Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Magnetic saturation
Patent
1979-07-27
1981-06-16
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
042740517
ABSTRACT:
A line current measuring arrangement employs two matched toroidal cores with line windings, control windings, sense windings, and feedback windings. The line windings cause equal amounts of the same polarity of magnetizing intensity H in the two cores when a line current flows. The control windings are pulsed by control current pulses to cause equal changes of opposite polarity of control H in the two cores to drive the two cores to saturation of magnetic induction B. The sense windings are serially opposed so that the changes of B in the two cores cause sense voltages in polarity opposition. Any difference in the sense voltages, due to the presence of line current H, is cumulatively and algebraically integrated to provide a changing output voltage which is a measure of the cumulative integration. The output voltage causes 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 both cores, whereupon the constant output voltage is a measure of any line current.
REFERENCES:
patent: 2164383 (1939-07-01), Burton
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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