文档介绍：论文
对小电流接地系统单相接地保护选线方案的研究
学科(专业):电力系统及其自动化
摘要
小电流接地方式由于在保证运行维护人员的安全、过电压水平、设备绝缘水平、经济性等方面存在诸多的优点,所以一直被应用于我国的中低压电网中。在生产实际中,中低压线路的故障,有70%以上都是单相接地故障,所以,寻找一种选线准确率高的保护装置,仍然具有相当重要的理论和实用价值。
文章主要针对小电流系统单相接地选线方法进行了分析,研究了小电流接地故障暂态算法和稳妥算法,并重点分析了多判据信息融合选线方法。文章最后进行了小电流系统选线方法问题的分析。
关键词:小电流接地系统;单相接地;故障选线;多判据
论文类型:应用研究
Title:Project of line selection for small current grounding system of single-phase grounding protection research
Speciality: Electricity and its automation
Applicant:Xiong Shuwei
Supervisor:Duan Jiandong
ABSTRACT
Since small current grounding operation and maintenance personnel in ensuring the safety of over-voltage levels, equipment insulation levels, and there exist many economic advantages, it has been applied to low-voltage power grid in China. In actual production, the low-pressure line failure, more than 70% are single-phase ground fault, therefore, to find a select line of high accuracy of the protection device, still has a very important theoretical and practical value.
This article mainly current system of small single-phase line selection method of analysis of the small current grounding fault transient algorithm and secure algorithm, and analyzed the wavelet analysis and its electric power system. Finally a simulation study.
KEY WORDS: system with non-effectively earthed neutral;single-phase-to-ground fault;fault line selection;
TYPE OF THESIS:application
目录
摘要 I
ABSTRACT III
目录 V
1绪论 1
课题研究背景与意义 1
课题研究现状 2
论文的主要内容 3
2小电流接地系统单相接地选线方法分析与探讨 5
5
5
5
6
6
6
6
7
7
7
7
3 多判据信息融合选线方法 9
9
9
9
9
综合选线方案 10
10
4 小电流系统选线问题 12
12
12
13
5结论与展望 15
致谢 17
参考文献 19
声明
1绪论
课题研究背景与意义
电力系统常用的系统接地方式有四种:中性点直接接地,中性点经电阻接地,中性点不接地和中性点经消弧线圈接地。而上述的四种方法可归结为三类接地系统:中性点直接接地或经一低阻抗接