調(diào)容式自動(dòng)消弧裝置的研究

1、論文題目：調(diào)容式自動(dòng)消弧裝置的研究專業(yè)：電力系統(tǒng)及其自動(dòng)化碩士生：張秋艷（簽名））指導(dǎo)教師：付周興（簽名））摘要單相接地故障是電力系統(tǒng)中最主要的故障形式，占據(jù)到故障總數(shù)的70％以上。小電流接地系統(tǒng)發(fā)生單相接地故障時(shí)，短路電流小，三相線電壓依然對(duì)稱，不影響負(fù)載的正常工作，可以繼續(xù)運(yùn)行一定時(shí)間，但是在發(fā)生單相接地后，非接地相對(duì)地的電壓會(huì)升高，間隙性電弧接地還會(huì)產(chǎn)生弧光過(guò)電壓，長(zhǎng)期運(yùn)行可能會(huì)損壞其絕緣，引發(fā)嚴(yán)重的相間故障。所以，在系統(tǒng)出現(xiàn)單相

2、接地故障后，應(yīng)立即找出故障線路，設(shè)法使接地設(shè)備從系統(tǒng)中切除。電網(wǎng)對(duì)地分布電容的存在是接地點(diǎn)產(chǎn)生故障電流的主要原因，在電網(wǎng)的中性點(diǎn)與大地之間加裝消弧線圈，可使容性電流得到補(bǔ)償，從而使接地點(diǎn)的電流減小。特別是消弧線圈跟蹤補(bǔ)償，根據(jù)實(shí)際電網(wǎng)電容電流的大小，自動(dòng)調(diào)節(jié)消弧線圈產(chǎn)生的感性電流，使兩者處于平衡狀態(tài)，從而使接地電流減小為量值很小的有功電流，使電弧不能維持、自動(dòng)熄滅。跟蹤補(bǔ)償能使瞬時(shí)性接地故障自動(dòng)消除，也能使永久性接地故障的危害程度大為降

3、低，是減小故障損失的主要技術(shù)措施。首先分析了調(diào)容式消弧線圈本體的阻抗變換及調(diào)諧原理，并對(duì)電容電流在線測(cè)量和單相接地故障自動(dòng)識(shí)別兩個(gè)難點(diǎn)問(wèn)題進(jìn)行了分析，提出了采用消弧線圈自動(dòng)調(diào)諧實(shí)現(xiàn)準(zhǔn)確識(shí)別單相接地故障；其次基于matlab仿真軟件進(jìn)行了消弧線圈的阻抗變換及系統(tǒng)接地補(bǔ)償分析，特別的驗(yàn)證了系統(tǒng)正常情況下系統(tǒng)電容電流的在線測(cè)量及基于TSC投切電流的仿真。再次，根據(jù)系統(tǒng)要求，詳細(xì)設(shè)計(jì)了系統(tǒng)的硬件設(shè)計(jì)電路；最后，給出了系統(tǒng)的軟件流程。關(guān)鍵字：消弧

4、線圈；自動(dòng)調(diào)諧；雙向可控硅投切電容器；自動(dòng)跟蹤消弧補(bǔ)償研究類型：應(yīng)用研究萬(wàn)方數(shù)據(jù)Subject:ResearchofArcSuppressionDeviceAutomaticFaultLineionSpecialty:PowerSystemAutomationName:ZhangQiuYan(Signature))Instruct:FuZhouXing(Signature))ABSTRACTSinglephasetoearthfault

5、isthemostfrequentlyhappenedfaultfminpowersystemTheprobabilityisupto70percentsinallfmsoffaults。Thefaultcurrentissmallthethreephaselinetofinevoltagesarestillsymmetricwhilesinglephasetoearthfaultoccursinanonsolidlyearthedwk

6、theloadcanbeinnmalprocessfaperiodoftimeButafterthefault，theno—faultedphasevoltagewouldincreaseintermittentarcgroundingwouldleadarcovervoltage，sotheinsulationwouldbedamagedinlongtimerunningleadingmeseriousphasetophasevolt

7、agefaultSosinglephasetoearthfaultshouldberemovedassoonaspossiblethefaultlineshouldbefoundimmediatelyFthedistributedcapacitanceofthewkisthemaincauseofthefaultcurrent，itcanbecompensatedreducedbyinstallingarcsuppressioncoil

8、()Especiallytotheisautotuning，thecapacitivecurrentofthepowersystemcanbetotallycompensatedbyautomaticallyregulating’sinductivecurrentUsingthefunctionoftrackingcompensationthefaultcurrentcouldbereducedtoasmallactivecurrent

9、thearccan’tmaintainwillgooutsoonTrackingcompensationwhichcouldremovethetransientgroundingfaultautomaticallygreatlyreducethedamageofthepermanentgroundingfaultisakindofchieftechnicalmeasurestoreducethelosscausedbygroundfau

10、ltFirstlytheprincipleofimpedanceconversiontuningtunecontainedPetersencoilbodycapacitivecurrentonlinemeasurementautomaticidentificationofsinglephasegroundfaulttwodifficultproblemswereanalyzedtheuseofarcsuppressioncoilauto

11、matictuningtoachieveaccurateidentificationofsinglephasetogroundfaultsecondlymatlabbasedsimulationsoftwaresystemgroundingimpedancetransfmationcompensationArcanalysisparticularlytoverifythemeasurementsystemundernmalcircums