Free energy variation due to a space charge formation

Moya-Siesse, D.; Moya, G.; Gressus, C. Le

doi:10.1109/ceidp.1993.378989

Cited by 3 publications

(1 citation statement)

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“…The huge mechanical contribution explains that a charged dielectric has an internal energy reservoir that is able in case of energy relaxation to trigger breakdown and mechanical fractures. This energy reservoir causes the increase of the specific heat (6) and therefore, the infrared spectroscopy line energy shifts (7).…”

Section: Space Charge Physicmentioning

confidence: 99%

Space charge characterisation. The state of art and further needs

Gressus

Proceedings of 1995 Conference on Electrical Insulation and Dielectric Phenomena

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Due to the lack of physical background it is still a question to know if the space charge is the cause or the consequence of breakdown and ageing phenomena. However, an elegant method based on Raman spectroscopy and infrared spectroscopy had shown (1978) the directions to follow and ingredients were there for explaining these phenomena from dielectric processes. Several space charge characterisation techniques have been developed for various applications. Optical methods and methods using electron beams and electron spectrometers have brought a significant contribution. Particularly, they have allowed to understand that the characterisation requires more that the investigation of the space charge distribution. It requires to determine the maximum energy that a charged dielectric can store before the occurrence of any energy relaxation process. The work will fmt emphasise the importance of welldefined materials for verifying theoretical results. The control of the various space charge steps: injection, propagation and relaxation, is an experimental key point.

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Section: Space Charge Physicmentioning

confidence: 99%