1755-N2
1755-N2
1755-N2
寶鋼二期燒結工程主排風機設備1991年投入運行。主排風係統由2臺21000m3 /min風量，1 7 . 6 4 k Pa (1800mmWG)靜壓差的雙入離心式風機機組組成，主拖動電機為 2×7800kW，10kV無刷勵磁同步電動機，2臺電機共用一套3.4MVA變頻軟起動裝置起動。該裝置1991年投產以來，故障較多，啟動成功率低。其主要原因是裝置設計容量偏小，係統老化，參數漂移。隨著寶鋼生產節奏的進一步加快，對燒結礦生產的要求越來越高，為確保燒結生產的穩定運行，基於2DL主排風機起動裝置及勵磁裝置的實際現狀，對其進行整體改造的確勢在必行。
二、改造範圍簡述
本改造項目不涉及主排風機本體及油泵、風門等輔機設備。對目前使用狀況尚好的為輔機及輔助設備供電、控制服務的MCC櫃以及關聯二燒結主控制係統的遠程I/O櫃予以保留利用。
對於10kV的高壓開關，保留，能源部設置的輔助繼電器、原有中繼端子櫃也予以保留。
高壓變頻裝置、勵磁櫃、操作控櫃擬引進設備，對其進行整體更換。與變頻裝置配套的輸入、輸出變壓器則由外商提供詳細技術參數及制造要求，由寶鋼方面擇優從內制造廠訂貨，變壓器採用油浸式變壓器。
考慮到本改造項目新上一套主排風機起動裝置及勵磁係統，而且在新係統安裝調試好以前，老係統還要能運行使用，要求新係統電機空載或帶風機負荷調試只能利用2DL年修的七天左右時間完成。當新係統調試過程中出現問題，不能如期接班時，還需老係統作為後備，維持2DL的正常生產。
新起動係統10kV運行總線的兩路旁路開關到二臺同步電動機的饋電，接至老係統運行總線下的兩路旁路開關，主排風機室電動機那段電纜仍用舊有電纜。新老係統試車或運行需重接高壓櫃的高壓電纜進行相互切換。
原有老係統的勵磁櫃、操作控盤拆除後，不再恢復。而新裝的本次引進係統之勵磁櫃及操作、控制、視盤將要兼顧新老係統，這部分設備做成與新老係統兼容且具雙向切換功能。
裝置特點
本高壓變頻器作為軟起動器可以連續起動，起動時間小於200秒，起動電流不超過電機的額定電流。該產品特點為：
可靠性高。該產品採用6500V,1500A 的高壓SGCT器件，器件數量少，耐壓及電流裕量大，變頻電流小，器件開關損耗少，設備可靠。
輸入波形好。變頻整流器採用多脈衝形式(18脈衝)，總體諧波畸變THD小於 5%，直接滿足IEEE519-1992及標的諧波標準。
輸出波形好。無需增加任何選項， PWM電流型變頻器直接輸出完正弦波形，不存在轉矩脈動，無潛在共振問題。逆變時無dv/dt及di/dt的產生，諧波畸變THD小於5%，連接變頻器及電機之間的距離可長達15km。
起動性能好。PowerFlex7000採用直接矢量控制技術，本方案選用無編碼器的矢量控制，轉子的位置可直接檢測，起動力矩為95%額定起動轉矩。
使用簡單。人機接口為大屏幕液晶顯示操作員終端。變頻器的狀態，輸入輸出變量，自診斷結果，故障報等信息均可顯示在屏幕上。
維護方便。高集成度的SGCT器件及 PowerCage機架的使用提高了係統模塊化程度，從而保證了功率模塊的更換時間小於5分鐘。
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