On 06/15/2016 10:12 AM, Lennart Sorensen wrote:
On Tue, Jun 14, 2016 at 10:15:43PM -0400, James Knott via talk wrote:
A few years ago, I read a book about power systems in Ontario. There were a few different frequencies, other than 25 & 60 Hz. There were even rotary converters (combination motor & alternator in one unit) to change the frequency. I seem to recall there was still one to convert to 25 Hz for industrial users in the Buffalo area. Apparently there was 25Hz produced at Niagara for industrial users until 2009. The cost to change all that equipment was considered too high and not worth it.
IIRC, it was produced at the plant upstream from the falls, which is now a museum. Also, 25 Hz power was still running the Fort Erie area, until 1966. https://en.wikipedia.org/wiki/Ontario_Hydro