一种双端测距算法的伪根问题与改进

双端故障测距由于不受过渡电阻和系统阻抗等因素的影响,得到了广泛的关注。但在利用长线方程沿线推导故障点电压幅值的测距算法中,原理上存在伪根的可能性,在某些情况下,会得到错误的测距结果,因此需要对该测距算法进行改进。该文首先对产生伪根的原因进行了深入地分析,并在此基础上,对原算法进行了改进,提出了判别伪根的原则,使其更具通用性,并利用EMTP程序仿真验证了改进后的测距算法。

False root and its improvement of a two-terminal fault location algorithm on transmission line

Recently, much attention is attached to two-terminal fault location algorithm, for this algorithm is not affected by fault resistance and system impedance. However, the two-terminal fault location algorithm, which deduces the voltage amplitude on line according to long-line equation, has the possibility of false root in theory. It will get wrong fault location results under some extreme conditions. Firstly, the paper deeply analyzes the reasons of false root of the two-terminal fault location algorithm. Secondly, based on the above detailed discussion, an improved fault location algorithm with false-root detection criterion is presented, which can be widely used. And at last, it is also validated by EMTP program with a simulation model.