Tutorial: From the Steinmetz model to the protection of high inertia drives

Author

Zocholl, Stanley E.

Author_Institution

Schweitzer Engineering Laboratories, Inc., USA

fYear

2007

fDate

13-16 March 2007

Firstpage

284

Lastpage

291

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;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/PSAMP.2007.4740919

Filename

4740919