[Legacy Report] Signature based monitoring of electrical motor condition
Summary
Induction motors are widely used electrical drives in the industries. Failure of motors can cause significant production delays which leads to financial losses. Hence it is imperative to minimize motor breakdowns in process plants. Squirrel cage induction motors experience their own peculiar set of problems which are result of electromagnetically generated fields, despite the critical motors provided with protections like, over current, stalling, under voltage, etc., as a part of type-2 level power system co-ordination. However it is experienced that some internal damages like broken rotor bars, power quality related problems, could not be detected with these protections.
It is essential to address the above problems with advanced diagnostic techniques. Motor Current Signature Analysis (MCSA) is a specialized technique to diagnose problems, such as broken rotor bars, current unbalance, wave form anomalies, Total Harmonic Distortion (THD) etc.,. Through MCSA technique at Visakhapatnam Steel Plant, internal problems in high capacity motors have been detected at an early stage in very vital units of Mill Fan Motors of 630 KW in Coke Ovens , Primary Air Fan Motors of 450 KW in Power plant, Main Drive Ventilation fan motors of 132 KW in Mills area, thereby avoiding major damages and catastrophic failures.
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Krishna Mohan of DGM(E), Technical Services Rastriya Ispat Nigam Limited (RINL)
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Address:VISAKHAPATANAM, Andhra Pradesh, India