SOE的結(jié)論對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SOE事件順序追憶時(shí)間與實(shí)際跳閘時(shí)間不相對應(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問題既與系統(tǒng)設(shè)計(jì)不合理,SOE點(diǎn)沒完全集中在一個(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)可能來自于系統(tǒng)本身,也可能來自于外部環(huán)境。由于不同的系統(tǒng)對接地都有嚴(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),無擾切換至另一路電源,否則會(huì)對系統(tǒng)工作產(chǎn)生干擾。過程控制處理機(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,大功率的無線電通信設(shè)備如手機(jī)、對講機(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常見故障,希望可以幫助更多在DCS維護(hù)方面欠缺的儀表人。
BENTLY NEVADA 72650-30-50-50?-03-01-11 USPP 72650305050030?11
BENTLY NEVADA 72301-01-02-02?-05-01-01 USPP 72301010202050?10
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3500/25 BENTLY NEVADA
BENTLY NEVADA 72489-XX NSPP 72489XX
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BENTLY NEVADA 72751-03-01-15?-00-01-1 USPP 72751030115000?11
BENTLY NEVADA 90192-04 USPP 9019204
81546-01 BENTLY NEVADA
Bently Nevada Dual Vibration XY/GAP Monitor 3300/16
BENTLY NEVADA 72050-01-00 USPP 720500100
BENTLY NEVADA 29528-12-12-12?-12-12-12-12-0?0 USPP 29528121212121?21
Bently Nevada 2201/02-02 System Monitor *GOOD PULL*
Designed for use in A/B 1771 I/O Racks
Bently Nevada 2201/03-03 4-Channel Monitor *GOOD PULL*
Designed for use in A/B 1771 I/O Racks
BENTLY NEVADA 21504-00-24-10?-02 PROBE 2150400241002 NEW
Bently Nevada Velocity Seismoprobe 16699-01-05-03 (5208)
NEW Bently Nevada 7200 Vibration Monitor Meter Rack Ready Card Assembly 72101-04
82366-01 BENTLY NEVADA
BENTLY NEVADA 5086-03-01 USPP 50860301
BENTLY NEVADA 7203789-01 USPP 720378901
BENTLY NEVADA 330100-50-03 USPP 3301005003
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NEW BENTLY NEVADA PROXIMITY PROBE 30000-00-40-36?-02
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