Understanding service factor, thermal models, and overloads

  • S. E. Zocholl
  • Published 2006 in
    59th Annual Conference for Protective Relay…


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. 


6 Figures and Tables

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