基于分段补偿原理的电缆架空线混合线路双端行波故障测距算法

A Sectionalized Compensation Based Two-Terminal Traveling Wave Fault Location Algorithm for Hybrid Transmission Line Composed of Power Cable and Overhead Line

架空线、电缆多段混合线路中,由于各段线路行波速度不一致,用于均匀传输线的传统双端测距算法无法适用。给出了传统双端测距算法的另一种表达形式,在分析混合线路行波传播时间特征的基础上,提出比较故障初始行波浪涌到达线路两侧测量点的时间差与混合线路各个连接点处行波传播到线路两侧测量点的时间差确定故障区段,再通过时间和距离补偿,将故障距离表示为故障区段端点到测量点的距离与故障点到该端点的矢量距离之和。相比于现有混合线路行波测距方法,所提方法适应性更强、概念更清晰、实现更简单,且实现了和传统双端测距算法的形式与物理含义的统一。ATP仿真验证了该方法的可行性。

In transmission lines composed of multi sections of overhead lines and power cables, due to the difference between traveling wave velocities in power cable and overhead line traditional two-terminal fault location algorithm for uniform transmission line is not suitable. Another kind of expression form of traditional two-terminal fault location algorithm is given, and on the basis of analyzing the characteristics of travel time of traveling wave in hybrid line, it is proposed to determine the faulty section by comparing the time difference of the surge of initial fault traveling wave arriving measuring points located at both terminals of the line with the time differences of traveling waves at all junction points arriving to measuring points located at both terminals of the line, and through the compensation of time and distance the fault distance is expressed as the sum of the distance from the endpoint of faulty section to measuring point and the vector distance from fault point to this terminal. Comparing with existing traveling wave fault location methods for hybrid lines, the concept of the proposed method is clearer, and it possesses stronger adaptability and is simple to implement. The feasibility of the proposed method is validated by ATP-based simulation.