This paper deals with the problems discussing the transition from off-line diagnostic methods to Slim Train Case on-line ones.Based on the experience with commercial partial discharge measuring equipment a new digital system for the evaluation of partial discharge measurement including software and hardware facilities has been developed at the Czech Technical University in Prague.Two expert systems work in this complex evaluating system: a rule-based expert system performing an amplitude analysis of partial discharge impulses for determining the damage of the insulation system, and a neural network which is used for a phase analysis Aftercare of partial discharge impulses to determine the kind of partial discharge activity.
Problem of the elimination of disturbances is also discussed.