[Amps] Benefits of 3-phase power?

[Skram, Helge (MED)]

The mains frequency choice must also have something to do with wavelength.
The wavelength for 1000Hz is 300km. 
An open quarter wavelength line at 75km, would be a short at the supplier
side.

The wavelength for 50Hz is 6000km, so it is much easier to avoid
transmission line effects.

Maybe tolerable losses at 50 versus 400 or 1000Hz was a problem when
frequency was decided.

Helge LA6MV 

-----Original Message-----
From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com]On
Behalf Of wb8jkr at juno.com
Sent: 21. november 2003 11:18
To: wrt at dslextreme.com; amps at contesting.com
Subject: Re: [Amps] Benefits of 3-phase power?


  My understanding is that 60 Hz was the best "compromise"
between the amount tolerable losses and the amount of required
iron.

Mark  WB8JKR


On Thu, 20 Nov 2003 07:29:46 -0800 Bill Turner <wrt at dslextreme.com>
writes:
> On Tue, 18 Nov 2003 23:50:33 -0500, <kayser at sympatico.ca> wrote:
> 
> >There is in some ways a genius in the 110/220 decision so many 
> years ago.  
> 
> _________________________________________________________
> 
> Too bad they went with a relatively low frequency.  400 Hz is widely
> used in aircraft and has numerous advantages.  In fact, if they 
> would
> go to ~1000 Hz, electrocution would become a thing of the past.  The
> human nervous system can not sense an electric shock when the
> frequency is higher than 600-700 Hz or so.  One could still get a
> nasty burn, but think how many lives would be saved.
> 
> OT, to be sure.
> 
> --
> Bill, W6WRT
> 
> _______________________________________________
> Amps mailing list
> Amps at contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
> 


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