Extending the Operating Life of Critical High Voltage Motors

Abstract

This paper presents an online partial discharge (PD) trending and data interpretation, related to several similar motors in critical non-spared services. Online partial discharge patterns and trending’s were studied to demonstrate if aging conditions were relevant to the motor stator winding. Acquired Phase Resolved Partial Discharge (PRPD) plots were co-related with in-depth stator winding visual inspection which was a collaborative resolution between the Owner, the OEM, and Electrical Motor Services team. A detailed refurbishment and validation test plan was established to reduce surface electrical discharge activity and to extend the in-service life of the motor. A systematic approach with regards to field reconditioning solutions and the life cycle cost reduction was followed and will be explained.