本文選題：漏電保護 + 互距離度�。� 參考：《安徽理工大學》2015年碩士論文

【摘要】：漏電是井下電網(wǎng)的主要故障形式之一,具有極大的危害性,可能導致人身觸電、單相接地、相間短路等情況,且短路時產(chǎn)生的電火花可能引起瓦斯和煤塵爆炸。由于礦井環(huán)境的惡劣性,井下電網(wǎng)漏電保護系統(tǒng)必須具有可靠性、速動性和選擇性,必須具有可靠判漏、立即動作跳閘、準確切除故障線路的功能。 本文首先分析穩(wěn)態(tài)情況下常用的幾種漏電保護方法,分別介紹它們的優(yōu)缺點。其次分析基于暫態(tài)過程特征量進行漏電保護研究的實用意義,并利用瞬間對稱分量變換法,建立單相漏電瞬間時序網(wǎng)絡(luò)模型,描述整個漏電過程的穩(wěn)態(tài)和暫態(tài)分量。然后分析在暫態(tài)情況下不同特征量對礦井漏電保護的影響,詳細研究基于信號距離度的選漏方法和基于絕對關(guān)聯(lián)度的選漏方法,并進行對比分析,比較兩者的選漏效果和優(yōu)缺點。將這些特點作為融合證據(jù)進行融合選漏,從而提高選漏的準確性。本文通過對660V礦井模擬電網(wǎng)仿真驗證,運用仿真軟件MATLAB在計算機上對不同方法進行仿真模擬,仔細對比分析仿真波形、仿真數(shù)據(jù),總結(jié)分析試驗數(shù)據(jù),驗證該系統(tǒng)能夠?qū)崿F(xiàn)漏電判斷和漏電支路的有效選擇,表明系統(tǒng)具有可靠性、靈敏性高和能準確選擇漏電支路。
[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.
【學位授予單位】：安徽理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TD611.5

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