Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Magnetic saturation
Patent
1982-06-10
1984-11-13
Levy, Stewart J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Magnetic saturation
324127, 330 8, 336212, G01R 3300
Patent
active
044828624
ABSTRACT:
A current measuring system includes three toroidal magnetic cores. The first core has a non-linear B-H characteristic and being adapted for operation in and between its saturation ranges of its B-H characteristic. The second and third cores are adapted for operation in their substantially non-saturating range of their B-H characteristics. The first core is coupled in a flux oscillator configuration to provide a first error signal representative of low frequency flux changes in the core. The first core and the second core each have noise cancellation windings which are shorted in a manner cancelling noise. A high frequency sensor winding on the third core provides a second error signal representative of intermediate and high frequency flux changes in that core. A feedback network combines the first and second error signals to generate a bucking current which is coupled by way of bucking windings on all three cores. The system is adapted to null flux in the three cores due to flux induced by an input current-to-be-measured on a conductor passing through the three cores.
REFERENCES:
patent: 2428613 (1943-10-01), Boyajian
patent: 3454879 (1966-03-01), Smitra
patent: 3768011 (1973-10-01), Swain
patent: 4276510 (1981-06-01), Tompkins et al.
patent: 4286211 (1981-08-01), Nakamura
patent: 4286214 (1981-08-01), Milkovic
patent: 4298838 (1981-11-01), Akamatsu et al.
patent: 4314200 (1982-02-01), Marek
Groenenboom, M. and Lisser, J., The Zero-Flux Current Transformer, A Wide Band Measuring Device for AC and DC, (IEE Conference on Developments in Power Systems Protection, London, 1980).
Levy Stewart J.
The Charles Stark Draper Laboratory Inc.
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