【摘要】 超高压输电线路架线位置高、架设回数多及输送距离远，其运行中容易受到雷电袭扰，从而威胁系统稳定性和可靠性，不同雷击类型会对线路不同部位产生损伤。针对雷击类型的准确识别问题，提出一种超高压线路雷击类型识别方法。以500 kV同塔双回路鼓型杆塔为例，在ATP-EMTP平台中建立了考虑多因素的仿真模型，分析不同故障工况下雷电绕击、反击的特征，以雷击线路后故障信号通过杆塔入地的暂态信号作为研究对象，提出一种基于改进希尔伯特黄变换的雷击类型识别方法，利用故障信号的固有模态函数（IMF）在方差贡献率的不同分布趋势构造判据。通过不同参数验证分布规律的稳定性，发现分布趋势基本不受雷电流幅值大小及接地电阻的影响，且具有稳定清晰的界限，可准确识别雷电故障类型。对及时发现线路绝缘薄弱点以及制定更有针对性的防雷措施都具有十分重要的意义。更多还原

【Abstract】 Extra high voltage transmission lines have such characteristics as high erection position,multiple erection circuits and long distance transmission,making them susceptible to lightning strikes during operation,thus posing a threat to the stability and reliability of power system. As for the accurate identification of lightning strike type,a kind of lightning strike type identification method of extra high voltage line is proposed. A 500 kV double circuit drum shaped tower is taken as an example,a simulation model considering multiple factors is set up in the ATP-EMTP platform to analyze the characteristics of lightning shielding and lightning back-striking under different fault conditions. A method based on improved Hilbert-Huang transform is proposed to study the fault transient signal passing through the tower after lightning strike. The criteria is constructed by the different distribution trend of intrinsic mode function(IMF)of the fault signal under variant contribution rate. It is found by verifying the stability of the distribution through different parameters that the distribution trend is basically not affected by the magnitude of lightning current and ground resistance,and has stable and clear boundaries,which can accurately identify the type of lightning fault. It is of great significance to promptly identify weak insulation point of line and develop more specific lightning protectionmeasures.更多还原