Detection and Localization of Supply Voltage Unbalance Using an Improved Park Lissajou’s Curves Approach

In this work a fault signature based on the Park Lissajou’s curve is suggested. It was applied to an induction machine driving a centrifugal fan, that operating in various industrial systems. We propose a new index extracted from Park Lissajou’s curve for the detection and localization of unbalanced voltages. In fact, the range ratio is determined to distinguish the two states; normal (balanced voltage) and faulty (unbalanced voltage). The ellipse orientation angle α is calculated to differentiate between the unbalance in phases B and C. This approach is simple, it shows its effectiveness and its robustness in detecting and localizing of studied fault.