一种不受波速影响的单端行波测距方法

一种不受波速影响的单端行波测距方法
位韶康;陈平;姜映辉
【期刊名称】《电力系统保护与控制》
【年(卷),期】2013(000)013
【摘要】分析了架空线路发生故障后行波的传播过程以及行波折、反射原理。

针
对双端测距的不足提出了一种基于分析单端行波前三个波头的故障测距新方法。

首先，在线路两端安装实时通信装置，根据两端的第一个波头的到达时间先后识别故障点离两端母线哪一端更近，然后利用单端行波测距方法记录M端母线接收到的
前三个波头到达的绝对时间，确定故障点类型，经过数学变形消去会对测距结果产生误差的主要影响因素行波传播速度v,求出故障点位置。

所提方法避开了单端行
波测距中区分第二个波头性质的难题，消除了双端原理测距中线路两侧准确时间同步问题对测距精度的影响，消除了会对测距结果产生误差的主要影响因素波速v ，进而提高了故障定位准确性。

ATP-EMTP 仿真验证表明，所提出的不受波速影响
的单端行波测距方法是可行的，故障定位精确度更高。

%The propagation and the principle of refraction and reflection of traveling waves after fault at overhead lines are analyzed. In respect to the lack of double-ended ranging, this paper proposes a new fault location method based on the analysis of the first three waves’ head of the single-ended traveling wave. First, the real-time communication device is installed at both ends of the line, according to the arrival time of the first wave’s head to determine which end of the bus the fault point approaches to. Then the absolute time of the first three waves’ head arrival received by M-end bus is recorded
by using single-ended traveling wave ranging method and the types of fault point are determined. Mathematical deformation is used to eliminate wave velocity v which will produce errors to fault location results and fault point location is obtained. The method proposed avoids the problem of distinguishing the nature of the second wave head in single-ended traveling wave ranging, eliminates the influence of accurate time synchronization at both sides of line on ranging accuracy of double-ended ranging principle, and eliminates the wave velocity v, thus improving the accuracy of fault location. ATP-EMTP simulation results show that the proposed method is feasible, and its fault location accuracy is higher.
【总页数】6页(P76-81)
【作者】位韶康;陈平;姜映辉
【作者单位】山东理工大学电气与电子工程学院，山东淄博255049;山东理工大学电气与电子工程学院，山东淄博255049;山东理工大学电气与电子工程学院，山东淄博255049
【正文语种】中文
【中图分类】TM77
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