影響管地電位的所有電源要同步通斷

測(cè)量管道斷電電位時(shí)，所有影響該點(diǎn)管地電位的電源都要同步通斷，尤其是那些輸出電流比較大、影響范圍比較廣的恒電位儀通常的做法是將與GPS同步的電流通斷器串聯(lián)在陰極保護(hù)電源陰極或陽(yáng)極回路中，在斷電瞬間，尤其在靠近陰極保護(hù)站位置，管地電位有時(shí)會(huì)有一個(gè)正向脈沖。為避免管地電位脈沖對(duì)斷電電位測(cè)量值的影響，斷電電位應(yīng)在斷電后0.3~0.5s內(nèi)讀取，若用萬(wàn)用表讀取管道斷電電位，則很難發(fā)現(xiàn)該脈沖。

?

All power supplies affecting the pipe ground potential shall be switched on and off synchronously

When measuring the pipeline power-off potential, all power supplies that affect the pipeline ground potential at this point shall be switched on and off synchronously, especially those potentiostats with large output current and wide influence range. The common practice is to connect the current switch synchronized with GPS in the cathode or anode circuit of the cathodic protection power supply. At the moment of power-off, especially near the cathodic protection station, the pipeline ground potential sometimes has a positive pulse. In order to avoid the impact of the pipeline ground potential pulse on the measured value of the power-off potential, the power-off potential should be read within 0.3 ~ 0.5s after the power-off. If the pipeline power-off potential is read with a multimeter, it is difficult to find the pulse.