Title :
A remote and sensorless stator winding thermal protection scheme for line-connected AC machines
Author :
Bin Lee, Sang ; Habetler, Thomas G.
Author_Institution :
Sch. of Electr. & Comput. Eng., Georgia Inst. of Technol., Atlanta, GA, USA
Abstract :
An advanced remote and sensorless thermal protection technique for line-connected AC machines is proposed in this paper. The proposed technique includes an algorithm for detecting abnormal cooling conditions due to reduced motor cooling ability in addition to a stator resistance (R/sub s/)-based stator temperature (T/sub s/) estimation scheme. The motor cooling ability monitoring algorithm can be implemented using the R/sub s/ estimates of an existing DC injection-based R/sub s/ estimation scheme without additional hardware or parameter information. In addition, the influence of the fuse, circuit breaker, and cable resistances on the R/sub s/ estimate is investigated, and methods for compensation are suggested for improving the accuracy of the R/sub s/ estimate, and therefore, the reliability of T/sub s/ monitoring. Experimental results under various abnormal cooling conditions verify that the reduced cooling ability of the motor can be reliably detected and that it can be used in addition to the T/sub s/ estimate for complete motor thermal protection.
Keywords :
AC machines; condition monitoring; machine protection; machine testing; machine theory; parameter estimation; stators; abnormal cooling conditions; line-connected AC machines; motor cooling ability; remote sensorless stator winding thermal protection scheme; stator resistance; AC machines; Circuit breakers; Condition monitoring; Cooling; DC motors; Fuses; Hardware; Protection; Stator windings; Temperature sensors;
Conference_Titel :
Industry Applications Conference, 2002. 37th IAS Annual Meeting. Conference Record of the
Conference_Location :
Pittsburgh, PA, USA
Print_ISBN :
0-7803-7420-7
DOI :
10.1109/IAS.2002.1043736