絕緣(yuan)受潮這(zhe)種情(qing)況也(ye)(ye)很常見，一般發生在直(zhi)埋或排管里(li)的(de)電(dian)(dian)(dian)纜接(jie)(jie)頭處。比如(ru)：電(dian)(dian)(dian)纜接(jie)(jie)頭制作(zuo)不合格和在潮濕(shi)的(de)氣候條件下做接(jie)(jie)頭，會使接(jie)(jie)頭進(jin)水(shui)(shui)或混入水(shui)(shui)蒸氣，時(shi)間久了在電(dian)(dian)(dian)場作(zuo)用下形成(cheng)水(shui)(shui)樹枝(zhi)，逐漸損害電(dian)(dian)(dian)纜的(de)絕緣(yuan)強度而造成(cheng)故障。化(hua)學腐蝕(shi)(shi)電(dian)(dian)(dian)纜直(zhi)接(jie)(jie)埋在有酸(suan)堿(jian)作(zuo)用的(de)地區，往(wang)往(wang)會造成(cheng)電(dian)(dian)(dian)纜的(de)鎧裝、鉛皮或外護層(ceng)被腐蝕(shi)(shi)，保護層(ceng)因長期(qi)遭受化(hua)學腐蝕(shi)(shi)或電(dian)(dian)(dian)解腐蝕(shi)(shi)，致使保護層(ceng)失效(xiao)，絕緣(yuan)降低，也(ye)(ye)會導(dao)致電(dian)(dian)(dian)纜故障。化(hua)：單(dan)位的(de)電(dian)(dian)(dian)纜腐蝕(shi)(shi)情(qing)況就相當嚴重。長期(qi)過負(fu)荷(he)運行超負(fu)荷(he)運行，由于電(dian)(dian)(dian)流的(de)熱(re)效(xiao)應(ying)，負(fu)載電(dian)(dian)(dian)流通過電(dian)(dian)(dian)纜時(shi)必(bi)然導(dao)致導(dao)體(ti)發熱(re)，同(tong)時(shi)電(dian)(dian)(dian)荷(he)的(de)集膚(fu)效(xiao)應(ying)以及鋼鎧的(de)渦流損耗、絕緣(yuan)介質損耗也(ye)(ye)會產乍(zha)附加熱(re)量，從而使電(dian)(dian)(dian)纜溫度升(sheng)高(gao)。長期(qi)超負(fu)荷(he)運行時(shi)，過高(gao)的(de)溫度會加速絕緣(yuan)的(de)老化(hua)，以至絕緣(yuan)被擊穿。

屏蔽電纜KVVP與KVVP2之間的應如何選擇？屏蔽電纜多用在需要進行防干擾進行屏蔽的場合，防干擾的強度不同，所選的屏蔽效果也不同，在控制電纜中，雖然KVVP與KVVP2都屬于屏蔽電纜，但是兩者的屏蔽效果卻是不同，這里分別從含義、本地稀土鋁合金電纜作用簡單介紹下這兩種電纜。電纜的含義KVVP電纜的全稱為銅芯聚氯乙烯絕緣銅絲編織屏蔽聚氯乙烯護套控制電纜。這里的P所表示的是銅絲編織屏蔽。銅絲編織屏蔽是由裸銅絲編織而成，成都稀土鋁合金電纜一般包裹在線纜絕(jue)緣(yuan)與(yu)外護套(tao)之間(jian)用來阻(zu)止干擾信號進(jin)(jin)入(ru)到內部的(de)導體進(jin)(jin)行干擾同時又減(jian)少傳輸(shu)信號的(de)損耗。電(dian)(dian)纜的(de)屏(ping)(ping)(ping)蔽(bi)層(ceng)需(xu)要接入(ru)大(da)地(di)(di)，外部被(bei)屏(ping)(ping)(ping)蔽(bi)層(ceng)截取的(de)干擾信號則(ze)被(bei)導入(ru)大(da)地(di)(di)。KVVP2電(dian)(dian)纜的(de)全稱(cheng)為銅芯聚氯乙(yi)烯(xi)(xi)絕(jue)緣(yuan)銅帶屏(ping)(ping)(ping)蔽(bi)聚氯乙(yi)烯(xi)(xi)護套(tao)控制電(dian)(dian)纜。這(zhe)里的(de)P2表示的(de)是銅帶屏(ping)(ping)(ping)蔽(bi)。

