Abstract
The double fault in squirrel cage induction motors, which means that rotor bar breaking fault and stator winding inter-turn short circuit fault are present simultaneously, has been investigated based on the motor multi-loop model. The results indicate that the features of rotor bar breaking fault and stator winding inter-turn short circuit fault always interlace and interact to some extent. The detection method, which is only suitable for single fault, may lead to a misinterpretation. In this paper, the double fault feature of rotor bar breaking and stator winding inter-turn short circuit has been summarized and the mutual relationship of the two types of fault has been disclosed by thoroughly analyzing the simulation and experiment results. As establishes a solid theoretical foundation for joint detection of rotor bar breaking and stator winding inter-turn short circuit double fault.
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