Calibration of Current Transformers in distorted conditions

Crotti, G.; Femine, Antonio Delle; Gallo, Daniele; Giordano, D.; Landi, C.; Letizia, Palma Sara; Luiso, Mario

doi:10.1088/1742-6596/1065/5/052033

Cited by 25 publications

(17 citation statements)

References 8 publications

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“…Therefore, the digitizer maintains its accuracy over a wide frequency range and, after implementation, the FFT algorithm can also be used for defining errors of the CT during transformation of the distorted currents. The values of current and phase errors of the harmonics transformation by the tested CTs can also be determined with the two-channel data acquisition board presented in [23,24]. All presented methods require a reference device.…”

Section: Introductionmentioning

confidence: 99%

Wideband Self-Calibration Method of Inductive CTs and Verification of Determined Values of Current and Phase Errors at Harmonics for Transformation of Distorted Current

Stano

Kaczmarek

2020

Sensors

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Self-calibration of a designed wideband inductive current transformer (CT) was carried out in the ampere-turns condition. This method does not require a reference transducer. The values of current and phase errors at the harmonics of frequencies from 100 Hz to 5 kHz were determined for the distorted primary current of the rated main frequency equal to 50 Hz. These results were verified based on the comparison of values measured between two CTs and calculated as the difference between values obtained from their calibration. Moreover, from vectorial diagrams drawn for transformation of the higher harmonics, the source of the change in the values of current and phase errors with frequency is explained. Furthermore, the method for calculation of the values of the corresponding harmonics of the current associated with the active power losses in the core and the magnetization current is presented.

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Section: Introductionmentioning

confidence: 99%

Wideband Self-Calibration Method of Inductive CTs and Verification of Determined Values of Current and Phase Errors at Harmonics for Transformation of Distorted Current

Stano

Kaczmarek

2020

Sensors

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“…As for the calibration, several studies are found in literature for ITs and the research is evolving and continuing every day [8][9][10][11][12][13]. In particular, among the studies, three different ways of tackling ITs' accuracy are distinguished (but not limited to them): (i) the use of compensating techniques to solve the ITs' nonlinearities; (ii) assessment of the ITs' behavior when working at off-nominal conditions; and (iii) studies based on preliminary characterization at rated conditions.…”

Section: Introductionmentioning

confidence: 99%

Calibration Procedure to Test the Effects of Multiple Influence Quantities on Low-Power Voltage Transformers

Mingotti

Peretto

Tinarelli

2020

Sensors

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The article presents a study on low-power voltage transformers (LPVTs). Considering their increasing spread among Smart Grids, it is fundamental to assess their accuracy behavior in as realistic conditions as possible. Therefore, this article presents a detailed calibration procedure to test LPVTs’ accuracy when various external influence quantities are simultaneously acting on them. In the calibration procedure, the considered quantities are frequency, air temperature, and external electric field. Afterwards, the designed procedure is applied on three different off-the-shelf LPVTs using a measurement setup developed in a laboratory environment. The presented results (i) confirm the easy applicability of the designed calibration procedure; (ii) highlight the various effects of the influence quantities on the accuracy of different types of LPVTs; (iii) confirm the need to include more realistic tests, like the type-tests presented, into the standards to appreciate a wider set of possible in-field behaviors.

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“…It is worthwhile to emphasize that in all the cited papers, even if the performance is experimentally evaluated, merely rough experiments using signals of a few volt are executed, excluding input transducers. However, it is known that input transducers are typically the major source of uncertainty in measurement chains for power systems [28][29][30][31][32][33][34][35][36][37]; this issue, specifically for PMU application, is also demonstrated in [38].…”

Section: Introductionmentioning

confidence: 99%

The Design of a Low Cost Phasor Measurement Unit

et al. 2019

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The widespread diffusion of Phasor Measurement Units (PMUs) is a becoming a need for the development of the “smartness” of power systems. However, PMU with accuracy compliant to the standard Institute of Electrical and Electronics Engineers (IEEE) C37.118.1-2011 and its amendment IEEE Std C37.118.1a-2014 have typically costs that constitute a brake for their diffusion. Therefore, in this paper, the design of a low-cost implementation of a PMU is presented. The low cost approach is followed in the design of all the building blocks of the PMU. A key feature of the presented approach is that the data acquisition, data processing and data communication are integrated in a single low cost microcontroller. The synchronization is obtained using a simple external Global Positioning System receiver, which does not provide a disciplined clock. The synchronization of sampling frequency, and thus of the measurement, to the Universal Time Coordinated, is obtained by means of a suitable signal processing technique. For this implementation, the Interpolated Discrete Fourier Transform has been used as the synchrophasor estimation algorithm. A thorough metrological characterization of the realized prototype in different test conditions proposed by the standards, using a high performance PMU calibrator, is also shown.

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Calibration of Current Transformers in distorted conditions

Cited by 25 publications

References 8 publications

Wideband Self-Calibration Method of Inductive CTs and Verification of Determined Values of Current and Phase Errors at Harmonics for Transformation of Distorted Current

Wideband Self-Calibration Method of Inductive CTs and Verification of Determined Values of Current and Phase Errors at Harmonics for Transformation of Distorted Current

Calibration Procedure to Test the Effects of Multiple Influence Quantities on Low-Power Voltage Transformers

The Design of a Low Cost Phasor Measurement Unit

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