This paper presents an on-line current monitoring system for detecting rotor faults in large high voltage 3-phase induction motors. The philosophy and practical advantages of current monitoring are discussed and samples of on-site case histories will verify the effectiveness of the method for detecting broken rotor bars and air-gap eccentricity in the industrial environment. A new computerised diagnostic system with expert system capability will also be described.

Keywords:
rotor bar, diagnostic technique, prediction, end ring, eccentricity, sideband, installation, upstream oil & gas, vibration, duty cycle
Subjects:
Information Management and Systems
Copyright 1987, Society of Petroleum Engineers
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