The effect of interfering flux on direct current comparator

Shao, Haiming; Qu, Kaifeng; Pan, Yang; Lin, Feipeng; Liang, Bo

doi:10.1109/cpem.2010.5544835

Cited by 2 publications

(2 citation statements)

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“…8(b), which is usually adopted for evaluating the leakage flux influence, the leakage flux for the connection shown in Fig. 8(a) is much closer to the 'normal' operating state [10]. This means the effect of leakage flux is less than 0.022 × 10 −6 of the series ratio of T 3 , and less than 0.005 × 10 −6 of the series ratio of T 2 , and has no noticeable effect on T 1 and T 0 .…”

Section: Leakage Flux Effectmentioning

confidence: 98%

See 1 more Smart Citation

DC 5 kA Current Ratio Standards Based on Series–Parallel Self-Calibration DCCs

Shao¹,

Lin²,

Liang³

et al. 2013

IEEE Trans. Instrum. Meas.

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With proper design, accurate current ratios of direct current comparators (DCCs) can be achieved between series and parallel connections of n sections of primary windings with the same nominal number of turns. Based on this principle, a DCC could be calibrated with the windings connected in series, then operated in parallel, at rated current and therefore have its current ratio accurately extended by n times. By keeping the geometric position of the primary windings symmetrically and rigidly fixed to the cores, the leakage fluxes and their effects on the DCC current ratios would be minimized and relatively unchanged between the series and parallel connections. Four DCCs with current ratios of 10 A:1 A to 5 kA:5 A have been developed with relative ratio errors less than 2 × 10 −8 to 5 × 10 −7 , and calibrated by the series parallel method through only four step measurements. These measurement techniques for the selfcalibration of DCCs with current ratios of 10 A:1 A to 5 kA:5 A and corresponding uncertainties from 1.2 × 10 −8 to 1.6 × 10 −7 (k = 2) are described.

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Section: Leakage Flux Effectmentioning

confidence: 98%

“…T 3 -a 1000-turns as the secondary and ten 1-turn as the primary. To minimize the magnitude of leakage flux from the primary windings [10], for T 0 , T 1 , and T 2 , each section of the primary windings, W pi (i = 1-10), is wound uniformly and loosely, and distributed symmetrically around the cores as shown in Fig. 3(a).…”

Section: A Construction Of Dccsmentioning

confidence: 99%