A Calibration Service for Current Transformers by John D. Ramboz and Oskars Petersons 2026-11-05
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Title page: John D. Ramboz and Oskars Petersons, NIST, June 1991. Section 1.2, printed pp.4–5, Figure 2 and equation 2: equivalent circuit. Section 1.3, printed pp.5–6: marked/true ratios, ratio correction factor and lead-positive phase angle.
Additional apparatus locator: section 2.1, Calibration Circuits, printed pages 12–15, Figures 8–9, describes current-transformer calibration with a compensated current comparator in secondary-feed and primary-feed arrangements. nvlpubs.nist.gov/nistpubs/Legacy/SP/nistspecialpublication250-36.pdf
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