【摘要】：礦井低壓供電的安全主要依賴于饋電開(kāi)關(guān)保護(hù)，饋電開(kāi)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(shí)現(xiàn)井下電網(wǎng)的故障檢測(cè)與保護(hù)。隨著井下電壓等級(jí)和設(shè)備容量的提升，供電距離的增加，傳統(tǒng)饋電開(kāi)關(guān)故障保護(hù)動(dòng)作速度慢，可靠性和穩(wěn)定性差的問(wèn)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(duì)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(duì)我國(guó)煤礦井下中性點(diǎn)不接地的放射式供電系統(tǒng)的特點(diǎn)，本文研究設(shè)計(jì)了一種集測(cè)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(kāi)關(guān)保護(hù)動(dòng)作慢、穩(wěn)定性和可靠性差的問(wèn)題。 首先，本文在詳細(xì)闡述礦用低壓饋電開(kāi)關(guān)保護(hù)的研究現(xiàn)狀和發(fā)展趨勢(shì)的基礎(chǔ)上，對(duì)井下供電故障的成因及對(duì)應(yīng)檢測(cè)方法進(jìn)行了分析，提出了針對(duì)性的保護(hù)方案。通過(guò)對(duì)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(dòng)狀態(tài)難以區(qū)分的問(wèn)題；提出一種新的反時(shí)限方程，較好地解決了傳統(tǒng)方法保護(hù)動(dòng)作延時(shí)時(shí)間與規(guī)定值偏差較大的問(wèn)題；設(shè)計(jì)了基于RS-485通信技術(shù)的二級(jí)選擇性漏電保護(hù)系統(tǒng)，同時(shí)考慮電網(wǎng)分布電容的影響，并給出對(duì)應(yīng)的整定值調(diào)整方案，縮短了漏電保護(hù)動(dòng)作時(shí)間，提高了保護(hù)的靈活性。零序功率方向檢測(cè)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(cè)量精度。 其次，硬件設(shè)計(jì)以ARM芯片STM32F103RB為控制核心，并對(duì)主要硬件電路設(shè)計(jì)進(jìn)行了分析。軟件設(shè)計(jì)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(jì)和程序編寫(xiě)，具有較好的靈活性和實(shí)時(shí)性。在硬件和軟件設(shè)計(jì)過(guò)程中注重抗干擾設(shè)計(jì)，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(jì)的基礎(chǔ)上，模擬井下供電環(huán)境，進(jìn)行了相關(guān)試驗(yàn)。試驗(yàn)結(jié)果表明，保護(hù)裝置在實(shí)驗(yàn)室條件下各種功能都能很好的實(shí)現(xiàn)且動(dòng)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(hào)：2453837