高压直流接地极对埋地管道的干扰监测及影响规律

为了掌握高压直流输电工程接地极对埋地管道杂散电流干扰的影响规律,在17个高压直流输电工程接地极附近的12条管道上安装了电位远程监测系统,对管道电位进行长时间连续监测。通过管道电位变化分析接地极的干扰频次和干扰时间,以及管道受干扰程度、影响范围。监测结果显示:通过对管道电位长时间连续监测能够准确判断出接地极对管道的干扰影响,2017年17个接地极的总干扰频次为201次,干扰总时长为657.31 h,较2016年略有下降;监测到1987 km管道受到接地极的干扰,其中华南地区接地极对管道的干扰较华东、华中及西北地区大。干扰电位分布规律分析结果表明,接地极与管道的垂直距离越短,靠近接地极端杂散电流流入流出的管段越短,其对远离接地极端的管道的干扰程度越大、干扰范围越广。

Interference monitoring and influence rule of HVDC grounding electrode to buried pipelines

In order to understand the influence rule of the grounding electrode of HVDC transmission engineering on the stray current of buried pipeline,the remote potential monitoring system was equipped for 12 pipelines near the 17 grounding electrodes of HVDC transmission engineering for continuous monitoring of pipeline potential in long time.The interference frequency and time of grounding electrodes,as well as the interference degree and range of pipeline,were analyzed based on the variation of pipeline potential.According to the monitoring results,the interference influence of grounding electrode to pipeline can be judged accurately through the long-time continuous monitoring of pipeline potential.In 2017,the interference frequency of 17 grounding electrodes was 201 times,and the total interference time was 657.31 h,which was slightly shorter than that in 2016.Interference of grounding electrode was monitored on 1987 km pipelines,and particularly,the interference of grounding electrode to pipeline in South China was greater than that in East China,Central China and Northwest China.By analysis on the distribution rule of interference potential,it is found that the shorter the vertical distance from grounding electrode to pipeline,the shorter the pipeline section with stray current flowing in the end close to the grounding electrode,the greater the interference to the pipeline far away from the grounding electrode,and the larger the interference range is.