Defense of a doctoral thesis of GILLETTE Laurane, for the University Grenoble Alpes , speciality "OPTIC and RADIOFREQUENCIES ", entitled:
Room Amphi Pôle Montagne- University Savoie Mont-Blanc Campus scientifique du Bourget-du-Lac 73370-Le Bourget-du-Lac
«Contact-less and and vectorial measurement system for low frequency voltage characterization in industrial environment»
Thursday, October 27, 2016 at 10:00
The aim of this work is to propose the proof of concept, the experimental validation and the realization of electric field measurement system for the characterization of cables (single or multicore) or low frequency voltage equipment in industrial environment. The problematic are the energy diagnostics and high voltage device characterization. The developed system allows a contact-less vector measurement of the fields radiated by drivers without requiring the interruption of the production chain. The measurements are made in real time and allow to obtain information about the voltage, the phase or the positions of the conductors in a cable. Two different technologies are proposed to address this problem. The first developed technology is based on the Pockels effect and leads to the realization of an electro optic probe totally dielectric and non invasive for the measurement. This electro optic probe allows, depending on the configuration, to measure the three components of the electric field. This technology is used, mainly, for high voltage applications. A second technology, based on electric sensors, is suitable for the industrial’s expectations in terms of cost. It is used for low voltage applications such as electric diagnostics voltage cables. A complementary study has been developed to propose a wattmeter clamp. Thus, a technology allowing to measure the magnetic field has been implemented. This development is also contact-less and provides information on the current in order deduce information on power. The electro-optical system has allowed characterization of high-voltage systems such as cables, insulators or switchgear gas-insulated (GIS). The electrical system (wattmeter clamp) offers a complete characterization of power cable : position of drivers, voltage drivers, current, phase, harmonic detection or measurement of partial discharge.
Members of the jury : -M. Gwenaël Gaborit , Supervisor -Mme Nadège Courjal , Reviewer -M. Alain Xémard , Reviewer -M. Olivier Lesaint , Examiner -M. Christophe Volat, Examiner -M. Jean Louis Coutaz, Examiner -Mme Valérie Murin, Guest -M. Lionel Duvillaret, Guest
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Thesis prepared in the laboratory: UMR 5130 - IMEP-LAHC (Institut de Microélectronique,Electromagnétisme, Photonique – Laboratoire Hyperfréquences et Caractérisation) supervised by M.Gwenael GABORIT.