Dielectric Properties and Morphology in Polyethylene

Yahagi, Kichinosuke

doi:10.1109/tei.1980.298316

Cited by 60 publications

(23 citation statements)

References 14 publications

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“…Therefore, it is suggested that the structure of small crystal size and dense amorphous parts may be of higher breakdown strength, because this structure can lead to the very small void size. This agrees with other author's argument [5]. Moreover, as small voids may increase the trap distance and reduce the interactions between the trap barrier potentials [11], the practical situation should be much more complicated.…”

Section: Discussionsupporting

confidence: 89%

“…For example, the results of some authors' experiments [3,6] that the breakdown strength decreased with the increase of crystallinity seem contradict with other authors' experiments showing that the breakdown strength increased with the material density [4,5]. This difference may be related to the detailed microstructure, such as the crystal size [5] and nano-void concentration distribution [10] etc. However, up to now, there is still no theoretical method to analyze the effect of morphology on breakdown strength.…”

Section: Introductionmentioning

confidence: 83%

“…may lead to the change in electrical breakdown strength [1][2][3][4][5][6][7][8][9][10]. However, the roles of crystalline and amorphous parts and their orientation have not been known clearly.…”

Section: Introductionmentioning

confidence: 99%

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Investigation on the correlation between morphology and electrical breakdown in insulating polymers by using the percolation model

Okamoto

Suzuoki³

CEIDP '05. 2005 Annual Report Conference on Electrical Insulation and Dielectric Phenomena, 2005.

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On the basis of the percolation model for electrical breakdown, a theoretical approach was proposed to investigate the correlation between morphology and breakdown strength. By introducing the sites of micro-voids in the percolation model, the effect of free volume was reflected and the morphology change was expressed by the aggregation pattern and the orientation of voids. Monte-Carlo simulation confmed that the breakdown strength decreases with the increase of free volume, changes with the void shape and size distribution, and can be improved by orientation.

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Section: Discussionsupporting

confidence: 89%

Section: Introductionmentioning

confidence: 83%

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Investigation on the correlation between morphology and electrical breakdown in insulating polymers by using the percolation model

Okamoto

Suzuoki³

CEIDP '05. 2005 Annual Report Conference on Electrical Insulation and Dielectric Phenomena, 2005.

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“…It is well known that PE conductive properties are conditioned by its morphology [1][2][3][4][5][6][7][8] and that insulation degradation can be related to volume space charges [9]. Particularly, conduction and space charge formation in low-density PE were studied including the interval of temperatures of interest for cable diagnostics [10].…”

Section: Article In Pressmentioning

confidence: 99%

Effect of annealing on conductivity in XLPE mid-voltage cable insulation

Frutos

Acedo

Mudarra

et al. 2007

Journal of Electrostatics

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“…In industrial applications, crosslinked PE (XLPE) is commonly used as an electrical insulator due to its outstanding insulating characteristics and its low price. It is well known that PE conductive properties are conditioned by its morphology [1][2][3] and that insulation degradation can be related to volume space charges [4]. Particularly, conduction and space charge formation in low-density PE were studied including the interval of temperatures of interest for cable diagnostics [5].…”

Section: Introductionmentioning

confidence: 99%

Annealing effect on the conductivity of XLPE insulation in power cable

Diego

Belana

Orrit

et al. 2011

IEEE Trans. Dielect. Electr. Insul.

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Conductivity () in XLPE insulation of power cables annealed at 90 ºC at temperatures between 50 and 97 ºC has been measured. In all cases there is an initial increase in conductivity that develops a maximum and finally decreases for long annealing times. This maximum appears in the sample annealed 20 days when conductivity is measured at 50 ºC and shifts gradually to higher annealing times up to 40 days when the measurement is performed at 97 ºC. A linear behavior of ln() versus T -1/4 is observed, which implies that the transport mechanism is basically via thermally assisted hopping conduction. Infrared spectroscopy indicates that, during annealing, some chemical species diffuse from the semiconducting shields (SC) into the XLPE. Thermally stimulated depolarization currents technique (TSDC) and intensity-current measurements (I-V) point out as well the presence of this diffusion process that becomes less significant after long annealing times. The initial increase in  is explained in terms of the increase in traps density due to the diffusion process from the SC shields. Long term decrease in  is justified by the observed decrease of diffusion rate for long annealing times.

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Dielectric Properties and Morphology in Polyethylene

Cited by 60 publications

References 14 publications

Investigation on the correlation between morphology and electrical breakdown in insulating polymers by using the percolation model

Investigation on the correlation between morphology and electrical breakdown in insulating polymers by using the percolation model

Effect of annealing on conductivity in XLPE mid-voltage cable insulation

Annealing effect on the conductivity of XLPE insulation in power cable

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