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1、普通鼠籠式電(dian)(dian)(dian)(dian)動機(ji)在空載全壓直接啟(qi)動時，啟(qi)動電(dian)(dian)(dian)(dian)流(liu)會(hui)達到額定(ding)電(dian)(dian)(dian)(dian)流(liu)的4—7倍。當電(dian)(dian)(dian)(dian)動機(ji)容量(liang)相對較大(da)時，該(gai)啟(qi)動電(dian)(dian)(dian)(dian)流(liu)將引(yin)起(qi)電(dian)(dian)(dian)(dian)網電(dian)(dian)(dian)(dian)壓急劇下降，電(dian)(dian)(dian)(dian)壓頻率(lv)也會(hui)發(fa)生變化，這會(hui)破(po)壞同電(dian)(dian)(dian)(dian)網其它設備的正常運行，甚至會(hui)引(yin)起(qi)電(dian)(dian)(dian)(dian)網失去穩定(ding)，造(zao)成(cheng)更大(da)的事故。
2、電(dian)動(dong)機(ji)全壓啟(qi)動(dong)時的(de)(de)大電(dian)流(liu)在定(ding)子線圈(quan)和(he)轉子鼠籠(long)條上產(chan)(chan)生(sheng)很大的(de)(de)沖(chong)擊力，會(hui)破壞(huai)繞組絕(jue)緣和(he)造成鼠籠(long)條斷裂，引起電(dian)機(ji)故(gu)障，大電(dian)流(liu)還會(hui)產(chan)(chan)生(sheng)大量的(de)(de)焦耳熱，損傷繞組絕(jue)緣，減少電(dian)機(ji)壽命。
3、串聯電抗器啟動為有級降(jiang)壓(ya)(ya)(ya)啟動，在全壓(ya)(ya)(ya)切(qie)換時轉矩有躍變，會產生(sheng)機械沖擊。與直接全壓(ya)(ya)(ya)啟動相比(bi)，操作(zuo)過電壓(ya)(ya)(ya)的(de)(de)(de)幾率會小些。但(dan)由于高頻振蕩(dang)的(de)(de)(de)隨機性，大幅(fu)值的(de)(de)(de)操作(zuo)過電壓(ya)(ya)(ya)還是有可能出現的(de)(de)(de)。