井下供电系统选择性漏电保护的研究

发布时间：2018-06-02 06:22

本文选题：漏电保护 + 互距离度　；参考：《安徽理工大学》2015年硕士论文

【摘要】：漏电是井下电网的主要故障形式之一,具有极大的危害性,可能导致人身触电、单相接地、相间短路等情况,且短路时产生的电火花可能引起瓦斯和煤尘爆炸。由于矿井环境的恶劣性,井下电网漏电保护系统必须具有可靠性、速动性和选择性,必须具有可靠判漏、立即动作跳闸、准确切除故障线路的功能。本文首先分析稳态情况下常用的几种漏电保护方法,分别介绍它们的优缺点。其次分析基于暂态过程特征量进行漏电保护研究的实用意义,并利用瞬间对称分量变换法,建立单相漏电瞬间时序网络模型,描述整个漏电过程的稳态和暂态分量。然后分析在暂态情况下不同特征量对矿井漏电保护的影响,详细研究基于信号距离度的选漏方法和基于绝对关联度的选漏方法,并进行对比分析,比较两者的选漏效果和优缺点。将这些特点作为融合证据进行融合选漏,从而提高选漏的准确性。本文通过对660V矿井模拟电网仿真验证,运用仿真软件MATLAB在计算机上对不同方法进行仿真模拟,仔细对比分析仿真波形、仿真数据,总结分析试验数据,验证该系统能够实现漏电判断和漏电支路的有效选择,表明系统具有可靠性、灵敏性高和能准确选择漏电支路。
[Abstract]:Leakage is one of the main fault forms of underground power network, which may cause personal shock, single-phase grounding, inter-phase short circuit and so on, and the electric spark caused by short-circuit may cause gas and coal dust explosion. Due to the malice and inferiority of mine environment, the leakage protection system of underground power network must be reliable, quick and selective, and must have the function of judging leakage reliably, tripping immediately and removing fault lines accurately. In this paper, several leakage protection methods in steady state are analyzed, and their advantages and disadvantages are introduced. Secondly, the practical significance of the research on leakage protection based on transient process characteristic is analyzed, and the transient time-series network model of single-phase leakage is established by using the instantaneous symmetric component transformation method to describe the steady-state and transient components of the whole leakage process. Then, the influence of different characteristics on mine leakage protection under transient condition is analyzed. The leakage selection method based on signal distance and the method based on absolute correlation degree are studied in detail, and compared with each other. The leakage selection effect, advantages and disadvantages of the two are compared. These features are used as fusion evidence to improve the accuracy of leakage selection. In this paper, through the simulation verification of 660V mine power network, the simulation software MATLAB is used to simulate the different methods on the computer. The simulation waveform and simulation data are carefully compared and analyzed, and the test data are summarized and analyzed. It is verified that the system can realize leakage judgement and effective selection of leakage branch, which shows that the system is reliable, sensitive and accurate in selecting leakage current branch.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD611.5

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