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.
对在高处工作中所使用的电器设备，除应作维护接零外，还有必要在设备负荷的首端处设置漏电维护设备。
2 on electrical equipment used in the above work, in addition to maintenance should be zero, and necessary in the first set at the end of the equipment load leakage protection equipment.
应用推荐