Investigating the role of internal layout of magnetic field-generating equipment on workers' exposure at power substations

Abstract

Investigating the role of internal layout of magnetic field-generating equipment on workers' exposure at power substations Hosseini M, Farhang Matin L, Monazzam MR, Khosroabadi H. Investigating the role of internal layout of magnetic field-generating equipment on workers' exposure at power substations. Int J Occup Saf Ergon. 2018 Sep 12:1-7. doi: 10.1080/10803548.2018.1475927. Abstract INTRODUCTION: This research is an attempt to show the role of interior layout of equipment in generating magnetic fields. MATERIALS AND METHODS: The levels of an extremely low-frequency magnetic field were measured in accordance with Standard No. IEEE 644:1994 in three substations and a control building in a petrochemical power plant in southern Iran. Then, workers' occupational exposure (time-weighted average [TWA]) was calculated and the sources of maximum magnetic field generation at each place were identified. Their interior design was changed to achieve the optimal layout of equipment subsequently; the workers' TWA was recalculated for the new situation. RESULTS: The obtained results showed that electrical engineers and technicians were exposed to the maximum TWA of 10.14 μT. The operators in the control room were exposed to the lowest TWA of 0.84 μT. The results also showed that after the change of interior design and proper layout design of the equipment in the substations, the TWA was reduced by 0.73 μT. CONCLUSION: The research findings revealed that the most harmonious arrangement of equipment in an industrial unit plays a major role in reducing the exposure of workers to magnetic fields and ultimately increases the level of their health in the workplace. ncbi.nlm.nih.gov

AI evidence extraction

Main findings

ELF magnetic fields were measured in three substations and a control building, and workers' time-weighted average (TWA) exposure was calculated. Electrical engineers and technicians had a maximum TWA of 10.14 μT, control room operators had the lowest TWA of 0.84 μT, and after changing the interior layout of equipment the TWA was reduced by 0.73 μT.

Outcomes measured

• Extremely low-frequency magnetic field levels (μT)
• Workers' occupational exposure (time-weighted average, TWA) before vs after equipment layout change

Limitations

• Sample size not reported in the abstract
• Frequency of the ELF field not specified in the abstract
• No health outcomes measured; exposure metrics only
• Details of the layout intervention and statistical analysis not provided in the abstract

Suggested hubs

• occupational-exposure (0.95)
  Study measures and models workers' occupational ELF magnetic-field exposure in substations and evaluates an engineering/layout change to reduce exposure.

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    "study_type": "exposure_assessment",
    "exposure": {
        "band": "ELF",
        "source": "occupational",
        "frequency_mhz": null,
        "sar_wkg": null,
        "duration": null
    },
    "population": "Workers at power substations (electrical engineers, technicians, operators) in a petrochemical power plant in southern Iran",
    "sample_size": null,
    "outcomes": [
        "Extremely low-frequency magnetic field levels (μT)",
        "Workers' occupational exposure (time-weighted average, TWA) before vs after equipment layout change"
    ],
    "main_findings": "ELF magnetic fields were measured in three substations and a control building, and workers' time-weighted average (TWA) exposure was calculated. Electrical engineers and technicians had a maximum TWA of 10.14 μT, control room operators had the lowest TWA of 0.84 μT, and after changing the interior layout of equipment the TWA was reduced by 0.73 μT.",
    "effect_direction": "benefit",
    "limitations": [
        "Sample size not reported in the abstract",
        "Frequency of the ELF field not specified in the abstract",
        "No health outcomes measured; exposure metrics only",
        "Details of the layout intervention and statistical analysis not provided in the abstract"
    ],
    "evidence_strength": "low",
    "confidence": 0.7399999999999999911182158029987476766109466552734375,
    "peer_reviewed_likely": "yes",
    "keywords": [
        "extremely low-frequency",
        "magnetic field",
        "occupational exposure",
        "power substation",
        "time-weighted average",
        "TWA",
        "equipment layout",
        "IEEE 644:1994",
        "petrochemical power plant",
        "Iran"
    ],
    "suggested_hubs": [
        {
            "slug": "occupational-exposure",
            "weight": 0.9499999999999999555910790149937383830547332763671875,
            "reason": "Study measures and models workers' occupational ELF magnetic-field exposure in substations and evaluates an engineering/layout change to reduce exposure."
        }
    ]
}

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