Space charge measurement in XLPE cable with temperature gradient through the insulation

Fu, Mingli; Chen, G.

doi:10.1109/ceidp.2003.1254832

Cited by 5 publications

(3 citation statements)

References 8 publications

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“…However, most of such research work was conducted at room temperature while space charge dynamics in XLPE under dc electric stress at different temperatures has only received limited attention [1][2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Temperature effect on space charge dynamics in XLPE insulation

Chong

Chen

2007

IEEE Trans. Dielect. Electr. Insul.

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This paper reports on space charge evolution in crosslinked polyethylene (XLPE) planar samples approximately 1.20 mm thick subjected to electric stress level of 30 kV dc /mm at four temperatures 25, 50, 70 and 90 o C for 24 h. Space charge profiles in both asreceived and degassed samples were measured using the laser induced pressure pulse (LIPP) technique. The dc threshold stresses at which space charge initiates are greatly affected by testing temperatures. The results suggest that testing temperature has numerous effects on space charge dynamics such as enhancement of ionic dissociation of polar crosslinked by-products, charge injection, charge mobility and electrical conductivity. Space charge distributions of very different nature were seen at lower temperatures when comparing the results of as-received samples with degassed samples. However at higher temperature, the space charge distribution took the same form, although of lower concentration in degassed samples. Space charge distributions are dominated by positive charge when tested at high temperatures regardless of sample treatment and positive charge propagation enhances as testing temperature increases. This can be a major cause of concern as positive charge propagation has been reported to be related to insulation breakdown.

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Section: Introductionmentioning

confidence: 99%

Temperature effect on space charge dynamics in XLPE insulation

Chong

Chen

2007

IEEE Trans. Dielect. Electr. Insul.

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“…3 oven was controlled by a temperature controller. All samples were held at the set temperature for 1 h before any space charge measurements were taken.…”

Section: Measurement Protocolmentioning

confidence: 99%

“…This leads to a local field enhancement within the material that may cause insulation degradation and ultimately, electrical breakdown. However, most of such work was conducted at room temperature while space charge dynamics in insulation under dc electric stress at different temperatures has only received limited attention [1][2][3][4][5][6][7][8][9][10][11][12][13].The main objective of the present study is to provide a better understanding about the mechanisms responsible for space charge accumulation when a temperature is present across the insulation. To that purpose, we performed space charge measurements at different temperature, at both positive and negative polarity of the test voltage.…”

Section: Introductionmentioning

confidence: 99%

Temperature effect on space charge dynamics in multi-layer insulation Fluorinated Ethylene Propylene (FEP) Low Density Polyethylene (LDPE)

Rogti

Ferhat

2013

2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena

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Space charge behavior at dielectric interfaces in multi-layer Fluorinated Ethylene Propylene (FEP) and Low Density Polyethylene (LDPE) subjected to a dc field has been investigated as a function of the temperature using the pulsed electro acoustic (PEA) technique.A sandwich structure constituted by two dielectric films not identical FEP/LDPE was used to study the charging propensity of electrode/dielectric and dielectric/ dielectric interface. The time dependence of the space charge distribution was subsequently recorded at different temperature under field (polarization) and short circuit condition (depolarization). Experimental results demonstrated that charge injected process take place in all cases. However it is shown that the amount of interfacial charge depends drastically on the temperature. It has greater influence on the distribution, injection and mobility of space charge in the bulk and at dielectric/ dielectric interfaces.

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