Current ratio device for use in forming a current transformer

Details Current ratio device for use in forming a current transformer Current ratio device for use in forming a current transformer

1997-03-27

1999-04-20

Berhane, Adolf

Electricity: power supply or regulation systems

Including a transformer or an inductor

With compensation

336176, H01F 4006

Patent

active

058960279

ABSTRACT:
A current ratio device for use in forming a hand-held openable-core clamp-on type of current transformer. The device employs electronically-aided three-stage circuitry for forming a current transformer capable of accurate low current measurements over a wide range of operation. Such a current transformer is specifically adapted for use with highly accurate active/reactive power and energy meters, and harmonic power analysers. For example a preferred form of clamp-on transformer can be used to measure currents in the range from 1 A to 200 A with ratio errors of less than 50.times.10.sup.-6 for both the in-phase and quadrature components.

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patent: 5307008 (1994-04-01), So
Miljanic, P. et al., "An Electronically Enhanced Magnetic Core for Current Transformers", published in IEEE Trans. Instrum. Meas., No. 40, No. 2, pp. 410-414, Apr. 1991.
So, E. et al., "High-Current High-Precision Openable-Core AC and AC/DC Current Transformers", IEEE Trans. Instrum. Meas., vol. 42, No. 2, pp. 571-576, Apr. 1993.
Ramboz, J.D., "A Highly Accurate Hand-Held Clamp-On Current Transformer", IEEE Trans. Instrum. Meas., vol. 45, No. 2, pp. 445-448, Apr. 1996.
Brooks, H.B. and Holtz, F.C., "The Two-Stage Current Transformer", AEEE Trans. 41.382 (1922).
Moore, W.J.M. and Miljanic, P.N., "The Current Comparator", Inst. Elec. Eng. Electrical Measurement Series, vol. 4, London, UK: Peter Peregrinus, 1988. (Book).

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