Development of Waveform Reconstruction Method with Current Transformer Saturation

Urano, Shoichi; Yamada, Takeshi; Ooura, Yoshifumi; Xu, Youheng; Yamaguchi, Yasutaka; Fujiuchi, Shigeyoshi; Makimura, Tatsuya

doi:10.1541/ieejpes.129.15

Cited by 5 publications

(2 citation statements)

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“…Consequently, the measurement accuracy significantly deteriorates 4,5) . Methods of compensating for accuracy and recovering from waveforms that include distortion have been reported to address such problems [6][7][8] . However, these methods are expensive because they require sophisticated signal processing by microcomputers.…”

Section: Introductionmentioning

confidence: 99%

Development of a Wide-range Current Sensor with Regularly Arrayed Magnetic Pieces

et al. 2014

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Current transformers and Rogowski coils are used to measure electric current in power distribution equipments. In recent years, wide-range current sensors have had strong demands to standardize current sensors in those various equipments. However, it has been difficult to make a trade-off between the sensitivity and the size of a conventional current sensors. To overcome the difficulty, we developed a new current sensor where magnetic pieces are regularly arrayed inside the Rogowski coil. We made a comparative evaluation of the performances of the conventional and developed sensors with magnetic field analysis, and we achieved that the S/N ratio of the developed sensor was approximately 4.5 times higher than that of a Rogowski coil, and that the developed sensor had the measurement range of the current approximately 8 times wider than common current transformers. We also built a prototype which has the precision of the current sensing comparable to conventional current transformers.

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Section: Introductionmentioning

confidence: 99%

Development of a Wide-range Current Sensor with Regularly Arrayed Magnetic Pieces

et al. 2014

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“…The above methods assume that T s and T e can be estimated from current waveforms, but as will be shown below using actual waveforms, excessive inrush currents induce CT saturation so that the current drops to zero at T e and estimation becomes impossible. Furthermore, in distribution networks with complex and diverse customer profiles, it may be impossible to determine the customers whose transformers produce inrush currents, and inrush current waveforms may prove to be unobtainable.…”

Section: Introductionmentioning

confidence: 99%

An Identification Method of Magnetizing Inrush Current Phenomena by Voltage Waveform

Naitoh

Takeda

Toyama

et al. 2013

Electrical Engineering Japan

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Summary In this paper, the authors propose a new method for identification of magnetizing inrush current phenomena. In general, the identification is performed using the current waveform. However, saturation of current transformers makes it impossible to obtain such a waveform. Therefore, the authors introduce an identification method using the voltage waveform, in which the transformer saturation voltage does not occur. By applying Aitken's Δ2 process, it is shown that the new identification method gives accurate saturation start and end times.

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An Identification Method of Magnetizing Inrush Current Phenomena in Distribution System using with Aitken's <i>Δ</i><sup>2</sup>-process

et al. 2011

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In this paper, the authors propose an improved identification method of the magnetizing inrush current phenomena. To improve the estimation of the saturation on/off time, the Aitken's Δ 2 -process is adopted. And a new index δI, which is a variation current, is introduced. The merits of Aitken's Δ 2 -process are the simple algorithm and the high precision to oscillation noise. Then, the proposed method is adapted to a measured data, in which the oscillation noise is caused. The proposed method gives a high precision in these cases.

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Development of Waveform Reconstruction Method with Current Transformer Saturation

Cited by 5 publications

References 4 publications

Development of a Wide-range Current Sensor with Regularly Arrayed Magnetic Pieces

Development of a Wide-range Current Sensor with Regularly Arrayed Magnetic Pieces

An Identification Method of Magnetizing Inrush Current Phenomena by Voltage Waveform

An Identification Method of Magnetizing Inrush Current Phenomena in Distribution System using with Aitken's <i>Δ</i><sup>2</sup>-process

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Development of Waveform Reconstruction Method with Current Transformer Saturation

Cited by 5 publications

References 4 publications

Development of a Wide-range Current Sensor with Regularly Arrayed Magnetic Pieces

Development of a Wide-range Current Sensor with Regularly Arrayed Magnetic Pieces

An Identification Method of Magnetizing Inrush Current Phenomena by Voltage Waveform

An Identification Method of Magnetizing Inrush Current Phenomena in Distribution System using with Aitken's <i>&Delta;</i><sup>2</sup>-process

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An Identification Method of Magnetizing Inrush Current Phenomena in Distribution System using with Aitken's <i>Δ</i><sup>2</sup>-process