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电力电缆的敷设和验收技巧新技术

文章(zhang)出处(chu):人气:6发(fa)表时间:2022-09-26 11:40:23

电(dian)力电(dian)缆是电(dian)力施工中必不可(ke)少(shao)的(de)(de)导电(dian)材料。将一根(gen)或(huo)数根(gen)导线绞合而成的(de)(de)线芯(xin),裹以相应的(de)(de)绝缘层以后(hou),外面包(bao)上密(mi)封包(bao)皮(铝、铅、 橡胶或(huo)塑料等),这种导线称为电(dian)缆。

  目前常用电(dian)缆(lan)(lan)的(de)种类很(hen)多,分单芯(xin)电(dian)缆(lan)(lan)和多芯(xin)电(dian)缆(lan)(lan),电(dian)工常用的(de)电(dian)缆(lan)(lan)有电(dian)力电(dian)缆(lan)(lan)和控(kong)制电(dian)缆(lan)(lan)。

  电(dian)(dian)(dian)(dian)(dian)力(li)(li)电(dian)(dian)(dian)(dian)(dian)缆(lan)(lan)是(shi)用(yong)(yong)来(lai)输送和(he)分配大功率电(dian)(dian)(dian)(dian)(dian)能的,按其所采用(yong)(yong)的绝(jue)缘(yuan)材料(liao)不同可分为油浸纸绝(jue) 缘(yuan)电(dian)(dian)(dian)(dian)(dian)力(li)(li)电(dian)(dian)(dian)(dian)(dian)缆(lan)(lan)、橡皮绝(jue)缘(yuan)电(dian)(dian)(dian)(dian)(dian)力(li)(li)电(dian)(dian)(dian)(dian)(dian)缆(lan)(lan)和(he)聚瓠乙(yi)烯电(dian)(dian)(dian)(dian)(dian)力(li)(li)电(dian)(dian)(dian)(dian)(dian)缆(lan)(lan)之类(lei)。电(dian)(dian)(dian)(dian)(dian)力(li)(li)电(dian)(dian)(dian)(dian)(dian)缆(lan)(lan)的剖面如图(tu)12—18所示, 控(kong)制(zhi)(zhi)电(dian)(dian)(dian)(dian)(dian)缆(lan)(lan)是(shi)配电(dian)(dian)(dian)(dian)(dian)装置中传导操作电(dian)(dian)(dian)(dian)(dian)流,连接电(dian)(dian)(dian)(dian)(dian)气(qi)仪表、继电(dian)(dian)(dian)(dian)(dian)保护和(he)自动(dong)控(kong)制(zhi)(zhi)等(deng)回(hui)路用(yong)(yong)的, 它属干低压电(dian)(dian)(dian)(dian)(dian)力(li)(li)电(dian)(dian)(dian)(dian)(dian)缆(lan)(lan),运(yun)行电(dian)(dian)(dian)(dian)(dian)压一(yi)般在交流500伏(fu)(fu)或直流1000伏(fu)(fu)以下(xia),截面积一(yi)般为1. 5〜 10平(ping)方毫米(mi),均(jun)为多芯电(dian)(dian)(dian)(dian)(dian)缆(lan)(lan).芯线数从4芯到37芯。控(kong)制(zhi)(zhi)电(dian)(dian)(dian)(dian)(dian)缆(lan)(lan)的剖面如图(tu)下(xia)图(tu)所示。

电缆剖切图.jpg

1、电(dian)缆(lan)(lan)敷(fu)设前(qian)的检查工作: 电(dian)缆(lan)(lan)敷(fu)设前(qian),应(ying)查核电(dian)缆(lan)(lan)的型(xing)号(hao)、规(gui)格,并检查有无(wu)机械损(sun)伤及受潮(chao), 对于6〜10千伏电(dian)缆(lan)(lan),用2500伏摇表(biao)(biao)测(ce)量,每千米电(dian)缆(lan)(lan)的绝缘(yuan)电(dian)阻(zu)(zu)(20C时)不(bu)低(di)(di)于100兆欧(ou);3千伏及以下的电(dian)缆(lan)(lan)用1000伏摇表(biao)(biao)测(ce)量,每千米电(dian)缆(lan)(lan)的绝缘(yuan)电(dian)阻(zu)(zu)不(bu)低(di)(di)于50兆欧(ou)。

2、电缆敷设方(fang)式技巧

  直接(jie)埋地敷设 按施(shi)工(gong)图要求(qiu)在地面用白粉划出电(dian)缆(lan)敷设的(de)路径(jing)和沟的(de)宽(kuan)度,然后按电(dian)缆(lan)的(de)敷设方法(fa)和埋深要求(qiu)挖(wa)沟。

电缆沟断面示意图.jpg

  直接埋(mai)地(di)敷(fu)设是在地(di)面上挖一条深度为(wei)0.8米(mi)以(yi)(yi)(yi)(yi)上的(de)(de)沟(gou)(gou)(gou),沟(gou)(gou)(gou)宽应(ying)(ying)视电(dian)缆(lan)的(de)(de)数量而定(ding).一般取600毫米(mi)左右.10千伏以(yi)(yi)(yi)(yi)下(xia)的(de)(de)电(dian)缆(lan),相互的(de)(de)间隔要(yao)保(bao)证在100毫米(mi)以(yi)(yi)(yi)(yi)上,每增加(jia)一根(gen)电(dian)缆(lan).沟(gou)(gou)(gou)宽加(jia)大170〜180毫米(mi),电(dian)缆(lan)沟(gou)(gou)(gou)的(de)(de)横断面呈(cheng)上宽(比沟(gou)(gou)(gou)底宽200毫米(mi))、下(xia)窄(zhai)形状,如图所示.沟(gou)(gou)(gou)底应(ying)(ying)平整(zheng),清除石块后,铺上100毫米(mi)厚筛过的(de)(de)松土(tu)或细(xi)沙土(tu),作为(wei)电(dian)缆(lan)的(de)(de)垫层。电(dian)缆(lan)应(ying)(ying)松池地(di)敷(fu)在沟(gou)(gou)(gou)底,以(yi)(yi)(yi)(yi)便(bian)伸(shen)缩。

电缆沟现场施工标准.jpg

然后连接(jie)中间(jian)(jian)和(he)终端接(jie)头(tou),在(zai)(zai)电(dian)(dian)缆(lan)(lan)上(shang)面(mian)再铺上(shang) 100毫(hao)米(mi)(mi)厚的软土(tu)或砂(sha)层,盖上(shang)混凝(ning)(ning)土(tu)或水泥保护板覆盖宽度应超过电(dian)(dian)缆(lan)(lan)直(zhi)径(jing)两(liang)侧50毫(hao)米(mi)(mi),最后在(zai)(zai)电(dian)(dian)缆(lan)(lan)沟内(nei)填土(tu).覆土(tu)要高于地面(mian)150〜200毫(hao)米(mi)(mi),并在(zai)(zai)电(dian)(dian)缆(lan)(lan)线(xian)路的两(liang)端、转弯处和(he)中间(jian)(jian)接(jie)头(tou)处均就竖立一根露出地面(mian)的混凝(ning)(ning)土(tu)标示桩,在(zai)(zai)标示桩上(shang)注明电(dian)(dian)缆(lan)(lan)的型号、规格、敷设日(ri)期和(he)线(xian)路走向等,以便日(ri)后检修。


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