過電流繼電器和熱繼電器的區別2020-06-01 15:27:00

過和熱繼電器的區別：

過電流繼電器是用(yong)(yong)(yong)于回路(lu)中電流跨(kua)過設定值時動(dong)作，熱繼電器通(tong)常用(yong)(yong)(yong)于電機(ji)的(de)過載(zai)維護，避免(mian)電機(ji)過載(zai)；熱繼電器是用(yong)(yong)(yong)于電動(dong)機(ji)或其它(ta)電氣(qi)設備、電氣(qi)線路(lu)的(de)過載(zai)維護的(de)維護電器。

電(dian)(dian)(dian)(dian)動(dong)(dong)(dong)機(ji)(ji)在實習作業(ye)中，如拖動(dong)(dong)(dong)出產機(ji)(ji)械進行作業(ye)進程中，若(ruo)機(ji)(ji)械呈現(xian)不(bu)正常的(de)狀況或電(dian)(dian)(dian)(dian)路反常使(shi)電(dian)(dian)(dian)(dian)動(dong)(dong)(dong)時(shi)(shi)機(ji)(ji)到過(guo)(guo)(guo)載(zai)(zai)，則電(dian)(dian)(dian)(dian)動(dong)(dong)(dong)機(ji)(ji)轉(zhuan)速(su)降低、繞(rao)(rao)(rao)組中的(de)電(dian)(dian)(dian)(dian)流(liu)將增(zeng)大，使(shi)電(dian)(dian)(dian)(dian)動(dong)(dong)(dong)機(ji)(ji)的(de)繞(rao)(rao)(rao)組溫度增(zeng)加。若(ruo)過(guo)(guo)(guo)載(zai)(zai)電(dian)(dian)(dian)(dian)流(liu)不(bu)大且過(guo)(guo)(guo)載(zai)(zai)的(de)時(shi)(shi)刻較短，電(dian)(dian)(dian)(dian)動(dong)(dong)(dong)機(ji)(ji)繞(rao)(rao)(rao)組不(bu)跨過(guo)(guo)(guo)容許溫升，這(zhe)種過(guo)(guo)(guo)載(zai)(zai)是容許的(de)。但若(ruo)過(guo)(guo)(guo)載(zai)(zai)時(shi)(shi)刻長，過(guo)(guo)(guo)載(zai)(zai)電(dian)(dian)(dian)(dian)流(liu)大，電(dian)(dian)(dian)(dian)動(dong)(dong)(dong)機(ji)(ji)繞(rao)(rao)(rao)組的(de)溫升就會跨過(guo)(guo)(guo)容許值，使(shi)電(dian)(dian)(dian)(dian)動(dong)(dong)(dong)機(ji)(ji)繞(rao)(rao)(rao)組老化(hua)，縮短電(dian)(dian)(dian)(dian)動(dong)(dong)(dong)機(ji)(ji)的(de)運用(yong)壽(shou)數，嚴峻時(shi)(shi)乃至會使(shi)電(dian)(dian)(dian)(dian)動(dong)(dong)(dong)機(ji)(ji)繞(rao)(rao)(rao)組焚毀。所以(yi)，這(zhe)種過(guo)(guo)(guo)載(zai)(zai)是電(dian)(dian)(dian)(dian)動(dong)(dong)(dong)機(ji)(ji)不(bu)能接受(shou)的(de)。熱(re)繼電(dian)(dian)(dian)(dian)器即(ji)是運用(yong)電(dian)(dian)(dian)(dian)流(liu)的(de)熱(re)效(xiao)應(ying)原理，在呈現(xian)電(dian)(dian)(dian)(dian)動(dong)(dong)(dong)機(ji)(ji)不(bu)能接受(shou)的(de)過(guo)(guo)(guo)載(zai)(zai)時(shi)(shi)堵(du)截電(dian)(dian)(dian)(dian)動(dong)(dong)(dong)機(ji)(ji)電(dian)(dian)(dian)(dian)路，為電(dian)(dian)(dian)(dian)動(dong)(dong)(dong)機(ji)(ji)供應(ying)過(guo)(guo)(guo)載(zai)(zai)維護(hu)的(de)維護(hu)電(dian)(dian)(dian)(dian)器。

運用熱(re)繼電(dian)(dian)器(qi)對(dui)電(dian)(dian)動(dong)機(ji)進行過(guo)載維護時(shi)，將熱(re)元件與(yu)電(dian)(dian)動(dong)機(ji)的(de)定子(zi)繞(rao)組串聯，將熱(re)繼電(dian)(dian)器(qi)的(de)常(chang)(chang)閉觸頭串聯在溝通觸摸(mo)(mo)器(qi)的(de)電(dian)(dian)磁線圈的(de)操控電(dian)(dian)路中，并調(diao)度(du)整定電(dian)(dian)流調(diao)度(du)旋鈕，使人字(zi)形(xing)(xing)撥桿(gan)與(yu)推桿(gan)相距一恰當間隔。當電(dian)(dian)動(dong)機(ji)正常(chang)(chang)作業(ye)時(shi)，經過(guo)熱(re)元件的(de)電(dian)(dian)流即為電(dian)(dian)動(dong)機(ji)的(de)額外電(dian)(dian)流，熱(re)元件發熱(re)，雙(shuang)金屬(shu)片(pian)受熱(re)后曲折，使推桿(gan)剛好(hao)與(yu)人字(zi)形(xing)(xing)撥桿(gan)觸摸(mo)(mo)，而又(you)不能推進聽字(zi)形(xing)(xing)撥桿(gan)。常(chang)(chang)閉觸頭處于閉合(he)狀況，溝通觸摸(mo)(mo)器(qi)堅持吸合(he)，電(dian)(dian)動(dong)機(ji)正常(chang)(chang)作業(ye)。

若電動(dong)機(ji)呈現(xian)過載狀況(kuang)，繞組中(zhong)電流增大，經過熱繼電器(qi)元件中(zhong)的電流增大使(shi)雙金(jin)屬片溫度(du)升得更高，曲折(zhe)程度(du)加大，推進聽字形撥桿，人字形撥桿推進常閉(bi)觸(chu)頭，使(shi)觸(chu)頭斷開而斷開溝通觸(chu)摸器(qi)線圈(quan)電路，使(shi)觸(chu)摸器(qi)開釋、堵截電動(dong)機(ji)的電源，電動(dong)機(ji)泊車而得到(dao)維護(hu)。

可見，熱繼電(dian)器通(tong)常是(shi)直接斷(duan)開(kai)觸(chu)摸器的操控回路(lu)(lu)來斷(duan)開(kai)主回路(lu)(lu)的。

過(guo)電(dian)(dian)流(liu)繼電(dian)(dian)器(qi)：用(yong)于電(dian)(dian)機或(huo)其它電(dian)(dian)氣設備(bei)，在電(dian)(dian)流(liu)跨過(guo)設定值(zhi)時動作（吸合）。堵(du)截主電(dian)(dian)路，或(huo)宣告信號。