Characteristics of Polyethylene Impregnated with Various Gases

Kojima, Toshihiro; Hanai, M.; Yagi, K.; Okusa, Kitao; Aihara, M.; Haga, K.

doi:10.1109/tpas.1974.294006

Cited by 11 publications

(3 citation statements)

References 4 publications

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“…Reducing the action of high energy electrons by impregnating with SF6, which captures some electrons, may improve the electrical treeing properties. The present results together with those presented by others [5] confirmed that the process of bonds breaking by injected carriers plays an important role during the initiation of tree in LDPE.…”

Section: Resultssupporting

confidence: 91%

“…Several approaches to suppress the tree initiations from the voids in polyethylene have been reported. One of the effective approaches is employing high hydrostatic pressure [4], and a more effective approach is impregnating the polyethylene insulation with electronegative gases such as SF6 and C4Fg [5]. The diffusion and dissolution of electronegative gas into polyethylene cause a significant increase of treeing inception voltage.…”

Section: Introductionmentioning

confidence: 99%

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Electrical treeing properties of polyethylene degassed and impregnated with SF/sub 6/

Xie

Vester

Gockenbach

et al.

[1991] Proceedings of the 3rd International Conference on Properties and Applications of Dielectric Materials

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The electrical treeing properties of low density polyethylene (LDPE) degassed and SFg-i~npregnated have been studied for a needle-plane configuration. The experimental results show that the electrical treeing properties of LDPE can be improved by impregnating with SF6, depending on the impregnating pressure and duration, i.e.,the amount of SF6 dissolved in LDPE, and improved more remarkably by degassing in a vacuum of 10-6 bar for 170 h. Degassed and then SFg-impregnated LDPE gives the best electrical treeing properties.On the basis of the new results, a model for tree inception and propagation of polyethylene in divergent field is proposed which suggest that the initiation of tree is due to the breakage of bonds of polyethylene chain by injected high energy charge carriers and the rapid reaction between energy-enriched singlet oxygen and polyethylene. Therefore reducing the action of injected high energy electrons by impregnating with sF6, and decreasing the concentration of oxygen in polyethylene can inhibit the initiation and the propagation of tree. The model is consistent with all the experimental results.

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Section: Resultssupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Electrical treeing properties of polyethylene degassed and impregnated with SF/sub 6/

Xie

Vester

Gockenbach

et al.

[1991] Proceedings of the 3rd International Conference on Properties and Applications of Dielectric Materials

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show abstract

“…While it was known that gas impregnation of polyethylene could produce moderate improvement in dielectric strength (1), it was anticipated that more dramatic improvement could be obtained with liquid impregnation, hopefully achieving virtually complete elimination of all free void space. This was based upon the assumption that a liquid-filled microspace might exhibit much higher breakdown level than gas-filled cavities.…”

Section: Impregnation Considerationsmentioning

confidence: 99%

Investigation of mechanism of breakdown in XLPE cables. Final report

McKean¹

1976

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This report was prepared pursuant to an act of Congress. Publication of the findings and recommendations herein should not be construed as representing either the approval or disapproval of the Energy Research and Development Administration. The purpose of this report is to provide information and alternatives for further consideration by the Energy Research and Development Administration and other federal agencies.

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Aging of polymeric insulating materials in power cables

Mayoux

1997

IEEE Trans. Dielect. Electr. Insul.

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Characteristics of Polyethylene Impregnated with Various Gases

Cited by 11 publications

References 4 publications

Electrical treeing properties of polyethylene degassed and impregnated with SF/sub 6/

Electrical treeing properties of polyethylene degassed and impregnated with SF/sub 6/

Investigation of mechanism of breakdown in XLPE cables. Final report

Aging of polymeric insulating materials in power cables

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