LED顯示(shi)屏頻繁(fan)跳閘(zha)(zha)的情況，好多人都(dou)遇到(dao)(dao)過(guo)，咱們(men)也(ye)曾(ceng)經(jing)不止一次的說過(guo)安防系統里(li)，空開經(jing)常跳閘(zha)(zha)的問題，那么(me)這到(dao)(dao)底是為什么(me)?

      1.漏(lou)電保護器布局不合理    　　

      由于LED顯(xian)示屏安裝現場所具有(you)的(de)特殊性，如接線(xian)錯誤(wu)、線(xian)路破損、開(kai)關(guan)箱內漏電(dian)保(bao)(bao)護(hu)(hu)器損壞(huai)、部(bu)分(fen)用(yong)電(dian)器具沒(mei)有(you)經(jing)過開(kai)關(guan)箱等原(yuan)因，以及漏電(dian)保(bao)(bao)護(hu)(hu)器本(ben)身不(bu)可避免的(de)誤(wu)動和拒(ju)動，再加上沒(mei)有(you)按照實(shi)際用(yong)電(dian)情(qing)況對漏電(dian)保(bao)(bao)護(hu)(hu)器進行布置，造成了總漏電(dian)保(bao)(bao)護(hu)(hu)器頻繁跳閘。

      對(dui)于這種情(qing)況除了加強管理外，還需要從技術的(de)(de)(de)角度，根(gen)據(ju)實(shi)際情(qing)況對(dui)漏(lou)(lou)電(dian)(dian)(dian)保(bao)(bao)護(hu)(hu)(hu)器進(jin)(jin)行合理布置(zhi)。進(jin)(jin)線總(zong)電(dian)(dian)(dian)源上的(de)(de)(de)漏(lou)(lou)電(dian)(dian)(dian)保(bao)(bao)護(hu)(hu)(hu)器，可(ke)主要做(zuo)為防止電(dian)(dian)(dian)氣火災(zai)隱患和電(dian)(dian)(dian)氣短路(lu)的(de)(de)(de)總(zong)保(bao)(bao)護(hu)(hu)(hu)，兼(jian)做(zuo)每個(ge)小(xiao)的(de)(de)(de)漏(lou)(lou)電(dian)(dian)(dian)保(bao)(bao)護(hu)(hu)(hu)范(fan)圍(wei)的(de)(de)(de)后備保(bao)(bao)護(hu)(hu)(hu)，它的(de)(de)(de)額定(ding)漏(lou)(lou)電(dian)(dian)(dian)動作(zuo)電(dian)(dian)(dian)流可(ke)在200～500mA之間選(xuan)(xuan)擇，額定(ding)漏(lou)(lou)電(dian)(dian)(dian)動作(zuo)時(shi)間可(ke)選(xuan)(xuan)擇0.2~0.3s。這樣，可(ke)極大(da)地減少(shao)浪涌(yong)電(dian)(dian)(dian)壓、浪涌(yong)電(dian)(dian)(dian)流、電(dian)(dian)(dian)磁(ci)干擾(rao)對(dui)總(zong)漏(lou)(lou)電(dian)(dian)(dian)保(bao)(bao)護(hu)(hu)(hu)器的(de)(de)(de)影響，提高(gao)總(zong)漏(lou)(lou)電(dian)(dian)(dian)保(bao)(bao)護(hu)(hu)(hu)器動作(zuo)的(de)(de)(de)選(xuan)(xuan)擇性(xing)和可(ke)靠性(xing)。如(ru)果能使每個(ge)漏(lou)(lou)電(dian)(dian)(dian)保(bao)(bao)護(hu)(hu)(hu)范(fan)圍(wei)內的(de)(de)(de)二級(ji)漏(lou)(lou)電(dian)(dian)(dian)保(bao)(bao)護(hu)(hu)(hu)處于有(you)效保(bao)(bao)護(hu)(hu)(hu)狀(zhuang)態，就可(ke)以大(da)大(da)地減少(shao)工地總(zong)漏(lou)(lou)電(dian)(dian)(dian)保(bao)(bao)護(hu)(hu)(hu)器的(de)(de)(de)頻繁跳(tiao)閘機率。       

