AD908AC電纜
現(xiàn)有接線方式無法滿足與新建的一套電量采集終端通信,因此,必須進行技術(shù)改造,以滿足電度表表碼上傳的技術(shù)要求。在安裝方案中,主要考慮了以下方案:
將新安裝電量采集終端(如CHL064-5c電能量采集終端)的RS485通信口與iES—E50電能量遠方終端的RS485并接,采用偵聽模式與發(fā)電機出線電度表、總降進線電度表等通信,該新安裝電量采集終端不主動詢問從站,只在從站向主站iES—E50電能量遠方終端發(fā)送數(shù)據(jù)時接收數(shù)據(jù)。此方式涉及新購買電能量采集終端(如CHL064-5c)。
AD908AC電纜新安裝電量采集終端直接與所有電度表通信,而原有iES—E50電能量遠方終端改為只與新安裝電量采集終端通過RS485通信。這種方式同第一種,也需要新購買電能量采集終端,而且由于通信規(guī)約的改變增加了調(diào)試費用。
三、探索利用現(xiàn)有iES—E50電能量遠方終端上傳電量數(shù)據(jù)的可行性。
iES-E50電能量遠方終端主要完成電能量數(shù)據(jù)的采集、預(yù)處理和存儲,并通過多種通信線路將數(shù)據(jù)傳送到主站。對于不同類型的智能電能表,終端通過調(diào)用相應(yīng)的電表規(guī)約實現(xiàn)數(shù)據(jù)的讀取,并對接收到的數(shù)據(jù)進行處理后帶時標存儲,定時或根據(jù)主站召喚發(fā)送到主站系統(tǒng);對于脈沖電能表,終端首先對脈沖表的輸出脈沖進行隔離、脈沖整形等處理,然后根據(jù)預(yù)先設(shè)置的電表參數(shù)將接收的脈沖數(shù)據(jù)轉(zhuǎn)換成電度數(shù)據(jù),再進行必要的處理后帶時標存儲,最后傳送給主站系統(tǒng)LED是具有二極管特性的發(fā)光管,它只能單方向通電。通常LED亮度輸出與通過LED電流成正比,但白光LED在大電流下會出現(xiàn)飽和現(xiàn)象,發(fā)光效率大幅度降低,甚至失效,因此LED使用電流不能超過其規(guī)格額定值。另外,LED亮度輸出與溫度成反比,所以使用中應(yīng)盡量減少電源發(fā)熱和設(shè)計良好的散熱系統(tǒng)。功率因素是電網(wǎng)對負載的要求。一般70瓦以下的用電器,沒有強制性指標。雖然功率不大的單個用電器功率因素低一點對電網(wǎng)的影響不大,但晚上大家點燈,同類負載太集中,會對電網(wǎng)產(chǎn)生較嚴重的污染。對于30瓦~40瓦的LED驅(qū)動電源,據(jù)說不久的將來,也許會對功率因素方面有一定的指標要求?,F(xiàn)在通行的有兩種:其一是一個恒壓源供多個恒流源,每個恒流源單獨給每路LED供電。i/o in the electrical building, and 1 i/o is distributed in the ground mine substation, phase I substation, the factory electrical building and the duty room of the raw ore 2# pump station respectively. Optical fiber networking is adopted between master station and slave station. (see Figure 1 below for details) system requirements: the system is Schneider Kunteng series PLC (master station cpu140cpu67160, master station adapter 140crp93200, slave station adapter 140cra93200), remote i/o network technology based on s908. Rio uses coaxial cable to bind lines. The system is required to be s908 dual network redundancy, and optical fiber networking is used between master station and slave station. For the convenience of future station expansion, the optical fiber relay module is uniformly selected as the same model. Model and quantity of equipment used: model:ci-rf120-m quantity: 16 product function introduction: * the product complies with s908 Rio bus standard, with a rate of 1.544mbps* The data interface adopts f coaxial interface, which is compatible with the interface form of imported products * multimode optical fiber 2km, single-mode optical fiber 20km, effectively extending the transmission