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	DEVELOPMENT OF COMMUTATION AND FILTER CAPACITORS FOR POWER ELECTRONICS	[View]   [Download]
Author(s)	M. Bramoulle
Abstract	Since the start of Power Electronics, capacitors volume reduction has always been considered as a permanent target. This performance is reached through 3 lines of development: - new conceptions for the architecture of the electronic circuits, - emergence of new components (GTO thyristors), - actions on the technical design of the capacitors. This paper shows the ways and means employed to develop these actions: - reduction of the dielectric losses, - increase of the working voltage stresses, - increase of the specific energy, while preserving the necessary level of reliability of these capacitors. The evolution of the impregnated commutation capacitors is based on an improvement of the dielectric system, inducing to a very large reduction of the dielectric losses. In the range of the unimpregnated capacitors, the use of metallized film, with a reinforced side, without crenels for commutation, and with crenels for filter applications, gives a better control of the self-healing phenomena and allows to increase the working stresses. Unfortunately, the performances of the basic products, like the polypropylène film, remain constant and the working conditions draw more and more near the unchanged limits of the films. Therefore, it is important to know precisely the real working conditions of these capacitors.
Download	Filename: Unnamed file Filesize: 2.062 MB
Type	Members Only
Date	Last modified 2021-03-15 by System