不对称参数同塔四回线行波测距

Traveling wave fault location for four-parallel transmission lines on the same tower with asymmetric parameters

为实现不对称参数同塔四回线的行波测距,文章介绍了三种不同物理意义下的阻抗解耦矩阵M_(1)、M_(2)、M_(3)。对比分析解耦后的各模分量的相关特性,得出M_(3)具有天然的自选线功能,其解耦后的模2、模5、模8、模11与I、II、III、IV回线一一对应,能够将四回线下的行波测距转换为单回线下的行波测距,巧妙地解决了故障行波选取的难题。通过3次B样条小波包变换分析所选模量行波实现故障检测,依据双端行波测距原理完成测距。PSCAD/EMTDC实验仿真数据表明测距结果不受故障点位置和过渡电阻的影响,验证了行波模量选取的准确性与行波测距的可行性。

In order to realize the traveling wave fault location of the asymmetrical four-parallel transmission lines on the same tower,three impedance decoupling matrices M_(1),M_(2),and M_(3) in different physical meanings have been introduced in this paper.After comparing and analyzing the relative characteristics of each decoupled module component,the M_(3) has a natural optional line function and the modulo 2,modulo 5,modulo 8 and modulo 11 in the decoupling matrix M_(3) and the I,II,III,and IV lines are correspond one-to-one.Thereby,the traveling wave fault location of the four-parallel transmission lines can be converted into the single-loop line,which subtly solves the difficult problem of fault traveling wave selection.Through the 3 times B-spline wavelet packet transform analyzes the selected modulus traveling wave to achieve fault detection,and finally,the double-ended traveling wave ranging principle is adopted to complete the location.A large number of PSCAD/EMTDC experimental simulation data show that the ranging result is not affected by the location of the fault point and the transition resistance,which verifies the accuracy of the traveling wave modulus selection and the feasibility of traveling wave fault location.