Title :
Losses in Roebel bars: effect of slot portion on circulating currents
Author_Institution :
Imperial College of Science & Technology, Department of Electrical Engineering, London, UK
fDate :
1/1/1970 12:00:00 AM
Abstract :
Stator windings in large alternators commonly use Roebel bars in which subconductors (strands) are transposed in the slot portion. Circulating currents may flow between the strands within a bar owing to the leakage fields in the end-winding regions. It is shown in the paper that such circulating current is not only limited by the strand resistances, but that the reactance of the slot portion to circulating current has a dominant effect. Measurements of reactance confirm the values obtained theoretically.
Keywords :
AC generators; current distribution; losses;
Journal_Title :
Electrical Engineers, Proceedings of the Institution of
DOI :
10.1049/piee.1970.0022
