Title :
Case study - high ozone concentration in hydro generators
Author :
Millet, C. ; Nguyen, D.N. ; Lépine, L. ; Bélec, M. ; Lessard-Déziel, D. ; Guddemi, C.
Author_Institution :
Hydro-Quebec Production, Montreal, QC, Canada
fDate :
May 31 2009-June 3 2009
Abstract :
Ozone emission in hydro generators is a sign of surface partial discharge (PD) in the stator windings. Surface PD activity can take different forms: slot PD, corona at the junction of the slot semiconductive coating with the voltage grading coating outside the slot, PD between adjacent coils in the end-winding, PD between adjacent connections and surface tracking. An ozone concentration above the daily exposure limit, for which there is a health hazard for workers, was found at several locations in a 6-hydro generator plant. The ozone level in the vicinity of the generators was in the same range for all of them. This case study presents how this problem was identified and addressed.
Keywords :
hydroelectric generators; hydroelectric power stations; machine insulation; partial discharge measurement; surface discharges; daily exposure limit; high ozone concentration; hydro generator plant; ozone emission; slot semiconductive coating; stator windings; surface PD activity; surface partial discharge; surface tracking; voltage grading coating; worker health hazard; Coatings; Couplers; Hazards; Instruments; Partial discharge measurement; Partial discharges; Power generation; Power measurement; Stator windings; Surface discharges;
Conference_Titel :
Electrical Insulation Conference, 2009. EIC 2009. IEEE
Conference_Location :
Montreal, QC
Print_ISBN :
978-1-4244-3915-7
Electronic_ISBN :
978-1-4244-3917-1
DOI :
10.1109/EIC.2009.5166340
