電動機(ji)綜合保(bao)護器(qi)(qi)在控制系統中的保(bao)護功(gong)能(neng)。 電動機(ji)綜合保(bao)護器(qi)(qi)除過載(zai),斷路(lu)等(deng)常(chang)見保(bao)護之外的保(bao)護功(gong)能(neng),在實際(ji)使(shi)用中,我(wo)們(men)發現此保(bao)護器(qi)(qi)有以下幾種保(bao)護功(gong)能(neng)非常(chang)實用,是熱繼電器(qi)(qi)所無(wu)法替(ti)代的。 (1)三相不平衡
直流斷路器(qi)過(guo)載防(fang)(fang)(fang)護(hu)(hu),是否配電(dian)回路都必(bi)須裝(zhuang)(zhuang)設過(guo)載防(fang)(fang)(fang)護(hu)(hu)電(dian)器(qi)來防(fang)(fang)(fang)回路過(guo)載?否。 除火災(zai)成爆炸危險場所外(wai),一(yi)般(ban)場所內有些(xie)回 各是可以視情(qing)況只裝(zhuang)(zhuang)短路防(fang)(fang)(fang)護(hu)(hu)電(dian)器(qi)而不裝(zhuang)(zhuang)設過(guo)載防(fang)(fang)(fang)護(hu)(hu)電(dian)器(qi),例(li)如:&
防雷(lei)(lei)器(qi),是(shi)用(yong)于(yu)帶電(dian)(dian)系(xi)統中限定瞬(shun)態過(guo)電(dian)(dian)壓(ya)和導引(yin)泄放電(dian)(dian)涌電(dian)(dian)流的非(fei)線性防護器(qi)件,用(yong)以保護耐壓(ya)水平低的電(dian)(dian)器(qi)或(huo)電(dian)(dian)子系(xi)統免遭雷(lei)(lei)擊及(ji)雷(lei)(lei)擊電(dian)(dian)磁脈沖(chong)或(huo)利用(yong)過(guo)電(dian)(dian)壓(ya)的危害。 最近幾年來,電(dian)(dian)子信息系(xi)統(如電(dian)(dian)視,電(dian)(dian)話,通
雷電(dian)(dian)放電(dian)(dian)也許產生在云(yun)(yun)層之間或(huo)云(yun)(yun)層外(wai)部,或(huo)云(yun)(yun)層對(dui)地之間,其它良多大容量電(dian)(dian)氣設(she)備的應用帶(dai)來的外(wai)部浪(lang)涌,對(dui)供(gong)電(dian)(dian)系統(中國(guo)低壓(ya)供(gong)電(dian)(dian)系統標準(zhun):AC50Hz220/380V)和用電(dian)(dian)設(she)備的影響以及防(fang)(fang)雷和防(fang)(fang)浪(lang)涌的
電(dian)動機(ji)保護(hu)器(qi)(qi)采(cai)用(yong)模塊化結(jie)構設計,將主控制器(qi)(qi)與顯(xian)示(shi)操作模塊分開(kai),并(bing)可根據(ju)實際需要選(xuan)擇是否采(cai)用(yong)顯(xian)示(shi)操作模塊,可取代傳統的塑殼斷路器(qi)(qi)(僅用(yong)刀熔(rong)開(kai)關(guan)即可),熱(re)繼電(dian)器(qi)(qi),電(dian)流(liu)互感器(qi)(qi),多種(zhong)信號燈,電(dian)流(liu)表,大電(dian)流(liu)
電(dian)(dian)(dian)涌保(bao)護器系統(tong)的重要作(zuo)用是(shi)保(bao)護電(dian)(dian)(dian)子(zi)設(she)備(bei)免受“浪(lang)涌”的危害,是(shi)以,若是(shi)您想知道電(dian)(dian)(dian)涌保(bao)護器的作(zuo)用,就(jiu)需求弄(nong)領(ling)略兩個題(ti)目:甚么是(shi)浪(lang)涌,電(dian)(dian)(dian)子(zi)設(she)備(bei)為甚么需求它們的保(bao)護。 電(dian)(dian)(dian)涌或(huo)瞬變(bian)電(dian)(dian)(dian)壓是(shi)指電(dian)(dian)(dian)壓在電(dian)(dian)(dian)能靜止(zhi)的
電(dian)動機綜合保護器(qi)是我(wo)國最(zui)早從(cong)上(shang)個世紀80年代就開始使用了,當時是以(yi)電(dian)子元(yuan)器(qi)件,集(ji)成(cheng)電(dian)路為主,它利用3個電(dian)流(liu)互(hu)感器(qi)檢測出(chu)負載電(dian)流(liu),在電(dian)路中(zhong)進行運算(suan),差值比較和簡單的(de)邏(luo)輯(ji)判斷,在發(fa)生過載,缺相(xiang),斷相(xiang)和
控(kong)制與(yu)(yu)保護(hu)開關電(dian)器(qi)(qi)是80年代(dai)隨著機電(dian)一(yi)體化工業的(de)高速發展(zhan)出(chu)現的(de)一(yi)種新型低壓配電(dian)與(yu)(yu)電(dian)機控(kong)制系統中的(de)集成(cheng)化電(dian)器(qi)(qi),將過去斷路器(qi)(qi),接觸器(qi)(qi),熱(re)繼電(dian)器(qi)(qi)以及隔離(li)器(qi)(qi)的(de)控(kong)制與(yu)(yu)保護(hu)功能集于一(yi)體,解決了各電(dian)器(qi)(qi)之間(jian)的(de)協調(diao)
1)SPD的(de)電(dian)壓(ya)(ya)保護水(shui)平Up應不斷小于(yu)被保護設備(bei)的(de)襲擊(ji)耐(nai)受電(dian)壓(ya)(ya)Uchoc,并且大于(yu)按照接地類型得出的(de)電(dian)網(wang)最(zui)高運轉電(dian)壓(ya)(ya)Usmax,即Usmax。 (2)SPD與(yu)被保護設備(bei)兩端引線(xian)應盡也許短,掌握(wo)在
理想的(de)(de)電(dian)動(dong)機保護器不是(shi)功能(neng)(neng)最(zui)(zui)多,也不是(shi)所謂最(zui)(zui)先進的(de)(de),而(er)是(shi)應(ying)該最(zui)(zui)實用的(de)(de),那么何(he)為可靠(kao)(kao)呢,可靠(kao)(kao)首先應(ying)滿(man)足(zu)功能(neng)(neng)的(de)(de)可靠(kao)(kao),如(ru)過(guo)(guo)電(dian)流(liu),斷相(xiang)功能(neng)(neng)必須對各種場合,各種過(guo)(guo)程,各種方(fang)式發(fa)生的(de)(de)過(guo)(guo)電(dian)流(liu),斷相(xiang)均能(neng)(neng)可靠(kao)(kao)的(de)(de)動(dong)作