【正文】 sure the safty of the power supply system.In this design,the basic principles of SF6 circuit breaker can be summarized as that the humidity sensor, temperature sensor and pressure sensor are connected to the SF6 gas room by the jointer,which can survey the humidity, temperature, pressure of SF6 gas. the measured analog go through the A / D conversion, data analysis in the PIC16F877 microcontroller, to implement data overrun alarm and demonstrate temperature, pressure and information transmission between slaves and the master generates a standard munication packets based on MODBUS protocol to achieve realtime control.Keyword: PIC16F877 microcontroller。下位機(jī)與上位機(jī)的通訊遵循 MODBUS通訊協(xié)議，生成標(biāo)準(zhǔn)通信數(shù)據(jù)包。本次設(shè)計的 SF6斷路器微水在線監(jiān)測系統(tǒng)的基本原理為：將濕度、溫度、壓力傳感器通過連接器件連接到 SF6氣室，測量氣室內(nèi) SF6氣體的濕度、溫度、壓力。蘭州理工大學(xué)畢業(yè)設(shè)計說明書I摘 要SF6斷路器微水在線監(jiān)測儀以 PIC16F877單片機(jī)作為處理器，來實現(xiàn)實時監(jiān)測 SF6氣體的溫度、濕度及壓力，從而得知斷路器的運(yùn)行狀態(tài)。對由于 SF6 氣體本身原因引起的絕緣故障做出有效應(yīng)對，進(jìn)而保證電網(wǎng)的運(yùn)行安全。所測模擬量送入 PIC16F877單片機(jī)，通過 A/D轉(zhuǎn)換,數(shù)據(jù)分析，實施數(shù)據(jù)越限報警，并用 LCD顯示溫度、壓力以及濕度。數(shù)據(jù)包通過 MBUS總線送入上位機(jī)，進(jìn)行計算機(jī)實時監(jiān)控。 MBUS bus。目 錄蘭州理工大學(xué)畢業(yè)設(shè)計說明書III摘 要 ..................................................................IABSTRACT.................................................................II第一章 緒 論 ..........................................................1 景...............................................................1（研究）內(nèi) 容 ..................................................3.......................................................3.........................................................3第二章 系統(tǒng)總體結(jié)構(gòu)方案設(shè)計 ..............................................5...................................................5...............................................................5...............................................................5...............................................................6...............................................................7.............................................................7第三章 系統(tǒng)的硬件設(shè)計 ...................................................10................................................................10 PIC16F877單片機(jī)特點................................................10............................................................11............................................................12....................................................12 溫度傳感器接口電路 .................................................14 小結(jié) ...............................................................14............................................................14....................................................15 接口電路 ...........................................................16 小結(jié) ...............................................................18............................................................18....................................................18 接口電路 ...........................................................19 小結(jié) ...............................................................19..............................................................19..............................................................20 LCD顯示模塊 ..........................................................20 LCD顯示模塊的選型..................................................21 接口電路 ...........................................................21蘭州理工大學(xué)畢業(yè)設(shè)計說明書IV 小結(jié) ...............................................................21..........................................................22......................................................22.........................................................22.......................................................23...................................................24 TSS721A芯片介紹...................................................25 TSS721A芯片與單片機(jī)接口電路設(shè)計...................................27...............................................................29...........................................................29...........................................................29 接線電路 ..........................................................30...................................................31...............................................................31第四章 軟件設(shè)計 .........................................................33....................................................33......................................................33 ......................................................33 AD轉(zhuǎn)換子程序.......................................................36 LCD顯示子程序......................................................37 中斷服務(wù)子程序 .....................................................39 鍵盤子程序 .........................................................40 解除報警子程 .......................................................41 串行通信子程序 .....................................................41第五章 總 結(jié) ...........................................................47......................................47....................................................47參考文獻(xiàn) .................................................................48英文原文及翻譯 ...........................................................49原文 .....................................................................49翻譯 .....................................................................57致 謝 .................................................................63附錄 .....................................................................64程序清單 .................................................................64蘭州理工大學(xué)畢業(yè)設(shè)計說明書V蘭州理工大學(xué)畢業(yè)設(shè)計說明書1第一章 緒 論目前，社會對電力的需求越來越大。由于 SF6氣體具有優(yōu)良的絕緣、滅弧性能以及 SF6氣體在絕緣組合電器中所體現(xiàn)出的優(yōu)越性，近 30年間 SF6氣體在高壓電氣設(shè)備中的應(yīng)用取得了驚人的進(jìn)展。如產(chǎn)生毒性化合物，對設(shè)備的絕緣產(chǎn)生危害，降低開關(guān)的機(jī)械性能等。其中現(xiàn)場的數(shù)據(jù)采集和具體任務(wù)的執(zhí)行是由單片機(jī)來實現(xiàn)的，而現(xiàn)場和控制計算機(jī)之間的通信則借助于 MBUS總線實現(xiàn)，在軟件通信技術(shù)的支持下完成信息的交換。 選題背景　　SF 6 氣體具有優(yōu)良的絕緣性能,用作許多高壓電氣設(shè)備的絕緣介質(zhì)。 另一方面,由于水分凝結(jié), 濕潤絕緣表面, 將使其絕緣強(qiáng)度下降,威脅運(yùn)行安全。SF6斷路器具有斷口電壓高、開斷能力、允許連續(xù)開斷的次數(shù)較多，噪聲低和無火花危險，而且斷路器尺寸小、重