基于时间线性拟合的地缆架空混合线路的行波故障定位

目的 研究n段地缆架空混合输电线路中行波故障定位问题，提出一种基于时间线性拟合的行波故障定位方法。方法 首先对故障区域进行判断，确定故障所在的区域，其次再将不同波阻抗线路进行归一化处理，减少因波速不同而产生的测距误差，最后使用时间线性拟合的方法对故障进行精确定位。结果 解决了初始行波波头识别困难的问题，也减小了行波速度随传输距离变化而变化带来的测距误差问题。结论 在MATLAB/Simulink中搭建一个500 kV的地缆架空混合输电线路仿真模型，实验的验证结果表明此故障定位方法能够有效地解决因行波速度不同而导致的双端行波测距方法不适用问题，最终实现对故障点的精确定位。

Traveling Wave Fault Location of Mixed Lines of Ground and Overhead Cables Based on Time Linear Fitting

Objective This paper investigated the traveling wave fault location in n-section ground-overhead mixed transmission lines and proposed a traveling wave fault location method based on time linear fitting. Methods Firstly the fault area was determined to identify the region where the fault occurred. Next different wave impedance lines were normalized to reduce ranging errors caused by different wave speeds. Finally the time linear fitting method was used to accurately locate the fault. Results This method addressed the difficulty in identifying the initial traveling wave head and reduced ranging errors caused by changes in traveling wave speed with transmission distance. Conclusion A simulation model of a 500 kV ground-overhead mixed transmission line was built in MATLAB / Simulink. The experimental validation results demonstrate that this fault location method can effectively overcome the inapplicability of the dual-end traveling wave ranging method due to different wave speeds and ultimately achieve precise fault location.