      在保護范圍(wei)內沒有形(xing)成(cheng)有效的二(er)級或三級漏電保護   　　

      開關(guan)箱內(nei)的(de)(de)末(mo)級漏電(dian)(dian)保(bao)(bao)(bao)護(hu)(hu)(hu)(hu)器(qi)(qi)(qi)是(shi)用電(dian)(dian)設備的(de)(de)主保(bao)(bao)(bao)護(hu)(hu)(hu)(hu)，如果末(mo)級漏電(dian)(dian)保(bao)(bao)(bao)護(hu)(hu)(hu)(hu)器(qi)(qi)(qi)不(bu)裝、損壞(huai)或選(xuan)型不(bu)當，將可(ke)能導(dao)(dao)致上級漏電(dian)(dian)保(bao)(bao)(bao)護(hu)(hu)(hu)(hu)器(qi)(qi)(qi)頻(pin)繁跳閘。由于(yu)led鏡子屏(ping)內(nei)金(jin)屬導(dao)(dao)體很(hen)(hen)多(duo)，電(dian)(dian)線接頭較多(duo)，如果導(dao)(dao)線絕緣不(bu)是(shi)很(hen)(hen)好，就(jiu)會導(dao)(dao)致經常漏電(dian)(dian)的(de)(de)狀況;有的(de)(de)還加了一些插座，在(zai)很(hen)(hen)多(duo)時候都不(bu)裝漏電(dian)(dian)保(bao)(bao)(bao)護(hu)(hu)(hu)(hu)器(qi)(qi)(qi)，經常造成漏電(dian)(dian)。只有在(zai)每(mei)個保(bao)(bao)(bao)護(hu)(hu)(hu)(hu)范圍內(nei)形成有效的(de)(de)二(er)級或三級漏電(dian)(dian)保(bao)(bao)(bao)護(hu)(hu)(hu)(hu)模式(shi)，才能有效地(di)減少漏電(dian)(dian)保(bao)(bao)(bao)護(hu)(hu)(hu)(hu)器(qi)(qi)(qi)的(de)(de)頻(pin)繁跳閘。   　

      2.漏電(dian)保護器本身有(you)一定(ding)的局限性    　　

      (1)目前的(de)(de)(de)(de)(de)漏(lou)(lou)電(dian)保護(hu)(hu)器(qi)(qi)，不論(lun)是電(dian)磁(ci)(ci)型還是電(dian)子型均(jun)采用(yong)(yong)磁(ci)(ci)感應(ying)電(dian)壓互感器(qi)(qi)拾取用(yong)(yong)電(dian)設備(bei)主回路(lu)中的(de)(de)(de)(de)(de)漏(lou)(lou)電(dian)流，三(san)相(xiang)或(huo)三(san)相(xiang)四線(xian)在磁(ci)(ci)環(huan)中不可能布置完(wan)全(quan)均(jun)衡。LED顯示屏的(de)(de)(de)(de)(de)三(san)相(xiang)用(yong)(yong)電(dian)負(fu)荷也不可能完(wan)全(quan)平衡，在大(da)(da)電(dian)流下或(huo)較(jiao)高的(de)(de)(de)(de)(de)過電(dian)壓下，會在有(you)很高導(dao)磁(ci)(ci)率(lv)的(de)(de)(de)(de)(de)磁(ci)(ci)環(huan)中感應(ying)出(chu)一(yi)定(ding)的(de)(de)(de)(de)(de)電(dian)動(dong)勢，這(zhe)個電(dian)動(dong)勢大(da)(da)到一(yi)定(ding)程度，就會導(dao)致漏(lou)(lou)電(dian)保護(hu)(hu)器(qi)(qi)跳閘。由于額定(ding)電(dian)流越大(da)(da)的(de)(de)(de)(de)(de)漏(lou)(lou)電(dian)保護(hu)(hu)器(qi)(qi)采用(yong)(yong)相(xiang)對較(jiao)大(da)(da)的(de)(de)(de)(de)(de)磁(ci)(ci)環(huan)，產生(sheng)的(de)(de)(de)(de)(de)漏(lou)(lou)磁(ci)(ci)通(tong)也相(xiang)對較(jiao)大(da)(da)，且(qie)漏(lou)(lou)電(dian)流要克(ke)服(fu)磁(ci)(ci)環(huan)本身的(de)(de)(de)(de)(de)磁(ci)(ci)化力，導(dao)致實際使用(yong)(yong)的(de)(de)(de)(de)(de)漏(lou)(lou)電(dian)保護(hu)(hu)器(qi)(qi)額定(ding)電(dian)流越大(da)(da)，靈(ling)敏(min)度越低，拒動(dong)率(lv)也越大(da)(da)。   　　

      (2)漏電(dian)保護器在(zai)額定漏電(dian)動(dong)作電(dian)流(liu)和(he)額定漏電(dian)不動(dong)作電(dian)流(liu)之間有(you)一段動(dong)作不確定區域，漏電(dian)保護器的(de)漏電(dian)流(liu)在(zai)此區域內波動(dong)時(shi)，可能導(dao)致漏電(dian)保護器無規(gui)律跳閘。

