高压交流输电线路对穿越下方油气管道的电磁影响及防护措施研究

发布时间：2018-03-19 13:37

本文选题：交流输电线路　切入点：埋地油气管道　出处：《华北电力大学》2017年硕士论文　论文类型：学位论文

【摘要】：电力行业与石油天然气能源行业极为相近的传输路径,使得电力输电线路对油气管道的电磁影响问题日益突出,因此研究电力线路对埋地油气管道的交流干扰问题对维护油气管道安全有效的持久运行至关重要。本文结合甘肃省电力设计院项目“750kV交流线路对多条埋地油气管道的电磁影响研究”,主要研究了高压交流输电线路对交叉穿越下方油气管道的电磁干扰问题,并提出了缓解交流干扰的防护措施方案。本文首先通过分析交流输电线路对油气管道电磁影响后果所涉及到的主要问题及其相关的限值标准,给出了本文电磁影响后果评价所依据的限值;在基于矩量法的电磁仿真软件CDEGS中搭建了750kV交流输电线路对多条埋地油气管道电磁影响的仿真模型。基于所搭建的电磁影响模型,本文针对750kV交流输电线路正常运行、单相接地短路故障以及雷击输电线路三种运行状态,分别计算求得了交流线路不同运行状态下不同土壤电阻率时油气管道上的干扰电压有效值分布,探究了雷击条件下管道接近杆塔接地体中心距离、不同雷击点对管道干扰电压的影响,并以各运行状态下的限值标准为评价准则,评估了各运行状态下电磁影响的后果。最后对交流线路正常运行时管道干扰电压峰值超出限值标准的西气东输二线管道,对其进行防护设计,提出了在交叉跨越处两基杆塔之间加装屏蔽防护网的防护措施。通过探究屏蔽网规格、屏蔽网与管道的相对位置以及屏蔽网与杆塔接地体的连接方式等不同因素对电磁屏蔽效果的影响,最终建立了最佳防护方案的电磁模型,通过仿真计算并与管道敷设并行裸铜带这一已有防护措施进行对比,验证了加装屏蔽防护网的有效性。
[Abstract]:The transmission paths of the electric power industry and the petroleum and natural gas energy industry are very similar, which makes the electromagnetic impact of power transmission lines on oil and gas pipelines increasingly prominent. Therefore, it is very important to study the AC interference of electric power line to buried oil and gas pipeline in order to maintain the safe and effective operation of oil and gas pipeline. This paper combined with Gansu Electric Power Design Institute project "750 kV AC line to many buried oil and gas pipeline" Study on the electromagnetic effect of the Channel. The electromagnetic interference of the HV AC transmission line to the oil and gas pipeline crossing the bottom of the channel is mainly studied. In this paper, the main problems involved in the electromagnetic impact of AC transmission lines on oil and gas pipelines and the relevant limit standards are analyzed. In this paper, the limit value of electromagnetic effect evaluation is given, and the simulation model of electromagnetic effect of 750kV AC transmission line on many buried oil and gas pipelines is built in the electromagnetic simulation software CDEGS based on moment method. This paper aims at three operating states of 750 kV AC transmission line, such as normal operation, single-phase grounding short-circuit fault and lightning strike transmission line. The effective value distribution of interference voltage on oil and gas pipeline under different operating state of AC line under different soil resistivity is calculated, and the distance of pipeline close to the center of grounding body of pole tower under lightning strike is explored. The influence of different lightning strike points on the interference voltage of the pipeline is evaluated by using the limit value standard of each operating state as the evaluation criterion. The effect of electromagnetic effect on the normal operation of AC lines is evaluated. Finally, the protection design for the pipeline with the peak interference voltage exceeding the limit standard is carried out for the second line pipeline of gas transmission from west to east during the normal operation of the AC line. The protective measures of installing shield net between two base towers at crossing crossing are put forward. The influence of different factors such as the relative position of shield net and pipeline and the connection mode between shield net and earthing body of pole tower on the electromagnetic shielding effect is established. Finally, the electromagnetic model of the best protection scheme is established. The effectiveness of installing shielded protective net is verified by simulation and comparison with the existing protective measures of pipeline laying parallel bare copper strip.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM75

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