高低壓電線(xian)并聯使(shi)用時需要(yao)注意哪些事項
作者: 發布(bu)時間:2023-03-30
一些工礦及(ji)化工企業新(xin)擴建(jian)的(de)(de)(de)技(ji)改項(xiang)目,電(dian)(dian)(dian)(dian)力電(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)采用并聯(lian)方式供電(dian)(dian)(dian)(dian),在所難免,在電(dian)(dian)(dian)(dian)力電(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)的(de)(de)(de)并聯(lian)使用時(shi)(shi),必須(xu)使兩(liang)根電(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)的(de)(de)(de)載流量分(fen)配(pei)均勻,否(fou)則將導致電(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)出(chu)現(xian)熱擊(ji)穿故障。 首(shou)先并聯(lian)使用的(de)(de)(de)兩(liang)根電(dian)(dian)(dian)(dian)力電(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan),電(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)型號規格(ge)長度統一,這(zhe)(zhe)樣在電(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)通(tong)電(dian)(dian)(dian)(dian)運(yun)行時(shi)(shi),兩(liang)根電(dian)(dian)(dian)(dian)力電(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)各(ge)類參數基本接近,載流量分(fen)配(pei)基本均勻,不(bu)(bu)會(hui)出(chu)現(xian)單(dan)根電(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)負荷(he)過重,提前出(chu)現(xian)大(da)面積(ji)發(fa)熱燒毀現(xian)象。 其次,并聯(lian)運(yun)行的(de)(de)(de)電(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan),彼(bi)此之間的(de)(de)(de)距離要(yao)考慮適當放大(da),這(zhe)(zhe)樣當一根電(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)出(chu)現(xian)故障時(shi)(shi),也不(bu)(bu)會(hui)波及(ji)旁邊并聯(lian)使用的(de)(de)(de)電(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)同時(shi)(shi)燒毀,這(zhe)(zhe)在一定程度上(shang)降低了企業的(de)(de)(de)電(dian)(dian)(dian)(dian)力經濟損失。 第(di)三,是(shi)并聯(lian)運(yun)行的(de)(de)(de)電(dian)(dian)(dian)(dian)力電(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan),要(yao)對電(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)兩(liang)端線鼻子(zi)與(yu)開關(guan)觸(chu)點接觸(chu)連接狀態,進行經常(chang)檢查,確保電(dian)(dian)(dian)(dian)纜(lan)(lan)(lan)(lan)(lan)與(yu)開關(guan)...
常(chang)用(yong)高壓電(dian)纜都需要做哪(na)些檢(jian)測
作者: 發(fa)布時間:2023-03-30
1、電(dian)(dian)(dian)(dian)(dian)功能檢(jian)測主要有(you)導(dao)體(ti)直(zhi)流電(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)、絕(jue)緣(yuan)(yuan)(yuan)電(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)、制(zhi)品電(dian)(dian)(dian)(dian)(dian)壓(ya)實(shi)驗及絕(jue)緣(yuan)(yuan)(yuan)線芯間電(dian)(dian)(dian)(dian)(dian)壓(ya)實(shi)驗,每項都很重(zhong)要,導(dao)體(ti)電(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)直(zhi)接反映(ying)了電(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)的(de)(de)電(dian)(dian)(dian)(dian)(dian)傳輸(shu)功能,直(zhi)接影響電(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)在(zai)通電(dian)(dian)(dian)(dian)(dian)運行中(zhong)的(de)(de)溫度(du)、壽命(ming)、電(dian)(dian)(dian)(dian)(dian)壓(ya)降(jiang)、以及運行安(an)(an)全,它(ta)主要考察導(dao)體(ti)的(de)(de)材(cai)質(zhi)和截(jie)面(mian)積(ji),若導(dao)體(ti)的(de)(de)材(cai)質(zhi)不好或(huo)截(jie)面(mian)積(ji)嚴重(zhong)不足,就(jiu)會(hui)造成(cheng)導(dao)體(ti)直(zhi)流電(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)嚴重(zhong)超(chao)標,這種電(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)鋪設在(zai)線路(lu)(lu)中(zhong)就(jiu)會(hui)增加電(dian)(dian)(dian)(dian)(dian)流在(zai)線路(lu)(lu)上通過(guo)時的(de)(de)損耗,引起(qi)電(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)導(dao)體(ti)本身(shen)發熱,引起(qi)包覆導(dao)體(ti)的(de)(de)絕(jue)緣(yuan)(yuan)(yuan)老化(hua)開裂(lie),造成(cheng)供電(dian)(dian)(dian)(dian)(dian)線路(lu)(lu)漏電(dian)(dian)(dian)(dian)(dian)、短(duan)路(lu)(lu),甚(shen)至造成(cheng)火災,危(wei)及人身(shen)、財(cai)產的(de)(de)安(an)(an)全。規(gui)(gui)范(fan)對(dui)不同規(gui)(gui)格電(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)的(de)(de)導(dao)體(ti)直(zhi)流電(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)值均(jun)有(you)嚴格的(de)(de)規(gui)(gui)則,不得大于規(gui)(gui)范(fan)規(gui)(gui)則的(de)(de)值。絕(jue)緣(yuan)(yuan)(yuan)電(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)、制(zhi)品電(dian)(dian)(dian)(dian)(dian)壓(ya)實(shi)驗及絕(jue)緣(yuan)(yuan)(yuan)線芯間電(dian)(dian)(dian)(dian)(dian)壓(ya)實(shi)驗,均(jun)考察的(de)(de)是電(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)絕(jue)緣(yuan)(yuan)(yuan)層(ceng)(ceng)和護(hu)套層(ceng)(ceng)的(de)(de)電(dian)(dian)(dian)(dian)(dian)氣絕(jue)緣(yuan)(yuan)(yuan)...
