两种T型线路故障测距算法的性能对比与仿真验证

Performance comparison and simulation verification of two T-type line fault location algorithms

根据纵向阻抗在双端线路中呈现的线性特点,延伸到T型线路中,在已确定的故障分支上,提出两种T型线路故障定位的算法。间接法,结合T型线路结构,利用线路传输方程将非故障支路的电气量转移至T节点,构建使用纵向阻抗的线路条件,基于纵向阻抗与故障距离的线性关系,确立精确的故障位置。直接法,在间接法的基础上,保持两端电压差不变,辅以另外一端的电流,构成三端的电流和,建立适用于T型线路的纵向阻抗算法。在相同的仿真环境下,进行了对比性的验证,结果表明,两种算法都能够得到有效的故障位置,在随故障距离、故障类型和运行方式等因素的影响下,两种算法都有很好的精度。

According to the characteristics of the longitudinal impedance presented in the double-ended line,it is extended into the T-type line.On the identified fault branch,two T-line fault location algorithms are proposed.The indirect method,combined with the T-type line structure,uses the line transmission equation to transfer the electrical quantity of the non-faulty branch to the T-node and constructs the line condition using the longitudinal impedance.The accurate fault location is established with the linear relationship between the longitudinal impedance and the fault distance.The direct method,based on the original double-ended longitudinal impedance,keeps the voltage difference between the two ends constant,supplemented by the current at the other end,and forms the current of the three ends,establishing a longitudinal impedance algorithm suitable for the T-type line.In the same simulation environment,the comparative verification is carried out.The results show that both algorithms can obtain effective fault location.Under the influence of factors such as fault distance,fault type and operation mode,both algorithms are very good precision.