Caractérisation électrique d'un condensateur haute-tension sec

Abstract

Condis, one of the leaders in high voltage capacitors, annually manufactures 16,500 products per year. For decades, manufacturing technology has not changed and requires more than 60% manual operations. Additionally, manufactured capacitors use synthetic oils as a dielectric wall. These oils have a detrimental effect on the environment and new ecological regulations could prohibit their use. Therefore, a technological revolution is required in order to offer dry capacitors, without oil, with flexibility of automation, an improvement in manufacturing time and above all being able to operate in a weak manner at the electric fields typical for HV capacitors (a few dozen of kV / mm). The general objective of this work is to electrically characterize the partial discharge (PD) signatures in high voltage dry capacitors and to model the phenomenon of PD inside these capacitors. In order to achieve this objective, the electrical and dielectric characterization of high voltage dry capacitors was carried out in order to evaluate the factors influencing the appearance of faults in high voltage dry capacitors in order to make recommendations to reduce the presence of faults in these capacitors. The imagined solution combines part of the know-how of Condis with regard to the manufacture of thin coils and the know-how of ETS for the search for an optimization of processes and materials. This new manufacturing process has improved the manufacturing technology of high voltage capacitors. Thus, PD profiles have been identified in high voltage dry capacitors, technological solutions have been proposed and interpreted in order to decrease PD in high voltage dry capacitors and recommendations have been made to improve the manufacturing process of high voltage capacitors. Existing theories regarding high voltage capacitors have been discussed as well as detailed information regarding the different possible sources, partial discharge measurement techniques, impregnation techniques, as well as different impregnants and dielectric materials have also been presented in this work.

Date	29 Nov 2021
Original language	French
Awarding Institution	École de technologie supérieure
Supervisor	Éric David (Supervisor) & Ioana Preda (Co-supervisor)