摘要
变电站作为第二类防电建筑物,要求严格的防雷等级。针对变电站装配式钢结构防雷技术要求,采用加拿大SES公司研发的接地分析软件CDEGS对变电站主控室装配式钢结构建筑防雷设计进行仿真。分析了直击雷接地、室内设备接地、二次等电位接地下的散流能力,获得满足安全要求的接地方式。研究结果表明:雷击屋顶时,工字钢立柱截面大而长度短,能有效疏散雷电流;建筑墙体檩条和集中垂直接地极散流能力较弱,依靠水平主接地网实现雷击流的散流作用。在建筑物直击接地、电器设备与主接地网相互独立状态下,通过人体能量为11.62 J、跨步电压为0.2 J,低于人体承受的能量安全值27 J,能够有效保证人身安全。建筑物直击接地、电器设备与主接地网连接状态下,通过人体能量达到30.21 J,超过了人体可承受安全值,将对人身安全造成严重影响。
As second class lightning protection buildings,substation requires strict lightning protection level.In accordance with the technical requirements of lightning protection of substation assembled steel structure,the lightning protection design of the assembled steel structure building of substation master control room was simulated by using the grounding analysis software CDEGS developed by SES company in Canada,the dispersive capacity of direct lightning grounding,indoor equipment grounding and secondary equipotential grounding was analyzed,by which the grounding method satisfying the safety requirements was obtained.The results of research showed that:when lightning struck the roof,the I-steel column of large section and short length could effectively disperse the lightning current,but the lightning current dispersion ability of the building wall purline and concentrated vertical grounding electrode was relatively weak,relying on horizontal main grounding network to realize the dissipation of lightning current.Under the condition that the building was directly grounded,the electrical equipment and the main grounding network were independent of each other,the energy passing through the human body was 11.62 J,and the step voltage was 0.2 J,lower than the safe value of 27 J that the human body could bear,which could effectively ensure personal safety.Under the condition of building direct grounding and the electrical equipment connected to the main grounding network,the energy passing through the human body reached 30.21 J,exceeding the safe value that the human body could bear,which would cause a serious impact on personal safety.
作者
方鹏
高亚栋
吴祖咸
何凯军
FANG Peng;GAO Yadong;WU Zuxian;HE Kaijun(Zhejiang Huayun Electric Power Engineering Design & Consultation Co. ,Ltd. ,Hangzhou 310014,China)
出处
《自动化仪表》
CAS
2020年第8期75-77,81,共4页
Process Automation Instrumentation
关键词
变电站
CDEGS
装配式钢结构
防雷装置
散流作用
接地电阻
安全电流
仿真设计
Substation
CDEGS
Assembled steel structure
Lightning protection device
Dispersive action
Ground resistance
Safe current
Simulation design
