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基于單片機(jī)的線路保護(hù)設(shè)計與實現(xiàn)(已修改)

2024-11-28 14:52 本頁面
 

【正文】 畢 業(yè) 設(shè) 計 ( 論 文 ) 基于單片機(jī)的線路保護(hù) 設(shè)計 與 實現(xiàn) 系 別: 機(jī)電信息學(xué)院 專業(yè)名 稱: 電氣工程及其自動化 學(xué)生姓 名: 學(xué) 號: 指導(dǎo)教師姓名、職稱 : 完成日期 2020 年 12 月 14 日 I 論文題目:基于單片機(jī)的線路保護(hù)設(shè)計與實現(xiàn)(硬件) 專 業(yè):電氣工程及其自動化 本 科 生: (簽名) 指導(dǎo)教師: (簽名) 摘要 電力作為一種高級、清潔、方便的能源利用形式,正越來越廣泛地應(yīng)用于經(jīng)濟(jì)社會的各個方面。電力系統(tǒng)運行的安全性是形成系統(tǒng)威脅的主要問題,然而電力系統(tǒng)中的故障卻是不可避免的。為確保系統(tǒng)安全穩(wěn)定運行,增強供電的可靠性和連續(xù)性,就需要一個優(yōu)質(zhì)的故障診斷分析系統(tǒng)。輸電線路,它連接著電源和各種用電設(shè)備,實現(xiàn)電能的傳輸任務(wù)。當(dāng)輸電線路發(fā)生短路故障時,短路電流比正常工作電流大許多倍,產(chǎn)生巨大的熱效應(yīng)和力效應(yīng)。這不僅危及線路的本身的運行,而且給整個電力系統(tǒng)的安全穩(wěn)定運行帶 來了隱患。本設(shè)計對采用單片機(jī)構(gòu)成結(jié)構(gòu)簡單,成本低,使用方便的三段式電流保護(hù)裝置的硬件結(jié)構(gòu)、軟件設(shè)計進(jìn)行了研究,設(shè)計了一種基于 AT89S52 單片機(jī)的輸電線路電流保護(hù)裝置。本論文重要包括二大部分的內(nèi)容。第一部分介紹了微機(jī)保護(hù)的相關(guān)知識;第二部分為單片機(jī)實現(xiàn)線路過流保護(hù)的硬件電路設(shè)計,包括模擬電流輸入、單片機(jī)系統(tǒng)、繼電器動作、以及按鍵和顯示電路,并介紹了了 LM32 AD080 LF398 等芯片 。 關(guān)鍵詞 : 單片機(jī); 繼電保護(hù);電流保護(hù);電流 。 研究類型 : 應(yīng)用研究 II Subject: Based on SCM line protection ( hardware) Specialty: Electric Engineering and it’s Automation Name: Liu YongJin (Signature) Instructor: Fu ZhouXing (Signature) Abstract Electric power as a senior, clean, convenient energy use form, is widely used in the aspects of economic society. Power system operation safety of the main threat is to form a system problem, however, is the power system fault inevitable. To ensure the safe and stable operation of the system, strengthen the power supply reliability and continuity, you need a high quality fault diagnosis analysis system. Power lines, it connects the power and all kinds of electric equipment, realize power transmission task. When the transmission lines happen when the fault than normal working current short circuit current many times, the enormous heating and power effect. This not only endanger lines of the operation itself, and the whole power system for the safe and stable operation of brought hidden trouble. This design by single chip microputer constitutes of simple structure, low cost and convenience 3sectional current protection device of the hardware structure and software design research, design a kind of 52 single chip microputer based on MCS transmission line current protection device. This paper includes two most important content. The first part introduces the microputer protection related knowledge; The second part is the single chip microputer transmission line current protection hardware circuit design, the design of the simulation, the input channel and singlechip microputer system, switching output channel and the keyboard and show circuit,and introduce LM324, it AD0809, LF398 chip, etc. Keywords: Single chip microputer; The relay protection; Current protection; current. Type of research: applied research 目錄 目錄 ................................................................................................................................................. 1 1 緒論 .............................................................................................................................................. 1 選題的目的和意義 .................................................................................................................. 1 電力系統(tǒng)繼電保護(hù)的任務(wù) ...................................................................................................... 1 繼電保護(hù)裝置原理和裝置的組成 .......................................................................................... 2 繼電保護(hù)的原理 ................................................................................................................... 2 繼電保護(hù)裝置的構(gòu)成 ........................................................................................................... 3 繼電保護(hù)的基本要求 .............................................................................................................. 3 選擇性 ................................................................................................................................... 3 速動性 ................................................................................................................................... 3 靈敏性 ................................................................................................................................... 4 可靠性 ................................................................................................................................... 4 微機(jī)保護(hù)系統(tǒng)的簡介 .............................................................................................................. 4 繼電保護(hù)的發(fā)展過程 ........................................................................................................... 4 微機(jī)保護(hù)的特點 ................................................................................................................... 4 2 輸電線路電流保護(hù)的原理 ......................................................................................................... 6 三段式保護(hù)的基本概述 .......................................................................................................... 6 三段式電流保護(hù)的整定方式 .................................................................................................. 6 電流速斷保護(hù)(第Ⅰ段) ................................................................................................... 6 限時電流速斷保護(hù)(第Ⅱ段) ........................................................................................... 8 定時限過電流保護(hù)(第Ⅲ段) ........................................................................................... 9 3 單片機(jī)實現(xiàn)輸電線路電流保護(hù)的硬件總體設(shè)計 .................................................................... 11 系統(tǒng)的基本結(jié)構(gòu) .................................................................................................................... 11 硬件設(shè)計中器件的選擇 ........................................................................................................ 11 單片機(jī)的簡介 ..........................................................................................
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