Design, realization and characterization of a high current measurement system with Rogowski coil

Malych, R.; Barczi, O.; Vrabcek, P.

doi:10.1109/cpem.2010.5544161

Cited by 2 publications

(2 citation statements)

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“…Of course, both influence quantities and distorted currents are topics well stressed in literature as far as the Rogowski is involved. In particular, [6][7][8] treat the harmonic analysis and measurement issues related to Rogowski coils, suggesting countermeasures. In [9][10][11][12], instead, the effect of influence quantities like temperature, geometry, magnetic fields, etc., is studied.…”

Section: Introductionmentioning

confidence: 99%

External Magnetic Fields Effect on Harmonics Measurements with Rogowski coils

Mingotti

Costa

Peretto

et al. 2021

2021 IEEE 11th International Workshop on Applied Measurements for Power Systems (AMPS)

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The power quality (PQ) problem is spreading among the distribution network (DN) since intelligent electronic devices (IED) are being installed. Their presence is crucial because they introduce several benefits for the network observability and management. However, the consequent power quality degradation has to be seriously tackled. To this purpose, measurement instruments should be capable of measuring the electrical quantities even in presence of distortion. Furthermore, the new added distortion has to be summed to the typical influence factors affecting the measurement instruments (like temperature, electromagnetic fields, humidity, etc.). Therefore, this paper presents a study on a specific low-power current transformer (LPCT), the Rogowski coil. In detail, the influence of external magnetic fields, on the Rogowski accuracy performance, is evaluated when the device is measuring distorted signals (with an increasing level of distortion). The aim is to study the combined effect of the magnetic fields and of the distorted currents on the measurement performance of a Rogowski coil. Therefore, an ad-hoc measurement setup and tests are developed in this work to assess 3 off-the-shelf Rogowski coils. From the results it can be concluded that the presence of external magnetic fields does not influence the harmonics evaluation, but it does influence the evaluation of the 50 Hz component.

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Section: Introductionmentioning

confidence: 99%

External Magnetic Fields Effect on Harmonics Measurements with Rogowski coils

Mingotti

Costa

Peretto

et al. 2021

2021 IEEE 11th International Workshop on Applied Measurements for Power Systems (AMPS)

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“…serious residual magnetism of the iron core at high currents. In recent years, the Rogowski coil has been attracting new focus because of its wide dynamic range and good linearity [14][15][16][17][18][19][20][21]. However, the Rogowski coil is susceptible to the position of current-carrying conductor and other external factors, such as temperature variation, electromagnetic interference (EMI), and so on.…”

Section: Introductionmentioning

confidence: 99%

A high-current calibration system based on indirect comparison of current transformer and Rogowski coil

Luo

et al. 2013

Meas. Sci. Technol.

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The calibration of the protective current transformer (CT) is of particular importance, since its accuracy at high currents is crucial to the correct operation of the subsequent relay protection devices. Conventional calibration methods have been using an electromagnetic CT which contains an iron core as the standard CT. The iron core is big and difficult to manufacture for high-current measurement, and the serious residual magnetism of the iron core at high currents can lead to excessive measurement errors. This paper proposes a calibration system based on indirect comparison of CT and Rogowski coil, i.e. using an iron-core CT to correct the error of the Rogowski coil at low currents, which may be caused by the position of the current-carrying conductor and so on, and then using the calibrated Rogowski coil as the standard transformer at high currents for its good linearity and wide dynamic range, and there is no magnetic saturation. Since the output of the Rogowski coil needs to be integrated, an improved digital integrator based on direct current (dc) negative feedback is adopted, which can effectively eliminate the influences of temperature drift, time drift and dc offset caused by the analogue circuit. The measurement errors of each part of the calibration system have also been discussed, and the test results show that the accuracy of the system can reach up to the 0.05S Class and the uncertainties are 0.038% for ratio and 0.68′ for phase in the range 500 A to 50 kA.

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Design, realization and characterization of a high current measurement system with Rogowski coil

Cited by 2 publications

References 0 publications

External Magnetic Fields Effect on Harmonics Measurements with Rogowski coils

External Magnetic Fields Effect on Harmonics Measurements with Rogowski coils

A high-current calibration system based on indirect comparison of current transformer and Rogowski coil

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