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Sensors
Volume 20
Issue 3
10.3390/s20030927
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Article

Are Inductive Current Transformers Performance Really Affected by Actual Distorted Network Conditions? An Experimental Case Study

by
Alessandro Mingotti
*,
Lorenzo Peretto
,
Lorenzo Bartolomei
,
Diego Cavaliere
and
Roberto Tinarelli
Department of Electrical, Electronic and Information Engineering–Guglielmo Marconi, Alma Mater Studiorum, University of Bologna, 40136 Bologna, Italy
*
Author to whom correspondence should be addressed.
Sensors 2020, 20(3), 927; https://doi.org/10.3390/s20030927
Received: 15 January 2020 / Revised: 7 February 2020 / Accepted: 8 February 2020 / Published: 10 February 2020
(This article belongs to the Special Issue Selected papers from the 2019 IEEE International Worshop on Metrology for Industry 4.0 and IoT)
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Abstract

The aim of this work is to assess whether actual distorted conditions of the network are really affecting the accuracy of inductive current transformers. The study started from the need to evaluate the accuracy performance of inductive current transformers in off-nominal conditions, and to improve the related standards. In fact, standards do not provide a uniform set of distorted waveforms to be applied on inductive or low-power instrument transformers. Moreover, there is no agreement yet, among the experts, about how to evaluate the uncertainty of the instrument transformer when the operating conditions are different from the rated ones. To this purpose, the authors collected currents from the power network and injected them into two off-the-shelf current transformers. Then, their accuracy performances have been evaluated by means of the well-known composite error index and an approximated version of it. The obtained results show that under realistic non-rated conditions of the network, the tested transformers show a very good behavior considering their nonlinear nature, arising the question in the title. A secondary result is that the use of the composite error should be more and more supported by the standards, considering its effectiveness in the accuracy evaluation of instrument transformers for measuring purposes. View Full-Text
Keywords: actual waveforms; inductive current transformers; measurement setup; composite error; accuracy; uncertainty; electrical measurements; total harmonic distortion actual waveforms; inductive current transformers; measurement setup; composite error; accuracy; uncertainty; electrical measurements; total harmonic distortion
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MDPI and ACS Style

Mingotti, A.; Peretto, L.; Bartolomei, L.; Cavaliere, D.; Tinarelli, R. Are Inductive Current Transformers Performance Really Affected by Actual Distorted Network Conditions? An Experimental Case Study. Sensors 2020, 20, 927. https://doi.org/10.3390/s20030927

AMA Style

Mingotti A, Peretto L, Bartolomei L, Cavaliere D, Tinarelli R. Are Inductive Current Transformers Performance Really Affected by Actual Distorted Network Conditions? An Experimental Case Study. Sensors. 2020; 20(3):927. https://doi.org/10.3390/s20030927

Chicago/Turabian Style

Mingotti, Alessandro, Lorenzo Peretto, Lorenzo Bartolomei, Diego Cavaliere, and Roberto Tinarelli. 2020. "Are Inductive Current Transformers Performance Really Affected by Actual Distorted Network Conditions? An Experimental Case Study" Sensors 20, no. 3: 927. https://doi.org/10.3390/s20030927

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