The use of transient current for the evaluation of the condition of rotor and stator insulation systems of large synchronous rotating machines

Author

Paynot, C. ; Lamarre, L. ; David, É ; Taghizad, R.

Author_Institution

EXACT-DMI, Sainte-Foy, Que.

fYear

2005

fDate

26-26 Oct. 2005

Firstpage

78

Lastpage

81

Abstract

Results related to the measurement of transient currents recorded after a DC voltage step followed by a short-circuit are reported for both rotor and stator windings for a number of hydro and turbo synchronous rotating machines, motors and generators, in order to assess the quality of the insulating system. Measurements were conducted in the field for windings from different technology yielding different time domain response. Besides reckoning the aging of the insulation, other features such as moisture absorption, end-winding contamination and incomplete curing of the insulating resin (followed by post-curing) were detected in several cases

Keywords

ageing; electric current measurement; machine insulation; machine windings; synchronous machines; time-domain analysis; transients; turbomachinery; aging; condition evaluation; end-winding contamination; generator; hydro-turbo synchronous rotating machine; insulating resin; moisture absorption; motor; quality assessment; rotor; stator winding; time domain reponse; transient current measurement; Current measurement; DC motors; Insulation; Pollution measurement; Rotating machines; Rotation measurement; Rotors; Stator windings; Synchronous motors; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Insulation Conference and Electrical Manufacturing Expo, 2005. Proceedings

Conference_Location

Indianapolis, IN

Print_ISBN

0-7803-9145-4

Type

conf

DOI

10.1109/EEIC.2005.1566262

Filename

1566262