Short Winding Fault Detection Using Park’s Vector

The subject of on-line detection of short winding fault in three-phase induction motors is discussed, and a noninvasive approach, based on the computer-aided monitoring of the stator current Park’s Vector, is introduced. The park's vector representation is obtained using Virtual instrument. The Virtual Instrument is obtained by programming in Labview software. The laboratory tests were conducted on 0.5 hp three phase induction motor. The motor was initially tested under healthy condition and Park's vector representation was plotted. After this, the short winding fault is replicated in the motor. The motor was tested again under faulty condition and Park's vector representation was plotted. Both plots were then compared. It is observed that current park's vector pattern of healthy motor was perfect circle while current park's vector pattern under faulty condition was elliptical in shape. Experimental results, obtained by using a special fault producing test rig, demonstrate the effectiveness of the proposed technique, for detecting the presence of short winding fault in operating three-phase induction machines. Keyword: Short winding fault, Fast Fourier Transform (FFT), Induction motor, LabVIEW.