| abstract |
Electrical measuring device of the energy meter or current probe type type comprising two magnetic toroids, characterized in that at least one magnetic core is a nanocrystallized wound toroid with no local air gap made of a nanocrystalline material of atomic composition: [Fe 1-a Ni a ] 100-xyz-α-β-γCu x Si y B z Nb α M ' β M " γ with a ≤ 0.3, 0.6 ≤ x ≤ 1.5, 10 ≤ y ≤ 17, 5 ≤ z ≤ 14, 2 ≤ α ≤ 6, β ≤ 7, γ ≤ 8, M 'being one at at least elements V, Cr, Al and Zn, M "being at least one of the elements C, Ge, P, Ga, Sb, In and Be, the nickel content of which is less than 4.5%, having a permeability μ between 200 and 1000, a saturation of more than 1T, an induction range where the permeability does not vary more than 5% greater than 0.9T, a remanent induction of less than 0.02T and a frequency with a cut-off greater than 1 MHz, and such that μ varies from less than 15% when the temperature varies between -25 ° C and + 60 ° C, and less than 25% when the temperature varies between -40 ° C and + 120 ° C. |