Passive Techniques for Magnetic Field Mitigation in Underground Power Systems

2023 · Benefit · Low evidence

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BenefitLow evidencePaper 454

Study snapshot

Publicationmanual · 2023

Study typeengineering

Reported directionBenefit

Evidence ratingLow

Abstract

Passive Techniques for Magnetic Field Mitigation in Underground Power Systems Lamkitja S, Tarateeraseth V. Passive Techniques for Magnetic Field Mitigation in Underground Power Systems. 2023 20th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON), Nakhon Phanom, Thailand, 2023, pp. 1-4, doi: 10.1109/ECTI-CON58255.2023.10153381. Abstract This research proposes passive techniques for magnetic field mitigation in the 69/115 kV underground power system installed by the Metropolitan Electricity Authority (MEA). The passive techniques which are: conductive loop, conductive shield, and ferromagnetic shield were designed and simulated by using the Finite Element Method Magnetics (FEMM) program. A comparison of the magnetic field with and without a mitigation system is obtained. Finally, the simulation results show that all passive techniques can reduce the magnetic field values to be lower than the reference value given by the International Commission on Non-Ionizing Radiation Protection (ICNIRP) and European standards. Conclusions This paper shows using passive techniques to mitigate the low-frequency magnetic field of the 69/115 kV underground power system installed by MEA. The results are limited by the construction condition mentioned above. All techniques can reduce the magnetic field to be lower than 10 μT. The conductive and ferromagnetic shield can mitigate more magnetic fields than using the conductive loop. Considering the shield materials, the steel100 shield is much thicker than the aluminum shield but the mitigated result is less. However, a ferromagnetic shield has a high risk of failure of the shield because the ferromagnetic material is more fragile and breaks easily. ieeexplore.ieee.org

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AI evidence extraction

Structured fields below were generated from the paper’s abstract and metadata to make the evidence easier to inspect. Automated extraction may be incomplete or incorrect; verify important details against the original paper.

Study typeengineering

Effect directionbenefit

PopulationNot supplied

Sample sizeNot supplied

ExposureELF

Evidence strengthLowConfidence: 74% · Peer reviewed: unknown

Main findings

Finite-element simulations (FEMM) compared magnetic fields with and without passive mitigation (conductive loop, conductive shield, ferromagnetic shield) for a 69/115 kV underground power system. All simulated techniques reduced magnetic field values to below the referenced ICNIRP/European standards, with results reported as below 10 µT; conductive and ferromagnetic shields mitigated more than a conductive loop.

Outcomes measured

Magnetic field level reduction (µT)
Compliance with ICNIRP and European reference values

Limitations

Simulation study (FEMM) rather than field measurements
Results stated to be limited by construction conditions (not further specified in abstract)
No quantitative baseline field values reported in the abstract beyond the post-mitigation level (<10 µT)

View raw extracted JSON

{
  "study_type": "engineering",
  "exposure": {
    "band": "ELF",
    "source": "underground power system (69/115 kV cables)",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": null,
  "sample_size": null,
  "outcomes": [
    "Magnetic field level reduction (µT)",
    "Compliance with ICNIRP and European reference values"
  ],
  "main_findings": "Finite-element simulations (FEMM) compared magnetic fields with and without passive mitigation (conductive loop, conductive shield, ferromagnetic shield) for a 69/115 kV underground power system. All simulated techniques reduced magnetic field values to below the referenced ICNIRP/European standards, with results reported as below 10 µT; conductive and ferromagnetic shields mitigated more than a conductive loop.",
  "effect_direction": "benefit",
  "limitations": [
    "Simulation study (FEMM) rather than field measurements",
    "Results stated to be limited by construction conditions (not further specified in abstract)",
    "No quantitative baseline field values reported in the abstract beyond the post-mitigation level (<10 µT)"
  ],
  "evidence_strength": "low",
  "confidence": 0.74,
  "peer_reviewed_likely": "unknown",
  "keywords": [
    "magnetic field mitigation",
    "underground power system",
    "69 kV",
    "115 kV",
    "ELF magnetic fields",
    "conductive loop",
    "conductive shield",
    "ferromagnetic shield",
    "FEMM",
    "ICNIRP",
    "European standards"
  ],
  "suggested_hubs": [
    {
      "slug": "occupational-exposure",
      "weight": 0.25,
      "reason": "Focuses on mitigation of low-frequency magnetic fields from power infrastructure; potentially relevant to occupational/public exposure near underground cables."
    },
    {
      "slug": "who-icnirp",
      "weight": 0.55,
      "reason": "Explicitly references ICNIRP reference values/standards for magnetic field limits."
    }
  ]
}

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AI-extracted fields are generated from the abstract and metadata and may be incomplete or incorrect. This material is for informational purposes and is not medical advice.

Identifiers and source

DOI: 10.1109/ecti-con58255.2023.10153381
PubMed: Not supplied

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