Current monitoring for detecting inter-turn short circuits in induction motors

Author

Stavrou, Andreas ; Sedding, Howard G. ; Penman, James

Author_Institution

Electr. Authority of Cyprus, Larnaka, Cyprus

Volume

16

Issue

1

fYear

2001

fDate

3/1/2001 12:00:00 AM

Firstpage

32

Lastpage

37

Abstract

In this paper the stator winding itself is used as the sensor for the detection of abnormalities in the stator winding. To achieve this task, detailed analysis of the air gap flux distribution and its dependence on the particular machine configuration is carried out. The analysis presented is based on the rotating wave approach which accounts for all the stator and rotor MMF harmonics, stator and rotor slot harmonics and harmonics due to saturation. It is shown that the most reliable indicators of the presence of the fault are the lower sideband of field rotational frequency with respect to the fundamental, together with some of the components that are related to slotting. Some of them increase as functions of the link current, in a range from 0 to over 10% and some components decrease in the range 0-12%

Keywords

air gaps; electric current measurement; harmonic analysis; induction motors; magnetic flux; monitoring; rotors; short-circuit currents; stators; air gap flux distribution; current monitoring; field rotational frequency; induction motors; inter-turn short circuits detection; machine configuration; rotating wave approach; rotor MMF harmonics; stator slot harmonics; stator winding; Circuit faults; Frequency; Harmonic analysis; Impedance; Induction motors; Insulation; Magnetic flux density; Magnetic separation; Monitoring; Stator windings;

fLanguage

English

Journal_Title

Energy Conversion, IEEE Transactions on

Publisher

ieee

ISSN

0885-8969

Type

jour

DOI

10.1109/60.911400

Filename

911400