Title :
Tutorial: From the Steinmetz model to the protection of high inertia drives
Author :
Zocholl, Stanley E.
Author_Institution :
Schweitzer Engineering Laboratories, Inc., USA
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; rotors; stators; Steinmetz model; differential equation; high-inertia drive motor protection; induction motors; rotor; stator; thermal limit curves; thermal protection; Differential equations; Induction motors; Protection; Relays; Resistance heating; Rotors; Stators; Temperature; Tutorial; Voltage;
Conference_Titel :
Power Systems Conference: Advanced Metering, Protection, Control, Communication, and Distributed Resources, 2007. PSC 2007
Conference_Location :
Clemson, SC
Print_ISBN :
978-1-4244-0854-2
Electronic_ISBN :
978-1-4244-0855-9
DOI :
10.1109/PSAMP.2007.4740919
