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Motor Thermal Protection by Continuous Monitoring of Winding Resistance

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1 Author(s)
Paice, Derek A. ; Research and Development Center, Westing-house Electric Corporation, Pittsburgh, PA 15235.

Simple practical techniques which sense ac line current afford protection of motor windings for many applications. A more complete protection system is described which continuously monitors average winding resistance and hence temperature by means of an easily applied dc injection technique. No additional motor connections are required.

Published in:

Industrial Electronics and Control Instrumentation, IEEE Transactions on  (Volume:IECI-27 ,  Issue: 3 )