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A New Sensor for the Electrical Equipment Leakage Current

To achieve the accurate and non-contact detection of the electrical equipment leakage current at the millampere level, this paper presents a new single-turn cored clamp-type sensor named the Microcrystalline-alloy Rogowski coil. The creative construction technique of the new sensor remedies the disadvantage of the Rogowski coil with the structure of microcrystalline alloy core. The experimental test of the prototype was carried out to show the superior performance and the excellent practical value in the application of the faint current measurement.