西門子變頻器變流器整流器備件模塊6SL3355-6TE35-0AA3
西門子變頻器變流器整流器備件模塊6SL3355-6TE35-0AA3
西門子變頻器變流器整流器備件模塊6SL3355-6TE35-0AA3
故障信息及故障特征的提取和處理是電子式過載保護(hù)繼電器實(shí)現(xiàn)電動(dòng)機(jī)保護(hù)的關(guān)鍵所在。由于三相異步電動(dòng)機(jī)在三相對(duì)稱狀態(tài)下的過流與在不對(duì)稱狀態(tài)下的過流(存在反向旋轉(zhuǎn)的負(fù)序磁場(chǎng))燒損電動(dòng)機(jī)存在不同的機(jī)理,從而造成不同程度的危害,因此傳統(tǒng)的以電流幅值作為故障判據(jù)的保護(hù)方式在原理上存在一定的缺陷,它只能反應(yīng)對(duì)稱故障,對(duì)斷相、接地、不平衡運(yùn)行等不對(duì)稱故障不能及時(shí)有效地進(jìn)行保護(hù)。因此,在研究電子式過載保護(hù)繼電器的智能化技術(shù)的過程中,利用以單片機(jī)為核心的電子保護(hù)電路,采用的保護(hù)原理是基于對(duì)稱分量法,以三相異步電動(dòng)機(jī)的電流幅值、電流負(fù)序分量、電流零序分量以及電壓幅值的不同排列組合作為電子式過載保護(hù)繼電器的保護(hù)原理,除實(shí)現(xiàn)過載故障保護(hù)外,同時(shí)可以實(shí)現(xiàn)三相短路、起動(dòng)時(shí)間過長、堵轉(zhuǎn)、不平衡運(yùn)行、斷相、接地和電壓故障等故障保護(hù)。
三相異步電動(dòng)機(jī)對(duì)稱故障的主要特征是三相電流基本對(duì)稱但同時(shí)出現(xiàn)過電流,因此可通過檢測(cè)電流幅值進(jìn)行故障判斷。根據(jù)對(duì)稱分量法分析,負(fù)序分量和零序分量在三相異步電動(dòng)機(jī)正常運(yùn)行時(shí)沒有或很小,一旦出現(xiàn)必然表示發(fā)生了不對(duì)稱故障。不對(duì)稱故障可分為非接地性不對(duì)稱故障和接地性不對(duì)稱故障。非接地性不對(duì)稱故障會(huì)引起三相電流不對(duì)稱,此時(shí)定子電流可分解為正序分量和負(fù)序分量(零序分量為零),因此采用負(fù)序電流分量及各線電流的情況作為此類故障的判據(jù);接地性不對(duì)稱故障會(huì)引發(fā)電流零序分量的出現(xiàn),因此接地性不對(duì)稱故障可用零序電流分量反映。
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