本文選題：礦井低壓電網(wǎng) + 漏電故障�。� 參考：《遼寧工程技術(shù)大學(xué)》2015年碩士論文

【摘要】：由于礦井環(huán)境的特殊性使得故障信號微弱、特征不明顯、干擾較大,當(dāng)前漏電故障選線方法趨于成熟,但定位方法在實際應(yīng)用中的準(zhǔn)確性和可靠性仍然存在諸多不足,漏判、誤判的現(xiàn)象屢見不鮮,為保證對礦井供電系統(tǒng)安全可靠地供電,迅速而又準(zhǔn)確地確定故障點位置格外重要。本文以改善礦井安全為出發(fā)點,對長距離礦井低壓電網(wǎng)進行了單相漏電故障特征分析,以零序電流邏輯關(guān)系和零序電流互感器性能為基礎(chǔ),構(gòu)造全新三互感器緊湊型電網(wǎng)結(jié)構(gòu),以人為中性點經(jīng)阻抗線圈接地的方式補償故障電流以減輕危害,分別運用相對熵、差動特征量等理論和概念對漏電故障選線定位加以分析,提出基于差動特征量概念的差動式漏電故障選線算法和基于小波包能量譜相對熵的漏電故障定位算法,并根據(jù)各自的算法流程搭建Matlab模型仿真分析,仿真結(jié)果表明：本文研究的兩種算法各有特色,但都能對漏電故障實現(xiàn)準(zhǔn)確的定位；在實驗室環(huán)境下搭建基于差動特征量算法的模擬系統(tǒng)進行漏電保護裝置的設(shè)計與開發(fā)；實驗結(jié)果表明：基于差動特征量的算法及其漏電保護裝置能正確選線,與仿真結(jié)果一致。
[Abstract]:Because of the particularity of mine environment, the fault signal is weak, the characteristic is not obvious, and the interference is large. The current fault line selection method of leakage current tends to be mature, but the accuracy and reliability of the location method in the practical application still exist many shortcomings. In order to ensure the safe and reliable power supply to mine power supply system, it is very important to determine the location of fault point quickly and accurately. In order to improve mine safety, this paper analyzes the fault characteristics of single phase leakage in long distance mine low voltage network. Based on the logic relation of zero sequence current and the performance of zero sequence current transformer, a new three transformer compact network structure is constructed. The fault current is compensated by artificial neutral point through impedance coil to reduce the harm. The relative entropy and differential characteristic quantity are used to analyze the location of leakage fault line. A differential fault line detection algorithm based on the concept of differential eigenvalue and an algorithm for locating leakage fault based on relative entropy of wavelet packet energy spectrum are proposed, and the simulation analysis of Matlab model is built according to the respective algorithm flow. The simulation results show that the two algorithms studied in this paper have their own characteristics, but both of them can accurately locate the leakage fault, and the simulation system based on the differential characteristic quantity algorithm is built in the laboratory to design and develop the leakage protection device. The experimental results show that the algorithm based on differential eigenvalue and its leakage protection device can select the line correctly, which is consistent with the simulation results.
【學(xué)位授予單位】：遼寧工程技術(shù)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TD611.5;TM564.8

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