本文選題：交流輸電線路　切入點：埋地油氣管道　出處：《華北電力大學》2017年碩士論文　論文類型：學位論文

【摘要】：電力行業(yè)與石油天然氣能源行業(yè)極為相近的傳輸路徑,使得電力輸電線路對油氣管道的電磁影響問題日益突出,因此研究電力線路對埋地油氣管道的交流干擾問題對維護油氣管道安全有效的持久運行至關重要。本文結合甘肅省電力設計院項目“750kV交流線路對多條埋地油氣管道的電磁影響研究”,主要研究了高壓交流輸電線路對交叉穿越下方油氣管道的電磁干擾問題,并提出了緩解交流干擾的防護措施方案。本文首先通過分析交流輸電線路對油氣管道電磁影響后果所涉及到的主要問題及其相關的限值標準,給出了本文電磁影響后果評價所依據(jù)的限值;在基于矩量法的電磁仿真軟件CDEGS中搭建了750kV交流輸電線路對多條埋地油氣管道電磁影響的仿真模型�；谒罱ǖ碾姶庞绊懩Ｐ�,本文針對750kV交流輸電線路正常運行、單相接地短路故障以及雷擊輸電線路三種運行狀態(tài),分別計算求得了交流線路不同運行狀態(tài)下不同土壤電阻率時油氣管道上的干擾電壓有效值分布,探究了雷擊條件下管道接近桿塔接地體中心距離、不同雷擊點對管道干擾電壓的影響,并以各運行狀態(tài)下的限值標準為評價準則,評估了各運行狀態(tài)下電磁影響的后果。最后對交流線路正常運行時管道干擾電壓峰值超出限值標準的西氣東輸二線管道,對其進行防護設計,提出了在交叉跨越處兩基桿塔之間加裝屏蔽防護網(wǎng)的防護措施。通過探究屏蔽網(wǎng)規(guī)格、屏蔽網(wǎng)與管道的相對位置以及屏蔽網(wǎng)與桿塔接地體的連接方式等不同因素對電磁屏蔽效果的影響,最終建立了最佳防護方案的電磁模型,通過仿真計算并與管道敷設并行裸銅帶這一已有防護措施進行對比,驗證了加裝屏蔽防護網(wǎng)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.
【學位授予單位】：華北電力大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM75

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