高压装配式变电站建筑物防雷接地结构设计优化

Optimization of Lightning Protection and Grounding Structure Design for High Voltage Prefabricated Substation Buildings

防雷接地结构是高压装配式变电站建筑物的重要组成部分,对保护建筑物内电气设备与人员安全具有重要作用。现有结构防雷效果较差,100kA雷电流下建筑物最大冲击接触电势和跨步电压比较高,因此应优化设计高压装配式变电站建筑物防雷接地结构。在变电站建筑物预制女儿墙中增设接闪器,并在预制墙体后浇带中布设竖向钢筋作为接地引下线,与接闪器连接,在预制墙体门、窗结构上安装接地板,优化等电位接地装置,以实现高压装配式变电站建筑物防雷接地结构设计优化。实例分析结果表明,优化后100kA雷电流下建筑物最大冲击接触电势和跨步电压明显降低,符合规范要求,具有良好的防雷效果。

The lightning protection grounding structure is an important component of high-voltage prefabricated substation buildings,it plays an important role in protecting the safety of electrical equipment and people inside buildings,however,the existing structure has poor lightning protection effect,the maximum impact contact potential and step voltage of a building under 100kA lightning current are relatively high,the design optimization of lightning protection grounding structure of high voltage assembled substation buildings is presented.Adding a flasher in the prefabricated parapet of a substation building,and the vertical steel bar is arranged in the post-cast band of the precast wall body as the grounding lead,connect with the flasher,installation of ground plates on prefabricated wall door and window structures,based on the optimization of equivalent potential grounding device,the design optimization of lightning protection grounding structure of high voltage assembled substation building is realized.The example analysis results indicate that,after optimization,the maximum impact contact potential and step voltage of the building under 100kA lightning current are significantly reduced,and it meets the regulatory requirements and has good lightning protection effect.