Abstract
An accurate measurement of direct currents in closed superconducting circuits is often difficult to perform, especially if the circuit is exposed to time dependent and/or high stationary magnetic fields. In this paper a new type of non-contacting direct current meter that can measure large currents (in this case up to 25 kA) with an accuracy of 0.1% of full scale is presented. The device consists of a superconducting toroidal transformer that encloses the unknown current flowing through the aperture, a shielded field sensing coil which is connected to the transformer but positioned in a weak magnetic field, and a control unit that presents a reading of the measured current.
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