tor 2018-07-26 klockan 12:15 -0700 skrev Chuck Guzis via cctalk: > On 07/26/2018 11:51 AM, Ed Sharpe wrote: > > > > 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. >
The electric arc furnace works much better at 25 Hz. The hydro power station in Trollhättan was first built as a 25 Hz because : desiredness of electric power for the metallurgical industry in Trollhätan. Trouble: the other intended customer Gothenburg city wanted 50 Hz. The last 25 Hz generator in Trollhättan was taken off the electric grid in 1959.
