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, 324127, 324244, G01R 1900, G01R 3300, H04M 322
Patent
active
042789389
ABSTRACT:
A line current measuring arrangement employs a single toroidal core with line windings, control windings, and a sense winding. The line windings cause an amount and polarity of magnetizing intensity H in the core when a line current flows. The control windings are pulsed by control current pulses to cause successively equal changes of opposite polarity of control H in the core to drive the core to successively opposite polarities of B saturation. The sense winding is arranged so that successive changes of B cause successive sense voltage pulses of opposite polarity. Successive sense voltage pulses are of different amplitude only if a line current is flowing to cause an amount of line H in the core. Successive voltage pulses are 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 the core in opposition to any line H. The output voltage becomes constant when the feedback H cancels the line H, whereupon the constant output voltage is a measure of any line current.
REFERENCES:
patent: 2108642 (1938-02-01), Boardman
patent: 3699442 (1972-10-01), Riley
patent: 3855528 (1974-12-01), Brown
Bell Telephone Laboratories Incorporated
Karlsen Ernest F.
Turner Sherman N.
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