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SCONINC變換器SCONI-1000L-227Y,出售云永WYZS-102HDAEYEON轉(zhuǎn)換器;DY-LSC-11AAY DY-LSC-12AAY DY-LSC-13AAY DY-LSC-14AAY DY-LSC-15AAY DY-LSC-16AAY
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退磁檢查電流互感器在電流突然下降的情況下，互感器鐵芯可能產(chǎn)生剩磁。如電流互感器在大電流情況下突然切斷電源、二次繞組突然開路等?；ジ衅麒F芯有剩磁，使鐵芯磁導(dǎo)率下降，影響互感器性能。長期使用后的互感器都應(yīng)該退磁?；ジ衅鳈z驗前也要退磁。退磁就是通過一次或二次繞組以交變的勵磁電流，給鐵芯以交變的磁場。從0開始逐漸加大交變的磁場(勵磁電流)使鐵芯達到飽和狀態(tài)，然后再慢慢減小勵磁電零，以剩磁。對于電流互感器退磁，一次繞組開路，二次繞組通以工頻電流，從零開始逐漸到一定的電流值(該電流值與互感器的設(shè)計測量上限有關(guān)，一般為額定電流的20-50%左右?？梢噪娏骰ジ衅麟娏骰ジ衅鬟@樣判斷，如果電流突然急劇變大。

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軟啟動器是一種集軟啟動、軟停車、輕載節(jié)能和多功能保護于一體的電機控制裝備。實現(xiàn)在整個啟動中無沖擊而的啟動電機，而且可根據(jù)電動機負載的特性來調(diào)節(jié)啟動中的各種參數(shù)，如限流值、啟動時間等。中文名軟啟動器外文名Softstarter作用實現(xiàn)整個啟動中無沖擊而功能軟啟動、軟停車、輕載節(jié)能目錄1歷史沿革2發(fā)展趨勢3主要分類4相關(guān)原理?工作原理?啟動?節(jié)能原理?運行?控制原理5功能特點?主要功能?主要應(yīng)用?主要特點?性能特點6產(chǎn)品區(qū)別7維修檢查歷史沿革編輯軟啟動器于20世紀70年代末和80年代初投入市場，軟啟動器（圖7）軟啟動器（圖7）填補了星-三角啟動器和變頻器在功能實用性和價格之間的鴻溝。軟啟動器（圖10）軟啟動器（圖10）軟啟動器從本質(zhì)上是一種能夠自動控制的降壓啟動器，由于能夠任意調(diào)節(jié)輸出電壓，作電流閉環(huán)控制，因而比的降壓啟動（如串電阻啟動，自耦變壓器啟動等）有更多優(yōu)點。例如滿載啟動風機水泵等變轉(zhuǎn)矩負載、實現(xiàn)電機軟停止、應(yīng)用于水泵能完全水錘效應(yīng)等。功能特點編輯主要功能過載保護功能：軟起動器引進了電流控制環(huán)，軟啟動器（圖11）軟啟動器（圖11）因而隨時跟蹤檢測電機電流的變化狀況。通過過載電流的設(shè)定和反時限控制，實現(xiàn)了過載保護功能，使電機過載時，關(guān)斷晶閘管并發(fā)出。缺相保護功能：工作時，軟起動器隨時檢測三相線電流的變化，一旦發(fā)生斷流，即可作出缺相保護反應(yīng)。