Re: Ferrite chokes & saturation

To: "'Tesla List'" <tesla-at-poodle.pupman-dot-com>
Subject: Re: Ferrite chokes & saturation
From: Tesla List <tesla-at-stic-dot-net>
Date: Fri, 21 Nov 1997 22:35:18 -0600
Approved: tesla-at-stic-dot-net

From: 	Edward V. Phillips[SMTP:ed-at-alumni.caltech.edu]
Sent: 	Friday, November 21, 1997 1:07 PM
To: 	tesla-at-pupman-dot-com
Subject: 	Re: Ferrite chokes & saturation

""Does anyone actually know how to determine, either through specs or
measurement, if a ferrite core choke is likely to saturate in a Tesla xfmr
protection network?  Is it the 60 Hz current or the HF current that is
significant, or both?  How would either of these be calculated?"

        Sure!  Suggest you go to the Amidon home page, to which this
address will lead you:

	http://www.bytemark-dot-com/amidon/fermprp2.htm

and read the data on ferrites and magnetic cores.  Somewhere in that
you will find the formulae for calculating flux density in a core.
It varies directly as the voltage across the coil wound on it, 
inversely as the frequency and the number of turns.  They alwso
also give you data on the maximum density for various grades of
ferrite, and also give mechanical specs for cores.  Should have
added that the core area also determines the flux density; larger
area = lower flux density, as total flux depends only on the three
quantities mentioned first.

Ed