Short circuits faults diagnosis for the rectifier based on the analytic model method

The monitoring and diagnosis systems are needed to analyze the normal operation and maintenance of electrical systems. The approach is of interest because there are a lot of measuring points and a multitude of possible faults which can be analyzed. The method based on analytic models can be applied and the system behavior can be compared with normal operation of the system obtained as result of processing the mathematical model. The experience of an expert is absolutely necessary for the competitive operation of the static power converters. Ravaging effects can occur only if minor faults or failings appear in these equipment. The paper proposes a method of diagnosis which compares the waveforms in normal operation with the ones resulted from the analytic model when different types of power supply short circuits faults occur, applied to a variable DC drive supplied by a three-phase rectifier.