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1、 学号_ _ 密级_ 武汉大学本科毕业论文 谐振基地系统单相接地故障选线研究院（系）名 称：电气工程学院专 业 名 称 ：电气工程及其自动化学 生 姓 名 ：指 导 教 师 ： 二一二年三月BACHELORS DEGREE THESIS OF WUHAN UNIVERSITYResonator base system single-phase grounding fault line selection researchCollege ：Electrical engeering collegeSubject ：Electrical engeering and automationName ：
2、Directed by ：Yuan Jiaxin Vice professor March 2012郑 重 声 明本人呈交的学位论文，是在导师的指导下，独立进行研究工作所取得的成果，所有数据、图片资料真实可靠。尽我所知，除文中已经注明引用的内容外，本学位论文的研究成果不包含他人享有著作权的内容。对本论文所涉及的研究工作做出贡献的其他个人和集体，均已在文中以明确的方式标明。本学位论文的知识产权归属于培养单位。本人签名： 日期： 摘 要本文所研究的课题主要涉及到 35kV、10kV 及其以下的中低压配电网，最主要的是 10kV 中压配电网。配电网络(Distribution Network)是电力
3、系统中二次降压变电所低压侧降压后直接向用户供电的网络，一般由多条出线（架空线路或电缆线路）、降压变压器、断路器与各种开关、接地装置、通信与控制设备、测量与计量仪表及继电保护与选线装置等构成，按照一定的规则运行，以高质量的电能持续满足用户的需求。在快速发展的现代社会，用电设备不断增多，不但对电能需求量越来越大，而且对供电可靠性的要求也越来越高，电网尤其是中低压配电网的容量不断扩大，其范围不断延伸，线路分支、走向复杂，电缆线路日益增多，在设计施工中质量不易保证，一方面使电网的运行可靠性降低，运行中发生接地故障的几率大大增加，另一方面电网的对地电容越来越大，一旦发生接地故障，很容易在接地点产生电弧，
4、不但严重威胁着电力系统安全和人身安全，而且极大影响着供电可靠性，必须限制接地故障造成的危害并及时准确的排除故障。选择合适的接地方式是限制接地故障危害的有效途径，与之配合的选线或故障定位是排除故障的重要手段。运行经验表明，电压等级越低，接地故障越多。从故障类型来看，最常见的是单相接地故障，约占80%以上。单相接地故障状况往往比较复杂，配电网在单相接地故障下的选线问题是接地故障处理中最具代表性的问题。关键词：谐振接地，单相接地，故障，选线AbstractThis project mainly involves 35kV, 10kV and below in the low voltage dist
5、ribution network, the most important is 10kV medium voltage distribution network. Distribution network ( Distribution Network ) is the power system of two substation low pressure side pressure directly to user power supply network, generally consisting of a plurality of outlet ( overhead line or cab
6、le ), a step-down transformer, circuit breaker and switch, grounding device, communication and control equipment, measurement and meter and relay protection and line selection device and so on, according to certain rules of operation, to high quality power can continue to meet the needs of users.In
7、the rapid development of modern society, electrical equipment is ceaseless grow in quantity, not only for the electricity demand is bigger and bigger, and the power supply reliability requirements are also getting higher and higher, especially in the low voltage distribution power network capacity e
8、xpansion, its limits is ceaseless and outspread, line branch, to the complex, cable line is increasing, in the design of construction quality can not be guaranteed, on one hand the operation reliability of power grid is reduced,operation of the grounding fault probability increases greatly, on the o
9、ther hand, capacitance to ground of the network is more and more big, when grounding fault occurs, easily in the grounding arc, not only seriously threaten the safety of power system and security of the person, but also greatly affects the reliability of power supply, must be restricted earth fault
10、harm and timely and accurate troubleshooting. Selection of suitable grounding mode is restricted earth fault hazard in an effective way, and meet the line selection and fault location is an important means of troubleshooting.Operation experience suggests, voltage level is low, grounding fault more.
11、From the point of fault types, the most common is the single-phase grounding fault, occupy 80% above about. Single phase to ground fault in distribution network are often more complicated, in single phase to ground fault line selection problems under ground fault processing of the most representativ
12、e problem.Key Words: Resonant grounding, grounding, fault, line selection目 录第1章 绪论 1.1 配电网接地方式的发展趋势11.2 小电流接地方式对选线的影响21.3 选线问题的难点41.3.1 信息采集问题51.3.2 选线原理的科学性51.3.3 选线的基本要求5第2章 谐振接地系统单相接地故障的理论分析及Matlab建模2.1 谐振接地系统单相接地故障的理论分析72.1.1 稳定接地时中性点位移电压的变化规律82.1.2 电抗折算112.1.3 消弧线圈的工作原理132.2 谐振接地电网的Matlab建模14第3章 小电流接地系统选线技术的分析与讨论3.1 故障信号的来源163.2 小电流接地系统选线方法的分析与评述163.2.1 谐振接地方式下的选线方法173.3 小电流接地选线装置的发展趋势20第4章 基于调节脱谐度的选线方案 4.1基于调节脱谐度的选线判据214.1.1 零序电流幅值的增减型判据214.1.2 零序电流幅值的比值型判据244.2 仿真验证26结论33致 谢34参考文献35第1章 绪论1.1 配电网接地方式的发展趋势电力系统中性点的接地方式是一个涉及到技术、经济、安全等多个方面的综合问题。它可划分为两类，凡是需要断路器遮断单相接地故障者，属于中性点有效接地的方式
