6ES75070RA000AB0
6ES75070RA000AB0
6ES75070RA000AB0
6ES75070RA000AB0
6ES75070RA000AB0
b）中低壓配電網(wǎng)的自動(dòng)化對(duì)象遍布城市、農(nóng)村等各種不同環(huán)境，被不同層次的用電管理人員（包括農(nóng)村電工）所操作。更要求其具有安裝靈活、易操作、免專業(yè)維護(hù)、抗惡劣環(huán)境等特點(diǎn)。
c）應(yīng)用于中低壓配電網(wǎng)的RTU，在功能上應(yīng)具有模塊化結(jié)構(gòu)，在硬件上要越簡(jiǎn)單、越可靠越好。最好是同一套簡(jiǎn)單硬件，只要簡(jiǎn)單進(jìn)行一下設(shè)置，就可以滿足不同場(chǎng)合、不同規(guī)模的要求。
由此可見(jiàn)，有必要開(kāi)發(fā)新型的、不同于傳統(tǒng)結(jié)構(gòu)的RTU，以適合中低壓配電網(wǎng)自動(dòng)化的特點(diǎn)和需要。
2．3 中低壓配電網(wǎng)自動(dòng)化RTU的PLC實(shí)現(xiàn)
可編程序控制器（programmable logic con－troller，PLC）技術(shù)經(jīng)過(guò)幾十年的發(fā)展，已經(jīng)相當(dāng)成熟。其品種齊全，功能繁多，已被廣泛應(yīng)用于工業(yè)控制的各個(gè)領(lǐng)域。用PLC來(lái)實(shí)現(xiàn)中低壓配電網(wǎng)自動(dòng)化的RTU功能，能夠很好地滿足RTU的特有的要求。在國(guó)內(nèi)市場(chǎng)，有來(lái)自許多著名廠家的PLC產(chǎn)品。這些產(chǎn)品從簡(jiǎn)單到復(fù)雜，都自成系列，可以滿足不同應(yīng)用的特殊要求。大多數(shù)中低檔次的PLC產(chǎn)品，都包含有離散點(diǎn)輸入和輸出（點(diǎn)數(shù)的多少可以依據(jù)應(yīng)用情況增減）、模擬采樣輸入、時(shí)鐘、通信等功能。利用這類PLC的現(xiàn)成功能，可以方便地實(shí)現(xiàn)中低壓配電網(wǎng)自動(dòng)化的 RTU功能。使用PLC的離散輸入點(diǎn)來(lái)實(shí)現(xiàn)遙信、用PLC的離散輸出點(diǎn)來(lái)實(shí)現(xiàn)遙控、用PLC的模擬采樣輸入來(lái)實(shí)現(xiàn)遙測(cè)、用PLC的通信功能來(lái)實(shí)現(xiàn)和主機(jī)的通信。完成這些功能，都無(wú)需額外的硬件，只需根據(jù)開(kāi)關(guān)房的實(shí)際情況，對(duì)PLC進(jìn)行簡(jiǎn)單編程即可。不僅如此，利用PLC的模擬輸出功能，甚至還可以實(shí)現(xiàn)配電網(wǎng)的遙調(diào)。例如調(diào)節(jié)調(diào)壓變壓器的變比，調(diào)節(jié)靜止無(wú)功補(bǔ)償設(shè)備的電壓、電流相角等。
這樣一種基于PLC的中低壓配電網(wǎng)自動(dòng)化的RTU實(shí)現(xiàn)方案，完全可以滿足中低壓配網(wǎng)自動(dòng)化的特殊要求。它具有以下特點(diǎn)和優(yōu)勢(shì)：硬件結(jié)構(gòu)簡(jiǎn)單，完全免維護(hù)；規(guī)?？纱罂尚。恍鑼?PLC的擴(kuò)展模塊連接在一起，就可以實(shí)現(xiàn)遙控點(diǎn)、遙信點(diǎn)、遙測(cè)點(diǎn)的增加；抗惡劣環(huán)境；高可靠性；編程實(shí)現(xiàn)各種功能，免硬件調(diào)試；費(fèi)用低廉。
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