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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