高压直流接地极对油气输送管道的危害辨识

Hazard Identification of HVDC Grounding Pole to Oil & Gas Pipeline

油气输送管道作为社会发展的能源动脉,确保其安全运行,具有重要的意义。结合高压直流接地极放电实测数据,对高压直流接地极放电给油气输送管道带来的危害进行系统辨识,影响危害的两个主要因素为管道受到的电干扰的程度以及管道系统的耐受能力,其危害可归纳为管体损伤、防腐层剥离、排流器烧蚀和接地材料消耗过快、阀室工艺设备烧蚀、防雷器烧蚀、绝缘接头击穿和内壁腐蚀、阴极保护设备烧蚀、变压器直流偏磁及人员触电。建议采用耐受性能好的设备设施,从源头控制高压直流接地极放电干扰强度,对高压直流接地极带来的风险进行评价并采取与干扰程度相适应的防护措施,确保管道安全运行。

Oil and gas transportation pipeline is the energy artery of social development and it is of momentous significance to ensure the pipeline operates safely. Based on the measured data of HVDC grounding electrode discharge, this paper systematically identifies the hazard brought by HVDC grounding electrode discharge to oil and gas transportation pipeline. The two main factors that affect the hazard include the degree of electrical interference suffered by pipelines and the tolerance of pipeline system. The hazard can be summarized as pipe damage, corrosion protection layer stripping, drain ablation and excessive consumption of grounding materials, valve chamber process equipment ablation, lightning protection ablation, insulation joint breakdown and inner wall corrosion, cathodic protection equipment ablation, transformer dc magnetic bias and electric shock. It is suggested to adopt equipment and facilities with good tolerance, and control the interference intensity of HVDC grounding electrode discharge from the source, evaluate the risk caused by HVDC grounding and take protective measures corresponding to the interference degree to ensure the pipeline operates safely.