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配电箱内电动机开关电流大小选型技巧

文(wen)章(zhang)出处(chu):人气:121发(fa)表时间:2021-04-09 10:26:59

配电箱在电动机控制应用较广泛,电动机功率不同电流不一样对配电箱电源开关的选择也不一样。那怎样根据电动功率大小来选择合适的电源开关呢。下面给大家来详细分析。

1、配电箱内小型电动机不需做频繁操作的或不需作转向和变速操作,一般只需一个开关,需要频繁操作的。或需进行转向和变速操作的装两个开关(称二级控制),前一个开关作控制电源用。叫控制开关,常采用铁壳开关、自动空气开关和转换开关。后一个开关用来直接操作电动机的叫操作开关。

配电箱内电动机开关电流大小选型技巧

2、如果配电箱内采(cai)用启动(dong)(dong)器(qi)的(de)(de),则启动(dong)(dong)器(qi)就是操作(zuo)开(kai)(kai)(kai)关(guan)(guan)(guan)凡(fan)采(cai)用无明(ming)显分断点的(de)(de)开(kai)(kai)(kai)关(guan)(guan)(guan),如电磁开(kai)(kai)(kai)关(guan)(guan)(guan),必須装两个(ge)开(kai)(kai)(kai)关(guan)(guan)(guan),在(zai)前一级装一个(ge)有明(ming)显分断点的(de)(de)开(kai)(kai)(kai)关(guan)(guan)(guan),如刀开(kai)(kai)(kai)关(guan)(guan)(guan)、转换开(kai)(kai)(kai)关(guan)(guan)(guan)等作(zuo)控制开(kai)(kai)(kai)关(guan)(guan)(guan)。凡(fan)容易产生(sheng)误(wu)动(dong)(dong)作(zuo)的(de)(de)开(kai)(kai)(kai)关(guan)(guan)(guan),如手柄倒顺开(kai)(kai)(kai)关(guan)(guan)(guan)、按钮开(kai)(kai)(kai)关(guan)(guan)(guan)等,也必须在(zai)前一级加装控开(kai)(kai)(kai)关(guan)(guan)(guan),以防开(kai)(kai)(kai)关(guan)(guan)(guan)误(wu)动(dong)(dong)作(zuo)而造成事(shi)故。

3、熔(rong)断器的(de)(de)安装(zhuang)熔(rong)断器必须(xu)(xu)与开(kai)(kai)关(guan)(guan)装(zhuang)在(zai)同一块木台上(shang),或同一个控(kong)制(zhi)箱内。凡作(zuo)(zuo)为保护用的(de)(de)熔(rong)断器,必须(xu)(xu)装(zhuang)在(zai)控(kong)制(zhi)开(kai)(kai)关(guan)(guan)的(de)(de)后级和(he)操作(zuo)(zuo)开(kai)(kai)关(guan)(guan)(包括(kuo)启动(dong)(dong)开(kai)(kai)关(guan)(guan))的(de)(de)前级用自(zi)动(dong)(dong)空气开(kai)(kai)关(guan)(guan)作(zuo)(zuo)控(kong)制(zhi)开(kai)(kai)关(guan)(guan)时,而所采用操作(zuo)(zuo)开(kai)(kai)关(guan)(guan)又无保护装(zhuang)置,就应在(zai)自(zi)动(dong)(dong)空气开(kai)(kai)关(guan)(guan)的(de)(de)前一级装(zhuang)一道熔(rong)断器作(zuo)(zuo)双重(zhong)保护,以免(mian)热(re)脱(tuo)(tuo)扣器或电磁脱(tuo)(tuo)扣器失灵时,