電(dian)(dian)(dian)(dian)(dian)(dian)力電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)是(shi)用(yong)于傳(chuan)輸(shu)和分配(pei)電(dian)(dian)(dian)(dian)(dian)(dian)能的(de)電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)，電(dian)(dian)(dian)(dian)(dian)(dian)力電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)常用(yong)于城市地下(xia)電(dian)(dian)(dian)(dian)(dian)(dian)網(wang)、發電(dian)(dian)(dian)(dian)(dian)(dian)站引出線路(lu)(lu)、工礦企業(ye)內部供電(dian)(dian)(dian)(dian)(dian)(dian)及過(guo)江海水下(xia)輸(shu)電(dian)(dian)(dian)(dian)(dian)(dian)線。在(zai)(zai)電(dian)(dian)(dian)(dian)(dian)(dian)力線路(lu)(lu)中，電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)所占比(bi)重正逐漸增(zeng)加。江西電(dian)(dian)(dian)(dian)(dian)(dian)力電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)是(shi)在(zai)(zai)電(dian)(dian)(dian)(dian)(dian)(dian)力系統(tong)的(de)主干線路(lu)(lu)中用(yong)以(yi)傳(chuan)輸(shu)和分配(pei)大功率電(dian)(dian)(dian)(dian)(dian)(dian)能的(de)電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)產品(pin)，包括1-500KV以(yi)及以(yi)上各種電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)等(deng)級，各種絕(jue)緣(yuan)的(de)電(dian)(dian)(dian)(dian)(dian)(dian)力電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)。通過(guo)一(yi)定(ding)負載電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)時，電(dian)(dian)(dian)(dian)(dian)(dian)力電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)一(yi)定(ding)會發熱(re)，隨著負載電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)的(de)增(zeng)大，電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)表(biao)面(mian)溫度(du)就越(yue)(yue)高(gao)，如果不及時處理(li)，后果可(ke)想而知。如：聚氯乙烯(PVC)電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)，是(shi)以(yi)線芯溫度(du)70度(du)為上限(xian)考慮(lv)的(de)，表(biao)面(mian)溫度(du)會低5～10度(du)。所以(yi)電(dian)(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)(lan)表(biao)面(mian)溫度(du)在(zai)(zai)60度(du)以(yi)下(xia)基本是(shi)安全的(de)，從電(dian)(dian)(dian)(dian)(dian)(dian)源維護考慮(lv)，當然是(shi)溫度(du)越(yue)(yue)低越(yue)(yue)好。

電(dian)線電(dian)纜(lan)(lan)價格 1）敷(fu)設(she)(she)(she)電(dian)纜(lan)(lan)作(zuo)(zuo)業(ye)(ye)應(ying)設(she)(she)(she)專人(ren)(ren)統一(yi)指(zhi)揮。作(zuo)(zuo)業(ye)(ye)前，作(zuo)(zuo)業(ye)(ye)負責(ze)人(ren)(ren)或(huo)總指(zhi)揮應(ying)向(xiang)全體作(zuo)(zuo)業(ye)(ye)人(ren)(ren)員講明作(zuo)(zuo)業(ye)(ye)要求、聯(lian)絡信號及注(zhu)意事項(xiang)。作(zuo)(zuo)業(ye)(ye)人(ren)(ren)員應(ying)分(fen)工明確(que)、相互協作(zuo)(zuo)、盡(jin)心(xin)盡(jin)責(ze)。