杂散电流对管道断电电位的影响

杂散电流对管道断电电位的影响

直流杂散电流的影响

  当管道受直流杂散电流干扰时，不能用电源通断的方式测量管道断电电位。

直连牺牲阳极的影响

当牺牲阳极与管道在地下直连时，不能用电源通断的方式测量管道断电电位。

交流极性排流器的影响

当管道上安装有交流电流极性排流器时，不能用电源通断的方式测量管道断电电位。极性排流器对交流电有整流作用，将产生半波整流的直流电流从接地极经土壤流向管道，导致管地电位负向偏移。

Influence of stray current on pipeline outage potential

Influence of DC stray current

When the pipeline is disturbed by the DC stray current, the power-off potential of the pipeline cannot be measured by the way of power on and off.

Influence of directly connected sacrificial anode

When the sacrificial anode is directly connected with the pipeline underground, the power-off potential of the pipeline cannot be measured by the way of power on and off.

Influence of AC polarity drain

When the AC current polarity drain is installed on the pipeline, the power-off potential of the pipeline cannot be measured by the way of power on and off. The polarity drain rectifies the alternating current, and the half wave rectified direct current flows from the grounding electrode to the pipeline through the soil, resulting in the negative deviation of the pipe ground potential.