2011/5/9 Olin Lathrop > No, it wasn't missed since it wasn't relevant to the discussion. The > output > voltage is a function of the excitation field strength, but has no bearin= g > on the speed of a unloaded generator. > > Yes it does. Increasing RPM will raise the terminal voltage of the unloaded generator. We used to do this (although I agree it is not recommended) with very old Westinghouse 230MW hydrogenators that were electro-mechanically controlled and sometimes the excitation system (dynamic systems) was unable to raise the voltage to the desired 18KV so we just pumped up a little the speed through the governor system and get a few hundred more voltages, to the expense of raising a couple more RPMs. These are very antique gens, which need a lot of "tweaking" to get them going. Regards, Carlos. --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .