T型线路的行波测距原理与算法

Fault location algorithm based on wavelet transform for T-connection transmission lines

针对已有的T型线路行波故障测距算法测距结果易受行波波速影响的不足,提出一种新的T型线路行波故障测距算法。该算法根据相同条件下行波波速相等的原理,在已知线路长度和故障电流初始行波到达线路三端的时间的情况下,无需行波波速精确值参与判断和计算,排除了其对故障支路判断和部分情况下测距精度的影响,且在T节点附近不存在死区。通过大量Matlab仿真表明,该算法计算简单,测距精度较高,能够满足故障定位的要求。

In respect to the defect that the location result of the present travelling wave fault location algorithm for T-connection transmission line is easily affected by travelling wave velocity, this paper proposes a new method for the fault location on T-connection transmission lines, which is based on the principle that the traveling wave velocity is equal on the same condition. Only line parameters and the arriving time of initial fault current transient traveling waves to line three-side are needed in the method, where there is not a dead zone when fault occurs nearby the T-connection node, and the influence of the wave velocity on fault branch judgement and location accuracy on part condition is also excluded. The results of simulation show that the proposed method has simple computation, higher accuracy and can meet the requirement of fault location.