Ground fault interrupters for glassy metal alloys

Details Ground fault interrupters for glassy metal alloys Ground fault interrupters for glassy metal alloys

1990-01-19

1990-09-11

Deboer, Todd E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361 42, 361 44, 340650, H02H 316

Patent

active

049567438

ABSTRACT:
A ground fault interrupter is adapted to be connected to a circuit having a supply current and a return current. The interrupter has a detection mechanism, including one or more than one cores, for detecting one or more than one ground fault currents. The core is composed of a metal alloy which is at least about 90 percent glassy and which consists essentially of a composition having the formula Co.sub.a Fe.sub.b Ni.sub.c M.sub.d B.sub.e Si.sub.f where M is at least one selected from a group consisting of Cr, Mo, Mn and Nb, the quantity a, b, c, d, e and f are in atom percent and the sum (a+b+c+d+e+f) is equal to 100 where "a" ranges from about 66 to 71, "b" ranges from about 2.5 to 4.5, "c" ranges from about 0 to 3, "d" ranges from about 0 to 2 except when M=Mn in which case "d" ranges from about 0 to 4, "e" ranges from about 6 to 24 and "f" ranges from about 0 to 19, with the proviso that the sum of "a", "b" and "c" ranges from about 72 to 76 and the sum of "e" and "f" ranges from about 25 to 27, said alloy having the form of a ribbon and having been heat-treated to induce Perminvar-like characteristics thereof. An interruption mechanism operates in response to a signal or more than one signals from the detecting mechanism to interrupt the supply current or currents.

REFERENCES:
patent: 3158785 (1964-11-01), Gagniere et al.
patent: 3856513 (1974-12-01), Chen et al.
patent: 4152144 (1979-05-01), Hasegawa et al.
patent: 4249969 (1981-02-01), De Cristofaro et al.
patent: 4366520 (1982-12-01), Finke et al.
G. B. Finke et al., IEEE Trans. Mag., MAG-17, p. 3157 (1981).
F. Pfeifer et al., IEEE Trans. Mag., MAG-18, p. 1406 (1982).

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