Title :
Improved detection method for winding surge tests of large AC motors
Author :
Schump, David E.
Author_Institution :
Baker Instrum. Co., Fort Collins, CO, USA
Abstract :
The error area ratio method of digitally comparing surge test ringing patterns has been developed to aid in the detection of short circuits in motor windings. The sensitivity of this new detection method is sufficient to detect one turn shorted in many hundreds. The method can be used to detect shorts among parallels in large motor windings which could not be detected with earlier measurement techniques. Detection of a single shorted turn in a winding of 5000 turns has been achieved. In addition, detection of shorts among parallel windings has been demonstrated. The authors describe the improved test circuit and numerical analysis techniques utilized to compare surge test waveforms. Printouts to waveforms and descriptions of faults in large motors are also presented
Keywords :
AC motors; fault location; machine testing; machine windings; surges; detection method; error area ratio method; faults; large AC motors; motor windings; numerical analysis techniques; parallel windings; ringing patterns; short circuits; test circuit; winding surge tests; AC motors; Circuit faults; Circuit testing; Fault detection; Insulation testing; Oscilloscopes; Performance evaluation; Stress; Surges; Voltage;
Conference_Titel :
Electrical Electronics Insulation Conference, 1989. Chicago '89 EEIC/ICWA Exposition., Proceedings of the 19th
Conference_Location :
Chicago, IL
DOI :
10.1109/EEIC.1989.208244
