Title :
Improvements in corona probe testing of modern hydroelectric generators
Author :
Timperley, James E.
Author_Institution :
American Electr. Power Service Corp., Columbus, OH, USA
Abstract :
The authors reevaluate the required test voltage, necessary stabilization time, and traditional measurement frequencies for corona probe testing. Studies indicate that the corona inception voltage (CIV) can be estimated for each stator slot. When a coil is operated below its CIV, deterioration due to electrical discharges is very unlikely. This was verified through dissection of several coils. Data were compiled from tests performed on four machines with epoxy-mica insulation systems at service ages of 10000, 50000, and 200000 h
Keywords :
corona; hydroelectric generators; machine insulation; organic insulating materials; probes; stators; 1E4 h; 2E5 h; 5E4 h; corona probe testing; electrical discharges; epoxy-mica insulation systems; hydroelectric generators; inception voltage; measurement frequencies; stabilization time; stator slot; test voltage; Coils; Corona; Frequency measurement; Insulation testing; Performance evaluation; Probes; Stators; System testing; Time measurement; Voltage;
Conference_Titel :
Electrical Electronics Insulation Conference, 1989. Chicago '89 EEIC/ICWA Exposition., Proceedings of the 19th
Conference_Location :
Chicago, IL
DOI :
10.1109/EEIC.1989.208246
