Application of expert systems in diagnostics of high voltage insulating systems

Abstract

Expert systems are used for evaluating the actual state and future behavior of insulating systems of high voltage electrical machines and equipment. Several rule-based expert systems were developed in the High Voltage Laboratory of the Czech Technical University in Prague for these purposes in the cooperation with top diagnostic workplaces in the Czech Republic. The IZOLEX expert system evaluates diagnostic measurement data from commonly used off-line diagnostic methods for the diagnostics of high voltage insulating systems of rotating machines, non-rotating machines and insulating oils. The CVEX expert system evaluates the discharge activity on high voltage electrical machines and equipment by means of an off-line measurement. The CVEXON expert system is for evaluating the discharge activity by on-line measurement and the ALTONEX expert system is the expert system for on-line monitoring of rotating machines. In these days, the complex system for the evaluation of partial discharge measurement has been developed. Two parallel expert systems work in this complex evaluating system: a rule-based expert system performs an amplitude analysis of partial discharge impulses for determining the damage of the insulating system, and a neuron network is used for the phase analysis of partial discharge impulses to determine the kind of partial discharge activity.