介绍了单相接地故障行波选线原理，故障线路电流初始行波幅值最大，极性与非故障线路相反。
Its principle is presented: the amplitude of initial traveling wave on faulty feeder is higher than those on other feeders and its polarity is in inverse.
Initial value与Increment字段(如图3所示)可以设置初始行与每一个随后行的值。
The initial value and Increment fields (as shown in Figure 3) can set the value of the initial row and each subsequent row.
从子程序的debug_line部分获取lowpc和highpc，计算它的初始行号和结束行号。
Get lowpc and highpc from the debug_line section of this subprogram to calculate the its start and end line Numbers.
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