50 Hz Temporal Magnetic Field Monitoring from High-Voltage Power Lines: Sensor Design and Experimental Validation.

PAPER pubmed Sensors (Basel, Switzerland) 2024 Engineering / measurement Effect: unclear Evidence: Insufficient

Read original paper → DOI: 10.3390/s24165325 PMID: 39205019 Evidence Lab

Abstract

A low-cost, tri-axial 50 Hz magnetic field monitoring sensor was designed, calibrated and verified. The sensor was designed using off-the-shelf components and commercially available coils. It can measure 50 Hz magnetic fields originating from high-voltage power lines from 0.08 µT to 364 µT, divided into two measurement ranges. The sensor was calibrated both on-board and in-lab. The on-board calibration takes the circuit attenuation, noise and parasitic components into account. In the in-lab calibration, the output of the developed sensor is compared to the benchmark, a narrowband EHP-50. The sensor was then verified in situ under high-voltage power lines at two independent measurement locations. The measured field values during this validation were between 0.10 µT and 13.43 µT, which is in agreement with other reported measurement values under high-voltage power lines in literature. The results were compared to the benchmark, for which average deviations of 6.2% and 1.4% were found, at the two independent measurement locations. Furthermore, fields up to 113.3 µT were measured in a power distribution sub-station to ensure that both measurement ranges were verified. Our network, four active sensors in the field, had high uptimes of 96%, 82%, 81% and, 95% during a minimum 3-month interval. In total, over 6 million samples were gathered with field values that ranged from 0.08 µT to 45.48 µT. This suggests that the proposed solution can be used for this monitoring, although more extensive long-term testing with more sensors is required to confirm the uptime under multiple circumstances.

AI evidence extraction

At a glance

Study type

Engineering / measurement

Effect direction

unclear

Population

—

Sample size

—

Exposure

ELF high-voltage power lines · minimum 3-month interval (network uptime monitoring)

Evidence strength

Insufficient

Confidence: 86% · Peer-reviewed: yes

Main findings

A low-cost tri-axial 50 Hz magnetic field sensor was designed and calibrated, with a stated measurement capability from 0.08 µT to 364 µT across two ranges. In situ validation under high-voltage power lines at two locations measured 0.10–13.43 µT and showed average deviations versus a narrowband EHP-50 benchmark of 6.2% and 1.4%; additional verification in a sub-station measured up to 113.3 µT. A four-sensor field network achieved uptimes of 96%, 82%, 81%, and 95% over at least 3 months and collected over 6 million samples (0.08–45.48 µT).

Outcomes measured

Sensor design for 50 Hz magnetic field monitoring
Calibration performance vs benchmark (EHP-50)
In situ validation under high-voltage power lines (field measurements)
Network uptime and sample collection performance

Limitations

More extensive long-term testing with more sensors is required to confirm uptime under multiple circumstances (as stated by authors).
Validation reported at two independent measurement locations under high-voltage power lines.

Suggested hubs

occupational-exposure (0.35)
Exposure assessment/monitoring of 50 Hz magnetic fields in environments including power distribution sub-stations and under high-voltage power lines.

View raw extracted JSON

{
    "study_type": "engineering",
    "exposure": {
        "band": "ELF",
        "source": "high-voltage power lines",
        "frequency_mhz": null,
        "sar_wkg": null,
        "duration": "minimum 3-month interval (network uptime monitoring)"
    },
    "population": null,
    "sample_size": null,
    "outcomes": [
        "Sensor design for 50 Hz magnetic field monitoring",
        "Calibration performance vs benchmark (EHP-50)",
        "In situ validation under high-voltage power lines (field measurements)",
        "Network uptime and sample collection performance"
    ],
    "main_findings": "A low-cost tri-axial 50 Hz magnetic field sensor was designed and calibrated, with a stated measurement capability from 0.08 µT to 364 µT across two ranges. In situ validation under high-voltage power lines at two locations measured 0.10–13.43 µT and showed average deviations versus a narrowband EHP-50 benchmark of 6.2% and 1.4%; additional verification in a sub-station measured up to 113.3 µT. A four-sensor field network achieved uptimes of 96%, 82%, 81%, and 95% over at least 3 months and collected over 6 million samples (0.08–45.48 µT).",
    "effect_direction": "unclear",
    "limitations": [
        "More extensive long-term testing with more sensors is required to confirm uptime under multiple circumstances (as stated by authors).",
        "Validation reported at two independent measurement locations under high-voltage power lines."
    ],
    "evidence_strength": "insufficient",
    "confidence": 0.85999999999999998667732370449812151491641998291015625,
    "peer_reviewed_likely": "yes",
    "keywords": [
        "50 Hz",
        "ELF magnetic field",
        "tri-axial sensor",
        "monitoring",
        "high-voltage power lines",
        "calibration",
        "EHP-50",
        "sub-station",
        "uptime",
        "µT"
    ],
    "suggested_hubs": [
        {
            "slug": "occupational-exposure",
            "weight": 0.34999999999999997779553950749686919152736663818359375,
            "reason": "Exposure assessment/monitoring of 50 Hz magnetic fields in environments including power distribution sub-stations and under high-voltage power lines."
        }
    ]
}

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

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