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中文摘要：
为解决铁路自闭贯通线架空线-电缆混合线路波速度不一致难以精确测距的问题，在分析混合线路连接点处行波传播特点的基础上，提出了基于时间差搜索的双端行波测距方法．利用连接点处行波到达线路两端时间差的不同来确定故障发生在线路中的区段和相应的波速度，再进行精确测距．基于PSCAD／EMTDC对自闭贯通线混合线路建模，并利用小波变换及模极大值检测理论提取行波波头进行分析．仿真结果表明，该方法对于架空线-电缆的混合线路是可行的．
英文摘要：
In railway automatic blocking and continuous transmission lines （RABCTL）, accurate fault location of overhead lines combined with cable is hampered by different wave speed. A double-ended method of travelling wave fault location based on time-difference-search was developed after analyzing travelling wave transmission at hybrid line joints. The method determined fault zone and wave speed by different time when travelling wave reached line ends, and then got accurate fault distance. A power system computer aid design （PSCAD）/electro-magnetic transient in DC system （EMTDC） model of hybrid line in RABCTL was given, and travelling wave heads were picked up and analyzed by wavelet transform and modulus maximum method. Simulation result shows that the proposed method is feasible.
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