在(zai)(zai)(zai)居民區及公路(lu)、鐵路(lu)交(jiao)通要道附近作(zuo)(zuo)業(ye)(ye)，要專人(ren)(ren)看管監護，井設(she)(she)(she)“前方施(shi)工、車輛 繞行”標志(zhi)，夜間(jian)應(ying)設(she)(she)(she)紅燈標志(zhi)。（2）電(dian)纜(lan)(lan)敷(fu)設(she)(she)(she)時，應(ying)選擇堅(jian)硬平坦的地面支撐電(dian)纜(lan)(lan)軸(zhou)，使用的 絲杠(gang)千斤支架應(ying)轉動靈活、堅(jian)固且安全可(ke)靠，能(neng)保證(zheng)電(dian)纜(lan)(lan)軸(zhou)架起 落時端面垂直、卷筒水平。電(dian)纜(lan)(lan)軸(zhou)保護板拆除后要集中保管，以(yi)免(mian)釘子(zi)扎傷人(ren)(ren)腳。（3）電(dian)纜(lan)(lan)在(zai)(zai)(zai)溝(gou)內展(zhan)放時，操作(zuo)(zuo)人(ren)(ren)員一(yi)般由(you)手提或(huo)肩扛(kang)將電(dian)纜(lan)(lan)拖到終點，在(zai)(zai)(zai)拐彎(wan)處操作(zuo)(zuo)人(ren)(ren)員必(bi)須(xu)站(zhan)在(zai)(zai)(zai)電(dian)纜(lan)(lan)的外側，以(yi)免(mian)被(bei)電(dian)纜(lan)(lan)掛倒；在(zai)(zai)(zai)墻洞(dong)口(kou)、溝(gou)口(kou)、管口(kou)或(huo)隔層敷(fu)設(she)(she)(she)時，手應(ying)距口(kou)處lin以(yi)上， 以(yi)免(mian)碰(peng)傷手指(zhi)。敷(fu)設(she)(she)(she)電(dian)纜(lan)(lan)必(bi)須(xu)戴(dai)手套。

首先(xian)，產(chan)品的(de)命(ming)名不同(tong)，所代表的(de)含義也不同(tong)：YJV絕(jue)緣用的(de)是交(jiao)聯聚(ju)乙烯.VV絕(jue)緣用的(de)是聚(ju)氯(lv)乙烯.其(qi)次，二(er)者(zhe)在(zai)(zai)生(sheng)產(chan)設備和工藝制造上(shang)也有區別的(de)：VV為(wei)塑力纜(lan)(lan)，YJV即交(jiao)聯電纜(lan)(lan)，其(qi)絕(jue)緣層性能(neng)優于塑力纜(lan)(lan)。YJV只是在(zai)(zai)絕(jue)緣材料上(shang)做了交(jiao)聯處理提高(gao)(gao)(gao)了耐熱溫(wen)度(du)(du)(du)(du)(du),而 VV沒有。YJV電纜(lan)(lan)工作溫(wen)度(du)(du)(du)(du)(du)達90度(du)(du)(du)(du)(du)，而VV只有70度(du)(du)(du)(du)(du)，同(tong)截面積YJV電纜(lan)(lan)載流(liu)量大(da)。VV類電纜(lan)(lan)導體運行(xing)最(zui)(zui)高(gao)(gao)(gao)額定(ding)(ding)溫(wen)度(du)(du)(du)(du)(du)為(wei)攝氏70度(du)(du)(du)(du)(du)，短路(lu)時（持續(xu)時間小于5秒(miao)(miao)）最(zui)(zui)高(gao)(gao)(gao)溫(wen)度(du)(du)(du)(du)(du)不超(chao)過(guo)攝氏160度(du)(du)(du)(du)(du)。YJV類電纜(lan)(lan)導體運行(xing)最(zui)(zui)高(gao)(gao)(gao)額定(ding)(ding)溫(wen)度(du)(du)(du)(du)(du)為(wei)攝氏90度(du)(du)(du)(du)(du)，短路(lu)時（持續(xu)時間小于5秒(miao)(miao)）最(zui)(zui)高(gao)(gao)(gao)溫(wen)度(du)(du)(du)(du)(du)不超(chao)過(guo)攝氏250度(du)(du)(du)(du)(du)。YJV從長遠(yuan)看(kan)比(bi)VV好（使用壽命(ming)長等），但比(bi)VV貴。從短路(lu)允(yun)許的(de)最(zui)(zui)高(gao)(gao)(gao)度(du)(du)(du)(du)(du)看(kan)：YJV為(wei)250度(du)(du)(du)(du)(du)，VV為(wei)160、140。從技術經濟指(zhi)標看(kan)，三芯的(de)YJV比(bi)VV電纜(lan)(lan)的(de)各項參數都(dou)要(yao)高(gao)(gao)(gao)。