounced effect of the addition of nm-sized magnesia to LDPE on the suppression of packet-like space charge formation is demonstrated, using single and double layered LDPE sheets and similarly layered LDPE/magnesia nanocomposite sheets.…”

Section: Introductionmentioning

confidence: 53%

“…Various kinds of polymer nanocomposites are attracting much attention as new materials that are potentially applicable to electrical insulation in many parts of electric power apparatus [1][2][3][4][5][6][7][8][9]. Among them, a composite consisting of low-density polyethylene (LDPE) and nm-sized magnesia (MgO) particles has been found by the authors to be superior in various properties for electrical insulation of power cables [4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…Among them, a composite consisting of low-density polyethylene (LDPE) and nm-sized magnesia (MgO) particles has been found by the authors to be superior in various properties for electrical insulation of power cables [4][5][6][7][8][9]. For conventional power cables insulated with cross-linked polyethylene, accumulation of space charge in the insulation is a matter of great concern, especially for their use in de power lines.…”

Section: Introductionmentioning

confidence: 99%

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Suppression of packet-like space charge formation in LDPE by the addition of magnesia nanofillers

Ohki

Ishimoto

Kanegae

et al. 2009

2009 IEEE 9th International Conference on the Properties and Applications of Dielectric Materials

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Space charge distributions were investigated in two-layer dielectric films consisting of certain combinations of low-density polyethylene (LDPE) and its nanocomposite with magnesia nanofillers at de electric fields of 25 kV/mm and 100 kV/mm at room temperature. Space charge is formed at the interface of two different materials to maintain the continuity of current when the electric field is 25 kV/mm, while packet-like charge appears only in the LDPE at 100 kVImm. These phenomena are explained by assuming that the nanofillers effectively suppress the increase in conductivity induced by the high electric field. Related work done previously by the authors is also briefly reviewed.

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Section: Introductionmentioning

confidence: 53%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Suppression of packet-like space charge formation in LDPE by the addition of magnesia nanofillers

Ohki

Ishimoto

Kanegae

et al. 2009

2009 IEEE 9th International Conference on the Properties and Applications of Dielectric Materials

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“…There have been a number of studies of the mechanisms underlying the low space charge accumulation and high volume resistivity. For example, Ishimoto and colleagues measured thermally stimulated currents in polyethylene-based nanocomposites and pointed out the possibility that the nanoparticles formed new trap levels, thus strongly constraining the space charge [11]. Maezawa and colleagues proposed a new mechanism in which nanoparticles act as deep trap sites by forming potential wells [12].…”

Section: Fef =mentioning

confidence: 99%

Practical Application of ±250‐kV DC‐XLPE Cable for Hokkaido–Honshu HVDC Link

Watanabe

Itou

Sasaki

et al. 2015

Electrical Engineering Japan

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SUMMARY The long‐term dc properties of DC‐XLPE insulation materials, which have been developed for dc use, were investigated. It was found that the lifetime of DC‐XLPE under dc voltage application is extended by the addition of nano‐sized filler. The time dependence of the space charge distribution at 50 kV/mm was observed for 7 days. Almost no accumulation of space charge in DC‐XLPE was found. The 250‐kV DC‐XLPE cables and accessories were manufactured and subjected to a type test and PQ test for use in the Hokkaido–Honshu dc link facility owned by the Electric Power Development Co., Ltd. These tests were performed under conditions that included a polarity reversal test for line commutated converter (LCC) systems as recommended in CIGRE TB 219. The test temperature was 90 °C. The type test and PQ test were successfully completed. The DC‐XLPE cable and accessories were installed in summer 2012 for the Hokkaido–Honshu dc link. After the installation of the dc extruded cable system, a dc high‐voltage test at 362.5 kV (=1.45 PU) for 15 min was successfully completed in accordance with CIGRE TB 219. This dc extruded cable system was put into operation in December 2012 as the world's highest‐voltage extruded dc cable in service and the world's first dc extruded cable for a LCC system including polarity reversal operation.

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“…The temperatures at the TDSC peaks are close to T g 's for both PET and PEN. Therefore, TSDCs in PET and PEN are due to the dipolar orientation induced by the segmental mode relaxation that becomes possible by the glass transition [9,10], as in the cases of other polymers [11][12][13].…”

Section: Tspc and Tsdcmentioning

confidence: 99%

Dielectric properties of poly(ethylene terephthalate) and poly(ethylene 2,6-naphthalate)

Yang

Tian

Ohki

2014

IEEE Trans. Dielect. Electr. Insul.

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Dielectric behavior was compared experimentally between polyethylene terephthalate (PET) and poly(ethylene 2,6-naphthalate) (PEN). Due to their similar chemical structures, the two polymers exhibit many parallel dielectric properties. While the two polymers exhibit fairly similar thermally stimulated polarization and depolarization currents (TSPC and TSDC), the temperature at which TSPC or TSDC starts to increase rapidly is about 20 ºC higher in PEN than in PET, mostly likely reflecting the difference in their glass transition temperatures (T g 's). At temperatures about 30 ºC lower than T g , the two polymers show a hump in their first-run TSPC spectra, probably originating from impurity or moisture. Both the real and imaginary parts of complex permittivity, r ' and r" , increase significantly at temperatures above their T g 's for both PEN and PET, since molecular motion becomes active. Shoulders and plateaux clearly appear in r ' and r" spectra of PEN, which move toward higher frequencies with an increase in temperature. To further analyze them, complex electric modulus M* was introduced. As a result, it has become clear that electric conduction dominates the dielectric behavior of PET and PEN at temperatures above T g , especially at low frequencies.

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Thermally Stimulated Current in Low-density Polyethylene/MgO Nanocomposite -On the Mechanism of its Superior Dielectric Properties-

Cited by 12 publications

References 12 publications

Suppression of packet-like space charge formation in LDPE by the addition of magnesia nanofillers

Suppression of packet-like space charge formation in LDPE by the addition of magnesia nanofillers

Practical Application of ±250‐kV DC‐XLPE Cable for Hokkaido–Honshu HVDC Link

Dielectric properties of poly(ethylene terephthalate) and poly(ethylene 2,6-naphthalate)

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