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中文摘要：
为给迅速查找故障点、缩短故障排除时间提供必要的保证,突破了将故障点作为未知条件看待的传统T型线路故障测距思维,提出了一种利用匹配思想的T型线路故障测距新算法。该方法在将故障位置作为已知条件看待并引入参考点与之匹配的思想基础上,构建了一个新的测距函数。根据故障支路上所取参考点与故障点相匹配时测距函数幅值达到最小这一特征进行定位。该方法打破了传统先判断故障支路再故障定位的模式,无需事先判别故障支路即可测距。该方法无测距死区,较好地克服了传统方法在T节点附近有测距死区的不足,且不存在伪根,对非线性电阻故障具有良好的适用性,所需运算量小,能有效克服传统方法存在的测距精度和测距速度此消彼长的矛盾。EMTDC仿真验证了该方法的正确性和有效性。
英文摘要：
A new fault location function was generated based on the matching idea of selecting a reference point to match the fault position. It is concluded that, the function has different phase characteristics between the fault branch and the healthy branches, and there is minimum amplitude of the function when the reference point matches the fault position on the fault section. Based on the phase and amplitude characteristics of the function, an accurate fault location method for three-terminal transmission lines is proposed. The method perfectly solves the disadvantages of the currently-used methods that there is a dead zone of fault location near the teed node. The method has less calculation burden than the traditional methods have, and can effectively overcome the contradiction between fault location precision and fault location speed which lies in the traditional methods, The solution of the function is unique. Therefore, the presented method has no false root in theory. Results of EMTDC based simulation indicate that the proposed method is correct and accurate.
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