距离实际故障点（即，出现错误的位置）越近，执行此干预就越有效和越可行。
This intervention is the more effective and practicable the closer it is performed to the actual point of failure (that is, where the fault has been raised).
寻找合适的数学工具从可测电气量中提取直接反映故障距离信息是重要的突破点。
It is a breakthrough to extract key information, which directly reflect fault distance from fathomable electrical measurements with appropriate mathematics tool.
直流输电线路距离往往上千公里，线路越长、发生故障的概率越高，同时查找故障点的难度也越大。
The longer the lines are, the greater probability of line fault is, and the more difficult it will be to find the fault location.
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