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The use of soft-starters has proliferated in industrial induction motors to damp the negative effects of high-starting currents, among other reasons. Despite the fact that soft-starters reduce the probability of rotor damage, some industrial cases of rotor failures in soft-started motors have been reported. Over recent years, a novel diagnosis trend based on the analysis of the motor startup current...
Advanced analysis of the motor starting currents enables very reliable diagnostics of the rotor condition, providing immunity against the eventual false alarms obtained with the conventional MCSA. However, the application of this methodology has been mainly restricted to the case of line-started machines. Its extension to the cases of soft-started or inverted-fed motors has been barely investigated,...
The present paper presents an study on the harmonics introduced by thyristor-based soft-starters in the induction motor starting current. It is observed how the use of these starting elements leads to the amplification of the amplitudes of some specific harmonics. The application of continuous time-frequency decomposition tools enables to visualize the full transient evolutions of these harmonics...
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