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电网技术  2015 

特高压直流输电线路雷击暂态过程与行波保护响应特性分析

DOI: 10.13335/j.1000-3673.pst.2015.10.022, PP. 2830-2835

Keywords: 特高压直流系统,雷击暂态过程,行波保护,响应特征

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Abstract:

针对实际工程中特高压直流输电线路雷击事件,采用电磁暂态仿真软件PSCAD/EMTDC实现雷击特高压线路的小步长仿真,解决了目前仿真方法未能与保护分析工作相适应的问题。主要分析了发生非故障性绕击、故障性绕击以及反击时保护安装处电压、电流的暂态过程,描述各电气暂态量在雷击极与非雷击极的主要特征及区别。结合实际行波保护模型的动作情况,对比非故障性绕击、故障性绕击以及反击下dU/dt判据、ΔU判据、ΔI判据在雷击极与非雷击极的响应结果,梳理雷击特高压直流输电线路行波保护判据的响应特性,指出在故障性绕击、反击场景下非雷击极行波保护误动情况是由于线路耦合导致在雷电流波头上升阶段出现非雷击极保护的ΔU、ΔI判据满足整定值造成的。最后给出了提高特高压直流系统行波保护雷击可靠性的优化思路。

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