Mesures de charge d'espace par FLIMM : Derniers développements

Laurent Berquez (1) , Amanda Salazar-Velazquez (1) , Didier Marty-Dessus (1)

1 LAPLACE-DSF - Diélectriques Solides et Fiabilité

Reliability and proper functioning of electrical devices heavily rely on electrical and chemical properties of insulation they are made of. Thus, a common cause of failure of such systems is related to the dielectric breakdown of materials. Although these materials show a natural threshold beyond which a breakdown can occur, other extrinsic sources exist and contribute to their premature ageing, leading to an abnormal acceleration of the degradation process. These external sources can be multiple and of very different origins, but their cumulative effects converge to create an unexpected internal electric field whose local strengths can often be lower than the theoretical breakdown value of a “perfect” insulating material. This field is directly the result of charge accumulations, globally known as “space charge”. The characterization of space charge distributions in terms of nature, amount and spatial or temporal evolution is of major importance to predict future behaviors, in particular ageing. Our laboratory has been developing for several years of non-destructive measurement technique for such investigations. Called FLIMM (Focused Laser Intensity Modulation Method), this experimental bench has evolved during the last years, offering today new possibilities and trying to fill the gap between classical abilities and new demand of private R&D. The aim of this paper is to describe and explain these main evolutions.

Domaines: Sciences de l'ingénieur [physics]

Laurent Berquez, Amanda Salazar-Velazquez, Didier Marty-Dessus. Mesures de charge d'espace par FLIMM : Derniers développements. 7ème Colloque Interdisciplinaire en Instrumentation, Jan 2016, Saint-Nazaire, France. ⟨hal-01280212⟩