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 ofthe 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-lime 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.