Detector circuit for current measurements

Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Magnetic saturation

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324127, G01R 1900

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active

046161740

ABSTRACT:
The measurement of large DC and AC currents, are measured by a zero-flux current transformer. Two identically wound toroidal cores in which the magnetic flux induced by a primary current is neutralized by a counter-flux induced by a compensation current is passed through a compensation winding (14) common to both cores and having many turns. The compensation current is adjusted by means of an amplifier so that the mean flux in the cores is zero. The intensity of the compensation current is measured by the voltage drop across a measuring resistor. Any unbalances between the primary and secondary ampere-turns are sensed by a detecting circuit comprising of a sensing winding wound on each core and divided into two subwindings which carries a magnetizing current from a current source in such a way that the odd-harmonic components contained in the magnetizing current are outbalanced, while the even-harmonic components contained therein are added and conducted to a rectifier to provide a control signal to the amplifier for the adjusting of the compensation current. A greatly improved signal-to-noise ratio for the signal is obtained.

REFERENCES:
patent: 4274051 (1981-06-01), Condon
patent: 4278939 (1981-07-01), Henry
Jacques Lisser et al., Nullfluss-Stromwandler zur Messung von Gleich- und Wechselstromen, ETZ, vol. 100 (1979) Issue No. 24, pp. 1390-1394.
M. Groenenboom et al., The Zero-Flux Current Transformer--A High Precision Wide-Band Measuring Device, Bull. Sci. Assoc. Ing. Electr. Inst. Electrotech. Montegiore (Belgium), vol. 90, No. 2, pp. 22-25, Apr.-Jun. 1977.
H. C. Appelo et al. The Zero-Flux DC Current Transformer--A High Precision Bipolar Wide-Band Measuring Device, IEEE Transactions on Nuclear Science, vol. NS-24, No. 3, Jun. 1977. pp. 1810-1811.

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