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常規(gui)做法是M，△，Y三個一(yi)樣大，容量取電(dian)機額定電(dian)流值相近(jin)的規(gui)格。

比如37kw電(dian)機(ji)，額定電(dian)流約72A左(zuo)右(you)，可選(xuan)三個成品的65A的接觸器。因為是(shi)雙路供電(dian)，所以65A足(zu)夠了。

?省錢(qian)的(de)做法(fa)有兩種(zhong)，一(yi)是把星(xing)形接觸器的(de)容量降(jiang)一(yi)檔，比(bi)如(ru)上(shang)面的(de)用(yong)50A的(de)。另一(yi)種(zhong)是三個都(dou)往下降(jiang)一(yi)檔，只要(yao)容量超(chao)過電機(ji)電流的(de)一(yi)半(ban)以(yi)上(shang)就可用(yong)。

比如37kw，可以三個都用50A的。極限條件(jian)下甚(shen)至可以用到40~45A的接(jie)觸器，但壽(shou)命不長。

星三角降(jiang)壓啟(qi)動原(yuan)理電(dian)路圖

1.當負載對電(dian)動(dong)機(ji)啟動(dong)力矩無嚴格要(yao)求又要(yao)限制電(dian)動(dong)機(ji)啟動(dong)電(dian)流(liu)且電(dian)機(ji)滿足(zu)380V/Δ接線條件(jian)才(cai)能采用(yong)星三角(jiao)啟動(dong)方(fang)法； 

2.該方法是(shi)：在電(dian)機啟(qi)動(dong)時將電(dian)機接(jie)成(cheng)星型(xing)接(jie)線,當電(dian)機啟(qi)動(dong)成(cheng)功后再將電(dian)機改接(jie)成(cheng)三角型(xing)接(jie)線（通過雙投(tou)開關迅速切(qie)換）； 

3.因電(dian)機啟動(dong)電(dian)流與電(dian)源(yuan)電(dian)壓成正(zheng)比,此時電(dian)網提供的啟動(dong)電(dian)流只(zhi)有全(quan)(quan)電(dian)壓啟動(dong)電(dian)流的1/3 ，但啟動(dong)力(li)矩(ju)(ju)也只(zhi)有全(quan)(quan)電(dian)壓啟動(dong)力(li)矩(ju)(ju)的1/3。

星三(san)角啟(qi)(qi)動(dong)(dong)，屬降壓(ya)啟(qi)(qi)動(dong)(dong)他(ta)是(shi)(shi)以(yi)(yi)犧(xi)牲功(gong)率為(wei)代價來換取降低啟(qi)(qi)動(dong)(dong)電(dian)(dian)(dian)(dian)流(liu)來實(shi)現的(de)(de)。所(suo)以(yi)(yi)不能(neng)一概而以(yi)(yi)電(dian)(dian)(dian)(dian)機功(gong)率的(de)(de)大小來確(que)定是(shi)(shi)否需采用星三(san)角啟(qi)(qi)動(dong)(dong)，還的(de)(de)看(kan)是(shi)(shi)什么樣的(de)(de)負(fu)載(zai)(zai)，一般在(zai)需要(yao)啟(qi)(qi)動(dong)(dong)時負(fu)載(zai)(zai)輕運行(xing)時負(fu)載(zai)(zai)重尚可采用星三(san)角啟(qi)(qi)動(dong)(dong)，一般情況下鼠籠型電(dian)(dian)(dian)(dian)機的(de)(de)啟(qi)(qi)動(dong)(dong)電(dian)(dian)(dian)(dian)流(liu)是(shi)(shi)運行(xing)電(dian)(dian)(dian)(dian)流(liu)的(de)(de)5—7倍，而對電(dian)(dian)(dian)(dian)網(wang)的(de)(de)電(dian)(dian)(dian)(dian)壓(ya)要(yao)求一般是(shi)(shi)正負(fu)10%（我記憶中(zhong)）為(wei)了(le)不形成對電(dian)(dian)(dian)(dian)網(wang)電(dian)(dian)(dian)(dian)壓(ya)過大的(de)(de)沖擊所(suo)以(yi)(yi)要(yao)采用星三(san)角啟(qi)(qi)動(dong)(dong)，一般要(yao)求在(zai)鼠籠型電(dian)(dian)(dian)(dian)機的(de)(de)功(gong)率超過變壓(ya)器額定功(gong)率的(de)(de)10%時就要(yao)采用星三(san)角啟(qi)(qi)動(dong)(dong)。

來源：工控教練