Title :
Online detection of endwinding contamination in industrial motors
Author :
Neti, P. ; Pinjia Zhang ; Xiaoguang Qi ; Yingneng Zhou ; Younsi, Karim ; Shah, M.R. ; Weeber, K.
Author_Institution :
Electr. Machines Lab., Gen. Electr. Global Res. Center, Niskayuna, NY, USA
Abstract :
This paper discusses a novel online technique to detect moisture and surface tracking of stator end-winding insulation in medium/high voltage AC motors. A novel high sensitivity differential current transformer is used as a sensor for monitoring insulation capacitance and dissipation factor of motors online. A 100 hp, 4160V, 3-phase form-wound induction motor is tested with different contaminants sprayed on its end winding. Partial discharge couplers are also used to monitor partial discharge activity during insulation contamination tests. A comparison of both techniques to detect pre-cursors of motor failure due to end-winding tracking is presented in this paper.
Keywords :
capacitance measurement; induction motors; insulation testing; insulator contamination; machine insulation; moisture measurement; partial discharge measurement; stators; AC motor; dissipation factor; endwinding contamination; form wound induction motor; industrial motor; insulation capacitance monitoring; insulation contamination test; moisture detection; motor failure; online detection; partial discharge coupler; partial discharge monitoring; power 100 hp; stator end winding insulation; surface tracking; voltage 4160 V; Current measurement; Insulation; Leakage current; Partial discharges; Pollution measurement; Stator windings; Temperature measurement; condition monitoring; contamination; endwinding; insulation tracking; partial discharge;
Conference_Titel :
Electrical Insulation Conference (EIC), 2011
Conference_Location :
Annapolis, MD
Print_ISBN :
978-1-4577-0278-5
Electronic_ISBN :
pending
DOI :
10.1109/EIC.2011.5996159
