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目的探讨职业人群工频电磁场职业暴露现况。方法对各种存在工频电磁场的工作场所或工作岗位进行工频电场及磁场的测量及统计分析。结果电厂主变及各种高压变电站近20%点电场强度大于5 kV/m,最高达17.46kV/m;部分变压器、变电站电抗器及变电柜工作场所12个点磁场强度大于100μT,手动点焊工作岗位工频磁场集中趋势为492.49μT,最大值为2 092.33μT,94.7%的作业点磁场强度大于100μT。结论电厂主变及各种高压变电站存在高电场强度,手动点焊工人处于高强度工频磁场暴露之中。
Objective To investigate occupational frequency electromagnetic field occupational exposure status. Methods Measurements and statistical analysis of power frequency electric field and magnetic field in various workplaces or workplaces with power frequency electromagnetic fields. Results Nearly 20% electric field strength of main transformer and various high voltage substations is more than 5 kV / m and up to 17.46 kV / m. The magnetic field strength of some transformers, substation reactors and substation cabinets is greater than 100 μT at 12 points, Welding work position frequency magnetic field concentration trend of 492.49μT, the maximum value of 2 092.33μT, 94.7% of the magnetic field intensity greater than 100μT. Conclusion There is a high electric field strength in main transformer and various high voltage substations in power plants. Manual spot welding workers are exposed to high-frequency power frequency magnetic fields.