特高压变电站人体工频电场暴露水平评估

Evaluation of Human Exposure to Power Frequency Electric Fields Induced by UHV Substation

人体在特高压变电站内的工频电场暴露水平一直受到研究人员的关注,但相关研究却并不多见。以特高压长治站为研究对象,采用ANSYS谐响应分析方法,通过子模型技术实现了特高压变电站内含人体空间域的工频电场分布计算。研究了人体的电位、电场强度和电流密度分布及鞋子的影响;对比了站内不同路径上电场分布的数值计算结果与实地测量结果以及人体内部电流的数值计算结果与理论公式计算结果;验证了所用计算方法的正确性与所得计算结果的准确性。研究结果表明:人体内部以传导电流为主,最大感应电流密度为9.15 mA/m2,满足职业标准。该研究成果可以判定特高压变电站内工频电场对人体是否安全并为后续工程提供参考。

The influence that from power frequency electromagnetic fields induced by ultra high voltage （UHV） substation to human body has always been concerned by researchers, but related research has rarely been reported. This paper chose to study UHV Changzhi substation, by using ANSYS harmonic analysis and submodeling technology, the power frequency electric field calculation for UHV substation containing human model was achieved. The electric field, potential, current density of human body and the effect of shoes were studied; the numerical and measurement results on the electric field distribution along several paths in substation, the numerical and theoretical results on the current distribution inside human body were compared, respectively; the correctness of method and the accuracy of results were validated. Based on the results, the induced current inside human body is mainly conduction current, the maximum induced current density is 9.15mA/m^2, which could meet professional standard. Conclusion of the thesis can be used to judge whether power frequency electric fields induced by UHV substation were safe for human body and be referenced by future UHV projects.