Determining and protecting method for influence of extra-high voltage AC pipeline on petroleum and nature gas pipeline

Abstract

The invention relates to a determination and protection method for influence of super-high voltage alternating current line on an oil and gas pipeline. The method comprises the following steps: firstly, building an equivalent circuit model of a multi-conductor transmission system consisting of a super-high voltage alternating current transmission line and a buried metal pipeline; calculating and adding the interferences of the transmission line on the pipeline through inductive coupling in a normal state and a short circuit state to get a total interference; calculating and analyzing factors leading to the fact that the transmission line influences the degree of the electromagnetic interference of the transmission line on the metal pipeline under different conditions, and calculating and analyzing the influence of an alternating current on corrosion of the metal pipeline; meanwhile, carrying out simulation experiments of inductive coupling and resistive coupling respectively; and summarizing the analysis of the influence factors and putting forward effective protection measures. Comparison of experimental data obtained in the experiments shows that the method has high accuracy. So the method can be used for accurate calculation of electromagnetic protective distance, parallel length and crossing angle of high voltage transmission lines and buried metal pipelines as well as for research on corrosion and protection of buried metal pipelines.

Description

technical field [0001] The invention belongs to the field of electromagnetic compatibility of high-voltage power transmission and transformation projects, and specifically relates to a method for determining and protecting the influence of 1000kV ultra-high voltage AC lines on oil and gas pipelines. Background technique [0002] In order to meet the electricity demand for the sustainable development of my country's economy and society, the construction of a strengthened power grid with UHV power grid as the core has become a strategic goal of national power construction. When long-distance and large-capacity transmission is adopted, UHV transmission can effectively save line corridors, help improve network structure, reduce transmission bottlenecks, and achieve a wide range of resource optimization. The economic and social benefits are very obvious. However, UHV transmission lines and oil and gas pipelines have very similar selection principles for transmission corridors, so...

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Problems solved by technology

Moreover, the research on the electromagnetic impact of UHV transmission lines on adjacent oil and gas pipelines is still blank in China.

This not only adds many uncertain factors and unnecessary difficulties to the route selection and project cost of the project, but also may affect the normal operation of adjacent oil and gas pipelines and the personal safety of nearby workers. Due to the impact of natural gas pipelines, it is very necessary to determine the protection distance and propose protection measures

[0003] The high-voltage overhead transmission line is adjacent to the oil and gas pipeline, and it will have AC electromagnetic impact on it. There are two main aspects: one is the electromagnetic impact of the long-standing AC voltage and current on the adjacent oil and gas pipeline; the other is that the transmission line suffers When a lightning strike or a system short-circuit fault occurs, the current passes through the inductive coupling to generate a transient induced voltage on the adjacent oil and gas pipeline. The combined total interference voltage may break down the insulation layer of the metal pipeline, or counterattack the cathodic protection equipment of the pipeline, or threaten the personal safety of pipeline operators

[0004] For the comprehensive impact of long-term normal operation of transmission lines or short-circuit faults on adjacent oil and gas pipelines, research has been done on the parallel erection of west-to-east natural gas pipelines on the 330kV Zhangjia Line in Northwest China, but the problem of pipeline corrosion Systematic regularity research has not yet been carried out on protective measures and protective measures, and recommended values ​​for the protection distance and approach distance, parallel length, and safe intersection angle between transmission lines and metal pipelines have not been proposed, and the impact on adjacent pipelines when transmission lines are struck by lightning has not been considered. Combined impact, lack of corresponding calculation model

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