Wide band transformer based on a split-conductor current sensor and a Rogowski coil for high current measurement

The objectofthepresentpaper isthepresentation ofthe first experiences made by the Authors in the realiwion of an accuracte, high current and wide band current tmnsducer charac- terized by low cost and small size. The workingprinciple of the device is based on the combination of a Rogowski coil and a D.C. electronic transducer connected to a split condccctor current sensor in order to increase the range of the measurable current. The complete project of the device, whose block diagram is reported in the presentpaper, will allow to estimate currents up to kA in a range of frequecies from D.C. to 1 MHz with a overall accuracy less than 0.5%. In the paper a description of the different measurement principles is reported together with fist experimental results relah've to the Rogowski coil section. The data obtained exibii an encouraging coherence to the proposed target.