330 kV架空线-电缆混联线路的雷电过电压研究

Research on Lightning Overvoltage of 330 kV Overhead Line-Cable Hybrid Lines

中文关键词:架空线  电缆  雷电过电压  电磁暂态仿真

keywords:overhead line  cable  lightning overvoltage  electromagnetic transient simulation

中文摘要:围绕330 kV架空线-电缆混联系统，基于专业电磁暂态计算平台搭建了涵盖线缆拓扑、塔架阻抗、雷击波形与避雷器特性的系统级过电压仿真环境，分析了雷电作用下过电压沿系统的分布特性及其影响因素。计算结果表明：雷击条件下架空线路段承受的过电压水平显著高于电缆段，最大幅值可达3.3 MV；随着雷击点远离电缆接入位置，电缆两端过电压整体呈衰减趋势，且末端电压高于首端电压；合理布置电缆两侧避雷器可有效限制过电压幅值，使其满足绝缘耐受要求。研究成果可为330 kV混联输电线路的防雷设计与绝缘配置提供技术依据。

Abstract:Focusing on the 330 kV overhead line-cable hybrid system， a complete lightning overvoltage simulation model is established based on a professional electromagnetic transient calculation platform， which uniformly describes key components such as transmission lines， towers， lightning current and surge arresters. The distribution characteristics of overvoltage along the system under lightning strokes and its influencing factors are analyzed. Simulation results demonstrate that the transient overvoltages triggered by lightning strikes on the overhead segments far exceed those of the cable section, with a peak value of 3.3 MV. As the lightning strike point moves away from the cable connection position， the overvoltage at both ends of the cable generally shows an attenuation trend；meanwhile，the voltage magnitude at the far end surpasses the initial end. By properly deploying surge protective devices at both cable extremities，transient voltage peaks can be constrained to satisfy the necessary insulation requirements. The research results can provide a technical basis for lightning protection design and insulation configuration of 330 kV hybrid transmission lines.