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Influence of Asymmetric Three-Phase Cable Cross-Sections on Conducted Emission Measurements

Author

Listed:
  • Ludovica Illiano

    (Department of Electronics, Information and Bioengineering (DEIB), Politecnico di Milano, 20133 Milan, Italy)

  • Xinglong Wu

    (Department of Electronics, Information and Bioengineering (DEIB), Politecnico di Milano, 20133 Milan, Italy)

  • Flavia Grassi

    (Department of Electronics, Information and Bioengineering (DEIB), Politecnico di Milano, 20133 Milan, Italy)

  • Sergio Amedeo Pignari

    (Department of Electronics, Information and Bioengineering (DEIB), Politecnico di Milano, 20133 Milan, Italy)

Abstract

This work presents a frequency-domain and modal-domain model to analyze how the length of a three-phase power cable influences conducted emission (CE) voltages measured through a line impedance stabilization network (LISN). The measurement setup considered consists of an equipment under test (EUT) connected to the LISN via a power cable whose cross-section is defined in this study as quadrilateral, namely, four conductors arranged at the corners of a quadrilateral: typically the three phases and the protective earth or neutral conductor. The cable is modeled as a multiconductor transmission line (MTL). To evaluate the system performance both with and without the cable, the concept of voltage insertion ratio ( IR ) is introduced, defined as the reciprocal of the typical insertion loss. Closed-form expressions are derived for both common mode (CM) and differential mode (DM) emissions. The objective is twofold: to understand under which conditions the LISN measurements overestimate or underestimate the actual emissions at the EUT terminals, and to provide a predictive tool to assess the impact of electrically long cables on CE measurements. The model is validated through numerical simulations of quadrilateral cable configurations considering both a homogeneous and inhomogeneous cross-section, highlighting the need to account for cable length in system design and EMC test interpretation.

Suggested Citation

  • Ludovica Illiano & Xinglong Wu & Flavia Grassi & Sergio Amedeo Pignari, 2025. "Influence of Asymmetric Three-Phase Cable Cross-Sections on Conducted Emission Measurements," Energies, MDPI, vol. 18(17), pages 1-21, September.
    • Handle: RePEc:gam:jeners:v:18:y:2025:i:17:p:4720-:d:1742579
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    References listed on IDEAS

    as
    1. Sanghwa Park & Euibum Lee & Yeong-Hoon Noh & Dong-Hoon Choi & Jong-gwan Yook, 2023. "Accurate Modeling of CCS Combo Type 1 Cable and Its Communication Performance Analysis for High-Speed EV-EVSE Charging System," Energies, MDPI, vol. 16(16), pages 1-16, August.
    2. Ludovica Illiano & Xiaokang Liu & Xinglong Wu & Flavia Grassi & Sergio Amedeo Pignari, 2024. "Signal Order Optimization of Interconnects Enabling High Electromagnetic Compatibility Performance in Modern Electrical Systems," Energies, MDPI, vol. 17(11), pages 1-16, June.
    3. Per Widek & Mats Alaküla, 2025. "Methods for the Investigation and Mitigation of Conducted Differential-Mode Electromagnetic Interference in Commercial Electrical Vehicles," Energies, MDPI, vol. 18(4), pages 1-33, February.
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