Title :
Ontario Hydro experience with generator rotor forging cracks at the winding slot tooth roots
Author_Institution :
Ontario Hydro, Toronto, Ont., Canada
Abstract :
This paper describes the experience of Ontario Hydro with rotor forging cracks in the winding slot tooth roots of several of its 500 MW generators. A summary is provided regarding; how the cracks were discovered, crack similarities between rotors, crack initiation and propagation theories, crack growth rate estimates, limiting factors, NDE techniques developed to find and size existing cracks, vibration monitoring for crack propagation, and the final results of the crack investigations
Keywords :
crack detection; electric generators; forging; machine testing; nondestructive testing; rotors; vibration measurement; 500 MW; NDE techniques; Ontario Hydro; crack growth rate estimates; crack initiation; crack propagation theories; crack similarities; cracks discovery; cracks sizing; generator rotor forging cracks; limiting factors; nondestructive evaluation; rotors; vibration monitoring; winding slot tooth roots; Electric breakdown; Heating; Insulation; Machine windings; Monitoring; Nose; Rotors; Stator cores; Stress; Teeth;
Conference_Titel :
Electric Machines and Drives, 1999. International Conference IEMD '99
Conference_Location :
Seattle, WA
Print_ISBN :
0-7803-5293-9
DOI :
10.1109/IEMDC.1999.769097
