Abstract：The equivalent model of four-terminal AC shunt is introduced. An AC impedance bridge using the zero flux current transformer（ZCT） as the current proportional standard is constructed to measure the main parameter of the AC shunt. A multi-decade two-stage inductive voltage divider is used to divide the voltage of the standard ac resistor. The differential measurement circuit measures the voltage difference between the shunt under test and the standard AC resisor. The bridge signals are sampled by the dual-channel synchronous sampling system and the voltage amplitude ratio and phase difference are calculated by the discrete Fourier transform algorithm. Then the resistance and time constant of the AC shunt can be computed. Verification experiments show that the measuring device can achieve precise measurement of AC shunts below 100 A in the frequency range of 20 Hz~3 kHz. The optimum expanded uncertainty of time constant is 8 ns.
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2025, Vol. 46 
