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Seeking square law torroid core

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Flyback

Well-Known Member
Hi,
We are seeking a "square law" ferrite torroid to use as a fluxgate sensor for imbalance current detection. For 50Hz mains electricity.
No manufacturer seems to make these.
I tried Far-rite, Mag-inc, Ferroxcube and TDK, but no joy. Plenty of high permeability (eg 5000), but no "square law".
We need OD= >35mm, ID = >15mm
Please Do you know of any?
 
Hi Flyback,

Many years ago I did some work for PNI studying the earth's magnetic fields. They used a square flux core. I don't find then in my junk core pile. I will look more.
I also have some "mag amps" from coilcraft. No longer being make. I do have some power cores built to sharply saturate. magnetic amplifier: coilcraft has removed all information they had.

Not much help.
 
Thanks, is "nanocrystalline" possibly a "square law" core (some versions of it)? I believe ferrite cant be square law?
 
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