雜散電流對(duì)管道斷電電位的影響

直流雜散電流的影響

??當(dāng)管道受直流雜散電流干擾時(shí)，不能用電源通斷的方式測(cè)量管道斷電電位。

直連犧牲陽極的影響

當(dāng)犧牲陽極與管道在地下直連時(shí)，不能用電源通斷的方式測(cè)量管道斷電電位。

交流極性排流器的影響

當(dāng)管道上安裝有交流電流極性排流器時(shí)，不能用電源通斷的方式測(cè)量管道斷電電位。極性排流器對(duì)交流電有整流作用，將產(chǎn)生半波整流的直流電流從接地極經(jīng)土壤流向管道，導(dǎo)致管地電位負(fù)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.