On the Long-Period Accuracy Behavior of Inductive and Low-Power Instrument Transformers

Mingotti, Alessandro; Bartolomei, Lorenzo; Peretto, Lorenzo; Tinarelli, Roberto

doi:10.3390/s20205810

Cited by 16 publications

(8 citation statements)

References 26 publications

(25 reference statements)

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“…For example, a new method for an online compensation of the temperature effect is presented in [ 28 ] for electronic ITs (EITs). The accuracy behavior over time of low-power ITs (LPITs) is studied in [ 29 ]. Finally, in [ 30 ] the metrological characterization of a calibration system aimed at testing inductive ITs over temperature is described.…”

Section: Influence Quantitiesmentioning

confidence: 99%

Effect of Proximity, Burden, and Position on the Power Quality Accuracy Performance of Rogowski Coils

Mingotti

Costa

Peretto

et al. 2022

Sensors

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Power quality evaluation is the process of assessing the actual power network parameters with respect to the ideal conditions. However, several new assets and devices among the grid include mining the voltage and current quality. For example, the power converters needed for renewable energy sources’ connection to the grid, electric vehicles, etc., are some of the main sources of disturbances that inject high-frequency components into the grid. Consequently, instrument transformers (ITs) should be capable of measuring distorted currents and voltages with the same level of accuracy guaranteed for the ideal frequency (50–60 Hz). This is not a simple task if one considers that several other influence quantities endlessly act on the ITs. To this purpose, considering the lack of a standard, this work presents a measurement setup and specific tests for testing a commonly used type of low-power current transformer, the Rogowski coil (RC). In particular, the accuracy performance (ratio error and phase displacement) of the RCs was evaluated when measuring distorted signals while other influence quantities affected the RCs. Such quantities included positioning, burden, and magnetic field. The results indicate which quantities (or combination of them) have the greatest effect on the RC’s accuracy performance.

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Section: Influence Quantitiesmentioning

confidence: 99%

Effect of Proximity, Burden, and Position on the Power Quality Accuracy Performance of Rogowski Coils

Mingotti

Costa

Peretto

et al. 2022

Sensors

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“…Even newly modernized power stations are widely installed due to their reliability and relatively low cost. Distortion of current and voltage in the power grids causes new requirements regarding operation and transformation accuracy [1][2][3][4][5][6]. Higher harmonics in current may cause inappropriate electricity billing of active and reactive power.…”

Section: Introductionmentioning

confidence: 99%

“…Transformation of distorted current by the CT is an abnormal operating condition. However, to fully evaluate its accuracy, the behavior in the rated conditions should be first analyzed in detail [4]. Therefore, many research activities are focused on developing the methods and conditions and measuring setups to perform the wideband accuracy tests [8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Why Should We Test the Wideband Transformation Accuracy of Inductive Current Transformers?

Stano

Kaczmarek

2022

Energies

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Inductive current transformers are characterized by different transformation accuracies for higher harmonics of distorted primary currents. Therefore, it is highly required to perform the tests of their metrological properties to choose the best unit that ensures the lowest values of current error and phase displacement. This study presents a comparison of two manufactured inductive current transformers. The results indicate that some inductive current transformers may be used to accurately transform distorted currents, enabling proper distortion of power metering and quality evaluation. However, to obtain adequate transformation properties in the wide frequency range, the cross-section of the magnetic core of the inductive current transformer should be oversized. Moreover, it is required to use a permalloy magnetic core instead of the typical transformer steel core. In the analyzed case, the metrological performance depends mainly on its accuracy for transforming the main component of the distorted primary current and self-generation of the low-order higher harmonics. This paper constitutes the starting point to define the limiting values of current error and phase displacement for the future wideband accuracy class extension for inductive CTs.

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“…Consequently, such quantities are tackled in the literature. For example, the effect of temperature and how to treat/compensate is studied in [ 16 , 17 , 18 ]. Humidity has been recently studied by authors in [ 19 ].…”

Section: Introductionmentioning

confidence: 99%

Novel and Simplified Procedure to Test Immunity of Low-Power Voltage Transformers

Mingotti

Peretto

Tinarelli

2022

Sensors

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International technical committees put considerable efforts into the writing process of standards. They always try to find a tradeoff between the rigorous scientific requirements and the practical needs of manufacturers and final users. In addition, researchers keep investigating to improve the existing standards with new procedures, achievements, and findings. The purpose of this work is to contribute to that direction. It introduces a simplified and low-cost procedure to test low-power voltage transformers (LPVTs). The procedure is designed to assess the immunity of LPVTs when subjected to external electric fields. The need for this procedure comes from the existing immunity test, which is efficient but sometimes difficult to implement. The proposed one, instead, is simpler, cheaper, does not require the application of the rated voltage, and can be replicated at all voltage levels. In the paper, the procedure is described and demonstrated with experimental tests. From the results, it is possible to appreciate the validity of the proposed solution and the different ways it could be developed, implemented, and improved.

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On the Long-Period Accuracy Behavior of Inductive and Low-Power Instrument Transformers

Cited by 16 publications

References 26 publications

Effect of Proximity, Burden, and Position on the Power Quality Accuracy Performance of Rogowski Coils

Effect of Proximity, Burden, and Position on the Power Quality Accuracy Performance of Rogowski Coils

Why Should We Test the Wideband Transformation Accuracy of Inductive Current Transformers?

Novel and Simplified Procedure to Test Immunity of Low-Power Voltage Transformers

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