三相電流不平衡對電動機的危害有哪些?
由于三(san)(san)相不(bu)平(ping)衡電(dian)(dian)流可以(yi)(yi)分(fen)解為正(zheng)(zheng)(zheng)序(xu)、負序(xu)、零序(xu)三(san)(san)個分(fen)量,負序(xu)分(fen)量產生的(de)旋轉磁場(chang)與正(zheng)(zheng)(zheng)序(xu)分(fen)量產生的(de)旋轉磁場(chang)相反,起到制(zhi)動(dong)作(zuo)用(yong)。但由于正(zheng)(zheng)(zheng)序(xu)磁場(chang)比負序(xu)磁場(chang)要(yao)強(qiang)得多,電(dian)(dian)動(dong)機(ji)仍(reng)按(an)正(zheng)(zheng)(zheng)序(xu)磁場(chang)方向轉動(dong)。而(er)(er)由于負序(xu)磁場(chang)的(de)制(zhi)動(dong)作(zuo)用(yong),必將引起電(dian)(dian)動(dong)機(ji)輸出功率(lv)減少,從(cong)而(er)(er)導致電(dian)(dian)動(dong)機(ji)效率(lv)降低。同時,電(dian)(dian)動(dong)機(ji)的(de)溫升和無功損耗,也(ye)將隨不(bu)平(ping)衡度的(de)增(zeng)大(da)而(er)(er)增(zeng)大(da)。所(suo)以(yi)(yi)電(dian)(dian)動(dong)機(ji)在三(san)(san)相不(bu)平(ping)衡狀(zhuang)況下運行,是非常不(bu)經濟和不(bu)安全的(de)。
選擇上(shang)海碩吉電(dian)(dian)器(qi)有(you)限(xian)公司生產的三(san)(san)相(xiang)電(dian)(dian)流(liu)不(bu)平(ping)衡(heng)保(bao)(bao)護(hu)器(qi),如(ru),SJD-Y/SJD-CS/SJD-YR/SJD801/SJD811/SJD813等三(san)(san)相(xiang)電(dian)(dian)流(liu)不(bu)平(ping)衡(heng)保(bao)(bao)護(hu)器(qi)就可以為電(dian)(dian)動(dong)機(ji)提(ti)供(gong)三(san)(san)相(xiang)電(dian)(dian)流(liu)不(bu)平(ping)衡(heng)保(bao)(bao)護(hu),能有(you)效避免電(dian)(dian)動(dong)機(ji)在長時間(jian)三(san)(san)相(xiang)不(bu)平(ping)衡(heng)運轉下導(dao)致電(dian)(dian)動(dong)機(ji)燒(shao)壞(huai)。