Experimental study of the effect of positive sequence voltage on the derating of induction motors under voltage unbalance

Author

Quispe, E.C. ; López-Fernández, X.M. ; Mendes, A.M.S. ; Cardoso, A. J Marques ; Palacios, J.A.

fYear

2011

fDate

15-18 May 2011

Firstpage

908

Lastpage

912

Abstract

This paper presents the results of an experimental study on derating of an induction motor under different voltage unbalanced conditions and its comparison with the NEMA standard MG1 voltage unbalance derating graph. During the derating tests the 4 kW squirrel cage induction motor temperature rise was kept constant at the rated value and the windings temperature was measured on-line by means of an accurate digital thermal monitoring system with nine thermocouples positioned in both stator and rotor circuits. The obtained results show that the positive sequence voltage plays an important role in the derating performance of the induction motor under unbalanced conditions, and that the unbalance voltage indices currently used do not allow for accurately measuring this influence.

Keywords

induction motors; thermocouples; digital thermal monitoring system; induction motors; positive sequence voltage; squirrel cage induction motor temperature rise; thermocouples; voltage unbalance; windings temperature; Heating; IEC standards; Induction motors; Monitoring; Rotors; Temperature measurement; Voltage measurement; Derating; NEMA MG1; heating test; induction motor; positive sequence voltage; thermal monitoring system; voltage unbalance;

fLanguage

English

Publisher

ieee

Conference_Titel

Electric Machines & Drives Conference (IEMDC), 2011 IEEE International

Conference_Location

Niagara Falls, ON

Print_ISBN

978-1-4577-0060-6

Type

conf

DOI

10.1109/IEMDC.2011.5994936

Filename

5994936