Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Magnetic saturation
Patent
1979-07-27
1981-07-14
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Magnetic saturation
179 18FA, 361 45, G01R 3300, H04M 322
Patent
active
042789397
ABSTRACT:
A line current measuring arrangement employs two separate toroidal cores with line windings and control windings. The line windings cause equal amounts of the same polarity of magnetizing intensity H in the cores when a line current flows. The control windings are pulsed by control signals to cause equal changes of opposite polarity of control H in the two cores to drive the two cores to opposite polarities of saturation of magnetic induction B. The same control windings also provide a succession of voltage pulses where the amplitudes and polarities of the pulses are measures of differences in the changes of B in the two cores. A succession of voltage pulses is cumulatively and algebraically integrated to provide a changing output voltage which is a measure of the cumulative integration. The output voltage is effective through the agency of the same control windings to cause feedback H in both cores in opposition to any line H. The output voltage becomes constant when the feedback H cancels the line H in the cores, whereupon the constant output voltage is a measure of any line current.
REFERENCES:
patent: 3699442 (1972-10-01), Riley
patent: 4118597 (1978-10-01), Proctor et al.
Bell Telephone Laboratories Incorporated
Karlsen Ernest F.
Turner Sherman N.
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