特高压同塔双回交流输电线路下方钢架大棚暂态电击特性研究

Transient Electric Shock Characteristics of Steel Frame Sheds Underneath UHV Twin-tower AC Transmission Lines

我国正在大力发展特高压交流输变电工程,随着电压等级的提高,线路附近区域会发生人体暂态电击现象,容易给线路附近居民的生产生活造成困扰和不悦。文章针对常见的线下钢架大棚场景展开研究,建立了1 000 kV特高压同塔双回交流输电线路下方钢架大棚对人体的暂态电击放电模型,计算了空间电位分布、人体感应电势以及暂态电击电流等特征量,并探讨了大棚不同接地方式下人体受到暂态电击时放电电流的变化规律。研究表明,对于接地良好的金属大棚,人体暂态电击感受随着人体对地绝缘程度的增加而增加;对于接地人体,大棚接地效果越差人体暂态电击感受越强烈。本研究内容对于线下大棚静电感应防治具有一定指导意义。

China is vigorously developing UHV AC transmission and transformation projects, with the increase in voltage level, the human body transient electric shock phenomenon in the area near the line, easy to cause distress and unhappiness to the production and life of residents near the line. The author researches the underline steel shed scenario, establishes the transient electric shock discharge model for the human in the steel shed under the UHV twin-tower AC transmission lines, calculates the spatial potential distribution, human induced potential and transient electric shock current and other characteristic quantities, and discusses the change law of the discharge current when the human body is subjected to transient electric shock under different grounding methods of the shed. Research shows that for a well grounded metal shed, the human transient electric shock sensation increases with the increase in the degree of insulation of the human body to the ground;for the grounded human body, the poorer the shed grounding effect the stronger the human transient electric shock sensation. The research content has some guiding significance for the prevention and control of static electricity induction in the shed under the line.