The Method to Determine the Turns Ratio Correction of the Inductive Current Transformer

Stano, Ernest

doi:10.3390/en14248602

Cited by 14 publications

(13 citation statements)

References 27 publications

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“…In these conditions, the highest current error values occurred for 120% I 1N and 25% S N . Moreover, the applied correction of turns of the secondary winding caused a shift of the current error value in a positive direction [26]. As the load on the secondary winding increased, the current error values moved toward a negative value.…”

Section: Metrological Performance Of the Cts In A Wide Frequency Rangementioning

confidence: 97%

“…In other cases, its primary winding must be fed by a rated current, which may be generated by a step-up current transformer with a wideband power amplifier [22][23][24]. The results and analysis in [25] are helpful to understand the course of the wideband metrological characteristics of a corrected inductive CT [26]. The proposed vectorial diagrams define the components conditioning the values of the current error and phase displacement of the harmonic of the specified distorted current.…”

Section: Introductionmentioning

confidence: 99%

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The Effect of the Load Power Factor of the Inductive CT’s Secondary Winding on Its Distorted Current’s Harmonics Transformation Accuracy

Kaczmarek

Stano

2022

Energies

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In this paper, we present an investigation into the influence of the load power factor of secondary winding on the metrological performance of inductive CTs with frequencies from 50 Hz to 5 kHz of the harmonic of a transformed distorted current. The results clearly indicated that the inductive load caused a deterioration in the transformation accuracy of the inductive CT. To ensure the most advantageous conditions of their operation, a resistive load should be used. The inductive CTs for the frequencies of the transformed harmonic of a distorted primary current from 50 Hz to 5 kHz may ensure the accuracy class designated for the transformation of the sinusoidal current of a frequency of 50 Hz with the same limiting values of errors. Moreover, an analysis of the generated low-order harmonics by a 300 A/5 A CT determined for the power factor of 0.8 inductive and 1.0 of the secondary winding was investigated. These results for the transformed distorted currents of 3rd, 5th and 7th higher harmonics were evaluated for a rated load and 25% of this value.

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Section: Metrological Performance Of the Cts In A Wide Frequency Rangementioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

The Effect of the Load Power Factor of the Inductive CT’s Secondary Winding on Its Distorted Current’s Harmonics Transformation Accuracy

Kaczmarek

Stano

2022

Energies

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“…Also, for the decreased load of the secondary winding, the high me performance of the ICT 1 is retained. The positive values of current error deter ICT 2 results from applied turns number correction, where the real turns ratio is to the rated current ratio [30]. The ICT 1 is not corrected.…”

Section: Metrological Performance Of the Cts In The Wide Frequencies ...mentioning

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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“…There are two common methods for achieving decimal-turn windings [16]. One method is to wind multiple wires in parallel, but the turns of different wires may be one turn different, so that the number of equivalent secondary turns will be a decimal or a fraction.…”

Section: Turns Ratio In Appropriate Less Than Current Ratio Achieves ...mentioning

confidence: 99%

Difficulties in producing CT caused by the current ratio regulation in IEC standard and suggestions of modification

Gan,

You,

Duan

et al. 2024

Meas. Sci. Technol.

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The integer current ratio requirements by standard IEC 61869-2 and users result in the numbers of current transformer (CT) winding turns being decimal, such as 5.94, 9.9, and 14.85. This makes the manufacturing of CTs complex, causing socioeconomic waste. It is pointed out in this paper that if the integer current ratio requirements can be changed to decimals, the number of CT winding turns may be made an integer, which makes it easy to produce low-error CTs. The error refers to the difference between the actual current ratio and the required current ratio for CTs. Additionally, if this change is made, iron core materials do not need to have high permeability. Furthermore, it is better to allow the manufacturers to mark freely the current ratio within a certain range on CT rating plates. The measure of changing the current ratio requirements or changing the way of marking the ratio on rating plates can significantly reduce the manufacturing difficulties and costs of CTs.

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The Method to Determine the Turns Ratio Correction of the Inductive Current Transformer

Cited by 14 publications

References 27 publications

The Effect of the Load Power Factor of the Inductive CT’s Secondary Winding on Its Distorted Current’s Harmonics Transformation Accuracy

The Effect of the Load Power Factor of the Inductive CT’s Secondary Winding on Its Distorted Current’s Harmonics Transformation Accuracy

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

Difficulties in producing CT caused by the current ratio regulation in IEC standard and suggestions of modification

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