Understanding service factor, thermal models, and overloads
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Induction motors require thermal protection to prevent overheating to cyclic as well as steady state overloads. This paper discusses the problem that occurred while a customer was testing the motor relay that trip prematurely when subjected to cyclic loads that do not overheat the motor and the characteristic curves are analyzed.
[1] M.C. McDonald,et al. Increasing refiner production by using motor thermal capacity for protection and control , 1996, Conference Record of 1996 Annual Pulp and Paper Industry Technical Conference.