57C404B
57C404B
57C404B
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此方案最適宜用于改造項目,優(yōu)點:(1)方案成熟。僅以西門子的產(chǎn)品為例,目前已在國內(nèi)應(yīng)用的套數(shù)已出具規(guī)模。(2)原有的電機電纜無須進行改動。(3)便于實現(xiàn)切換的功能。(4)相比于高―高方案的投資較低。其缺點:系統(tǒng)構(gòu)成環(huán)節(jié)相對高―低或者高―高方案較多,因為濾波器以及升壓、降壓變壓器的損耗,長期的運行費用也就相對較高。
2.2 高―低―低方案
高―低―低方案的核心仍然是以低壓變頻器為主,在變頻器的輸入側(cè)加裝一臺雙繞組的降壓變壓器,把高壓電機變成可用的低壓變頻驅(qū)動的電壓等級。此方案目前在國內(nèi)的用戶較多。
此方案的優(yōu)點在于:(1)方案成熟。低壓IGBT或者IGCT功率器件已經(jīng)很成熟,應(yīng)用范圍也很廣。(2)構(gòu)成簡單,維護的環(huán)節(jié)少。(3)投資少,見效快。低壓變頻器的價格低廉,市場價格相當透明。(4)升壓變壓器的損耗、長期運行的費用低。此方案的缺點:當用于改造項目時,需要更換電機,增加改造的工作量,從而也使得項目投資增加,延長施工周期。
2.3 高―高方案
高―高變頻器是高壓電源經(jīng)過高壓開關(guān)柜后,直接送至高壓變頻器,經(jīng)高壓變頻后,直接將電壓供給給高壓電動機的定子。
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【價格】如此低價,僅此一家
【貨期】大量現(xiàn)貨,下單后即可發(fā)貨
【質(zhì)量】全新原裝,進口***
【保障】產(chǎn)品經(jīng)過專業(yè)檢測，質(zhì)保一年,15天包退換
【品牌】Allen-Bradley羅克韋爾、ABB、本特利Bently 3500系統(tǒng)卡件、GE、艾默生西屋等模塊卡件
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西門子產(chǎn)品的應(yīng)用較多,系統(tǒng)主要由雙繞組降壓變頻器、變壓器組成,此系統(tǒng)方案構(gòu)成較簡單,特別適用于新建項目,對于改造的項目,更換電機就會增加項目的開支。其諧波分量主要為5、7、11、13、17、19、19、23、25次。
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