Transformer system for measuring electrical current

Details Transformer system for measuring electrical current Transformer system for measuring electrical current

1987-08-19

1989-03-07

Kozma, Thomas J.

Inductor devices

With electric and/or magnetic shielding means

324127, 336175, 336223, 336225, H01F 1504, H01F 2728

Patent

active

048109894

ABSTRACT:
A transformer system for measuring electrical current includes an electrical conductor having first and second conductor portions. The first conductor portion conducts electrical current in one direction and the second conductor portion conducts the electrical current in an opposite direction. The first conductor portion produces a magnetic field H.sub.a and the second conductor portion produces a magnetic field H.sub.b. A coil having a non-ferromagnetic core is positioned between the first and second conductor portions so that the axis of the coil is substantially parallel to the magnetic fields H.sub.a and H.sub.b. The separation between the outer circumferential surface of the coil and the first and second conductor portions is the minimum distance for avoiding a voltage breakdown therebetween for a predetermined maximum electrical current in the conductor portions. At least one ferromagnetic shield surrounds the first and second conductor portions for shielding the coil from external magnetic fields.

REFERENCES:
patent: 4189618 (1980-02-01), Bretts et al.
patent: 4258347 (1981-03-01), Konig
patent: 4473810 (1984-09-01), Sougues et al.
patent: 4506214 (1985-03-01), Lienhard et al.
patent: 4513273 (1985-04-01), Friedl
patent: 4559495 (1985-12-01), Lienhard
patent: 4742296 (1988-05-01), Petr et al.

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