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漳州小型電梯疑問為什么電梯不接漏電保護開關?

瀏覽次數: 發布時間:2018-6-24 9:49:45 【

    首先(xian)有必要(yao)對漏電保護(hu)開關(guan)的原理進行(xing)說明:
    漏(lou)(lou)(lou)電(dian)(dian)(dian)(dian)保(bao)護開(kai)關是取漏(lou)(lou)(lou)電(dian)(dian)(dian)(dian)為動(dong)作(zuo)信(xin)號,并在一(yi)定的漏(lou)(lou)(lou)電(dian)(dian)(dian)(dian)條(tiao)件下切斷漏(lou)(lou)(lou)電(dian)(dian)(dian)(dian)線路(lu)(lu),以免傷(shang)及人(ren)身和(he)(he)燒毀設備的裝(zhuang)置。漏(lou)(lou)(lou)電(dian)(dian)(dian)(dian)保(bao)護開(kai)關通常(chang)和(he)(he)短路(lu)(lu)、過載等(deng)(deng)保(bao)護元組(zu)件裝(zhuang)在一(yi)起,常(chang)有電(dian)(dian)(dian)(dian)壓型(xing)和(he)(he)電(dian)(dian)(dian)(dian)流(liu)型(xing)漏(lou)(lou)(lou)電(dian)(dian)(dian)(dian)保(bao)護開(kai)關之分。漏(lou)(lou)(lou)電(dian)(dian)(dian)(dian)保(bao)護器(qi)(qi)的工作(zuo)原理是根據“電(dian)(dian)(dian)(dian)流(liu)平(ping)衡原理”來(lai)動(dong)作(zuo)的,當電(dian)(dian)(dian)(dian)路(lu)(lu)正常(chang)工作(zuo)時,相線電(dian)(dian)(dian)(dian)流(liu)和(he)(he)中(zhong)(zhong)線電(dian)(dian)(dian)(dian)流(liu)相等(deng)(deng),電(dian)(dian)(dian)(dian)流(liu)向(xiang)量總(zong)和(he)(he)等(deng)(deng)于(yu)零(ling),電(dian)(dian)(dian)(dian)流(liu)互(hu)感(gan)器(qi)(qi)鐵芯中(zhong)(zhong)感(gan)應的磁通向(xiang)量和(he)(he)也等(deng)(deng)于(yu)零(ling),這時由于(yu)電(dian)(dian)(dian)(dian)流(liu)互(hu)感(gan)器(qi)(qi)二(er)次側繞(rao)(rao)組(zu)元信(xin)號輸出(chu),漏(lou)(lou)(lou)電(dian)(dian)(dian)(dian)保(bao)護器(qi)(qi)脫(tuo)扣(kou)器(qi)(qi)不動(dong)作(zuo),電(dian)(dian)(dian)(dian)路(lu)(lu)正常(chang)供(gong)電(dian)(dian)(dian)(dian)。但(dan)當電(dian)(dian)(dian)(dian)路(lu)(lu)發生(sheng)故(gu)障或絕緣(yuan)破損(sun)漏(lou)(lou)(lou)電(dian)(dian)(dian)(dian)時,電(dian)(dian)(dian)(dian)流(liu)向(xiang)量總(zong)和(he)(he)不等(deng)(deng)于(yu)零(ling),電(dian)(dian)(dian)(dian)流(liu)互(hu)感(gan)器(qi)(qi)鐵芯中(zhong)(zhong)感(gan)應的磁通使得二(er)次側繞(rao)(rao)組(zu)產(chan)生(sheng)感(gan)應電(dian)(dian)(dian)(dian)壓,當故(gu)障電(dian)(dian)(dian)(dian)流(liu)達到一(yi)定值時,感(gan)應電(dian)(dian)(dian)(dian)壓使漏(lou)(lou)(lou)電(dian)(dian)(dian)(dian)保(bao)護器(qi)(qi)脫(tuo)扣(kou)器(qi)(qi)動(dong)作(zuo)。
    而對于電(dian)梯來講:
    其一:在電機啟動時無(wu)法(fa)做到(dao)在啟動時保(bao)持三相電流平衡,因此電流向量總和不(bu)等于零從而造成漏電保(bao)護(hu)開關動作。
    第(di)二:對變頻控制的電(dian)梯,在啟動時為保護(hu)變頻器支流環(huan),通常(chang)會采(cai)用二相(xiang)(xiang)降(jiang)壓整流的方式對直(zhi)流環(huan)進行充(chong)電(dian),因此在啟動時只有兩相(xiang)(xiang)有電(dian)流,電(dian)流向量總和(he)不等于零從(cong)而造成漏(lou)電(dian)保護(hu)開關動作。
