6ES75050RB000AB0
6ES75050RB000AB0
6ES75050RB000AB0
6ES75050RB000AB0
6ES75050RB000AB0
這種類型的RTU裝置在采集模擬量之前，先利用變送器將交流轉(zhuǎn)化成直流，然后再使用RTUA／D轉(zhuǎn)換元件將直流量表示成數(shù)字量。其裝置以模擬電路為主，輔以少量的數(shù)字電路。其特點(diǎn)在于需要變換器，無需高級(jí)的數(shù)字處理單元（CPU等），難以反映模擬量的瞬時(shí)變化，無法進(jìn)行諧波分析，電能量總加功能的實(shí)現(xiàn)比較復(fù)雜困難。
b）交流采樣方案
這種類型的RTU裝置直接使用A／D轉(zhuǎn)換元件對交流電量進(jìn)行采集計(jì)算，無需變送器之類的轉(zhuǎn)換設(shè)備，但需要快速的數(shù)字處理單元進(jìn)行配合，以對采集到的數(shù)據(jù)進(jìn)行分析、綜合。它不僅可以反映電量的瞬時(shí)變化，而且可以進(jìn)行諧波分析，計(jì)算頻率，簡單地實(shí)現(xiàn)電能量總加功能。它們多使用微型計(jì)算機(jī)（如8 X86等）配合多個(gè)單片機(jī)（如8051、8098等）、并加上大量的A／D轉(zhuǎn)換電路，來實(shí)現(xiàn)開關(guān)量、模擬量的采集。
當(dāng)前在數(shù)字技術(shù)得到充分發(fā)展和應(yīng)用的情況下，交流采樣方案是配網(wǎng)自動(dòng)化的一個(gè)合理選擇。它以數(shù)字電路為主，輔以少量的模擬電路，功能強(qiáng)大，擴(kuò)充容易，可靠性較直流采樣方案有較大提高，綜合成本低。
2．2 中低壓配網(wǎng)自動(dòng)化的應(yīng)用特點(diǎn)
中低壓配網(wǎng)自動(dòng)化系統(tǒng)由主站、遠(yuǎn)方終端單元（RTU）、線路傳感器、遠(yuǎn)方控制SF6 或真空開關(guān)、通信電纜等五個(gè)部分組成。中低壓配電網(wǎng)自動(dòng)化的應(yīng)用有自己不同的特點(diǎn)：
a）傳統(tǒng)的變電站RTU在功能上偏重遙信、遙測，但中低壓配電網(wǎng)的自動(dòng)化對象（開關(guān)房、開閉所和配電房）數(shù)目繁多，開關(guān)操作頻繁，更注重遙信、遙控功能。
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