Title :
Optimizing Motor Thermal Models
Author :
Zocholl, Stanley E.
Abstract :
The thermal limitations of induction motors are specified by thermal limit curves that are plots of the limiting temperature of the rotor and stator in units of l2t. This paper discusses the thermal protection provided by rotor and stator thermal models defined by the thermal limit curves and supporting motor data. The thermal model is the time-discrete form of the differential equation for temperature rise due to current and is derived from fundamental principles as shown in the Appendix. The rotor model derives the slip-dependent l2r watts using voltage and current that permit the safe starting of high-inertia drive motors. The performance of the models is shown in constant and cyclic load tests.
Keywords :
differential equations; induction motor protection; rotors; stators; cyclic load test; differential equations; high-inertia drive motors; induction motors; limiting temperature; motor thermal models; temperature rise; thermal limit curves; thermal protection; Conductors; Differential equations; Induction motors; Protection; Protective relaying; Resistance heating; Rotors; Stators; Temperature; Thermal engineering; Motor Protection; Thermal Models; Thermal Protection;
Conference_Titel :
Industrial & Commercial Power Systems Technical Conference, 2007. ICPS 2007. IEEE/IAS
Conference_Location :
Edmonton, Alta.
Print_ISBN :
1-4244-1291-9
Electronic_ISBN :
1-4244-1291-9
DOI :
10.1109/ICPS.2007.4292097
