GEOFF KLEMPNER, BASc, is a consulting engineer in the power industry. He has served on numerous IEEE committees and standards working groups for large generators and is also a contributor to CIGRE on large rotating electrical machines. ISIDOR KERSZENBAUM, PhD, is an IEEE Fellow, located in Irvine, California. He is a generator specialist consulting to power plants on operation, maintenance and troubleshooting of large motors and generators.