Measuring transformer

Details Measuring transformer Measuring transformer

1981-09-17

1985-03-19

Karlsen, Ernest F.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Magnetic saturation

324127, 324249, G01R 120, G01R 3300

Patent

active

045062145

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: 3812428 (1974-05-01), Trenkler
Schernus et al; "A New Digital Method . . . "; IEEE Trans. on Instrumentation and Measurement; vol. IM-21; No. 4; Nov. 1972; pp. 346-349.

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