High-current CT calibration using a sampling current ratio bridge

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DOIResolve DOI: http://doi.org/10.1109/TIM.2013.2253975
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TypeArticle
Journal titleIEEE Transactions on Instrumentation and Measurement
ISSN0018-9456
Volume62
Issue6
Article number6506958
Pages16931698; # of pages: 6
SubjectAlternating current; Current ratios; Digital sampling; Phase displacement; Phase error; Ratio error; Electric current measurement; Electric instrument transformers
AbstractA measurement setup is developed for the accurate ratio measurement of ac current transformers (CTs) for primary currents up to 5 kA. A unique property of the system is the use of high-quality digitizers for sampling of the secondary current signals and step-down transformers with different current ratios. This allows for accurate comparison of CTs even when their nominal ratios are not equal. The calibration results of the key components in the setup show that the sampling current ratio bridge has a ratio uncertainty of better than 2 μ A/A in magnitude and 0.8 μrad in phase for CT-under-test current ratios that do not differ by more than a factor of 5 from one of the ratios in the reference CT. The linearity of the bridge for input currents changing between 1% and 120% of nominal input current is better than 4 μ A/A in magnitude and 0.5 μ rad in phase.
Publication date
LanguageEnglish
AffiliationMeasurement Science and Standards; National Research Council Canada
Peer reviewedYes
NPARC number21270444
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Record identifier8d79cfd1-f093-482a-9533-7e6929d252be
Record created2014-02-11
Record modified2016-05-09
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