Measuring transformer

Details Measuring transformer Measuring transformer

1982-08-06

1984-06-26

Karlsen, Ernest F.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Magnetic saturation

324127, 324249, 336212, G01R 120, G01R 3300, H01F 100

Patent

active

RE0316130

ABSTRACT:
A measuring transformer comprises a measuring conductor carrying the current I.sub.m to be measured, a pre-magnetizing winding which carries a pre-magnetizing current I.sub.v, and a magnetic field comparing means which is exposed to the magnetic field produced by the current I.sub.m and the magnetic field produced by the pre-magnetizing current I.sub.v and is alternately controlled in both directions of saturation. The magnetic field comparing means is a magnetic film which may be anisotropic, operated in the magnetic preferential direction, and have a thickness of at most a few microns. It may be secured to pole shoes of a magnetic core or arranged between a flat measuring conductor and a pre-magnetizing coil of flat cross-section. The measuring transformer can be used as an input transformer in a static electricity meter. In a further embodiment, the output pulses can be obtained directly from the magnetic field comparing means.

REFERENCES:
patent: 2906945 (1959-09-01), Weiss
patent: 2946955 (1960-07-01), Kuhrt
patent: 3212006 (1965-10-01), McQuarrie
patent: 3372334 (1968-03-01), Fenoglio et al.
patent: 3454879 (1969-07-01), Smitka
patent: 3573616 (1971-04-01), Kahen
patent: 3691497 (1972-09-01), Bailey et al.
patent: 3748618 (1973-07-01), Kaiserswerth et al.
patent: 3812428 (1974-05-01), Trenkler
Irons et al., "Magnetic Thin-Film . . . ", IEEE Trans. on Magnetics, vol. Mag-8, No. 1, Mar. 1972, pp. 61-65.
Schernus et al., "A New Digital Method", IEEE Trans. on Inst. & Meas., vol. Im-21, No. 4, Nov. 1972, pp. 346-348.

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