Title :
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.
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;
Conference_Titel :
Electrical Insulation Conference and Electrical Manufacturing Expo, 2005. Proceedings
Conference_Location :
Indianapolis, IN
Print_ISBN :
0-7803-9145-4
DOI :
10.1109/EEIC.2005.1566262
