FIELD: measurement equipment.;SUBSTANCE: invention relates to metrology, namely to current sensors. A Rogowski coil unit for measurement of high-frequency electrical currents includes turn sections connected in series so that a connection with reduced influence of backward impedance is formed. Besides, at least two turn sections are connected to each other in series through a signal isolation circuit, with that, the output of one turn section is connected to the input of the signal isolation circuit, and the input of the next turn section is connected to the output of the signal isolation circuit. The signal isolation circuit includes an electrical component for conversion of impedance with high input impedance and low output impedance. The electrical component for conversion of impedance represents an operating amplifier made as a voltage repeater, or an operating amplifier and two resistors, which are in-series connected, as a voltage divider; besides, the operating amplifier and the voltage divider are made in the form of a non-inverting amplifier, and the output of the turn section is connected to the non-inverting input of the operating amplifier, and the input of the turn section is connected to the input of the voltage divider.;EFFECT: increasing measurement sensitivity.;16 cl, 12 dwg
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