在繼電器線圈(quan)兩端并聯一個二極(ji)管(guan),正確的(de)說法應該(gai)是稱(cheng)為“反(fan)相”二極(ji)管(guan),當然作用(yong)就是用(yong)來保護(hu)驅動三極(ji)管(guan)不會被電感的(de)反(fan)電動勢擊穿(chuan)。
在選用電(dian)磁電(dian)流繼電(dian)器前,要(yao)先了解必(bi)要(yao)的條件(jian):1、控制電(dian)路的電(dian)源電(dian)壓,能提供的最(zui)大電(dian)流;2、被(bei)控制電(dian)路中(zhong)的電(dian)壓和電(dian)流等。
電流繼電器的返(fan)回系(xi)數就是繼電器的返(fan)回量數值與動(dong)作量數值的比值。
過電(dian)(dian)(dian)(dian)流(liu)繼電(dian)(dian)(dian)(dian)器(qi)是用(yong)于回(hui)路中電(dian)(dian)(dian)(dian)流(liu)跨(kua)過設定值時動作,熱(re)繼電(dian)(dian)(dian)(dian)器(qi)通常用(yong)于電(dian)(dian)(dian)(dian)機的過載(zai)維護(hu),避免電(dian)(dian)(dian)(dian)機過載(zai);熱(re)繼電(dian)(dian)(dian)(dian)器(qi)是用(yong)于電(dian)(dian)(dian)(dian)動機或其(qi)它電(dian)(dian)(dian)(dian)氣設備、電(dian)(dian)(dian)(dian)氣線路的過載(zai)維護(hu)的維護(hu)電(dian)(dian)(dian)(dian)器(qi)。
電(dian)流(liu)(liu)(liu)繼電(dian)器(qi)是過流(liu)(liu)(liu)動作,小于整定值后返回;為了避免電(dian)流(liu)(liu)(liu)在整定值附近時導致繼電(dian)器(qi)頻繁啟動返回,一般要設一個返回值,例(li)如0.97,電(dian)流(liu)(liu)(liu)小于0.97才(cai)返回。
如何(he)區(qu)分常(chang)(chang)開常(chang)(chang)閉(bi)觸(chu)點(dian)。電流繼電器其(qi)實(shi)分為常(chang)(chang)開和常(chang)(chang)閉(bi)觸(chu)點(dian),常(chang)(chang)閉(bi)觸(chu)點(dian)就是(shi)就是(shi)阻(zu)值為零(ling)時(shi)候的兩端(duan),不過(guo)這個值一般(ban)都會有幾歐姆,可用(yong)萬用(yong)表來測量(liang),測量(liang)電阻(zu)即(ji)可。
繼(ji)電器的觸(chu)點(dian)(dian)就是(shi)處于常(chang)(chang)開(kai)(kai)或(huo)(huo)者常(chang)(chang)閉(bi)的狀(zhuang)態,也就是(shi)簡(jian)單的理解為開(kai)(kai)關常(chang)(chang)開(kai)(kai)或(huo)(huo)者常(chang)(chang)關使信號接(jie)通或(huo)(huo)者斷(duan)開(kai)(kai)的接(jie)點(dian)(dian)就叫繼(ji)電器的觸(chu)點(dian)(dian)。
由于電(dian)(dian)流(liu)(liu)繼電(dian)(dian)器觸點的(de)跳動或者開閉的(de)一瞬間均會(hui)引起感性負載(zai)的(de)變化,產生氣體放電(dian)(dian)現象,但(dan)(dan)電(dian)(dian)流(liu)(liu)繼電(dian)(dian)器觸點通(tong)斷的(de)電(dian)(dian)流(liu)(liu)較(jiao)小,觸點間不會(hui)出現電(dian)(dian)弧,但(dan)(dan)會(hui)出現“火(huo)花(hua)放電(dian)(dian)”。
熱電流繼電器的復位方(fang)式(shi)有手(shou)動復位和自動復位兩種方(fang)式(shi)。
現在(zai)有(you)一種新型的星三角時間繼電(dian)(dian)器(qi),具有(you)記憶功能(neng),有(you)兩個(ge)線圈,一個(ge)是吸(xi)zhidao合(he)(he)線圈,加(jia)上電(dian)(dian)壓繼電(dian)(dian)器(qi)吸(xi)合(he)(he),但(dan)吸(xi)合(he)(he)線圈斷電(dian)(dian)后繼電(dian)(dian)器(qi)仍然(ran)保持吸(xi)合(he)(he)狀態。
電(dian)(dian)(dian)流(liu)(liu)(liu)繼電(dian)(dian)(dian)器(qi)主(zhu)要(yao)是反映電(dian)(dian)(dian)流(liu)(liu)(liu)變化,在電(dian)(dian)(dian)器(qi)設備的(de)電(dian)(dian)(dian)氣回(hui)路(lu)中(zhong)可以起到電(dian)(dian)(dian)流(liu)(liu)(liu)保(bao)護和控制的(de)作(zuo)用。電(dian)(dian)(dian)流(liu)(liu)(liu)繼電(dian)(dian)(dian)器(qi)是接在主(zhu)回(hui)路(lu)當(dang)中(zhong),當(dang)回(hui)路(lu)中(zhong)的(de)電(dian)(dian)(dian)流(liu)(liu)(liu)達(da)到電(dian)(dian)(dian)流(liu)(liu)(liu)繼電(dian)(dian)(dian)器(qi)規定范圍外的(de)電(dian)(dian)(dian)流(liu)(liu)(liu)值時(shi)這時(shi)就(jiu)會跳(tiao)開主(zhu)回(hui)路(lu)同時(shi)發生相關信號(hao)。
正常情況下,線圈中流入負(fu)荷電流,為保證繼電器不動(dong)(dong)作(zuo),可動(dong)(dong)舌片(pian)受彈(dan)簧(huang)7反作(zuo)用力(li)的控制而保持在原始位置,此時彈(dan)簧(huang)產生的力(li)矩(ju)稱為初拉力(li)矩(ju)。由(you)于彈(dan)簧(huang)的張(zhang)力(li)與其伸(shen)長成正比,則舌片(pian)向(xiang)左移動(dong)(dong),彈(dan)簧(huang)產生反抗力(li)矩(ju)=初拉力(li)矩(ju)+空隙變化的比例。