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750c12tce2gk
發(fā)布者:fzjfx0001  發(fā)布時(shí)間:2019-08-16 21:06:30

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作為火電廠安全經(jīng)濟(jì)運(yùn)行主導(dǎo)因素的熱控自動(dòng)化設(shè)備DCS系統(tǒng),近年來得到了普遍應(yīng)用,為火電廠機(jī)組安全、穩(wěn)定的運(yùn)行起到了積極的作用。但是,DCS系統(tǒng)的安全性和可靠性還有待提高,在運(yùn)行過程中經(jīng)常會(huì)出現(xiàn)這樣或那樣的故障,這些故障的出現(xiàn),導(dǎo)致了發(fā)電機(jī)組的非計(jì)劃停運(yùn),給發(fā)電企業(yè)造成不應(yīng)有的損失。
  1、DCS系統(tǒng)常見的故障
  隨著工業(yè)生產(chǎn)自動(dòng)化的不斷興起、過程控制要求的日益復(fù)雜,一種綜合控制系統(tǒng)――DCS系統(tǒng)應(yīng)用而生了。由于目前各火電廠對DCS系統(tǒng)的應(yīng)用水平的限制,系統(tǒng)在運(yùn)行過程中難免會(huì)出現(xiàn)故障。常見的DCS系統(tǒng)故障有:電源系統(tǒng)故障、硬件(模件)故障、系統(tǒng)軟件故障和通信網(wǎng)絡(luò)系統(tǒng)故障。
  1.1電源系統(tǒng)故障
  電源故障是DCS系統(tǒng)的致命故障,一旦電源出現(xiàn)故障,不僅整個(gè)系統(tǒng)會(huì)停止運(yùn)行,而且還會(huì)導(dǎo)致機(jī)組的跳閘,造成非計(jì)劃停運(yùn)。
  1.1.1電源系統(tǒng)出現(xiàn)故障的主要原因
  電源方面的問題比較多,一是備用電源不能自投,雖采用UPS和APS雙路互為備用的供電方式,但在轉(zhuǎn)換時(shí)也會(huì)出現(xiàn)瞬間失電,導(dǎo)致機(jī)組跳閘;二是保險(xiǎn)配置不合理及DPU電源內(nèi)部故障等造成電源中斷,導(dǎo)致系統(tǒng)運(yùn)行的停止;三是穩(wěn)壓電源波動(dòng)引起保護(hù)誤動(dòng)及接插頭接觸不良導(dǎo)致穩(wěn)壓電源無輸出;四是有的系統(tǒng)整個(gè)機(jī)柜通過一路保險(xiǎn)供所有輸入信號或一路電源外接負(fù)載很大,導(dǎo)致模件的損壞;五是系統(tǒng)電源未采用UPS供電,冗余備用就更無從談起。
  1.1.2電源系統(tǒng)故障應(yīng)采取的防范措施
  要保證DCS系統(tǒng)的安全、穩(wěn)定,首先要具備合理的電源布置,其次要選用高質(zhì)量的電源模塊,并要保證較高的冗余率。再次是注意觀察電源的輸出電壓,防止出現(xiàn)波動(dòng)。第四是對電源實(shí)行壽命管理,該更換的時(shí)候必須更換,絕對不允許等到電源出現(xiàn)了故障的時(shí)候才更換。
  1.2硬件(模件)故障
  DCS系統(tǒng)的硬件(模件)卡件可分為處理器模件、I/O模件及通訊模件三大部分,這三大模件的功能各自不同,常見的故障部位為過程通道和人機(jī)接口。
  1.2.1硬件(模件)出現(xiàn)故障的主要原因
 ?、龠^程通道故障也就是I/O卡件故障。引起I/O卡件發(fā)生故障的第一方面的原因是卡件因長時(shí)間工作而出現(xiàn)老化和損壞,這種工作的發(fā)生,一般是隱藏性的,只有參數(shù)出現(xiàn)異常,系統(tǒng)才會(huì)報(bào)警;第二個(gè)方面是連接線松動(dòng)導(dǎo)致部分I/O模件與主機(jī)的通信中斷,在這種情況下,系統(tǒng)會(huì)馬上做出反應(yīng),出現(xiàn)報(bào)警;第三個(gè)方面是外界強(qiáng)電信號竄入形成干擾而導(dǎo)致通道故障的發(fā)生。
 ?、谥T如球標(biāo)和控制操作出現(xiàn)失靈和實(shí)效以及操作員站出現(xiàn)死機(jī)、鍵盤和打印機(jī)出現(xiàn)工作不正常的現(xiàn)象都屬于人機(jī)接口故障。
  球標(biāo)操作失靈的原因有裝置因長時(shí)間工作發(fā)生老化或者被浮塵或油膩污染,致使觸點(diǎn)不能實(shí)現(xiàn)自行通斷,也或是電纜插頭接觸不良造成與主機(jī)的通信斷路。
  控制操作實(shí)效的主要原因是因球標(biāo)的操作信號不能改變過程通道的狀態(tài),有三種可能:其一可能是過程通道硬件發(fā)生故障;其二可能是操作員站所用軟件的缺陷;其三是設(shè)備超負(fù)荷或者過多地打開窗口,導(dǎo)致不響應(yīng)。
  操作員站死機(jī)的原因基本與控制操作失效的原因相同。
  鍵盤工作不正常的原因有:鍵盤組態(tài)出現(xiàn)錯(cuò)誤、接觸不良、連接電纜松動(dòng)或者在啟動(dòng)主機(jī)時(shí)誤動(dòng)了鍵盤,造成啟動(dòng)缺失。
  打印機(jī)出現(xiàn)工作不正常的原因:或者是配置不合理,或者是因?qū)Υ蛴C(jī)實(shí)施屏蔽而造成的。

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