METHOD AND DEVICE FOR MEASURING ELECTRIC CURRENT USING CURRENT CONVERTER Russian patent published in 2017 - IPC G01R15/18 

FIELD: metrology.

SUBSTANCE: invention relates to metrology, particularly to current measurement method. Method provides compensation of secondary coil ohmic resistance by means of two-terminal device with negative ohmic resistance. At that implements function of DC component secondary current maintenance induced primary current in secondary coil. Then in converter core sequence of pulses is introduced, core is magnetized to saturation flow and magnetic flow is reduced again by applying second voltage pulse with reverse polarity. “Voltage-to-time” area of second pulse is selected so that operating point was reached in converter, in which with magnetization flow, low relative to saturation current, converter differential inductance is large as possible. Device contains secondary circuit consisting of coil and two-terminal device with negative ohmic resistance, current measurement device, controlled voltage source, a switch, an adder, efficient value generator, correlator, rectangular compensation signal generator, multiplier, window function generator, resistance compensation controller, ramp signal correlator.

EFFECT: technical result is increased accuracy of measurements.

18 cl, 15 dwg