US 7,583,173 B2 · Nanocrystalline core for a current sensor, single and double-stage energy meters and current probes containing them

Abstract

A nanocrystallised tape-wound core without a localised airgap, consisting of a nanocrystalline material with the following atomic composition: [Fe1-aNia]100-x-y-z-a-β-γCuxSiyBzNbaM′βM″γ, wherein a≦0.3, 0.6≦x≦1.5, 10≦y≦17, 5≦z≦14, 2≦a≦6, β≦7, γ≦8, M′ is at least one of the elements V, Cr, Al and Zn, M″ is at least one of the elements C, Ge, P, Ga, Sb, In and Be, with a permeability μ of 200 to 4000, a saturation of more than 1T, an induction range, in which the permeability does not vary by more than 5%, of more than 0.9T, a remanent induction of less than 0.02T and a cut-off frequency higher than 1 MHz, such that μ varies by less than 1% when the core is aged for 100h at more than 100° C., μ varies by less than 5% when the core is coated, μ varies by less than 15% when the temperature is in the range of −25° C. and +60° C., and by less than 25% when the temperature is in the range of −40° C. and +120° C., and μ varies in a monotonic and substantially linear manner with a temperature of −40° C. to +120° C.

Claims15

Dependent claims

A wound nanocrystallised core without a localised air gap comprising a nanocrystalline material of atomic composition:

[Fe1-aNia]100x-y-z-α-β-γCuxSiyBzNbαM′βM″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 at least one of the elements V, Cr, Al and Zn, M″ being at least one of the elements C, Ge, P, Ga, Sb, In and Be having a permeability μ is greater than 1000 and less than or equal to 4000, a saturation of more than 1 T, an induction range in which the permeability does not vary by more than 5% higher than 0.9 T, a remanent induction of less than 0.02 T and a cut-off frequency above 1 MHz, and such that μ varies by less than 1% when the core is subjected to 100 hours ageing at more than 100° C., μ, varies by less than 5% when the core is coated, μ varies by 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., and in that μ varies regularly and almost linearly with temperature between −40° C. and +120° C.

An electrical measuring device of the energy metering type or current probe type comprising two magnetic cores, wherein at least one magnetic core is a wound nanocrystallised core without a localised air gap comprising a nanocrystalline material of atomic composition:

[Fe1-aNia]100x-y-z-α-β-γCuxSiyBzNbαM′βM″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 at least one of the 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 being less than 4.5%, having a permeability μ of between 200 and 1000, a saturation of more than 1 T, an induction range in which the permeability does not vary by more than 5% higher than 0.9 T, a remanent induction of less than 0.02 T and a cut-off frequency above 1 MHz, and such that μ varies by less than 1% when the core is subjected to 100 hours ageing at more than 100° C., μ, varies by less than 5% when the core is coated, μ varies by 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., and in that μ varies regularly and almost linearly with temperature between −40° C. and +120° C.

Dependencies are inferred from the claim text.

Nanocrystalline core for a current sensor, single and double-stage energy meters and current probes containing them

Life of this patent

Nanocrystalline core for a current sensor, single and double-stage energy meters and current probes containing them

Life of this patent

Abstract

Claims15