On the calibration of direct-current current transformers
Luca Callegaro, Cristina Cassiago, Enrico Gasparotto
TL;DR
This paper presents a calibration method for high-accuracy direct-current current transformers (DCCTs), demonstrating improved uncertainty levels and practical implementation for currents up to 2 kA.
Contribution
It introduces a calibration approach using commercial instruments, achieving uncertainties below 3E-7 for currents under 100 A, and details a case study for a 900 A DCCT.
Findings
Calibration uncertainty below 3E-7 for currents under 100 A
Effective implementation with commercial low resistance calibration instruments
Detailed example of calibrating a 900 A DCCT
Abstract
Modern commercial direct-current current transformers (DCCT) can measure currents up to the kA range with accuracies better than 1E-5. We discuss here a DCCT calibration method and its implementation with commercial instruments typically employed in low resistance calibration laboratories. The primary current ranges up to 2 kA; in the current range below \SI{100}{\ampere} the calibration uncertainty is better than 3E-7. An example of calibration of a high-performance DCCT specified for primary currents measurement up to 900 A is discussed in detail.
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