Analysis and improvements of precision coaxial current shunts for direct measurement of ac current

Lapuh, R.; Pinter, Borut; Voljc, Bostjan; Svetik, Z.; Lindič, M.

doi:10.1109/imtc.2011.5944186

Cited by 2 publications

(1 citation statement)

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“…The frequency dependence of the shunt resistance is almost negligible for such coaxial current shunts. For the frequency range from DC up to 62.5 Hz it can be assumed that it is <0.3 μA A −1 , as shown by the experimental results given in [7], but also from other analysis even for higher currents and/or higher frequencies [14][15][16][17][18]. Therefore, the same shunt can be used for AC measurements, using the value R Sh obtained in (1) as its resistance value (figure 5).…”

Section: Ac Measurement Set-upmentioning

confidence: 98%

Calibration of a precision current measurement system for high AC voltages using an AC quantum voltmeter

et al. 2022

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This paper describes the calibration of a high precision AC current measurement device which is required in a system to measure AC voltages up to 800 kV in the frequency range of 10 Hz to 400 Hz. The AC current measurement unit of such a system requires the calibration of the input current in the milliampere range at a frequency of approximately 50 Hz, and all measurements have been made at a suitable frequency of 62.5 Hz. An AC Quantum Voltmeter is used to achieve a traceability chain from DC resistance calibration, when it works as DC quantum standard, and as AC quantum standard for the AC current measurement. All DC and AC measurements needed for one calibration point (one current level) can be done in a rapid sequence within 30 minutes using the same AC Quantum Voltmeter, such that the combined uncertainty is at a level of 1 µA A-1 (k = 1).

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