Title :
Experience with turn insulation failures in large 13.2 kV synchronous motors
Author :
Walker, P. ; Champion, J.N.
fDate :
12/1/1991 12:00:00 AM
Abstract :
Experience of dealing with a very high rate of failures in a population of 21000 HP motors is recounted. Special testing done to identify the failure mechanism and the conclusions that were drawn are described. Various recommendations to prevent premature winding failures proved ineffective. It is shown how an engineering analysis indicated that the accepted view of the failure mechanism was untenable. A theory of partial discharge in the end turn of the stator winding that is compatible with all known facts is proposed
Keywords :
failure analysis; machine insulation; partial discharges; synchronous motors; 13.2 kV; 21000 hp; end turn; engineering analysis; failure mechanism; partial discharge; premature winding failures; stator winding; synchronous motors; testing; turn insulation failures; Coils; Failure analysis; Insulation; Production facilities; Stators; Stress; Surges; Synchronous motors; Testing; Voltage;
Journal_Title :
Energy Conversion, IEEE Transactions on
