变电站接地系统应用研究
发布时间：2018-10-21 19:39
【摘要】：电力系统的接地问题是一个看似简单、而实际上却非常复杂又至关重要的问题,它直接关系到人身及设备的安全。为了正确应用接地技术，提高电网防雷击，避免短路电流造成人员伤害，有必要对电网接地技术进行深入的研究。特别是随着国民经济的发展，电力系统的跨越式发展，电网规模急剧扩大，接地短路电流越来越大，电网因接地网因素造成的雷击跳闸、雷击过电压、过电流保护事故越来越受到重视，随着各种微机监控设备的普遍应用，对接地的要求也越来越高。接地系统不仅仅对工频接地电阻，而且对冲击接地电阻、热稳定、设备接触电压、跨步电压、地电位干扰也有一系列的要求。在上饶地区以前由于接地系统的问题而引起的主设备损坏、变电所停运等事故多有发生，给电网的安全稳定运行带来了很大的危害，因而电力系统的接地问题现在受到了高度的重视，特别是对新建变电站接地的要求越来越高。 本论文简单介绍了接地系统的理论和接地系统的理论计算公式，，土壤电阻率及其相关的计算公式，并介绍了如何实测土壤电阻率及其接地电阻。拟采用的接地设计方案及其技术经济比较；详细论述了变电站接地网的设计步骤及接地系统的施工工艺。介绍了几种常见的降阻措施，综合枫领头变电站接地网设计的具体实例，因地制宜地左设计方案，实施后接地电阻、接触电压和跨步电压均达到了设计的要求。本人希望此设计实例在解决实际的接地问题时能起到指导和借鉴作用。,在电力系统的实际工程中具有一定的意义。
[Abstract]:The grounding problem of power system is a seemingly simple, but in fact very complex and crucial problem, which is directly related to the safety of personal and equipment. In order to apply the grounding technology correctly, to improve the lightning protection of the power network and to avoid the personnel injury caused by the short-circuit current, it is necessary to deeply study the grounding technology of the power network. Especially with the development of national economy and the leap-forward development of electric power system, the scale of power grid expands rapidly, the grounding short-circuit current becomes larger and larger, the lightning tripping and lightning overvoltage caused by the factors of grounding grid. More and more attention has been paid to the accident of over-current protection. With the widespread application of various microcomputer monitoring equipment, the requirement of grounding is becoming more and more high. Grounding system has a series of requirements not only for power frequency grounding resistance, but also for impulse grounding resistance, thermal stability, equipment contact voltage, step voltage and ground potential interference. In Shangrao area, accidents such as main equipment damage and substation outage caused by grounding system problems often occurred, which caused great harm to the safe and stable operation of the power network. Therefore, the grounding problem of power system is paid more and more attention, especially for the new substation grounding. This paper briefly introduces the theory of the grounding system and the theoretical calculation formula of the grounding system, the soil resistivity and its related calculation formulas, and how to measure the soil resistivity and its grounding resistance. The grounding design scheme and its technical and economic comparison are proposed, and the design steps of substation grounding grid and the construction technology of the grounding system are discussed in detail. This paper introduces several kinds of common measures of reducing resistance, synthesizes the concrete examples of the grounding network design of the Feng-lead substation, according to the local conditions, the left design scheme, the grounding resistance, the contact voltage and the stride voltage all meet the requirements of the design. I hope this design example can play a guiding and referential role in solving the actual grounding problem, and it is of certain significance in the practical engineering of power system.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM862;TM63
本文编号：2286159
[Abstract]:The grounding problem of power system is a seemingly simple, but in fact very complex and crucial problem, which is directly related to the safety of personal and equipment. In order to apply the grounding technology correctly, to improve the lightning protection of the power network and to avoid the personnel injury caused by the short-circuit current, it is necessary to deeply study the grounding technology of the power network. Especially with the development of national economy and the leap-forward development of electric power system, the scale of power grid expands rapidly, the grounding short-circuit current becomes larger and larger, the lightning tripping and lightning overvoltage caused by the factors of grounding grid. More and more attention has been paid to the accident of over-current protection. With the widespread application of various microcomputer monitoring equipment, the requirement of grounding is becoming more and more high. Grounding system has a series of requirements not only for power frequency grounding resistance, but also for impulse grounding resistance, thermal stability, equipment contact voltage, step voltage and ground potential interference. In Shangrao area, accidents such as main equipment damage and substation outage caused by grounding system problems often occurred, which caused great harm to the safe and stable operation of the power network. Therefore, the grounding problem of power system is paid more and more attention, especially for the new substation grounding. This paper briefly introduces the theory of the grounding system and the theoretical calculation formula of the grounding system, the soil resistivity and its related calculation formulas, and how to measure the soil resistivity and its grounding resistance. The grounding design scheme and its technical and economic comparison are proposed, and the design steps of substation grounding grid and the construction technology of the grounding system are discussed in detail. This paper introduces several kinds of common measures of reducing resistance, synthesizes the concrete examples of the grounding network design of the Feng-lead substation, according to the local conditions, the left design scheme, the grounding resistance, the contact voltage and the stride voltage all meet the requirements of the design. I hope this design example can play a guiding and referential role in solving the actual grounding problem, and it is of certain significance in the practical engineering of power system.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM862;TM63
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