SOE的結(jié)論對(duì)事故的分析判斷起了很重要的作用，但在現(xiàn)實(shí)中，許多電廠發(fā)生保護(hù)動(dòng)作等情況時(shí)SOE未記錄下拉或記錄時(shí)間與實(shí)際情況不符。如電廠#1機(jī)組出現(xiàn)過(guò)SOE事件順序追憶時(shí)間與實(shí)際跳閘時(shí)間不相對(duì)應(yīng)，SOE時(shí)間打印瀏覽后不能返回，首次跳閘原因在時(shí)間順序未能第一個(gè)反應(yīng)，SOE時(shí)間順序數(shù)據(jù)不能設(shè)置等問(wèn)題。而又的電廠在幾次事故分析時(shí)發(fā)現(xiàn)SOE結(jié)論中的時(shí)序與歷史曲線中的時(shí)序有偏差，有時(shí)甚至?xí)r序顛倒，具體表現(xiàn)于同一個(gè)點(diǎn)在歷史曲線和SOE中民生時(shí)間不一致，且有時(shí)偏差很大，這會(huì)延誤事故分析的進(jìn)程，有時(shí)甚至誤導(dǎo)事故分析方向。SOE問(wèn)題既與系統(tǒng)設(shè)計(jì)不合理，SOE點(diǎn)沒(méi)完全集中在一個(gè)上有關(guān)，也與系統(tǒng)硬件及軟件考慮不周有關(guān)。

11、干擾造成的故障

干擾造成的故障的實(shí)例也不少。系統(tǒng)的干擾信號(hào)可能來(lái)自于系統(tǒng)本身，也可能來(lái)自于外部環(huán)境。由于不同的系統(tǒng)對(duì)接地都有嚴(yán)格要求的規(guī)定，一旦接地電阻或接地方式達(dá)不到要求，就會(huì)使網(wǎng)路通信的效率降低或增加誤碼的可能，輕則造成部分功能不正常，重則導(dǎo)致網(wǎng)絡(luò)癱瘓。 電源質(zhì)量同樣影響系統(tǒng)的穩(wěn)定運(yùn)行。用于系統(tǒng)的電源既要保證電壓的穩(wěn)定，也要保證在一路電源故障時(shí)，無(wú)擾切換至另一路電源，否則會(huì)對(duì)系統(tǒng)工作產(chǎn)生干擾。過(guò)程控制處理機(jī)主/備處理機(jī)之間的切換有時(shí)也會(huì)導(dǎo)致干擾。另外，大功率的無(wú)線電通信設(shè)備如手機(jī)、對(duì)講機(jī)等在工作時(shí)，極易造成干擾，危及系統(tǒng)運(yùn)行。

根據(jù)以往的DCS使用檢修維護(hù)管理經(jīng)驗(yàn)，總結(jié)了DCS常見(jiàn)故障，希望可以幫助更多在DCS維護(hù)方面欠缺的儀表人。

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