针对使用PCM （多频管中电流法）对油气处理厂的埋地管道进行检测时，输入电流在三通处会受管道支管的影响而产生分流的问题，将检测的管道分支看成是并联电路，在输入电压不变的情况下，通过降低检测目标管段回路电阻的方法，控制埋地管道各支路PCM检测的输出电流信号强度，使检测电流信号更多地向待检测的管段分配，完成对油气处理厂埋地管道的定位。

While using the PCM (Pipeline Current Mapper) method to test the buried pipeline of the oil and gas treatment plant, the input current will be shunted due to the influence of the pipeline branch as there exist large numbers of branch pipelines. The pipeline branch can be regarded as a parallel circuit. Under the condition of the same input voltage, the output signal strength of every branch of the buried pipeline can be controlled by reducing the resistance of the target pipe loop, so that the detection current signal is more distributed to the pipe segment to be detected, and thus the positioning of the buried pipeline of the treatment plant can be completed.