23 Aug
2018
23 Aug
'18
2:02 a.m.
tor 2018-07-26 klockan 12:15 -0700 skrev Chuck Guzis via cctalk:
On 07/26/2018 11:51 AM, Ed Sharpe wrote:
The electric arc furnace works much better at 25 Hz.
The hydro power station in Trollh?ttan was first built as a 25 Hz
because :
desiredness of electric power for the metallurgical industry in
Trollh?tan.
Trouble: the other intended customer Gothenburg city wanted 50 Hz.
The last 25 Hz generator in Trollh?ttan was taken off the electric grid
in 1959.
smecc has stashed a huge mother gen set 115 60cy in 115
400 cy out. was used to run rca avq 10 raradr....
we have....
but could run many many things... it is huge,,, these things
exist out there if you need one,...
400Hz power was also used in aviation gear. I remember having a
stock
of small surplus 400Hz transformers salvaged from various bits of
equipment purchased on Chicago's "Surplus Row".
Transformers are much smaller than their 50/60 Hz cousins.
On the other hand, when I worked in a steel mill, much of the power
distribution was 25Hz. Transformers were much larger. At some
point,
one of the mills converted their lighting from incandescent to
mercury-vapor running from that 25Hz supply. I'm surprised that
nobody
experienced seizures from the flicker.