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　　由于配電箱LED全(quan)彩顯示屏(ping)安裝現(xian)場所具有(you)的特殊性，如(ru)接(jie)線錯誤、線路破損(sun)、開(kai)關箱(xiang)內漏(lou)電(dian)保(bao)護(hu)器損(sun)壞、部(bu)分用電(dian)器具沒有(you)經(jing)過開(kai)關箱(xiang)等原因(yin)，以及漏(lou)電(dian)保(bao)護(hu)器本身不可避免的誤動和拒(ju)動，再加上(shang)沒有(you)按照(zhao)實際(ji)用電(dian)情況對漏(lou)電(dian)保(bao)護(hu)器進行布置，造成了總漏(lou)電(dian)保(bao)護(hu)器頻繁跳閘。

　　對(dui)于(yu)這(zhe)種情(qing)況視爵(jue)光電(dian)(dian)除了加強管理(li)外，還需(xu)要從技術(shu)的(de)(de)角度，根(gen)據實際情(qing)況對(dui)漏(lou)(lou)電(dian)(dian)保護(hu)(hu)(hu)器(qi)(qi)進行合理(li)布置。進線總(zong)(zong)電(dian)(dian)源上的(de)(de)漏(lou)(lou)電(dian)(dian)保護(hu)(hu)(hu)器(qi)(qi)，可(ke)主要做(zuo)為防止電(dian)(dian)氣(qi)(qi)火災(zai)隱患(huan)和電(dian)(dian)氣(qi)(qi)短路的(de)(de)總(zong)(zong)保護(hu)(hu)(hu)，兼做(zuo)每個小的(de)(de)漏(lou)(lou)電(dian)(dian)保護(hu)(hu)(hu)范圍(wei)的(de)(de)后備(bei)保護(hu)(hu)(hu)，它的(de)(de)額定(ding)漏(lou)(lou)電(dian)(dian)動作(zuo)電(dian)(dian)流可(ke)在200～500mA之間(jian)選(xuan)擇(ze)，額定(ding)漏(lou)(lou)電(dian)(dian)動作(zuo)時間(jian)可(ke)選(xuan)擇(ze)0.2~0.3s。這(zhe)樣，可(ke)極大地減少浪涌電(dian)(dian)壓、浪涌電(dian)(dian)流、電(dian)(dian)磁干擾對(dui)總(zong)(zong)漏(lou)(lou)電(dian)(dian)保護(hu)(hu)(hu)器(qi)(qi)的(de)(de)影響(xiang)，提高總(zong)(zong)漏(lou)(lou)電(dian)(dian)保護(hu)(hu)(hu)器(qi)(qi)動作(zuo)的(de)(de)選(xuan)擇(ze)性(xing)和可(ke)靠性(xing)。如(ru)果能使(shi)每個漏(lou)(lou)電(dian)(dian)保護(hu)(hu)(hu)范圍(wei)內的(de)(de)二級漏(lou)(lou)電(dian)(dian)保護(hu)(hu)(hu)處于(yu)有效保護(hu)(hu)(hu)狀態，就可(ke)以大大地減少工地總(zong)(zong)漏(lou)(lou)電(dian)(dian)保護(hu)(hu)(hu)器(qi)(qi)的(de)(de)頻繁跳閘機率。

　　2、在保護范圍內沒有形成有效的二級或三級漏電保護

　　開(kai)關箱(xiang)內(nei)的末(mo)(mo)級(ji)(ji)漏(lou)(lou)電(dian)(dian)保(bao)(bao)護(hu)器(qi)是用電(dian)(dian)設備的主保(bao)(bao)護(hu)，如果末(mo)(mo)級(ji)(ji)漏(lou)(lou)電(dian)(dian)保(bao)(bao)護(hu)器(qi)不(bu)(bu)(bu)裝(zhuang)、損壞或選型不(bu)(bu)(bu)當，將可能導致(zhi)上級(ji)(ji)漏(lou)(lou)電(dian)(dian)保(bao)(bao)護(hu)器(qi)頻(pin)繁(fan)跳閘(zha)。由于LED全彩顯示屏內(nei)金屬導體很多，電(dian)(dian)線接頭較多，如果導線絕緣不(bu)(bu)(bu)是很好(hao)，就會導致(zhi)經常(chang)(chang)漏(lou)(lou)電(dian)(dian)的狀況；有的還加了一些插(cha)座，在(zai)很多時(shi)候都不(bu)(bu)(bu)裝(zhuang)漏(lou)(lou)電(dian)(dian)保(bao)(bao)護(hu)器(qi)，經常(chang)(chang)造成漏(lou)(lou)電(dian)(dian)。

　　3、漏電保護器本身有一定的局限性(三相電用電不平衡)

