A Brief Introduction in the Mitigation of Conducted Electromagnetic Interference Issues   M. Buzdugan   2023/07/20

Abstract

This paper deals with the mitigation of the influence of electromagnetic conducted emissions in low voltage grids, which can be performed using different filtering methods. Due to the relatively young age of the electromagnetic compatibility domain, the specific terminology is not yet fully consecrated. That is why the specific literature abounds in a bunch of definitions and notions, incomplete, redundant, or worse, even contradictory. Therefore, all over this paper, the terminology from the successive issues of the standard IEC 60050-161 International Electrotechnical Vocabulary, is used. The introductory section presents generalities regarding the broader context of electromagnetic compatibility in which the paper fit. Section II is devoted to measurement techniques and measuring equipment used in conducted electromagnetic interference tests, specifically for electromagnetic emissions that flow in/from the equipment under test through power lines in the standardized frequency range from 100 kHz to 30 MHz. These measurement techniques and equipment are further used in the next section which presents electromagnetic interference experiments, performed on an induction motor driven by a frequency converter. To mitigate the conducted electromagnetic emissions to fit into the standard limits, a cascade of two EMI filtering cells has been designed and implemented. This demonstrated the usefulness and effectiveness of mains EMI filters in low voltage power applications. The experiment also demonstrated that in some cases it would be necessary to retrofit more than one filtering cell.  

Authors and affiliations

M. Buzdugan
Department of Buildings Engineering. Technical University of Cluj-Napoca. 28 Memorandumului str., 400114, Cluj-Napoca (Romania)

Key words

Electromagnetic compatibility, conducted electromagnetic interference, line impedance stabilization network, spectrum analyzer, EMI passive mains filter.

References

[1] IEC 60050-161 International Electrotechnical Vocabulary, Chapter 161: Electromagnetic compatibility

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[7] IEC 60601-2, Edition 4.0 2014-02, Medical electrical equipment – Part 1-2: General requirements for basic safety and essential performance – Collateral Standard: Electromagnetic disturbances – Requirements and tests

[8] R. L. Ozenbaugh, T.M. Pullen, EMI Filter Design, 3rd Edition, CRC Press, 2017

[9] IEC 61000-6-3, Edition 2.1 2011-02, Electromagnetic compatibility (EMC) –Part 6-3: Generic standards – Emission standard for residential, commercial and light-industrial environments

[10] IEC 61000-6-4, Edition 2.1 2011-02, Electromagnetic compatibility (EMC) –Part 6-3: Generic standards – Emission standard for Industrial Environments