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随着我国对能源需求的快速增长以及土地资源的日益紧张,直流输电工程与油气管道相邻不断增多,直流输电工程对埋地金属管道的电磁影响问题日益突出。针对管道上的防腐和保护措施,通过分析这些措施对管道作用的机理,建立了管道防腐层、局部接地装置、绝缘接头、牺牲阳极和强制阴极排流装置的电路模型,并通过矩量法和电路相结合,建立了考虑管道各种措施的直流接地极对埋地金属管道影响的电路模型和计算方法,通过计算结果与CDEGS计算结果及工程实测结果的对比,验证所建模型和相应算法的正确性。通过仿真计算,初步分析几种管道保护措施对管道管地电位的影响。管道上不同的措施对管道的影响不同,就减弱直流输电工程对管道的影响而言,强制阴极排流装置的主要作用是减弱管道的腐蚀,对降低管道的管地电位效果有限。
With the rapid growth of energy demand in our country and the increasing shortage of land resources, there is an increasing number of adjacent DC transmission projects and oil and gas pipelines. The impact of HVDC transmission projects on the electromagnetic effects of buried metal pipelines has become increasingly prominent. Aiming at the anticorrosive and protective measures on pipeline, the circuit model of pipeline anticorrosive coating, local grounding device, insulated joint, sacrificial anode and forced cathode drain device is established by analyzing the mechanism of these measures on the pipeline. Circuit, a circuit model and a calculation method of the effect of DC grounding electrode on the buried metal pipe considering various measures of the pipeline are established. By comparing the calculated result with the CDEGS calculation result and the actual measured result, the model and the corresponding algorithm Correctness Through the simulation calculation, preliminary analysis of several pipeline protection measures on the pipeline pipe ground potential. Different measures on the pipeline have different impacts on the pipeline. To weaken the impact of the HVDC transmission project on the pipeline, the main function of the forced cathode drainage device is to weaken the corrosion of the pipeline and to reduce the pipe-to-ground potential of the pipeline.