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An improved two-stage current transformer

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2 Author(s)
West, J.L. ; Rotek Instrum. Corp., Waltham, MA, USA ; Miljanic, Petar N.

A novel design of magnetic cores and windings of a two-stage current transformer which considerably improves its linearity and accuracy for a given load is discussed. The equations which describe the operation of the transformer are given, and formulas for the calculation of the error are derived. A practical technique for unloading the second core and bringing its magnetic flux near zero is given. Experimental results show that with relatively small cores and a small amount of copper an accuracy better then 20 ppm and 20 μrd is achieved. The device is passive, with no electronically enhanced technique being implemented

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Instrumentation and Measurement, IEEE Transactions on  (Volume:40 ,  Issue: 3 )