Influence of magnetic permeability in phase error of current transformers with nanocrystalline alloys cores

Batista, Thiago C.; Luciano, Benedito Antonio; Freire, Raimundo C. S.; Castro, Walman Benı́cio de; Araújo, Edcleide Maria

doi:10.1016/j.jallcom.2013.11.110

Cited by 6 publications

(2 citation statements)

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“…The current transformer with the magnetic core of the AMET-5V type does not satisfy the measurement accuracy with respect to the angular error (in certain situations, especially for the 0.2S accuracy class, the magnetic properties of nanocrystalline iron-based alloys are insufficient [9]), and also does not satisfy the requirement for the maximum safety factor. An increase in the magnetic core section in order to reduce the angular error is impossible, since this will lead to an even greater safety factor.…”

Section: Discussionmentioning

confidence: 99%

The calculate of current transformers with combined magnetic cores

Batrashov

Stepanskaya

2021

E3S Web Conf.

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The manufacture of current transformers is associated with many design constraints, which include the restricted dimensions of its installation places, requirements for the accuracy class, as well as the limitation on the safety factor or the minimum factor of the accuracy limit factor. In a design sense of current transformers, these requirements are contradictory, which resulting in a flexible approach to the manufacture of current transformers. The use of combined magnetic cores can be referred to one of these areas, in other words magnetic cores consisting of materials with different magnetic properties, which allows to obtain unique magnetic properties that are inaccessible when using magnetic cores of the same type (material), thus providing a rational model of production. The article presents a feature of calculating of current transformer with combined magnetic cores.

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Section: Discussionmentioning

confidence: 99%

The calculate of current transformers with combined magnetic cores

Batrashov

Stepanskaya

2021

E3S Web Conf.

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“…Obtained results of the accuracy tests of wideband transformation indicate the same requirements for current errors at harmonics, as defined in the standard IEC 61869-2 for sinusoidal current and a given accuracy class [13]. This mainly results from low-frequency-dependent properties of the magnetic core [14,15]. Moreover, transformation of distorted currents may cause its saturation [16][17][18][19].…”

Section: Introductionmentioning

confidence: 86%

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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