为了解决福建液化天然气(LNG)管道ZZ002测试桩附近杂散电流干扰问题, 联合使用长时间电位监测手段、密间隔电位测试(CIPS)检测方法、土壤电位梯度(DCVG)检测等方法确定了管道电位异常的时间、范围和沿管道的分布状况, 发现了杂散电流的源头; 切断杂散电流干扰源后, 对管道进行复测, 管道电位恢复正常; 并对干扰现象产生的原理进行了分析、计算, 和实际测量结果进行核对, 证实联合使用时间电位监测手段、CIPS检测方法、土壤电位梯度检测等方法可以有效查找杂散电流干扰源。

In order to solve the stray current interference problem near the Fujian LNG pipeline ZZ002 test pile, the stray current source was found by combined several methods, including CIPS, DCVG and potential detection. The interference was eliminated by turning off the stray current source and then the negative shift of potential disappeared. The strength of the interference was analyzed and computed. The contrast was completed between the computed data and the field data. It is confirmed that the combination of time potential monitoring means, CIPS, DCVG and potential detection can effectively find the stray current interference sources.