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SP-194933 M-939940-1-1

SP-194933 M-939940-1-1

SP-194933 M-939940-1-1

SP-194933 M-939940-1-1

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【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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隨著電力、電子技術(shù)、計算機技術(shù)的不斷發(fā)展,交流電機變頻技術(shù)得到了日益完善并迅猛的發(fā)展,中小容量的低壓變頻(690V以下)已被廣泛的應(yīng)用。
除節(jié)能降耗外,在機械、造紙、冶金、石化、礦山、建材、電力等領(lǐng)域其已成為必不可少的關(guān)鍵設(shè)備。然而,對于中大容量、高壓交流電機的變頻調(diào)速,除了價格因素之外,合理的改造方案或者設(shè)計方案,以及綜合投資和性價比,也成為了制約其被廣泛推廣應(yīng)用的因素。

  1、高壓電機變頻調(diào)速方案現(xiàn)狀

  高壓大容量的變頻調(diào)速器是一種難度大、技術(shù)含量高的高新技術(shù),其開發(fā)與生產(chǎn)的難度有:因為高壓變頻器的供電電壓高,但是世界上電力電子元器件的耐壓水平較低;高壓大功率變頻器的技術(shù)難度大,制造技術(shù)也要求高。然而它主要被應(yīng)用于風(fēng)機、水泵等的節(jié)能運行,需要低投入,由節(jié)電費用來償還投資。

  2、高壓變頻方案的分類及特點

  2.1 高―低―高方案

  此方案以通用的低壓變頻器為核心,即:在低壓變頻器的輸入側(cè)加入一臺降壓變頻器,把6KV/3KV降至低壓變頻器適配的輸入電壓;在變頻器的輸入側(cè)加入一臺升壓變壓器,從而使得輸出電壓和電動機的額定電壓相匹配。高―低―高的變頻調(diào)速方案,在國內(nèi)市場較為普遍,也是目前應(yīng)用最多的一種,
在市場上主要是以西門子產(chǎn)品為主。在此方案中,按照直流供電整流單元的形式可分為6脈動整流單元與12脈動整流單元。6脈動整流單元的系統(tǒng)結(jié)構(gòu)簡單,硬件構(gòu)成的用費較低;12脈動整流單元卻是由一臺次邊相差30度的三繞組變壓器與兩臺完全相同的整流單元所構(gòu)成的,且在變壓器的二次側(cè)必須接入進線電抗器,因此其相對成本較高,但是,從諧波分量上看,12脈動整流的效果要比6脈動好,6脈動的諧波分量為5、7、11、13、17、19、23、25次,12脈動的諧波分量為11、13、23、25次。

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