小电流接地系单相接地保护选线方案的研究.doc

西安交通大学网络教育学院论文 STYLEREF 标题 1 \* MERGEFORMAT 目 录PAGE VIPAGE V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 automationApplicant：Xiong ShuweiSupervisor：Duan JiandongABSTRACTSince 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 TOC \o 1-3 \h \z \u HYPERLINK \l _Toc344365226 摘　要 PAGEREF _Toc344365226 \h I HYPERLINK \l _Toc344365227 ABSTRACT PAGEREF _Toc344365227 \h III HYPERLINK \l _Toc344365228 目 录 PAGEREF _Toc344365228 \h V HYPERLINK \l _Toc344365229 1绪论 PAGEREF _Toc344365229 \h 1 HYPERLINK \l _Toc344365230 1.1 课题研究背景与意义 PAGEREF _Toc344365230 \h 1 HYPERLINK \l _Toc344365231 1.2 课题研究现状 PAGEREF _Toc344365231 \h 2 HYPERLINK \l _Toc344365232 1.3 论文的主要内容 PAGEREF _Toc344365232 \h 3 HYPERLINK \l _Toc344365233 2小电流接地系统单相接地选线方法分析与探讨 PAGEREF _Toc344365233 \h 5 HYPERLINK \l