沿海地区500kV变电站电磁环境分布与防护措施

Electromagnetic Environment Distribution of 500kV Substations in Coastal Areas and Protective Measures

针对沿海某城市高压变电站日益增多的情况,研究了该地区500 kV变电站内工频电磁场环境分布特点。在实测某沿海城市500 kV全户外变电站和混合式气体绝缘金属封闭开关设备变电站内各区域和设备周围的工频电场强度和磁场强度的基础上,通过统计、归纳和分析,得到了高压变电站的电磁环境分布特点和职业暴露关键控制区域,并通过仿真分析加以验证。结果表明:该地区500 kV变电站内工频电磁环境整体较好,其中电场强度较大的区域主要集中在500 kV开关场,而工频磁场超标区域主要为电抗器区域且关键暴露位置集中于母线边相外侧、开关设备、电压互感器、电流互感器等处。从职业安全的角度提出相应的防护措施:增加防护距离、控制接触时间、穿着屏蔽服。

In allusion to the situation of increasing high voltage substations in one coastal city, this paper studies distribution characteristics of working frequency electromagnetic filed environment in 500 kV substations in this area. On the basis of measuring working frequency electric field intensity and magnetic field intensity in each region of 5-10 kV outdoor substations in one coastal city and hybrid GIS substations as well as around equipment, it counts, concludes and analyzes distribution characteristics of electromagnetic environment in high voltage substations and critical control zones for occupational expo- sure, which have been verified by simulating analysis. Results indicate that integrated working frequency electromagnetic en- vironment in 500 kV substations in this area is preferable, regions with larger electric field intensity arc mainly in 500 kV switchyards, while regions with excessive working frequency magnetic filed are electric reactor zones and critical exposure positions concentrate in outside phase of bus, switch devices, voltage transformers, current transformers, and so on. In as- pect of occupational safety, it also presents relevant protective measures such as increasing protection distance, controlling touch time and wearing shielding clothes.