Title :
Tutorial: From the Steinmetz Model to the Protection of High-Inertia Drives
Author :
Zocholl, Stanley E.
Author_Institution :
Schweitzer Engineering Laboratories, Inc.
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 I2t. 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 Annex. In the rotor model, voltage and current are used to derive the slip-dependent I2r watts that permit the safe starting of high-inertia drive motors
Keywords :
differential equations; induction motor drives; induction motor protection; thermal analysis; Steinmetz model; differential equation; high-inertia drive thermal protection; induction motors; safe starting; time-discrete form; Differential equations; Induction motors; Protection; Rotors; Stators; Synchronous motors; Temperature; Thermal resistance; Tutorial; Voltage;
Conference_Titel :
Protective Relay Engineers, 2007. 60th Annual Conference for
Conference_Location :
College Station, TX
Print_ISBN :
1-4244-0994-2
Electronic_ISBN :
1-4244-0995-0
DOI :
10.1109/CPRE.2007.359899
