A seminar by Prof. Leonard A. Dissado - Emeritus Professor, University of Leicester (UK)
Date: 29 MAY 2019 from 11:30 to 13:00
Event location: Aula 7.8 - Edificio Ex-Sirani - Via Saragozza, 8 Bologna
Type: Seminar
Electrical trees are a major form of pre-breakdown degradation in polymeric insulators that lead inevitably to eventual breakdown. The physical form of the phenomena and the way that they cause breakdown is described. The processes that cause their initiation and propagation are examined and the basic physics presented. The way that deterministic chaos is involved in controlling the tree shape is determined from both experiment and theory. The effect of moisture and temperature upon tree development is described from this viewpoint. It is pointed out that a minimum local field is required for the continued propagation of the tree and that the final stage of tree propagation is a runaway when the tree tip field increases indefinitely with further growth.
Leonard A Dissado, BSc, PhD, DSc, FIEEE is a Professor Emeritus with the University of Leicester UK. He is the co-author of the book Electrical degradation and Breakdown in Polymers and has published more than 330 papers, of which more than 250 are on electrical degradation and dielectric spectroscopy. He has been a visiting professor at universities in Australia, Italy, France, Japan, China, and the USA. He has given numerous invited lectures, including the E.O.Forster (ICSD 2001) and the Whitehead (CEIDP 2002) memorial lectures, and received the award of Doctuer Honoris Cause from the University of Toulouse, Honorary Professor from Xi’an Jiaotong University China, and the Dakin Award of the IEEE DEIS. He is currently a member of the DEIS Publications Committee.