聯系(xi)電(dian)話：13917768445
聯系(xi)電(dian)話：13917768445
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電機保護器工作原理
電動機保護器由(you)三相(xiang)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)互(hu)感(gan)器(qi)、檢(jian)測(ce)、放大(da)、延時(shi)(shi)、調整電(dian)(dian)(dian)(dian)(dian)路(lu)和執行繼(ji)電(dian)(dian)(dian)(dian)(dian)器(qi)組成(cheng)。檢(jian)測(ce)電(dian)(dian)(dian)(dian)(dian)路(lu)檢(jian)測(ce)到電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)互(hu)感(gan)器(qi)感(gan)應的電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)缺(que)相(xiang)或(huo)大(da)于(yu)設定值時(shi)(shi)，經放大(da)器(qi)放大(da)，使繼(ji)電(dian)(dian)(dian)(dian)(dian)器(qi)動(dong)作(zuo)。繼(ji)電(dian)(dian)(dian)(dian)(dian)器(qi)觸(chu)頭串接(jie)于(yu)接(jie)觸(chu)器(qi)線圈供(gong)電(dian)(dian)(dian)(dian)(dian)回路(lu)中，繼(ji)電(dian)(dian)(dian)(dian)(dian)器(qi)動(dong)作(zuo)后使接(jie)觸(chu)器(qi)斷電(dian)(dian)(dian)(dian)(dian)，起到保(bao)護電(dian)(dian)(dian)(dian)(dian)機作(zuo)用。延時(shi)(shi)電(dian)(dian)(dian)(dian)(dian)路(lu)用于(yu)避(bi)開電(dian)(dian)(dian)(dian)(dian)機起動(dong)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)，其時(shi)(shi)長(chang)可(ke)調。調整電(dian)(dian)(dian)(dian)(dian)路(lu)用于(yu)根(gen)據(ju)被保(bao)護電(dian)(dian)(dian)(dian)(dian)機工(gong)作(zuo)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)精確設置動(dong)作(zuo)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)。
電(dian)動機(ji)(ji)保(bao)(bao)護(hu)器(qi)(qi)是(shi)經典的電(dian)機(ji)(ji)星三角啟動方(fang)式(shi)，主要(yao)是(shi)保(bao)(bao)護(hu)熱繼電(dian)器(qi)(qi)，若使用(yong)熱繼電(dian)器(qi)(qi)對(dui)大型電(dian)機(ji)(ji)作(zuo)保(bao)(bao)護(hu)，就會使大電(dian)線出現(xian)(xian)斷點(dian)，也(ye)就是(shi)進出熱繼電(dian)器(qi)(qi)的螺(luo)絲接線問題，容易出現(xian)(xian)發熱點(dian)和(he)故(gu)障(zhang)點(dian)。如果不用(yong)熔斷器(qi)(qi)和(he)熱繼電(dian)器(qi)(qi)，而采用(yong)電(dian)機(ji)(ji)綜合保(bao)(bao)護(hu)器(qi)(qi)來(lai)實(shi)現(xian)(xian)，因為(wei)保(bao)(bao)護(hu)器(qi)(qi)是(shi)穿心式(shi)，就可以減少大電(dian)線的斷點(dian)，從而減少發熱點(dian)和(he)故(gu)障(zhang)點(dian)。
使用(yong)電(dian)動機(ji)保護器(qi)時必(bi)須(xu)注意控制(zhi)線路(lu)的接線問題，以(yi)確保機(ji)器(qi)的正常運行(xing)，它(ta)可以(yi)代替斷路(lu)器(qi)、接觸(chu)器(qi)、熱(re)繼電(dian)器(qi)、熔斷器(qi)等低壓電(dian)器(qi)的一項產(chan)品。
電機保護器工作原理
