Review and improvement of a method for measuring losses in the dielectric materials by calorimetry

Elysée Obame Ndong (1) , Frédéric Aitken (1) , Olivier Gallot-Lavallée (1)

1 G2ELab - Laboratoire de Génie Electrique de Grenoble

The power loss plays a significant role in the design, implementation and use components in power electronics. It is therefore important to be able to characterize them using techniques reliable and preferably in the nominal operating conditions. The calorimetric principle seems to be particularly suited to the full characterization of losses. The calorimetric studied in this article was specifically designed to measure the losses in power capacitors. We offer a comprehensive analytical study heat exchange. The surfaces of the calorimetric device are considered insulated, gray, opaque and perfectly diffuse. The exterior wall is supposed adiabatic. The temperature gradients highlighted by this model and the response of the device in case tests show weaknesses in the system. The result is a degradation of measurement accuracy. This could, however, be improved by encouraging exchanges by radiation and using a single temperature regulator. This is the subject of an ongoing study.

Mots clés: Calorimetry; Dielectric; Emissivity; Losses; Modeling; Radiation

Domaines: Matériaux

Elysée Obame Ndong, Frédéric Aitken, Olivier Gallot-Lavallée. Review and improvement of a method for measuring losses in the dielectric materials by calorimetry. 5th International Conference on Broadband Dielectric Spectroscopy and its Applications (BDS), Aug 2008, Lyon, France. ⟨hal-00334496⟩