Electromagnetic arrangement for measuring electric

专利名称：Electromagnetic arrangement for measuring

electrical current

发明人：James L. Henry申请号：US06/061463申请日：19790727公开号：US042739A公开日：19810714

摘要：A line current measuring arrangement employs two separate toroidal coreswith line windings and control windings. The line windings cause equal amounts of thesame polarity of magnetizing intensity H in the cores when a line current flows. Thecontrol windings are pulsed by control signals to cause equal changes of oppositepolarity of control H in the two cores to drive the two cores to opposite polarities ofsaturation of magnetic induction B. The same control windings also provide a successionof voltage pulses where the amplitudes and polarities of the pulses are measures ofdifferences 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 ameasure of the cumulative integration. The output voltage is effective through theagency of the same control windings to cause feedback H in both cores in opposition toany line H. The output voltage becomes constant when the feedback H cancels the line Hin the cores, whereupon the constant output voltage is a measure of any line current.

申请人：BELL TELEPHONE LABORATORIES, INCORPORATED

代理人：Sherman N. Turner

更多信息请下载全文后查看