特高压直流入地电流对埋地钢管阴极保护的干扰影响  

Interference Effects of Ultra-High Votage Direct Current Grounding Current on Cathodic Protection of Buried Steel Pipeline

作　　者：钟雪 张文艳 但涛 ZHONG Xue;ZHANG Wenyan;DAN Tao(Gathering and Transportation Engineering Technology Research Institute,Southwest Oil and Gas Field Company,Chengdu 610000,China;Sichuan Gas Field,Southwest Oil and Gas Field Company,Luzhou 646000,China)

机构地区：[1]西南油气田分公司集输工程技术研究所,成都610000 [2]西南油气田分公司蜀南气矿,泸州646000

出　　处：《腐蚀与防护》2022年第11期74-77,94,共5页Corrosion & Protection

摘　　要：选取了川渝地区某管道和共乐特高压直流接地极为研究对象,采用阴极保护测试技术连续监测接地极放电过程中管道阴极保护参数,分析了特高压直流入地电流对管道的干扰范围及影响程度。结果表明:当该接地极以2900 A阴极放电时,管道全线共有11处极化电位超标;管道电位最负为-3347 mV,最正为+189 mV,管道电位正向偏移量超过100 mV的管道长度约28 km,特高压直流接地极放电影响范围较广;接地极放电过程中,恒电位仪、锌带等腐蚀防护措施对缓解和抑制杂散电流干扰起到了积极作用,但部分管段破损点位置依旧存在腐蚀风险。最后,结合管道阴极保护情况及测试结果提出了相应的建议。A pipeline and Gongle grounding electrode of ultra-high voltage direct current(UHVDC)in Sichuan-Chongqing area were selected as research objects.The cathodic protection parameters of the pipeline during discharge of the grounding electrode were continuously monitored by cathodic protection test technology.The interference range and influence degree of UHVDC grounding current on the pipeline were analyzed.The results showed that the polarization potentials exceeded the standard in 11 places throughout the pipeline during cathode discharge of the grounding electrode with 2900 A.The most negative pipeline potential was-3347 mV,and the most positive pipeline potential was+189 mV.The pipeline with a positive potential offset more than 100 mV was about 28 km in length,and the UHVDC grounding electrode discharge had a wide range of influence.Corrosion protection measures such as potentiostat and zinc strip played positive roles in alleviating and restraining stray current interference in the discharge process of the grounding electrode,but there were still corrosion risks at the damaged points in some pipe segments.Finally,the corresponding suggestions were proposed according to the situation of pipeline cathodic protection and test results.

关 键 词：特高压直流 接地极 腐蚀 阴极保护 干扰影响 

分 类 号：TG174[金属学及工艺—金属表面处理]