【摘要】：礦井低壓供電的安全主要依賴于饋電開關(guān)保護(hù)，饋電開關(guān)是礦井低壓供電系統(tǒng)中非常重要的電氣設(shè)備，其最主要的功能是實現(xiàn)井下電網(wǎng)的故障檢測與保護(hù)。隨著井下電壓等級和設(shè)備容量的提升，供電距離的增加，傳統(tǒng)饋電開關(guān)故障保護(hù)動作速度慢，可靠性和穩(wěn)定性差的問題越發(fā)突出，難以滿足井下低壓電網(wǎng)安全、連續(xù)、可靠供電的要求。因此，對饋電保護(hù)技術(shù)進(jìn)行研究，提高保護(hù)裝置的性能是十分必要的。 針對我國煤礦井下中性點不接地的放射式供電系統(tǒng)的特點，本文研究設(shè)計了一種集測控、故障保護(hù)、通信等功能于一體的新型綜合保護(hù)裝置，采用ARMCortex-M3處理器和μC/OS-Ⅱ嵌入式系統(tǒng)，較好地解決了傳統(tǒng)饋電開關(guān)保護(hù)動作慢、穩(wěn)定性和可靠性差的問題。 首先，本文在詳細(xì)闡述礦用低壓饋電開關(guān)保護(hù)的研究現(xiàn)狀和發(fā)展趨勢的基礎(chǔ)上，對井下供電故障的成因及對應(yīng)檢測方法進(jìn)行了分析，提出了針對性的保護(hù)方案。通過對比功率因素的大小，比較有效地解決三相短路與電機(jī)起動狀態(tài)難以區(qū)分的問題；提出一種新的反時限方程，較好地解決了傳統(tǒng)方法保護(hù)動作延時時間與規(guī)定值偏差較大的問題；設(shè)計了基于RS-485通信技術(shù)的二級選擇性漏電保護(hù)系統(tǒng)，同時考慮電網(wǎng)分布電容的影響，并給出對應(yīng)的整定值調(diào)整方案，縮短了漏電保護(hù)動作時間，提高了保護(hù)的靈活性。零序功率方向檢測采用基于全相位傅立葉變換的軟件比相方法，，提高了相位測量精度。 其次，硬件設(shè)計以ARM芯片STM32F103RB為控制核心，并對主要硬件電路設(shè)計進(jìn)行了分析。軟件設(shè)計采用μC/OS-Ⅱ嵌入式系統(tǒng)，按照模塊化思想進(jìn)行任務(wù)設(shè)計和程序編寫，具有較好的靈活性和實時性。在硬件和軟件設(shè)計過程中注重抗干擾設(shè)計，采用了多種抗干擾措施，提高了系統(tǒng)可靠性。 最后，在完成設(shè)計的基礎(chǔ)上，模擬井下供電環(huán)境，進(jìn)行了相關(guān)試驗。試驗結(jié)果表明，保護(hù)裝置在實驗室條件下各種功能都能很好的實現(xiàn)且動作穩(wěn)定可靠。
[Abstract]:The safety of mine low-voltage power supply mainly depends on the feeder switch protection. The feeder switch is a very important electrical equipment in the mine low-voltage power supply system. Its main function is to realize the fault detection and protection of underground power network. With the increase of downhole voltage level and equipment capacity and the increase of power supply distance, the problems of slow operation speed, poor reliability and stability of traditional feeder switch fault protection become more and more prominent, and it is difficult to meet the safety and continuity of underground low-voltage power network. Requirements for reliable power supply. Therefore, it is necessary to study the feed protection technology and improve the performance of the protection device. In view of the characteristics of radioactive power supply system with ungrounded neutral point in coal mine of our country, this paper designs a new type of comprehensive protection device, which integrates the functions of measurement and control, fault protection, communication and so on. The ARMCortex-M3 processor and 渭 C OS-鈪

本文編號：2453837