EARLY DETECTION OF TURN-TO-TURN WINDING FAULTS USING A PWM RIPPLE CURRENT BASED METHOD

• DOI: 10.1049/icp.2021.0996
• Publication Date: 2021-06-29T20:06:36Z
• Authors: D. A. Hewitt; R. Hu; J. Wang
• Keywords: Turn (biochemistry); Fault indicator; Harmonic

The ability to detect turn-to-turn short-circuit faults (turn-faults) is an important aspect of ensuring reliable machine operation. Turn-faults create a low impedance path within the winding, resulting in large fault currents, creating winding hotspots and increased rate insulation degradation. This causes propagate increasing severity, until reaching point catastrophic failure. Early detection turn-fault allows mitigation strategies be put place, reducing amount damage caused machine. As develops from failure, residual series resistance reduces; this work considers impact range values on for PWM harmonic based algorithm operate correctly, determining how far must fall (or conversely, fault-current rise) order detectable by algorithm. It concluded that capable successfully operating with around two orders magnitude (100mΩ) larger than short circuit without any additional (1.4mΩ).