DEVICE TO DEFINE AMPLITUDE-FREQUENCY AND PHASE-FREQUENCY CHARACTERISTICS OF CURRENT SHUNTS Russian patent published in 2014 - IPC G01R27/02 

FIELD: electricity.

SUBSTANCE: device comprises a pulse current source where a half-wave rectifier is connected to the first output of the secondary winding of a step-up network transformer (SNT), and an energy storage unit connected to the second output of the SNT secondary winding is connected to the said rectifier via a resistor charging rate limiter The first electrode of a switch is connected to the resistor charging rate limiter The SNT primary winding is connected to an industrial AC voltage source A shunt being tested is connected to the second electrode of the switch and the second output of the SNT secondary winding via contact terminals A standard current transformer (SCT) is set between the tested shunt and the contact terminals A signal registration and processing unit comprises the first ADC to which the first Fourier fast conversion unit (FFCU) is connected The second ADC is connected to the second FFCU A calculating unit, the first FFCU, a functional conversion unit and a display are coupled via a common data bus The first ADC is connected to the output of the tested shunt, and the second ADC is connected to the SCT output In the signal registration and processing unit the first multiplying unit is connected to the first FFCU, and the second multiplying unit connected to the first functional conversion unit is connected to the second FFCU The third FFCU is connected to the third multiplying unit in the first unit for the determination of idealised coefficients of reverse transmission of the analogue-to-digital converters The fourth FFCU is connected to the second functional conversion unit which is connected to the third multiplying unit connected to the first multiplying unit The fifth FFCU is connected to the fourth multiplying unit in the second unit for the determination of idealised coefficients of reverse transmission of the analogue-to-digital converters The sixth FFCU is connected to the third functional conversion unit which is connected to the fourth multiplying unit connected to the second multiplying unit The first unit of functional signal conversion, the first multiplying unit, the second, third, fourth, fifth and sixth FFCUs are coupled via a common data bus.

EFFECT: reduced influence of the ADC quantisation error at determining AFC and PFC of current shunts.

2 dwg