电缆-架空线混合线路故障行波定位及自适应重合闸控制

提出一种基于预值查表故障搜索算法的混合线路双端行波故障定位方法．基于各个电缆一架空线连接点产生的行波到达线路两端的时间差建立故障区段预置表，利用故障时初始行波波头到达线路两端的时间差查表搜索故障区段，根据故障区段进行重合闸控制，如果故障在电缆上则闭锁重合闸，反之，则开放重合闸；并根据双端行波定位公式计算出故障点位置．EMTP仿真结果表明，提出的行波定位方法可准确定位故障点位置，误差小于50m，且不受故障点位置、故障类型及过渡电阻的影响，可精确实现重合闸，具有较强的实用性．

New method of traveling wave fault location and adaptive reclosing for cable-overhead mixed lines

Double-end traveling wave based fault location scheme with preset value lookup table searching is proposed for mixed lines in this paper. Traveling wave transmission time differences from the node of each cable and overhead line to the line double-end are applied to set＇ the table. When fault occurs, the time difference of faults point generated traveling wave arriving at both ends of the line is compared with the table, and the faulted section is located. If the fault happens on the cable, the reclosing will be prohibited, on the contrary, the reclosing will be permitted. The fault is also located by the double-end traveling wave location formula computing. The EMTP simulation results show that the fault point is located accurately by the proposed location scheme, the error is less than 50m. This technique is practical and not affected by the fault point location, fault type and fault resistance, and the reclosing can be realized exactly.