 ;     3.漏電(dian)保護器選型不合理   　　

      (1)開關(guan)箱內使用(yong)的(de)(de)(de)額(e)定漏電(dian)(dian)(dian)(dian)(dian)動(dong)作電(dian)(dian)(dian)(dian)(dian)流(liu)超過了30mA或者是超過用(yong)電(dian)(dian)(dian)(dian)(dian)設備(bei)額(e)定電(dian)(dian)(dian)(dian)(dian)流(liu)兩倍以上的(de)(de)(de)漏電(dian)(dian)(dian)(dian)(dian)保(bao)(bao)(bao)護(hu)(hu)器(qi)，或是選(xuan)用(yong)了帶延時型的(de)(de)(de)漏電(dian)(dian)(dian)(dian)(dian)保(bao)(bao)(bao)護(hu)(hu)器(qi)，由于額(e)定漏電(dian)(dian)(dian)(dian)(dian)動(dong)作電(dian)(dian)(dian)(dian)(dian)流(liu)的(de)(de)(de)提高或保(bao)(bao)(bao)護(hu)(hu)靈敏度(du)的(de)(de)(de)下降，發生(sheng)漏電(dian)(dian)(dian)(dian)(dian)故障時，末級(ji)漏電(dian)(dian)(dian)(dian)(dian)保(bao)(bao)(bao)護(hu)(hu)器(qi)沒有動(dong)作，上級(ji)漏電(dian)(dian)(dian)(dian)(dian)保(bao)(bao)(bao)護(hu)(hu)器(qi)就(jiu)可能(neng)動(dong)作   　　

      (2)給LED顯(xian)示(shi)屏通電(dian)(dian)時的(de)(de)啟(qi)動電(dian)(dian)流往(wang)往(wang)都(dou)比較大(da)，此(ci)大(da)電(dian)(dian)流可能會使(shi)漏(lou)電(dian)(dian)保護器(qi)(qi)跳閘(zha)。因此(ci)，應盡可能分(fen)批次地(di)給顯(xian)示(shi)屏的(de)(de)箱體上電(dian)(dian)。另外，一般(ban)應選用對浪涌過(guo)電(dian)(dian)壓、過(guo)電(dian)(dian)流不太敏感的(de)(de)電(dian)(dian)磁(ci)型漏(lou)電(dian)(dian)保護器(qi)(qi);或(huo)選用比額(e)定(ding)電(dian)(dian)流大(da)1.5~2倍的(de)(de)電(dian)(dian)子式漏(lou)電(dian)(dian)保護器(qi)(qi)，但(dan)作為末級漏(lou)電(dian)(dian)保護，額(e)定(ding)漏(lou)電(dian)(dian)動作電(dian)(dian)流不應大(da)于30mA。   　　

      總之，漏(lou)電(dian)保(bao)(bao)(bao)(bao)護(hu)(hu)(hu)器(qi)(qi)頻(pin)繁跳閘(zha)(zha)是各(ge)種(zhong)因素綜(zong)合作(zuo)用(yong)的結果，最主要的是要合理布置漏(lou)電(dian)保(bao)(bao)(bao)(bao)護(hu)(hu)(hu)器(qi)(qi)，縮小(xiao)二或三級漏(lou)電(dian)保(bao)(bao)(bao)(bao)護(hu)(hu)(hu)器(qi)(qi)的保(bao)(bao)(bao)(bao)護(hu)(hu)(hu)范(fan)圍，正確選擇漏(lou)電(dian)保(bao)(bao)(bao)(bao)護(hu)(hu)(hu)器(qi)(qi)和(he)接線(xian)，使(shi)每個范(fan)圍內的二或三級漏(lou)電(dian)保(bao)(bao)(bao)(bao)護(hu)(hu)(hu)器(qi)(qi)處(chu)于(yu)有效保(bao)(bao)(bao)(bao)護(hu)(hu)(hu)狀態。另一方(fang)面(mian)就是加(jia)強用(yong)電(dian)管理和(he)通過培訓提(ti)高(gao)用(yong)電(dian)人(ren)員(yuan)的自身素質(zhi)，杜絕非(fei)電(dian)工(gong)接線(xian)，這樣(yang)就可以既提(ti)高(gao)用(yong)電(dian)的安全性(xing)，又可以減(jian)少漏(lou)電(dian)保(bao)(bao)(bao)(bao)護(hu)(hu)(hu)器(qi)(qi)的頻(pin)繁跳閘(zha)(zha)，給led屏幕的正常的工(gong)作(zuo)創造較好(hao)的供(gong)電(dian)條件。