Treeing breakdown phenomena in MgO/LDPE nanocomposite material

Kawano, Masato; Murakami, Yoshinobu; Nagao, Masayuki; Sekiguchi, Y.; Reddy, C. C.; Murata, Y.

doi:10.1109/icpadm.2009.5252202

Cited by 4 publications

(3 citation statements)

References 4 publications

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“…Improved tracking resistance has also been achieved in nanodielectrics, by enhancing thermal conductivity [9,19], stability of the chains [7], surface charge dissipation [20], etc. Among various nanofillers, MgO was found to be an effective nanofiller for inhibiting the space charge [21], treeing breakdown, and partial discharge [22]. Cross linked polyethylene (XLPE)/MgO nanocomposite material has been employed as the insulation for 500 kV DC cable, developed in Japan, due to its excellent electrical performance [23].…”

Section: Introductionmentioning

confidence: 99%

Surface Tracking of MgO/Epoxy Nanocomposites: Effect of Surface Hydrophobicity

Xing

Zhang

et al. 2019

Applied Sciences

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Surface tracking has been one of the challenges for outdoor organic insulations, in electronic and electrical devices. In this paper, surface tracking behavior of nano-MgO/epoxy composite samples were measured according to the standard IEC 60112. Improved tracking resistance was obtained in nanocomposites with an 18.75% uplift in the comparative tracking index, and a decrease of 58.20% in the surface ablation area at a fixed 425 V. It was observed that the tracking resistance and surface hydrophobicity shared the same tendency—both, the comparative tracking index and surface contact angle increased with an increase of the nanofiller content. Samples with better hydrophobicity exhibited a higher tracking resistance. It could be the case that the conductive pathway of contamination was harder to form, as a result there were fewer discharging processes. With the development of surface tracking, the surface contact angle abruptly decreased, at first, and tended to be constant, which was also accomplished with the failure of samples. In addition, reduced surface resistivity was also found in the nanocomposites, which was beneficial for releasing surface charges and inhibiting distortions in the electric fields.

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Section: Introductionmentioning

confidence: 99%

Surface Tracking of MgO/Epoxy Nanocomposites: Effect of Surface Hydrophobicity

Xing

Zhang

et al. 2019

Applied Sciences

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“…Kawano et al performed a similar study on the influence of MgO on the initiation and development of electric trees in nanocomposites [229]. The statistical analysis revealed that 63.2% of the respective tree inception voltages were 4.44, 4.60, 4.95 and 5.66 kV rms for LDPE/MgO samples with 0, 1, 5 and 10 wt % of MgO content: The tree inception voltage increased with increasing nanofiller content [229]. Tanaka et al tested LDPE/MgO samples with filler contents of 1, 2, 5 and 10 wt % at voltage frequencies of 60 and 600 Hz [230].…”

Section: Electrical Treeing In Nanocompositesmentioning

confidence: 99%

Polyethylene Nanocomposites for Power Cable Insulations

et al. 2018

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This review represents a comprehensive study of nanocomposites for power cables insulations based on thermoplastic polymers such as polyethylene congeners like LDPE, HDPE and XLPE, which is complemented by original results. Particular focus lies on the structure-property relationships of nanocomposites and the materials’ design with the corresponding electrical properties. The critical factors, which contribute to the degradation or improvement of the electrical performance of such cable insulations, are discussed in detail; in particular, properties such as electrical conductivity, relative permittivity, dielectric losses, partial discharges, space charge, electrical and water tree resistance behavior and electric breakdown of such nanocomposites based on thermoplastic polymers are described and referred to the composites’ structures. This review is motivated by the fact that the development of polymer nanocomposites for power cables insulation is based on understanding more closely the aging mechanisms and the behavior of nanocomposites under operating stresses.

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“…Recently, progress has been made towards the wide experimental observation of nanosize particle fillers in suppressing the growth of electrical treeing, such as SiO 2 , MgO and ZnO [23][24][25][26][27][28][29][30][31], together with the analysis and explanation for the potential role of nanocomposite additives [32][33][34]. As is well known, the addition of nanoparticles has a major influence on the electronic properties of the interfacial region between them and the polymer matrix, which could result in the charge redistribution of the system or probably be accompanied by cleavage and formation of a chemical bond.…”

Section: Introductionmentioning

confidence: 99%

A density functional theory study of the role of functionalized graphene particles as effective additives in power cable insulation

et al. 2018

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The role of a series of functionalized graphene additives in power cable insulation in suppressing the growth of electrical treeing and preventing the degradation of the polymer matrix has been investigated by density functional theory calculations. Bader charge analysis indicates that pristine, doped or defect graphene could effectively capture hot electrons to block their attack on cross-linked polyethylene (XLPE) because of the π–π conjugated unsaturated structures. Further exploration of the electronic properties in the interfacial region between the additives and XLPE shows that N-doped single-vacancy graphene, graphene oxide and B-, N-, Si- or P-doped graphene oxide have relatively strong physical interaction with XLPE to restrict its mobility and rather weak chemical activity to prevent the cleavage of the C–H or C–C bond, suggesting that they are all potential candidates as effective additives. The understanding of the features of functionalized graphene additives in trapping electrons and interfacial interaction will assist in the screening of promising additives as voltage stabilizers in power cables.

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Treeing breakdown phenomena in MgO/LDPE nanocomposite material

Cited by 4 publications

References 4 publications

Surface Tracking of MgO/Epoxy Nanocomposites: Effect of Surface Hydrophobicity

Surface Tracking of MgO/Epoxy Nanocomposites: Effect of Surface Hydrophobicity

Polyethylene Nanocomposites for Power Cable Insulations

A density functional theory study of the role of functionalized graphene particles as effective additives in power cable insulation

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