基于零模行波波速量化的高压输电线路双端故障定位方法

结合行波零模分量传播的依频特性和衰减特性，提出基于零模行波波速量化的高压输电线路双端故障定位方法。利用最小二乘法拟合零模行波波速与故障零模行波到达首末端的传输时间差之间的关系。基于故障发生后实际测量行波信号的传输时间差，获取对应首末端的零模行波实际波速代入改进的双端行波测距方程实现故障定位。在PSCAD/EMTDC中搭建500 kV高压输电线路依频特性模型对所提方法进行仿真验证，结果表明该方法基本不受故障位置和故障电阻的影响，具有较高的故障定位精度。

Two-terminal fault location method for high-voltage transmission line based on zero-mode traveling wave velocity quantization

Combining with the frequency-dependent characteristics and attenuation characteristics of the zero-mode component of the traveling wave, a two-terminal fault location method for high-voltage transmission line based on zero-mode traveling wave velocity quantization is proposed. The least squares method is used to fit the relationship between the zero-mode traveling wave velocity and the difference between the propagation time of faulty zero-mode traveling wave to reach the sending and receiving terminals. Based on the actual measurement of the transmission time difference of the traveling wave signal after the fault occurs, the actual wave velocity of the zero-mode traveling wave corresponding to the sending and receiving terminals is obtained, and it is substituted into the improved two-terminal traveling wave ranging equation to realize the fault location. A 500 kV high-voltage transmission line frequency-dependent characteristic model is built in PSCAD/EMTDC to verify the proposed method. The simulative results show that the proposed method is basically not affected by the fault location and fault resistance, and has high accuracy and reliability of fault location.