1results about How to "No false positives" patented technology

The application discloses a method for early detection of turn-to-turn short circuit of a stator winding of an induction motor based on a voltage signal, and comprises the following steps: collecting three-phase stator winding voltage signals of an induction motor to be detected during operation; performing time-frequency analysis to obtain time-frequency energy; constructing a cost function, and initializing a time-frequency ridge line of the voltage signal; updating the time-frequency ridge line to realize accurate estimation of the time-frequency ridge line of the voltage signal; calculating three-phase voltage symmetrical components, performing time-varying band-pass filtering, and obtaining fundamental waves of the three-phase symmetrical components; calculating amplitudes of the three-phase symmetrical component fundamental waves, constructing an extended zero-sequence voltage factor, and realizing real-time detection of a turn-to-turn short circuit fault; and constructing a fault phase index to realize identification of a turn-to-turn short circuit phase. The application can effectively detect an early turn-to-turn short circuit fault, improves the accuracy of online detection, reduces the hardware cost of online detection, improves the robustness of online detection under non-stationary conditions, reduces the complexity of data acquisition and signal processing, and improves the practicability of intelligent health management.