　　目前的(de)(de)(de)(de)漏(lou)電(dian)(dian)(dian)(dian)保護(hu)器(qi)(qi)，不(bu)論是(shi)電(dian)(dian)(dian)(dian)磁(ci)型(xing)還(huan)是(shi)電(dian)(dian)(dian)(dian)子型(xing)均(jun)采(cai)(cai)用(yong)磁(ci)感應電(dian)(dian)(dian)(dian)壓互感器(qi)(qi)拾取(qu)用(yong)電(dian)(dian)(dian)(dian)設備主(zhu)回路中(zhong)的(de)(de)(de)(de)漏(lou)電(dian)(dian)(dian)(dian)流(liu)(liu)，三(san)相(xiang)或三(san)相(xiang)四線(xian)在(zai)磁(ci)環中(zhong)不(bu)可(ke)能布置完全均(jun)衡。LED全彩(cai)電(dian)(dian)(dian)(dian)子顯示(shi)屏的(de)(de)(de)(de)三(san)相(xiang)用(yong)電(dian)(dian)(dian)(dian)負荷也不(bu)可(ke)能完全平衡，在(zai)大(da)電(dian)(dian)(dian)(dian)流(liu)(liu)下(xia)或較(jiao)高(gao)的(de)(de)(de)(de)過電(dian)(dian)(dian)(dian)壓下(xia)，會在(zai)有很高(gao)導磁(ci)率的(de)(de)(de)(de)磁(ci)環中(zhong)感應出一定的(de)(de)(de)(de)電(dian)(dian)(dian)(dian)動勢，這(zhe)個(ge)電(dian)(dian)(dian)(dian)動勢大(da)到一定程度，就會導致(zhi)漏(lou)電(dian)(dian)(dian)(dian)保護(hu)器(qi)(qi)跳閘。由于額定電(dian)(dian)(dian)(dian)流(liu)(liu)越(yue)大(da)的(de)(de)(de)(de)漏(lou)電(dian)(dian)(dian)(dian)保護(hu)器(qi)(qi)采(cai)(cai)用(yong)相(xiang)對較(jiao)大(da)的(de)(de)(de)(de)磁(ci)環，產(chan)生(sheng)的(de)(de)(de)(de)漏(lou)磁(ci)通也相(xiang)對較(jiao)大(da)，且漏(lou)電(dian)(dian)(dian)(dian)流(liu)(liu)要(yao)克服磁(ci)環本身的(de)(de)(de)(de)磁(ci)化(hua)力，導致(zhi)實(shi)際使用(yong)的(de)(de)(de)(de)漏(lou)電(dian)(dian)(dian)(dian)保護(hu)器(qi)(qi)額定電(dian)(dian)(dian)(dian)流(liu)(liu)越(yue)大(da)，靈敏度越(yue)低，拒動率也越(yue)大(da)。

　　漏電(dian)保(bao)護器在(zai)額(e)(e)定漏電(dian)動(dong)作(zuo)電(dian)流和額(e)(e)定漏電(dian)不(bu)動(dong)作(zuo)電(dian)流之間有一段(duan)動(dong)作(zuo)不(bu)確定區域，漏電(dian)保(bao)護器的(de)漏電(dian)流在(zai)此區域內波動(dong)時，可(ke)能導致漏電(dian)保(bao)護器無規律跳閘。

　　4、漏電保護器選型不合理

　　開關箱(xiang)內(nei)使用(yong)的(de)額定漏(lou)(lou)(lou)電(dian)(dian)(dian)動(dong)作(zuo)(zuo)電(dian)(dian)(dian)流超(chao)過了30mA或者是超(chao)過用(yong)電(dian)(dian)(dian)設備額定電(dian)(dian)(dian)流兩倍以上(shang)的(de)漏(lou)(lou)(lou)電(dian)(dian)(dian)保護(hu)(hu)(hu)(hu)器(qi)，或是選用(yong)了帶延時(shi)型的(de)漏(lou)(lou)(lou)電(dian)(dian)(dian)保護(hu)(hu)(hu)(hu)器(qi)，由于額定漏(lou)(lou)(lou)電(dian)(dian)(dian)動(dong)作(zuo)(zuo)電(dian)(dian)(dian)流的(de)提高(gao)或保護(hu)(hu)(hu)(hu)靈(ling)敏度的(de)下降，發(fa)生漏(lou)(lou)(lou)電(dian)(dian)(dian)故障時(shi)，末級漏(lou)(lou)(lou)電(dian)(dian)(dian)保護(hu)(hu)(hu)(hu)器(qi)沒有(you)動(dong)作(zuo)(zuo)，上(shang)級漏(lou)(lou)(lou)電(dian)(dian)(dian)保護(hu)(hu)(hu)(hu)器(qi)就(jiu)可能動(dong)作(zuo)(zuo)。

　　視爵(jue)光電(dian)(dian)(dian)(dian)(dian)提醒(xing)在給LED大(da)(da)屏(ping)(ping)幕通電(dian)(dian)(dian)(dian)(dian)時的(de)(de)啟動(dong)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)往(wang)往(wang)都比(bi)(bi)較大(da)(da)，此大(da)(da)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)可(ke)能會使漏(lou)(lou)(lou)電(dian)(dian)(dian)(dian)(dian)保(bao)(bao)護(hu)(hu)器跳閘。因此，應盡可(ke)能分(fen)批次地給顯示屏(ping)(ping)的(de)(de)箱體上電(dian)(dian)(dian)(dian)(dian)。另外，一(yi)般應選用對浪(lang)涌過(guo)電(dian)(dian)(dian)(dian)(dian)壓、過(guo)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)不(bu)太敏感的(de)(de)電(dian)(dian)(dian)(dian)(dian)磁型漏(lou)(lou)(lou)電(dian)(dian)(dian)(dian)(dian)保(bao)(bao)護(hu)(hu)器；或選用比(bi)(bi)額(e)定電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)大(da)(da)1.5~2倍的(de)(de)電(dian)(dian)(dian)(dian)(dian)子式漏(lou)(lou)(lou)電(dian)(dian)(dian)(dian)(dian)保(bao)(bao)護(hu)(hu)器，但作為(wei)末(mo)級漏(lou)(lou)(lou)電(dian)(dian)(dian)(dian)(dian)保(bao)(bao)護(hu)(hu)，額(e)定漏(lou)(lou)(lou)電(dian)(dian)(dian)(dian)(dian)動(dong)作電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)不(bu)應大(da)(da)于30mA。