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发明授权
CN108445354B 基于行波差电流的故障测距方法、装置、设备及介质 有权 转让

基于行波差电流的故障测距方法、装置、设备及介质
摘要：
本发明公开了一种基于行波差电流的故障测距方法，包括：获取直流线路起始端J的1模电压uJ1和1模电流iJ1及直流线路末端K的1模电压uk1和1模电流iK1；获取1模波阻抗Zc1及1模传播延时τ1；得到1模正向的行波差电流和1模反向的行波差电流以所述1模正向的行波差电流和所述1模反向的行波差电流中的正向或反向的行波差电流作为参考标准，则对另一方向的行波差电流在时间轴上进行平移，以获取所述1模正向行波差电流和所述1模反向行波差电流的Pearson相关系数最大值时的所述时间差Δt；其中，Δt∈(‑τ1,τ1)；其中，所述‑τ1为故障发生在所述起始端J时的传播延时；其中，所述τ1为故障发生在所述末端K时的传播延时；根据所述时间差Δt计算故障位置。能简便可靠判断故障发生的位置，不受故障类型影响，并且具有较强的抗过渡电阻能力。
摘要（英）：

The invention discloses a fault location method based on traveling wave difference current. The method comprises steps: one-mode voltage uJ1 and one-mode current iJ1 of a DC line starting end J and one-mode voltage uK1 and one-mode current iK1 of a DC line tail end K are acquired; 1-mode wave impedance Zc1 and 1-mode propagation delay tau1 are acquired; one-mode forward traveling wave difference current di<1><+>(t) and one-mode backward traveling wave difference current di<1><->(t) are obtained; forward or backward traveling wave difference current in the one-mode forward traveling wave difference current di<1><+>(t) and the one-mode backward traveling wave difference current di<1><->(t) is used as a reference standard, the traveling wave difference current in the other direction is translated, and the time difference deltat when a Pearson correlation coefficients are maximum of the one-mode forward traveling wave difference current di<1><+>(t) and the one-mode backward traveling wavedifference current di<1><->(t) is acquired, wherein deltat belongs to a range of -tau1 to tau1, the -tau1 is the propagation delay when the fault happens at the starting end J, and the tau1 is the propagation delay when the fault happens at the tail end K; and a fault location is calculated according to the time difference deltat. Thus, the fault location can be reliably judged, which is not influenced by a fault type, and the anti-transition resistance ability is strong.

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