來源：昌昇自動化時間：2021-07-27
變頻器過電流故障分加速中過電流、運yun行xing中zhong過guo電dian流liu和he減jian速su中zhong過guo電dian流liu三san種zhong過guo電dian流liu故gu障zhang情qing況kuang，是shi在zai變bian頻pin器qi運yun行xing過guo程cheng中zhong變bian頻pin器qi電dian流liu超chao過guo了le電dian流liu保bao護hu動dong作zuo設she定ding值zhi出chu現xian的de保bao護hu動dong作zuo。出chu現xian這zhe一yi變頻器維修故障的原因有可能是：①電動機所帶負載過重；②變頻器輸出電路發生相間短路或者發生對地短路；③電機在運行過程中投入變頻器，但是和啟動模式不匹配；④變頻器本身的故障使加速時間過短；⑤過電流保護值設置過低，與負載不相適應。當德力西變頻器在(zai)使(shi)用(yong)過(guo)程(cheng)中(zhong)產(chan)生(sheng)過(guo)電(dian)流(liu)時(shi)，變(bian)頻(pin)器(qi)維(wei)修(xiu)時(shi)首(shou)先(xian)查(zha)看(kan)變(bian)頻(pin)器(qi)相(xiang)關(guan)參(can)數(shu)有(you)沒(mei)有(you)問(wen)題(ti)，明(ming)確(que)發(fa)生(sheng)故(gu)障(zhang)時(shi)的(de)實(shi)際(ji)電(dian)流(liu)值(zhi)是(shi)多(duo)少(shao)，然(ran)後(hou)根(gen)據(ju)變(bian)頻(pin)器(qi)及(ji)負(fu)載(zai)狀(zhuang)況(kuang)判(pan)斷(duan)故(gu)障(zhang)發(fa)生(sheng)的(de)原(yuan)因(yin)是(shi)什(shen)麼(me)。
變(bian)頻(pin)器(qi)維(wei)修(xiu)中(zhong)發(fa)生(sheng)對(dui)地(di)短(duan)路(lu)故(gu)障(zhang)的(de)原(yuan)因(yin)可(ke)能(neng)是(shi)因(yin)為(wei)電(dian)動(dong)機(ji)或(huo)電(dian)纜(lan)對(dui)地(di)短(duan)路(lu)造(zao)成(cheng)的(de)，此(ci)時(shi)應(ying)斷(duan)開(kai)電(dian)纜(lan)與(yu)變(bian)頻(pin)器(qi)的(de)連(lian)接(jie)，用(yong)相(xiang)應(ying)等(deng)級(ji)的(de)絕(jue)緣(yuan)表(biao)檢(jian)查(zha)電(dian)動(dong)機(ji)和(he)電(dian)纜(lan)的(de)對(dui)地(di)絕(jue)緣(yuan)值(zhi)。在(zai)變(bian)頻(pin)器(qi)維(wei)修(xiu)對(dui)地(di)短(duan)路(lu)時(shi)切(qie)記(ji)不(bu)得(de)直(zhi)接(jie)測(ce)量(liang)變(bian)頻(pin)器(qi)端(duan)子(zi)的(de)對(dui)地(di)絕(jue)緣(yuan)電(dian)阻(zu)，因(yin)為(wei)變(bian)頻(pin)器(qi)的(de)輸(shu)入(ru)、輸shu出chu元yuan件jian均jun具ju有you一yi定ding耐nai壓ya的de電dian子zi元yuan器qi件jian，如ru果guo變bian頻pin器qi測ce量liang不bu當dang會hui將jiang其qi擊ji穿chuan。如ru果guo電dian動dong機ji及ji電dian纜lan的de絕jue緣yuan在zai允yun許xu的de範fan圍wei內nei，則ze應ying認ren為wei是shi變bian頻pin器qi自zi身shen的de質zhi量liang問wen題ti。
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