DR-120-24
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電力系統(tǒng)中的直流電源部分由蓄電池組、充電設(shè)備、直流屏等設(shè)備組成。它的作用是:正常時(shí)為變電站內(nèi)的斷路器提供合閘直流電源;故障時(shí),當(dāng)廠、站用電中斷的情況下為繼電保護(hù)及自動(dòng)裝置、斷路器跳閘與合閘、載波通訊、發(fā)電廠直流電動(dòng)機(jī)拖動(dòng)的廠用機(jī)械提供工作直流電源。它的正常與否直接影響電力系統(tǒng)的安全可靠運(yùn)行。
過往,電力系統(tǒng)的各個(gè)變電站都有人值守,可以對(duì)直流設(shè)備的運(yùn)行狀態(tài)進(jìn)行定期檢查,因而可以及時(shí)發(fā)現(xiàn)并處理其出現(xiàn)的異?,F(xiàn)象,保證變電站的安全穩(wěn)定運(yùn)行。目前,電力系統(tǒng)推廣無人值班變電站,固然調(diào)度中心可以通過遠(yuǎn)動(dòng)通道獲取變電站運(yùn)行情況的實(shí)時(shí)信息,但是對(duì)于直流部分只能得到少量的重要信息,它不能反映直流系統(tǒng)運(yùn)行的具體信息,特別是它不能發(fā)現(xiàn)系統(tǒng)剛剛開始出現(xiàn)異常運(yùn)行的情況,直到*的異常運(yùn)行發(fā)展為故障時(shí)才上發(fā)調(diào)度,此時(shí),事故已經(jīng)擴(kuò)大。假如能在異?,F(xiàn)象剛出現(xiàn)時(shí)就及時(shí)發(fā)現(xiàn)并及時(shí)處理,就可以避免異常情況擴(kuò)大。所以DR-120-24 需要設(shè)備維護(hù)職員對(duì)其進(jìn)行定期檢查。此外,對(duì)直流設(shè)備 運(yùn)行的控制也是由維護(hù)職員進(jìn)行現(xiàn)場(chǎng)操縱的。變電站,維護(hù)職員少,顯然無法保證定期按量完成。在這種情況下,直流監(jiān)控系統(tǒng)應(yīng)運(yùn)而生。它的主要作用就是把各變電站的直流設(shè)備信息上送到監(jiān)控中心,供其查詢,同時(shí)監(jiān)控中心也可以向各站發(fā)送控制命令,必要時(shí)候,直流監(jiān)控系統(tǒng)能夠?qū)?bào)警信息通過GPRS信息方式及時(shí)通知維護(hù)職員。這樣,維護(hù)職員不但可以在監(jiān)控中心對(duì)直流設(shè)備進(jìn)行遠(yuǎn)方監(jiān)控,還可以及時(shí)發(fā)現(xiàn)設(shè)備運(yùn)行的不正常狀態(tài),及時(shí)處理,而不等其發(fā)展演變成事故。所以,直流監(jiān)控系統(tǒng)的建立,可以節(jié)省人力物力,進(jìn)步工作效率。
目前,變電站上送調(diào)度中心的各種信息,如遠(yuǎn)測(cè)、遠(yuǎn)信、遠(yuǎn)控、主要設(shè)備狀態(tài)和報(bào)警信息等,都是通過遠(yuǎn)動(dòng)通道傳輸?shù)?,這些信息對(duì)實(shí)時(shí)性的要求很高,不??雌渌畔⒄加枚雇ǖ罁頂D,影響調(diào)度的正常工作。所以直流設(shè)備的運(yùn)行信息必須從另一個(gè)通道進(jìn)行遠(yuǎn)方傳送。由于直流系統(tǒng)信息量量少,發(fā)送時(shí)占用通道時(shí)間短等特點(diǎn),可是用無線GSM或GPRS的通訊方式將直流系統(tǒng)當(dāng)前的遠(yuǎn)測(cè)、遠(yuǎn)信、遠(yuǎn)控、遠(yuǎn)調(diào)量報(bào)警信息等發(fā)送到中心調(diào)度中心。
對(duì)于沒有開通無線數(shù)據(jù)業(yè)務(wù)或偏僻地區(qū),用戶也可以通過PSDN或ADSL通訊網(wǎng)絡(luò)與中心調(diào)度中心進(jìn)行通訊連接,可以組成實(shí)時(shí)的監(jiān)控系統(tǒng)。
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