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Space charge distribution measurement methods and particle loaded insulating materials
S. Holé1, A. Sylvestre2, Olivier Gallot-Lavallée2, C. Guillermin3, P. Rain2, S. Rowe3

In this paper the authors discuss the effects of particles (fillers) mixed in a composite polymer on the space charge measurement techniques. The origin of particle-induced spurious signals is determined and silica filled epoxy resin is analysed by using the laser-induced-pressure-pulse (LIPP), the pulsed-electroacoustic (PEA) and the laser-induced-thermal-pulse (LITP) methods. A spurious signal identified as the consequence of a piezoelectric effect of some silica particles is visible for all the methods. Moreover, space charges are clearly detected at the epoxy/silica interface after a 10-kV/mm poling at room temperature for 2 hours.
1 :  LISIF - Laboratoire des Instruments et Systèmes d'Ile de France
2 :  G2ELab - Laboratoire de Génie Electrique de Grenoble
3 :  SE - Schneider Electric SA
PEA – Space charge