首端是汉语词语，拼音是shǒu duān，意思是开端；开始。
分析表明，线路末端三相故障时，线路首端的测量阻抗不与故障距离成正比。
The analysis shows that the measured impedance at the head of the line is not proportional to the fault distance when a three-phase fault occurs at the end of the line.
故障发生后，对于不同的故障性质，线路首端重合闸安装处的电压谐波含量是不同的。
After faults occur, different kinds of faults have different percentages of voltage harmonic signals which can be measured on busbar.
然后在线路首端注入电流，通过探测器检验几个分支上是否有电流流过，检测到电流的即为故障点所在的分支。
After injecting current into the head of line, the detector can check whether these branches flow current, the fault branch is that the current has flowed.
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