電纜(lan)故障(zhang)檢測(ce)查找(zhao)方(fang)法
作者: 發布(bu)時間:2023-03-30
零(ling)(ling)電(dian)(dian)(dian)(dian)位(wei)法(fa) 零(ling)(ling)電(dian)(dian)(dian)(dian)位(wei)法(fa)也就是(shi)(shi)電(dian)(dian)(dian)(dian)位(wei)比較(jiao)(jiao)法(fa),它適應于(yu)長(chang)度較(jiao)(jiao)短的(de)電(dian)(dian)(dian)(dian)纜(lan)(lan)芯(xin)線對(dui)(dui)(dui)地(di)故(gu)障(zhang),應用此方法(fa)測(ce)量(liang)(liang)簡便,不需要精密(mi)儀器和復雜(za)計算。測(ce)量(liang)(liang)原理如下:將電(dian)(dian)(dian)(dian)纜(lan)(lan)故(gu)障(zhang)芯(xin)線與(yu)等長(chang)的(de)比較(jiao)(jiao)導線并聯,在b、c兩端(duan)加電(dian)(dian)(dian)(dian)壓(ya)VE時(shi),相當(dang)于(yu)在兩個并聯的(de)均勻電(dian)(dian)(dian)(dian)阻(zu)絲兩端(duan)接(jie)了(le)電(dian)(dian)(dian)(dian)源,此時(shi),一(yi)條電(dian)(dian)(dian)(dian)阻(zu)絲上的(de)任何一(yi)點(dian)(dian)(dian)(dian)和另(ling)一(yi)條電(dian)(dian)(dian)(dian)阻(zu)絲上的(de)對(dui)(dui)(dui)應點(dian)(dian)(dian)(dian)之間的(de)電(dian)(dian)(dian)(dian)位(wei)差必然為零(ling)(ling),反之,電(dian)(dian)(dian)(dian)位(wei)差為零(ling)(ling)的(de)兩點(dian)(dian)(dian)(dian)必然是(shi)(shi)對(dui)(dui)(dui)應點(dian)(dian)(dian)(dian)。因為微(wei)(wei)伏(fu)(fu)表(biao)(biao)的(de)負極接(jie)地(di),與(yu)電(dian)(dian)(dian)(dian)纜(lan)(lan)故(gu)障(zhang)點(dian)(dian)(dian)(dian)等電(dian)(dian)(dian)(dian)位(wei),所以,當(dang)微(wei)(wei)伏(fu)(fu)表(biao)(biao)的(de)正(zheng)極在比較(jiao)(jiao)導線上移動(dong)至指(zhi)示值(zhi)為零(ling)(ling)時(shi)的(de)點(dian)(dian)(dian)(dian)與(yu)電(dian)(dian)(dian)(dian)纜(lan)(lan)故(gu)障(zhang)點(dian)(dian)(dian)(dian)等電(dian)(dian)(dian)(dian)位(wei),即電(dian)(dian)(dian)(dian)纜(lan)(lan)故(gu)障(zhang)點(dian)(dian)(dian)(dian)的(de)對(dui)(dui)(dui)應點(dian)(dian)(dian)(dian)。S為單相閘刀(dao)開關(guan),E為6E蓄電(dian)(dian)(dian)(dian)池或4節1號干電(dian)(dian)(dian)(dian)池,G為直流微(wei)(wei)伏(fu)(fu)表(biao)(biao),測(ce)量(liang)(liang)步驟如下: 1)先在b和c相芯(xin)線上接(jie)上電(dian)(dian)(dian)(dian)池E,...