Space charge and steady state current in LDPE samples containing a permittivity/conductivity gradient
Electromagnetic theory predicts that a dielectric sample in which a steady DC current of density /spl epsiv/ is flowing, and in which the ratio of permittivity /spl epsiv/ to conductivity /spl sigma/ varies with position, will acquire a space charge density j/spl middot/grad(/spl epsiv///spl sigma/)...
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Published in | 2000 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.00CH37132) Vol. 1; pp. 381 - 384 vol.1 |
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Main Authors | , , |
Format | Conference Proceeding |
Language | English |
Published |
IEEE
2000
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Abstract | Electromagnetic theory predicts that a dielectric sample in which a steady DC current of density /spl epsiv/ is flowing, and in which the ratio of permittivity /spl epsiv/ to conductivity /spl sigma/ varies with position, will acquire a space charge density j/spl middot/grad(/spl epsiv///spl sigma/). A simple and convenient way to generate an /spl epsiv///spl sigma/ gradient in a homogeneous sample is to establish a temperature gradient across it. The resulting spatial variation in /spl epsiv/ is usually small in polymeric insulators, but the variation in /spl sigma/ can be appreciable. Laser induced pressure pulse (LIPP) measurements were made on 1.5 mm thick plaques of ultra pure LDPE equipped with vacuum-evaporated aluminium electrodes. Temperature differences up to 27/spl deg/C were maintained across the samples, which were subjected to DC fields up to 20 kV/mm. Current density was measured as a function of temperature and field. Negligible thermally generated space charge was observed. The charge carrier mobility in the bulk of the samples was estimated to be of order 10/sup -8/ cm/sup 2/ V/sup -1/ s/sup -1/. |
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AbstractList | Electromagnetic theory predicts that a dielectric sample in which a steady DC current of density /spl epsiv/ is flowing, and in which the ratio of permittivity /spl epsiv/ to conductivity /spl sigma/ varies with position, will acquire a space charge density j/spl middot/grad(/spl epsiv///spl sigma/). A simple and convenient way to generate an /spl epsiv///spl sigma/ gradient in a homogeneous sample is to establish a temperature gradient across it. The resulting spatial variation in /spl epsiv/ is usually small in polymeric insulators, but the variation in /spl sigma/ can be appreciable. Laser induced pressure pulse (LIPP) measurements were made on 1.5 mm thick plaques of ultra pure LDPE equipped with vacuum-evaporated aluminium electrodes. Temperature differences up to 27/spl deg/C were maintained across the samples, which were subjected to DC fields up to 20 kV/mm. Current density was measured as a function of temperature and field. Negligible thermally generated space charge was observed. The charge carrier mobility in the bulk of the samples was estimated to be of order 10/sup -8/ cm/sup 2/ V/sup -1/ s/sup -1/. |
Author | Fleming, R.J. Bambery, K.R. Holboll, J.T. |
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Snippet | Electromagnetic theory predicts that a dielectric sample in which a steady DC current of density /spl epsiv/ is flowing, and in which the ratio of permittivity... |
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StartPage | 381 |
SubjectTerms | Conductivity Dielectrics Optical pulses Permittivity Plastic insulation Polymers Pulse measurements Space charge Steady-state Temperature |
Title | Space charge and steady state current in LDPE samples containing a permittivity/conductivity gradient |
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