    第三(san):變頻(pin)器使用中,會(hui)產生電(dian)(dian)(dian)(dian)磁干擾(rao),而在金(jin)(jin)屬殼(ke)體(ti)屏弊后(hou),金(jin)(jin)屬殼(ke)體(ti)就會(hui)對地有(you)電(dian)(dian)(dian)(dian)位(wei)差,所以只有(you)重復接(jie)地最安全,但(dan)重復接(jie)地后(hou),這部(bu)分能量反(fan)應到漏電(dian)(dian)(dian)(dian)上(shang)就是輸入電(dian)(dian)(dian)(dian)流(liu)(liu)輸出電(dian)(dian)(dian)(dian)流(liu)(liu)不(bu)平衡,漏電(dian)(dian)(dian)(dian)開(kai)關只是從電(dian)(dian)(dian)(dian)流(liu)(liu)上(shang)判斷漏電(dian)(dian)(dian)(dian),它不(bu)知(zhi)道變頻(pin)器會(hui)通(tong)(tong)過諧波(電(dian)(dian)(dian)(dian)磁波,寄(ji)生電(dian)(dian)(dian)(dian)容(rong))方(fang)式泄(xie)漏,而泄(xie)漏值又大于普(pu)通(tong)(tong)漏電(dian)(dian)(dian)(dian)的域值,因此在一旦變頻(pin)器開(kai)始工作就會(hui)造成漏電(dian)(dian)(dian)(dian)保護(hu)開(kai)關動(dong)作。
    綜(zong)上所述(shu),在變頻器(qi)(qi)的(de)進線側不能安裝(zhuang)漏電保護(hu)器(qi)(qi),而需要安裝(zhuang)電機(ji)專用的(de)空氣(qi)開關(AD型)。
    下面這個(ge)是一個(ge)發函給(gei)客戶(hu)的簡單解釋格式:
    xx電梯(ti)用戶單位:
    近來,我司在(zai)電(dian)梯(ti)日常實際工(gong)(gong)作工(gong)(gong)碰到部分用戶(hu)在(zai)供給(gei)電(dian)梯(ti)電(dian)源的(de)地路上設置(zhi)漏(lou)電(dian)保(bao)(bao)護開(kai)關(guan),造成電(dian)梯(ti)無法正(zheng)常工(gong)(gong)作的(de)情況,經我司工(gong)(gong)程技(ji)術(shu)人員分析研究任務電(dian)梯(ti)不宜設置(zhi)漏(lou)電(dian)保(bao)(bao)護開(kai)關(guan),說明如下(xia):
    1. 三相漏電(dian)(dian)(dian)(dian)(dian)保護開(kai)關從結構上看(kan)有零(ling)序(xu)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)檢測器(qi),電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)放大(da)器(qi)和電(dian)(dian)(dian)(dian)(dian)磁(ci)脫扣裝置,其(qi)零(ling)序(xu)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)值(zhi)(zhi)等于三相電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)的矢量和。當三相電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)平衡時(shi),零(ling)序(xu)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)值(zhi)(zhi)等于零(ling),當三相電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)不(bu)平衡時(shi),零(ling)序(xu)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)值(zhi)(zhi)不(bu)等于零(ling),當零(ling)序(xu)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)值(zhi)(zhi)達到一定值(zhi)(zhi)是(大(da)于設定值(zhi)(zhi)),經電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)放大(da)器(qi)后推動脫扣器(qi)工作,漏電(dian)(dian)(dian)(dian)(dian)保護開(kai)關就跳(tiao)閘保護。
    2. 目前電(dian)(dian)梯(ti)(ti)產品均采用國際上(shang)最先進的(de)交流(liu)(liu)變(bian)壓(ya)變(bian)頻(pin)(VVVF)調速系(xi)統來(lai)驅動電(dian)(dian)梯(ti)(ti)運(yun)行。由于(yu)(yu)該系(xi)統在(zai)電(dian)(dian)梯(ti)(ti)每(mei)次運(yun)行時首先需對(dui)用戶提供的(de)三(san)相(xiang)電(dian)(dian)梯(ti)(ti)電(dian)(dian)源(yuan)進行整流(liu)(liu)變(bian)成直(zhi)流(liu)(liu)后才(cai)能實施變(bian)壓(ya)變(bian)頻(pin)調速控(kong)制(zhi),因(yin)此在(zai)對(dui)三(san)相(xiang)電(dian)(dian)梯(ti)(ti)電(dian)(dian)源(yuan)進行整流(liu)(liu)過程中,根據整流(liu)(liu)電(dian)(dian)路原理在(zai)三(san)相(xiang)整流(liu)(liu)橋中會(hui)產生(sheng)三(san)相(xiang)平不衡電(dian)(dian)流(liu)(liu),零(ling)序電(dian)(dian)流(liu)(liu)值就不等(deng)于(yu)(yu)零(ling),漏電(dian)(dian)保(bao)護(hu)    開關就跳閘保(bao)護(hu),造成電(dian)(dian)梯(ti)(ti)不能正常(chang)運(yun)行。
綜上說(shuo)訴,電(dian)梯(ti)的供電(dian)電(dian)路均不能安裝漏電(dian)保護開關,否則會(hui)使電(dian)梯(ti)故障頻繁或無(wu)法正常(chang)工作。

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