基于CDEGS仿真计算的变电站接地系统设计及应用研究
发布时间：2018-11-10 08:57
【摘要】：随着科学技术的不断进步和经济的飞速发展,社会对电力发展的需求急速提升,变电站、输电线路等电网基础设施的建设不断增多。电力行业是一个超前于社会发展的行业,电力系统容量增速必须超前于经济发展的速度。作为电力系统中能量交汇的枢纽,必须要保证变电站的安全稳定运行,而变电站的接地系统作为确保变电站安全稳定运行的第一道门户,自然而然的成为保障人身、电网和设备安全的一项重要措施。为确保变电站投运后接地网的安全,需要严格控制接地网的设计、敷设等工序,而变电站接地网的设计,作为接地系统的最初源头,其质量的好快直接关系到接地网故障后的隐患处理情况。接地技术的发展经历了两个阶段,过去对于接地技术的研究往往只注重对接地电阻数值的控制,对于变电站内的接地网,控制接地电阻的数值在一个合格的范围之内即刻。现如今对接地技术的研究则涉及到对接触电位差以及跨步电位差等参数的研究、分析及应用。对变电站接地系统进行研究设计时,首先需要对拟建变电站地区的土壤结构进行研究,进而根据不同地区土壤结构的分析结果因地制宜进行设计,设计效果既要满足站内设备安全运行以及对人身安全的要求。随着对接地技术研究的不断深入,对接地系统各项指标参数的计算也变得越来越精确。目前全球有多个厂商及研究机构开发了多种高效、准确的计算接地系统的软件系统。本文的主要工作是基于CDEGS软件系统中的各个模块对变电站接地网设计的工作进行整合。首先运用其中RESAP模块的功能对土壤视在电阻率与测量间距之间的关系进行分析计算,建立拟建址地的土壤实际分层结构模型,其次运用FCDIST模块计算故障电流在接地系统以及接入其中的架空地线或者中性线间的分布情况,最后运用Malz模块对变电站接地系统的安全性进行分析,对各项因素对地表跨步电压分布的影响进行模拟。最后将对此变电站接地网的设计应用于目前在建的500kV变电站工程,确定该变电站接地网的设计方案,并结合建成的接地网实测接地电阻反演校验仿真计算的准确性。
[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.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM862;TM63
本文编号：2321980
[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.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM862;TM63
【参考文献】
相关期刊论文 前1条
1 方静;陈海焱;;变电站接地的现状及相关设计技术的探讨[J];华东电力;2009年12期
，本文编号：2321980
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