Title :
Aging of stator bars exposed to end arm discharges
Author :
Hudon, C. ; Bélec, M.
Author_Institution :
Inst. de Recherche, Hydro-Quebec, Varennes, Que., Canada
Abstract :
Three of the most common types of end arm discharges occurring during normal operation of air-cooled hydro-generators have been simulated in the laboratory. Sections of stator bars have been modified to induce either surface tracking, corona discharges at the semi-conductive paint/corona suppressor junction, or bar-to-bar discharges. Two setups of each type of defect were subjected to an aging voltage of 20 kilovolts, and discharge measurements were carried out as a function of time at both 20 kV and 8 kV. Phase resolved partial discharge and spectral analyses made it possible to recognize the activity of specific external defects
Keywords :
ageing; corona; hydroelectric generators; partial discharges; stators; 20 kV; 8 kV; aging; air-cooled hydrogenerator; bar-to-bar discharge; corona discharge; end arm discharge; external defect; phase resolved partial discharge; semiconductive paint/corona suppressor junction; spectral analysis; stator bar; surface tracking; Aging; Corona; Laboratories; Paints; Partial discharge measurement; Partial discharges; Stator bars; Surface discharges; Time measurement; Voltage;
Conference_Titel :
Electrical Insulation and Dielectric Phenomena, 1996., IEEE 1996 Annual Report of the Conference on
Conference_Location :
Millbrae, CA
Print_ISBN :
0-7803-3580-5
DOI :
10.1109/CEIDP.1996.564636
