1)類型選擇

    一般情況(kuang)下，可(ke)選用兩相結構(gou)的熱繼電(dian)(dian)器(qi)，但當三相電(dian)(dian)壓的均衡(heng)性較(jiao)差，工作環境惡(e)劣或無人看(kan)管(guan)的電(dian)(dian)動機，宜選用三相結構(gou)的熱繼電(dian)(dian)器(qi)。對于三角形接(jie)線(xian)的電(dian)(dian)動機，應(ying)選用帶斷相保護裝(zhuang)置的熱繼電(dian)(dian)器(qi)。

 2)熱(re)繼電器額(e)定電流選擇(ze)

    熱(re)繼電(dian)(dian)器的(de)額定(ding)(ding)電(dian)(dian)流應大于電(dian)(dian)動(dong)機額定(ding)(ding)電(dian)(dian)流。然后根據該額定(ding)(ding)電(dian)(dian)流來選擇熱(re)繼電(dian)(dian)器的(de)型號(hao)。

 3)熱元件額定(ding)電(dian)流的選擇和(he)整定(ding)

    熱(re)(re)元件的(de)(de)額(e)(e)定電(dian)(dian)(dian)(dian)流(liu)(liu)應(ying)略大于(yu)電(dian)(dian)(dian)(dian)動(dong)(dong)(dong)機(ji)額(e)(e)定電(dian)(dian)(dian)(dian)流(liu)(liu)。當電(dian)(dian)(dian)(dian)動(dong)(dong)(dong)機(ji)啟(qi)動(dong)(dong)(dong)電(dian)(dian)(dian)(dian)流(liu)(liu)為(wei)其額(e)(e)定電(dian)(dian)(dian)(dian)流(liu)(liu)的(de)(de)6倍及啟(qi)動(dong)(dong)(dong)時(shi)間(jian)不超過5S時(shi)，熱(re)(re)無件的(de)(de)整定電(dian)(dian)(dian)(dian)流(liu)(liu)調節(jie)到(dao)等于(yu)電(dian)(dian)(dian)(dian)動(dong)(dong)(dong)機(ji)的(de)(de)額(e)(e)定電(dian)(dian)(dian)(dian)流(liu)(liu)；當電(dian)(dian)(dian)(dian)動(dong)(dong)(dong)機(ji)的(de)(de)啟(qi)動(dong)(dong)(dong)時(shi)間(jian)較長(chang)、拖動(dong)(dong)(dong)沖(chong)擊(ji)性(xing)負載(zai)或不允許停車時(shi)，熱(re)(re)元件整定電(dian)(dian)(dian)(dian)流(liu)(liu)調節(jie)到(dao)電(dian)(dian)(dian)(dian)動(dong)(dong)(dong)機(ji)額(e)(e)定電(dian)(dian)(dian)(dian)流(liu)(liu)的(de)(de)1.1-1.15倍。