Title :
Early intervention
Author :
Wiedenbrug, E. ; Frey, G. ; Wilson, J.
Abstract :
This paper presents very expensive impulse testing (also called surge testing) and turn insulation deterioration in electric motors. The tests include multiple start and stops under normal line conditions. The stresses introduced into the winding during startup and stopping process were two-fold. These stresses were the cause of the shorted turn-turn. The insulation failure mechanisms, fundamentals of impulse testing and results of various tests are presented.
Keywords :
electric motors; impulse testing; insulation testing; machine insulation; machine testing; EAR; electric motors; error-to-area ratio; impulse testing; insulation failure mechanisms; surge testing; turn insulation deterioration; Aging; Dielectrics and electrical insulation; Electric motors; Failure analysis; Impulse testing; Insulation testing; Partial discharges; Polarization; Stators; Voltage;
Journal_Title :
Industry Applications Magazine, IEEE
DOI :
10.1109/MIA.2004.1330768
