MM-PM15-414
MM-PM15-414
MM-PM15-414
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)終端探測器負責監(jiān)測各個回路的剩余電流值，將剩余電流值的數(shù)據(jù)傳輸至系統(tǒng)主機。終端探測器還負責其監(jiān)測回路剩余電流值的實時顯示，同時能夠設置限值，當剩余電流值越限時能夠發(fā)出聲光報警，提醒管理人員及時維護、整改。
3)儀表通過RS485總線將數(shù)據(jù)傳輸至系統(tǒng)主機，系統(tǒng)主機將上傳數(shù)據(jù)通過圖形、報表、事件記錄等形式反映整個系統(tǒng)的運行狀態(tài)。
5 系統(tǒng)設計注意事項和方法
5.1 電氣火災監(jiān)控系統(tǒng)主要監(jiān)測剩余電流和溫度兩類對象，在設計時應注意的基本要點
1)關于剩余電流
由于剩余電流監(jiān)測的原理采用了基爾霍夫電流定律，所以，對所應用的低壓配電系統(tǒng)形式有一定要求。目前，可以應用剩余電流互感器的低壓配電系統(tǒng)有：TT系統(tǒng)，IT系統(tǒng)，TN-S系統(tǒng)，不能使用在TN-C系統(tǒng)中。對將要設計安裝電氣火災監(jiān)控系統(tǒng)的用戶，不管是新工程或舊工程改造項目，首先要調查核實該用戶低壓配電系統(tǒng)的系統(tǒng)接地形式是什么，否則，設計安裝剩余電流互感器的點位進行檢測是根本無法施行的。
關于AC220V單相供電系統(tǒng)，剩余電流互感器只要套住L/N兩根電源線即可，但要求中性線N此后不容許再接地。對于AC380V三相供電系統(tǒng)，由于有三相三線制、三相四線制、三相五線制等使用狀況，則根據(jù)具體情況將剩余電流互感器同時套住A/B/C三相電源線，或同時套住A/B/C/N線。同理，要求中性線N此后不許再接地，保護線PE不得穿過互感器。
在系統(tǒng)接地的形式為TN-C型時工業(yè)自動化網(wǎng)，必須將其改造為TN-S型、TN-C-S型或局部TT型系統(tǒng)后，才可以安裝剩余電流檢測裝置。
2)關于溫度
溫度測量與系統(tǒng)接地的形式無關，主要考慮包括線纜在內的低壓配電裝置中關鍵部位的溫度，一般在二級保護的線路中應用。溫度探頭Pt100可采用接觸式布置法，當被檢測對象為絕緣體時，宜將探測器的溫度傳感器直接設置在被探測對象的表面。當被檢測對象為配電柜內部溫度變化時，可采用非接觸式布置，靠近發(fā)熱部件。
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