什么是三相五線?什么是三相四線?
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來源:金環宇電線發布日期:2020-05-04 11:52
很多電工跟采購說我要三相五線或三相四線的電纜線,但是真正采購就不是很清楚是要硬的還是軟,里面的線芯顏色又代表什么?就有很大可能買錯線材,今天金環宇電線電纜小編為(wei)您(nin)普及一(yi)下三(san)相(xiang)五線或三(san)相(xiang)四線代表什(shen)么意思?
什(shen)么是(shi)三(san)相五線(xian)?三(san)相五線(xian)包括三(san)相電(dian)的(de)三(san)個(ge)相線(xian)(A、B、C線(xian))為火線(xian),一般代(dai)表(biao)(biao)的(de)線(xian)芯顏色是(shi)紅,綠,黃三(san)種,中性線(xian)(N)稱工作零線(xian)(一般線(xian)芯顏色代(dai)表(biao)(biao)藍或黑(hei));以及(ji)地線(xian)(PE)也稱作保護零線(xian),相當(dang)于(yu)3+2芯電(dian)纜線(xian)或電(dian)纜,使整個(ge)電(dian)路(lu)處于(yu)安全(quan)范圍內,在電(dian)氣裝置的(de)接地系統中三(san)相五線(xian)制稱為TN-S系統,地線(xian)只在供電(dian)變(bian)壓(ya)器側和(he)中性線(xian)接到(dao)一起并且做(zuo)重復接地,之后(hou)在全(quan)系統內N線(xian)和(he)PE線(xian)是(shi)分開的(de)。
什么是三(san)相(xiang)(xiang)四(si)線(xian)(xian)(xian)(xian)?不明思議就是要比三(san)相(xiang)(xiang)五線(xian)(xian)(xian)(xian)少一根(gen)(gen)電(dian)(dian)線(xian)(xian)(xian)(xian),三(san)相(xiang)(xiang)電(dian)(dian)的三(san)個(ge)相(xiang)(xiang)線(xian)(xian)(xian)(xian)(A、B、C線(xian)(xian)(xian)(xian))為(wei)火線(xian)(xian)(xian)(xian)加一根(gen)(gen)零線(xian)(xian)(xian)(xian),相(xiang)(xiang)當(dang)于3+1芯電(dian)(dian)纜線(xian)(xian)(xian)(xian)或電(dian)(dian)纜,三(san)相(xiang)(xiang)就是工(gong)廠電(dian)(dian)路也(ye)可(ke)稱工(gong)程電(dian)(dian)路,它根(gen)(gen)據場合需(xu)要有3線(xian)(xian)(xian)(xian),4線(xian)(xian)(xian)(xian)和5線(xian)(xian)(xian)(xian)幾種方式:
三線----------3根(gen)火線(沒有零線N和接地(di)線PE)
四線----------3根火線+1根零線N (TN-C系統(tong))
五(wu)線(xian)(xian)----------3根(gen)火線(xian)(xian)+1根(gen)零線(xian)(xian)N+1根(gen)接地線(xian)(xian)PE (TN-S系統(tong))
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