阻抗电桥法测量交流分流器时间常数

doi:10.3969/j.issn.1000-1158.2025.01.12

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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.

Key words： electromagnetic metrology AC shunt time constant impedance bridge method

Received: 22 May 2024 Published: 14 January 2025

PACS:

TB97

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	Articles by authors
	FENG Jian
	SHI Leibing
	ZHOU Bihong
	HU Junjie
	XU Feng

Cite this article:

FENG Jian,SHI Leibing,ZHOU Bihong, et al. Time Constant Measurement of AC Shunt by Impedance Bridge[J]. Acta Metrologica Sinica, 2025, 46(1): 75-79.

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http://jlxb.china-csm.org:81/Jwk_jlxb/EN/10.3969/j.issn.1000-1158.2025.01.12 OR http://jlxb.china-csm.org:81/Jwk_jlxb/EN/Y2025/V46/I1/75

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