Diagnosis method for the elements of the three-phase rectifier supplying a variable DC drive

For the operation of the static power converters, the experience of an expert is absolutely necessary for competitive functioning. Minor faults or defects of these equipments can lead to ravaging effects. In this paper is proposed a diagnosis method based on the analytic model which investigates the output waveforms of a three-phase rectifier supplying a variable DC drive for two types of possible faults of the switches: interrupted and short circuit. For identifying the defective components, the waveforms corresponding for different faults are stored in an information database in order to be compared with the ones corresponding to normal operation.