500 kV变电站作业场所工频电磁场强度分析
Analysis on Power Frequency Electric and Magnetic Field Intensity at Workplace of 500 kV Substations
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摘要:
目的 分析不同类型500kV变电站运行人员接触工频电场及工频磁场的强度。 方法 利用PMM 8053A/EHP-50C电磁场强度测试仪检测作业场所工频电场及工频磁场强度,将检测结果与相关标准进行比较。 结果 本次研究共检测148个作业点的工频电场及工频磁场强度,其中44个作业点的工频电场强度大于5 kV/m,其中1个作业点工频电场强度达10 220 V/m;所有作业点中工频磁场强度最大值为35.11 μT;采用时间加权法,计算得出不同类型500 kV变电站运行人员每周56 h接触工频电场强度值分别为738 V/m、481 V/m和144 V/m。 结论 不同类型500 kV变电站运行人员接触工频电场的强度值均符合小于国家职业卫生标准限值的要求,接触工频磁场强度值也均符合小于国家电力行业标准限值的要求。 Abstract:Objective To analyze the power frequency electric and magnetic field intensity exposed to the operators at the workplace of 500 kV substations. Methods The levels of power frequency electric and magnetic fields were measured with PMM 8053A/PMM EHP-50C. The results were compared with relevant standards. Results The power frequency electric and magnetic field intensity of 148 work sites were measured. Among these results, 44 were greater than 5 kV/m in respect of power frequency electric field intensity, and 1 reached 10 220 V/m. The maximum power frequency magnetic field intensity was 35.11 μT. The calculated levels of power frequency electric field exposure in terms of time-weighted strength per week (56 h) were 738 V/m, 481 V/m and 144 V/m in various types of 550 kV substations. Conclusion In these 500 kV substations, the operators' exposure to power frequency electric field meet the national occupational health standards, and their exposure to power frequency magnetic field meet the national power industry requirements.
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