Many papers in the scientific literature show that a thorough accuracy testing of Current Transformers (CTs) employed for harmonic measurements in ac power systems should be based on the injection of multitone waveforms that are similar to those found during regular operation. CTs typically measure three-phase currents and according to the sensing principle they may suffer from both nonlinearity and crosstalk due to the other phases. For this reason, a full metrological characterization should be based on a truly three-phase testing. However, this demands for a three-phase current generator that allows applying the required waveforms, which in most cases it is not available because of its cost and complexity. In this scenario, the target of the present paper is proposing an architecture for implementing a low-cost three-phase, three- wire current generator that is suitable for the purpose, using instrumentation that is typically available in calibration laboratories. After having discussed the operating principle and the implementation, its performance in generating realistic multitone periodic current waveforms has been assessed.

Development of a Low-Cost Three-Phase Current Generator for Testing Current Transformers

Faifer M.;Laurano C.;Ottoboni R.;Toscani S.
2023-01-01

Abstract

Many papers in the scientific literature show that a thorough accuracy testing of Current Transformers (CTs) employed for harmonic measurements in ac power systems should be based on the injection of multitone waveforms that are similar to those found during regular operation. CTs typically measure three-phase currents and according to the sensing principle they may suffer from both nonlinearity and crosstalk due to the other phases. For this reason, a full metrological characterization should be based on a truly three-phase testing. However, this demands for a three-phase current generator that allows applying the required waveforms, which in most cases it is not available because of its cost and complexity. In this scenario, the target of the present paper is proposing an architecture for implementing a low-cost three-phase, three- wire current generator that is suitable for the purpose, using instrumentation that is typically available in calibration laboratories. After having discussed the operating principle and the implementation, its performance in generating realistic multitone periodic current waveforms has been assessed.
2023
2023 13th IEEE International Workshop on Applied Measurements for Power Systems, AMPS 2023 - Proceedings
979-8-3503-1240-9
ELETTRICI
Calibration
current measurement
current transformer (CT)
harmonic distortion
instrument transformer (IT)
measurement uncertainty
power quality
power system harmonics
power system measurements
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11311/1257285
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