電(dian)(dian)(dian)(dian)動(dong)(dong)(dong)機燒毀的(de)主(zhu)(zhu)要原因(yin)是運行(xing)(xing)時(shi)出(chu)現斷(duan)相(xiang)和(he)過載(zai)燒毀繞組，因(yin)而，有電(dian)(dian)(dian)(dian)動(dong)(dong)(dong)機存(cun)在的(de)電(dian)(dian)(dian)(dian)路(lu)應(ying)該裝設有電(dian)(dian)(dian)(dian)動(dong)(dong)(dong)機保護器(qi)(qi)，以(yi)保證在電(dian)(dian)(dian)(dian)動(dong)(dong)(dong)機出(chu)現斷(duan)相(xiang)和(he)過流運行(xing)(xing)時(shi)及(ji)時(shi)切斷(duan)工作電(dian)(dian)(dian)(dian)源， 保護電(dian)(dian)(dian)(dian)動(dong)(dong)(dong)機免(mian)受損(sun)壞，小型(xing)(xing)電(dian)(dian)(dian)(dian)動(dong)(dong)(dong)機的(de)主(zhu)(zhu)要保護器(qi)(qi)是熱(re)繼(ji)電(dian)(dian)(dian)(dian)器(qi)(qi)，而當面對大型(xing)(xing)電(dian)(dian)(dian)(dian)動(dong)(dong)(dong)機時(shi)，如(ru)果還使用(yong)熱(re)繼(ji)電(dian)(dian)(dian)(dian)器(qi)(qi)對電(dian)(dian)(dian)(dian)動(dong)(dong)(dong)機進(jin)行(xing)(xing)保護的(de)話其連接(jie)點（即進(jin)出(chu)熱(re)繼(ji)電(dian)(dian)(dian)(dian)器(qi)(qi)的(de)螺(luo)絲接(jie)線(xian)(xian)(xian)(xian)點）就很容易出(chu)現發(fa)(fa)熱(re)現象及(ji)發(fa)(fa)生故(gu)障(zhang)為避免(mian)如(ru)上(shang)問題，就出(chu)現了電(dian)(dian)(dian)(dian)動(dong)(dong)(dong)機綜合(he)保護器(qi)(qi)，電(dian)(dian)(dian)(dian)動(dong)(dong)(dong)機綜合(he)保護器(qi)(qi)是穿心式的(de)，可(ke)以(yi)誠少(shao)電(dian)(dian)(dian)(dian)線(xian)(xian)(xian)(xian)連接(jie)點，可(ke)以(yi)減少(shao)發(fa)(fa)熱(re)點和(he)故(gu)障(zhang)點價格也便宜。使用(yong)電(dian)(dian)(dian)(dian)機綜合(he)保護器(qi)(qi)時(shi)必須注(zhu)意控制線(xian)(xian)(xian)(xian)路(lu)的(de)接(jie)線(xian)(xian)(xian)(xian)問題，以(yi)確(que)保正常(chang)運行(xing)(xing)。
有的電(dian)(dian)機綜合保(bao)護(hu)(hu)器往(wang)明，一定要接上負(fu)載才能(neng)正常工作(zuo)(zuo)不接負(fu)載時表示電(dian)(dian)路處于缺(que)相工作(zuo)(zuo)狀態，因此綜合保(bao)護(hu)(hu)器是(shi)拒絕合閘的，電(dian)(dian)動機將無法啟動，這說明電(dian)(dian)機綜合保(bao)護(hu)(hu)器內(nei)部是(shi)依靠電(dian)(dian)流互感器來(lai)檢(jian)測(ce)三相線電(dian)(dian)流的有無，來(lai)判斷電(dian)(dian)路是(shi)否存在(zai)缺(que)相問題，因而在(zai)未接通電(dian)(dian)源或沒有負(fu)載時，個(ge)閉點(dian)實際上是(shi)開點(dian)所以，沒辦法合閘。
某些大型電機冷卻系統故障或是長時間工作在高溫高濕環境下造成電機故障。電動機保護原理的研究是保證電動機保護器性能高低的關鍵，根據三相對稱分量法的理論，三個不對稱的向量可以唯一分解成三組對稱的向量，分別為正序分量、負序分量和零序分量。電動機在發生對稱故障和不對稱故障時，電動機的三相電流都會發生變化。電動機故障條件流過繞組的電流過大，超過電動機的額定電流，因此可根據這一特征來對電動機過電流進行保護。電機過載、斷相、欠壓都會造成繞組電流超過額定值。電源電壓欠壓，運行電流上升的比例將等于電壓下降的比例;電機過載時，常造成堵轉，此時的運行電流會大大超過額定電流。針對以上情況，電動機保護器可通過對(dui)三相運(yun)行電(dian)流進行檢(jian)測，根據運(yun)行電(dian)流的不(bu)同(tong)性(xing)質來(lai)確定不(bu)同(tong)的保護方(fang)式，從而對(dui)電(dian)機予以的斷電(dian)保護。
