Re: Mains Current Monitoring

I'll track down some data for ferrites (Fair-Rite, Amidon, and Micrometals
would be likely suppliers, by the way), but for silicon steel: 12000 A/m -at-
1.8T, or 4500 A/m -at- 1.5T depending on the kind and form of steel, which
affects the losses: first number for 3.6 W/kg -at- 1 T, the second is for 1.3
W/kg-at-1T (both at 50Hz)

Amidon doesn't have their info on their web site, but they'll fax it to you
if you call them.

> From: Tesla List <tesla-at-pupman-dot-com>
> To: tesla-at-pupman-dot-com
> Subject: Re: Mains Current Monitoring
> Date: Tuesday, March 23, 1999 10:34 PM
> Original Poster: "Malcolm Watts" <MALCOLM-at-directorate.wnp.ac.nz> 
> Hi Jim,
> <snip>
> > Ferrite saturates at a very low flux which is ok in RF designs where
> > frequency is high, and the flux isn't too high, but not so good at
> > line frequencies. Tape wound silicon steel would be preferred, possibly
> > a powdered metal.
> Do you have any comparative figures for silicon steel and ferrite 
> with the same cross-sectional area (mean length doesn't count unless 
> the difference is *huge*) ?   I have reasons for wanting to know 
> this. Perhaps I should build a curve tracer.
> Thanks in advance,
> Malcolm