Failure detection in converter fed induction machines under different operation conditions

This paper focuses on the experimental investigation of methods for the detection of stator faults in cage rotor induction machines fed by voltage source inverters (VSI). Three experimental investigations: unbalance in one stator phase, turn-to-turn fault in one phase and one stator phase open, have been performed to study the behavior of the electrical machine under these fault conditions. The work aims to provide further documentation for an advanced condition monitoring and detection system, by monitoring electrical quantities, in order to avoid undesirable operating conditions and to detect and diagnose electrical faults. A description of the measurement system including the data acquisition and processing is presented. Stator current signature, analysis of the space phasor of the stator current and of the instantaneous power as diagnostic techniques are considered