【摘要】：隨著科學技術(shù)的不斷進步和經(jīng)濟的飛速發(fā)展,社會對電力發(fā)展的需求急速提升,變電站、輸電線路等電網(wǎng)基礎設施的建設不斷增多。電力行業(yè)是一個超前于社會發(fā)展的行業(yè),電力系統(tǒng)容量增速必須超前于經(jīng)濟發(fā)展的速度。作為電力系統(tǒng)中能量交匯的樞紐,必須要保證變電站的安全穩(wěn)定運行,而變電站的接地系統(tǒng)作為確保變電站安全穩(wěn)定運行的第一道門戶,自然而然的成為保障人身、電網(wǎng)和設備安全的一項重要措施。為確保變電站投運后接地網(wǎng)的安全,需要嚴格控制接地網(wǎng)的設計、敷設等工序,而變電站接地網(wǎng)的設計,作為接地系統(tǒng)的最初源頭,其質(zhì)量的好快直接關(guān)系到接地網(wǎng)故障后的隱患處理情況。接地技術(shù)的發(fā)展經(jīng)歷了兩個階段,過去對于接地技術(shù)的研究往往只注重對接地電阻數(shù)值的控制,對于變電站內(nèi)的接地網(wǎng),控制接地電阻的數(shù)值在一個合格的范圍之內(nèi)即刻。現(xiàn)如今對接地技術(shù)的研究則涉及到對接觸電位差以及跨步電位差等參數(shù)的研究、分析及應用。對變電站接地系統(tǒng)進行研究設計時,首先需要對擬建變電站地區(qū)的土壤結(jié)構(gòu)進行研究,進而根據(jù)不同地區(qū)土壤結(jié)構(gòu)的分析結(jié)果因地制宜進行設計,設計效果既要滿足站內(nèi)設備安全運行以及對人身安全的要求。隨著對接地技術(shù)研究的不斷深入,對接地系統(tǒng)各項指標參數(shù)的計算也變得越來越精確。目前全球有多個廠商及研究機構(gòu)開發(fā)了多種高效、準確的計算接地系統(tǒng)的軟件系統(tǒng)。本文的主要工作是基于CDEGS軟件系統(tǒng)中的各個模塊對變電站接地網(wǎng)設計的工作進行整合。首先運用其中RESAP模塊的功能對土壤視在電阻率與測量間距之間的關(guān)系進行分析計算,建立擬建址地的土壤實際分層結(jié)構(gòu)模型,其次運用FCDIST模塊計算故障電流在接地系統(tǒng)以及接入其中的架空地線或者中性線間的分布情況,最后運用Malz模塊對變電站接地系統(tǒng)的安全性進行分析,對各項因素對地表跨步電壓分布的影響進行模擬。最后將對此變電站接地網(wǎng)的設計應用于目前在建的500kV變電站工程,確定該變電站接地網(wǎng)的設計方案,并結(jié)合建成的接地網(wǎng)實測接地電阻反演校驗仿真計算的準確性。
[Abstract]:With the continuous progress of science and technology and the rapid development of economy, the demand for power development is rising rapidly, and the construction of power network infrastructure such as substations and transmission lines is increasing. Power industry is an industry ahead of social development, power system capacity growth must be ahead of the speed of economic development. As the junction of energy in the power system, it is necessary to ensure the safe and stable operation of the substation, and the grounding system of the substation, as the first gateway to ensure the safe and stable operation of the substation, naturally becomes the protection of the person. An important measure for the safety of power grids and equipment. In order to ensure the safety of the grounding grid after the substation is put into operation, it is necessary to strictly control the design and laying of the grounding grid, and the design of the grounding grid of the substation is the initial source of the grounding system. Its good quality is directly related to the handling of hidden trouble after grounding network fault. The development of earthing technology has gone through two stages. In the past, the research of grounding technology only focused on the control of the value of grounding resistance, and for the grounding grid in substation, the value of controlling grounding resistance was within a qualified range. Nowadays, the research of grounding technology involves the research, analysis and application of contact potential difference and stride potential difference. In the research and design of substation grounding system, it is necessary to study the soil structure of the proposed substation area first, and then design the soil structure according to the local conditions according to the analysis results of the soil structure in different areas. The design effect should meet the requirements of safe operation and personal safety of equipments in the station. With the development of grounding technology, the calculation of the parameters of grounding system becomes more and more accurate. At present, many manufacturers and research institutions all over the world have developed a variety of efficient and accurate software systems for calculating grounding systems. The main work of this paper is to integrate the design of substation grounding grid based on each module of CDEGS software system. Firstly, using the function of RESAP module, the relationship between apparent resistivity and measurement spacing is analyzed and calculated, and the actual soil stratification structure model of the proposed site is established. Secondly, FCDIST module is used to calculate the distribution of fault current between grounding system and overhead ground line or neutral line connected to it. Finally, Malz module is used to analyze the security of substation grounding system. The influence of various factors on the surface step voltage distribution is simulated. Finally, the design of the grounding grid of the substation is applied to the 500kV substation project under construction at present, and the design scheme of the grounding grid of the substation is determined, and the accuracy of the simulation calculation of the inversion calculation of the measured grounding resistance of the grounding network is also given.
【學位授予單位】：山東大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TM862;TM63

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相關(guān)期刊論文 前1條

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本文編號：2321980