10 kV自闭/贯通线是铁路供电系统重要组成部分,其故障定位宜采用行波测距法.在供电线路中,架空线和电缆多次交替使用而引起的波速不同与截面处反射是制约测量精度的关键因素.为解决不同线路混用带来的系列问题,提出基于等值线路的速度归一化方法.该方法首先给出了等值长度的概念,然后在线路模型的基础上通过等值变换实现了波速的统一.大量的仿真实验验证,该方法不仅概念清楚,而且定位精度达到设计要求.%The 10kV automatic blocking and continuous power transmission line is an important part of railway power supply system,and the electromagnetic transient traveling wave method is suitable for its fault location.The different traveling wave speed and the wave reflection are caused by the frequent alternate use between overhead lines and cables,which is the key factor that restricts the measurement precision in transmission line.In order to solve the problems caused by the alternate application of different lines,a new method of normalized velocity is proposed by the equivalent transform of transmission line circuit.The concept of equivalent length is first defined in the method,and then the uniform wave velocity is obtained by the equivalent transformation on the basis of the line model.A large number of simulation experiments show that the proposed method not only has a clear concept,but also its localization accuracy meets the design requirements.
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