INFLUENCE OF LOW-CONDUCTIVE COATING ON INSULATION SYSTEM OF ROTARY ELECTRIC MACHINE

Petr Mráz – Vladimír Kindl – Karel Hruška

   The discharge activity is well-known phenomenon in large rotating machines. Unfortunately it is not completely understood and explained phenomenon yet. Especially creeping (also called gliding) discharge activity in winding heads is not deeply investigated and interpreted/explained. All of mentioned discharges may be marked as partial discharges (PD) in general. This study offers two points of view on this problem. At the first place it is a finite element modelling (FEM) of two different slot arrangements used for analysis of the electrostatic field. Second, the measurement on real model of stator winding helps confirming the validity of modelled results.

Keywords: partial discharge, measurement, modelling, finite element method

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