110kV杨岭变电站接地网优化设计研究

发布时间：2018-03-16 18:11

本文选题：变电站　切入点：接地网系统　出处：《华北电力大学》2015年硕士论文　论文类型：学位论文

【摘要】：变电站接地系统通过将电力系统和设备与地相连来维护电力系统安全可靠运行。当系统出现故障时,接地系统会将故障电流引入大地,限制系统最大的电压抬升,从而保证人员和设备的安全。近几年,我国电力系统不断发展,与此同时,由于接地系统设计不合理,接地电阻不符合要求而导致大故障电流事故屡见不鲜,不仅经济损失巨大,而且对社会造成严重的间接经济损失。基于此,本文提出变电站接地系统的优化设计方法,以使地表电位均匀分布,跨步和接触电压都显著减小。本文首先分析变电站接地系统的意义、难点及常用的降低接地电阻的方法,然后对变电站接地系统电阻、故障电流、土壤结构情况进一步研究,并建立相应模型,特别对分流系数的原理及影响因素进行了分析。通过考虑变电站安全指标对接地系统设计的影响,提出多种接地系统设计方案进行比较分析。最后分析变电站主要隔离措施的设计,并以杭州110kV杨岭变电站接地网为例,对其接地网系统进行优化设计并对提出的设计方案进行评估。
[Abstract]:The substation grounding system maintains the safe and reliable operation of the power system by connecting the power system and equipment to the ground. When the system fails, the grounding system will introduce the fault current into the earth, limiting the maximum voltage lift of the system. So as to ensure the safety of personnel and equipment. In recent years, the power system of our country has been developing continuously. At the same time, due to the unreasonable design of the grounding system and the failure of grounding resistance to meet the requirements, it is common to see large fault current accidents. Not only the economic loss is huge, but also the social indirect economic loss is serious. Based on this, this paper puts forward the optimization design method of substation grounding system, in order to make the surface potential distribute evenly. In this paper, the significance, difficulties and common methods of reducing grounding resistance of substation grounding system are analyzed, and then the resistance, fault current and soil structure of substation grounding system are further studied. The corresponding model is established, especially the principle of shunt coefficient and the influencing factors are analyzed. The influence of substation safety index on the design of grounding system is considered. Finally, the design of main isolation measures of substation is analyzed, and the grounding network of 110 kV Yangling substation in Hangzhou is taken as an example. The grounding grid system is optimized and the proposed design scheme is evaluated.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM862;TM63

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