4、能由(you)熔断(duan)(duan)(duan)器起保(bao)护作用(yong),同(tong)时可兼(jian)作隔离(li)开关(guan),以便维修时切断(duan)(duan)(duan)电源(yuan)采用(yong)倒顺(shun)开关(guan)和电磁开关(guan)作操作开关(guan),而前级(ji)(ji)用(yong)转换开关(guan)作控(kong)制开关(guan)时(一般机床(chuang)常采用(yong)这种结构形(xing)式),必须在两级(ji)(ji)开关(guan)之间(jian)安(an)(an)装一道熔断(duan)(duan)(duan)器。每道熔断(duan)(duan)(duan)器在三相回路(lu)中应安(an)(an)装三个型号、规格相同(tong)的熔丝,分别串接在三根(gen)相线上(shang)

5、配电(dian)(dian)(dian)(dian)(dian)箱中(zhong)电(dian)(dian)(dian)(dian)(dian)压(ya)(ya)表和电(dian)(dian)(dian)(dian)(dian)流表的安装(zhuang)有(you)些大、中(zhong)型或要(yao)(yao)求较高的电(dian)(dian)(dian)(dian)(dian)动(dong)机(ji),为(wei)(wei)对电(dian)(dian)(dian)(dian)(dian)源电(dian)(dian)(dian)(dian)(dian)压(ya)(ya)和额定电(dian)(dian)(dian)(dian)(dian)流进行(xing)监视,在控(kong)制板上应同(tong)时(shi)装(zhuang)有(you)电(dian)(dian)(dian)(dian)(dian)压(ya)(ya)表和电(dian)(dian)(dian)(dian)(dian)流表,接线方法下图所示,电(dian)(dian)(dian)(dian)(dian)压(ya)(ya)表通常只(zhi)用只(zhi),通过换(huan)相(xiang)开关进行(xing)换(huan)相(xiang)测量(liang),电(dian)(dian)(dian)(dian)(dian)压(ya)(ya)表的量(liang)程为(wei)(wei)450伏或500伏。要(yao)(yao)求较高的应装(zhuang)三个电(dian)(dian)(dian)(dian)(dian)流表,一(yi)般要(yao)(yao)求的,可只(zhi)装(zhuang)一(yi)个电(dian)(dian)(dian)(dian)(dian)流表串(chuan)接在第二(er)相(xiang)。

配电箱电压电流表接线图

6、配(pei)电(dian)(dian)箱(xiang)内电(dian)(dian)流(liu)(liu)(liu)(liu)表的(de)规格必须使得电(dian)(dian)动(dong)机启动(dong)电(dian)(dian)流(liu)(liu)(liu)(liu)通过(guo),宜选用大(da)于(yu)额定电(dian)(dian)流(liu)(liu)(liu)(liu)23倍(bei)的(de)量程,若电(dian)(dian)动(dong)机额定电(dian)(dian)流(liu)(liu)(liu)(liu)大(da)于(yu)50安时,电(dian)(dian)流(liu)(liu)(liu)(liu)的(de)测量应通过(guo)互(hu)感器(qi)进行变流(liu)(liu)(liu)(liu)测量,电(dian)(dian)流(liu)(liu)(liu)(liu)互(hu)感器(qi)的(de)规格同样要大(da)于(yu)电(dian)(dian)动(dong)机额定电(dian)(dian)流(liu)(liu)(liu)(liu)的(de)2-3倍(bei),配(pei)用电(dian)(dian)流(liu)(liu)(liu)(liu)互(hu)感器(qi)的(de)电(dian)(dian)流(liu)(liu)(liu)(liu)表规格,可选用5安的(de)接线方法见图7-10。隔离熔(rong)断器(qi)腔制开关电(dian)(dian)压表相开关控制开关保(bao)护熔(rong)

以(yi)上就是(shi)对(dui)配(pei)电(dian)箱内电(dian)动机开关(guan)电(dian)流大小造型(xing)技巧总结,由(you)于电(dian)气技术的进步。在工控领域中出(chu)现了很多智(zhi)能(neng)控制(zhi)设备,这(zhei)些(xie)新型(xing)电(dian)源开关(guan)更(geng)加智(zhi)能(neng)化,保护措施(shi)也越来越好。配(pei)电(dian)箱正在朝着智(zhi)能(neng)化控制(zhi)方向发展。


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