Corona free winding in electrical machines

Author

Asokan, T.

Author_Institution

GE India Technol. Center, Bangalore, India

fYear

2004

fDate

19-22 Sept. 2004

Firstpage

222

Lastpage

225

Abstract

Corona or partial discharge is one of the parameters that dictate the reliability of the rotating machines. The corona formation is directly associated with the fill factor and hence winding cross section. In the present work, a systematic study is been made to reveal the location of corona formation in different winding cross sections (tetragonal and triangular packing). Acute angle formation at the wire interface is found to be the cause for corona inception. Compaction of winding is found to eliminate the corona location through hexagonal packing. An electrostatic FEM analysis revealed that the electric stress in hexagonal packing is very low compared to the conventional cross-sections, indicating that the former is a corona free winding configuration.

Keywords

corona; finite element analysis; machine testing; machine windings; partial discharges; reliability; acute angle formation; corona inception; electric stress; electrostatic FEM analysis; fill factor; hexagonal packing; partial discharge; rotating machine reliability; tetragonal packing; triangular packing; winding cross section; wire interface; Cable insulation; Conductors; Corona; Electrostatics; Frequency locked loops; Machine windings; Partial discharges; Rotating machines; Stress; Wire;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Insulation, 2004. Conference Record of the 2004 IEEE International Symposium on

ISSN

1089-084X

Print_ISBN

0-7803-8447-4

Type

conf

DOI

10.1109/ELINSL.2004.1380529

Filename

1380529