Clever, clever, delta, New Orleans.........................

And who said there's no wit here!

Yeah, 25 Hz has kind of pooped out recently. It is still generated on the
Canadian side of Niagara Falls, but it is all converted to 60.

Across the river in Buffalo, the utility still provides 25 Hz to about 50
customers, but they have announced its termination as of 2007. There are a
few isolated paper mills that make their own, I believe that Con Edison
makes a little, and there is one isolated pocket in Iowa, but that's all I
know of that's left.

I remember when 60, 50 and 25 cycle motors were all stocked items!

Thanks in advance.

"John Larkin" wrote in
message ...
On Sat, 3 Jan 2004 14:10:54 -0500, "BFoelsch"
wrote:


"John Larkin" wrote in
message ...
Wow. If it was delta, then 110 3-phase would require 6 wires (or five
if you cheat and share one corner) so the 110 3-phase motor would need
three isolated windings and most likely a 6-pole on/off switch. Was it
really like that?

Nope. Draw a picture of a Delta, center-tap each winding, and the three
center taps form another delta at half the voltage. Used a perfectly
standard (for 1922) 3 phase, 3 wire, 110v, 25Hz motor.


Oh, yeah, OK. New Orleans is mostly below sea level, and the
Mississippi runs along most of it and peaks way above in the spring.
Up to fairly recently, New Orleans was drained by ancient pumps with
ancient switchgear, running on 25 Hz, and all the generators that made
the 25 Hz were (of course) in the city, below sea level too.

John