直流高壓發生器測試哪些項目

直(zhi)(zhi)流高壓發生器(qi)主要(yao)適用于電(dian)力、礦山、冶金、鋼鐵等企業對氧化鋅(xin)避(bi)雷器(qi)、電(dian)力電(dian)纜(lan)、變壓器(qi)、發電(dian)機等高壓電(dian)氣(qi)設(she)備進行(xing)直(zhi)(zhi)流耐壓試(shi)驗。其(qi)中絕(jue)緣(yuan)(yuan)電(dian)阻測試(shi)、絕(jue)緣(yuan)(yuan)產品(pin)直(zhi)(zhi)流耐壓測試(shi)、電(dian)纜(lan)測試(shi)是最常用的三(san)種功率測試(shi)。

1、絕緣電阻測試

絕緣(yuan)電(dian)阻(zu)是電(dian)氣設(she)備和電(dian)路最基本的絕緣(yuan)指(zhi)標。對電(dian)介質施加直流(liu)(liu)電(dian)壓，經(jing)過一定時間的極(ji)化過程結束后，流(liu)(liu)過電(dian)介質的漏電(dian)流(liu)(liu)所(suo)對應的電(dian)阻(zu)稱為絕緣(yuan)電(dian)阻(zu)。

使用直流(liu)(liu)(liu)高壓(ya)發生器(qi)對被測材料加壓(ya)時(shi)(shi)，被測材料上(shang)的(de)(de)(de)電(dian)(dian)(dian)(dian)流(liu)(liu)(liu)不會(hui)瞬間達到(dao)穩(wen)定(ding)值(zhi)，而是(shi)有一個衰減過(guo)(guo)程(cheng)。在(zai)(zai)加壓(ya)的(de)(de)(de)同時(shi)(shi)，流(liu)(liu)(liu)過(guo)(guo)較大的(de)(de)(de)充電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)流(liu)(liu)(liu)，然(ran)后是(shi)較長時(shi)(shi)間緩慢(man)下降的(de)(de)(de)吸收電(dian)(dian)(dian)(dian)流(liu)(liu)(liu)，最(zui)終達到(dao)比(bi)較穩(wen)定(ding)的(de)(de)(de)導(dao)電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)流(liu)(liu)(liu)。測得的(de)(de)(de)電(dian)(dian)(dian)(dian)阻值(zhi)越高，達到(dao)平衡所需(xu)的(de)(de)(de)時(shi)(shi)間就越長。因此，為了在(zai)(zai)測量(liang)過(guo)(guo)程(cheng)中(zhong)正確(que)讀取被測電(dian)(dian)(dian)(dian)阻值(zhi)，應在(zai)(zai)其穩(wen)定(ding)后讀取該(gai)值(zhi)。

2、直流耐壓及漏電測試

為了絕(jue)緣良好，在直流(liu)(liu)電(dian)(dian)(dian)壓(ya)(ya)的(de)(de)作用下漏電(dian)(dian)(dian)流(liu)(liu)很小。同時(shi)，在相(xiang)同的(de)(de)直流(liu)(liu)電(dian)(dian)(dian)壓(ya)(ya)下，通(tong)過絕(jue)緣的(de)(de)電(dian)(dian)(dian)流(liu)(liu)隨著加(jia)(jia)壓(ya)(ya)時(shi)間的(de)(de)延長而減小。在絕(jue)緣良好的(de)(de)情況下，隨著外加(jia)(jia)直流(liu)(liu)電(dian)(dian)(dian)壓(ya)(ya)的(de)(de)增加(jia)(jia)，由于離子運動速度加(jia)(jia)快(kuai)，漏電(dian)(dian)(dian)流(liu)(liu)增加(jia)(jia)。但在不太高的(de)(de)電(dian)(dian)(dian)壓(ya)(ya)范(fan)圍內，漏電(dian)(dian)(dian)流(liu)(liu)與外加(jia)(jia)電(dian)(dian)(dian)壓(ya)(ya)的(de)(de)增加(jia)(jia)呈(cheng)線性關系，上(shang)升很小。

3、橡塑電纜直流耐壓試驗

試(shi)驗(yan)后電(dian)壓(ya)(ya)(ya)(ya)(ya)為(wei)(wei)電(dian)纜額定電(dian)壓(ya)(ya)(ya)(ya)(ya)的(de)3倍。在規定的(de)試(shi)驗(yan)電(dian)壓(ya)(ya)(ya)(ya)(ya)下（試(shi)驗(yan)電(dian)壓(ya)(ya)(ya)(ya)(ya)按每級額定電(dian)壓(ya)(ya)(ya)(ya)(ya)0.5倍分段增加，每段停留(liu)1min，記錄漏(lou)電(dian)流(liu)(liu)；注：如果(guo)漏(lou)電(dian)流(liu)(liu)隨電(dian)壓(ya)(ya)(ya)(ya)(ya)不成比例增加，一(yi)(yi)定要及時分析(xi)，檢查(cha)，國電(dian)西高(gao)耐(nai)壓(ya)(ya)(ya)(ya)(ya)前，用高(gao)壓(ya)(ya)(ya)(ya)(ya)兆(zhao)歐表檢查(cha)直流(liu)(liu)高(gao)壓(ya)(ya)(ya)(ya)(ya)發電(dian)機的(de)耐(nai)壓(ya)(ya)(ya)(ya)(ya)，使用方法是常規接法，一(yi)(yi)相接一(yi)(yi)相耐(nai)壓(ya)(ya)(ya)(ya)(ya)，一(yi)(yi)相帶耐(nai)壓(ya)(ya)(ya)(ya)(ya)裝置(zhi)，另一(yi)(yi)相兩相接地，三相電(dian)阻為(wei)(wei)三倍。

發布時間:2021-12-6 訪問次數:1059