Failure identification and analysis for high-voltage induction motors in the petrochemical industry

This paper gives a synopsis of condition monitoring methods, both as a diagnostic tool and as a technique for failure identification in high-voltage induction motors in industry. New operating experience data for 483 motor units consisting of 6135 unit years are registered and processed statistically to ascertain the connection between motor data, protection and condition monitoring methods, maintenance philosophy and different types of failures. The different types of failures are further analyzed to determine the failure initiators, contributors and underlying causes. The results have been compared with those of a previous survey, the "IEEE Report of Large Motor Reliability Survey of Industrial and Commercial Installations, 1985." In the present survey, the motors range from 100 to 1300 kW; 47% of them are between 100-500 kW.