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直流高壓發生器測試中微安表的選擇與使用
直(zhi)流(liu)(liu)高(gao)(gao)壓發生器(qi)用于檢測(ce)(ce)(ce)(ce)直(zhi)流(liu)(liu)精(jing)密電(dian)(dian)(dian)源和換流(liu)(liu)站(zhan)設(she)備及絕緣(yuan)材料在(zai)直(zhi)流(liu)(liu)高(gao)(gao)壓下的(de)(de)(de)(de)絕緣(yuan)強度(du)、直(zhi)流(liu)(liu)幸福線的(de)(de)(de)(de)電(dian)(dian)(dian)暈和離子電(dian)(dian)(dian)流(liu)(liu)及其(qi)影響，以及交直(zhi)流(liu)(liu)電(dian)(dian)(dian)源的(de)(de)(de)(de)漏電(dian)(dian)(dian)流(liu)(liu)測(ce)(ce)(ce)(ce)試設(she)備。此(ci)外，還可(ke)作(zuo)為(wei)其(qi)他高(gao)(gao)壓測(ce)(ce)(ce)(ce)試設(she)備的(de)(de)(de)(de)電(dian)(dian)(dian)源，如沖(chong)擊(ji)電(dian)(dian)(dian)壓發生器(qi)、沖(chong)擊(ji)電(dian)(dian)(dian)流(liu)(liu)發生器(qi)、振(zhen)蕩電(dian)(dian)(dian)路等(deng)。微(wei)電(dian)(dian)(dian)流(liu)(liu)表是直(zhi)流(liu)(liu)高(gao)(gao)壓發生器(qi)的(de)(de)(de)(de)重要組成(cheng)部分，用于檢測(ce)(ce)(ce)(ce)電(dian)(dian)(dian)壓測(ce)(ce)(ce)(ce)試中的(de)(de)(de)(de)漏電(dian)(dian)(dian)流(liu)(liu)。
使(shi)用(yong)直(zhi)(zhi)流(liu)(liu)(liu)高(gao)壓發生器微(wei)電(dian)流(liu)(liu)(liu)表(biao)(biao)(biao)時應注意(yi)以下注意(yi)事項(xiang)。直(zhi)(zhi)流(liu)(liu)(liu)高(gao)壓發生器微(wei)電(dian)流(liu)(liu)(liu)表(biao)(biao)(biao)在測(ce)試過程(cheng)中接(jie)線(xian)不可(ke)靠或不講究，容易導(dao)致升壓過程(cheng)中周圍物體放電(dian)。此外，不當(dang)的放電(dian)時間和順序可(ke)能(neng)會直(zhi)(zhi)接(jie)導(dao)致微(wei)電(dian)流(liu)(liu)(liu)表(biao)(biao)(biao)的損壞。
使用直流(liu)高(gao)壓(ya)(ya)發生器前，需要(yao)仔細檢查高(gao)壓(ya)(ya)輸出線與其他(ta)物(wu)(wu)體之間(jian)是(shi)否(fou)有足夠的(de)(de)安全距離，被測(ce)(ce)(ce)物(wu)(wu)體高(gao)壓(ya)(ya)側是(shi)否(fou)有足夠的(de)(de)安全距離。測(ce)(ce)(ce)試結束后，測(ce)(ce)(ce)試人員必須將直流(liu)高(gao)壓(ya)(ya)發生器的(de)(de)電(dian)(dian)壓(ya)(ya)降至零位并打開明顯(xian)的(de)(de)電(dian)(dian)源切斷點，然后才(cai)能使用放(fang)電(dian)(dian)棒對測(ce)(ce)(ce)試對象(xiang)進行放(fang)電(dian)(dian)。整個放(fang)電(dian)(dian)過(guo)程分為(wei)兩部分。
放電(dian)(dian)(dian)(dian)(dian)時，放電(dian)(dian)(dian)(dian)(dian)棒(bang)(bang)不應立即(ji)接觸(chu)被測物。放電(dian)(dian)(dian)(dian)(dian)棒(bang)(bang)的(de)(de)頭部應逐漸(jian)靠近被測物。無聲時，放電(dian)(dian)(dian)(dian)(dian)棒(bang)(bang)可直(zhi)接接地線放電(dian)(dian)(dian)(dian)(dian)。直(zhi)流高壓發生(sheng)器微電(dian)(dian)(dian)(dian)(dian)流表(biao)的(de)(de)使用壽命直(zhi)接關系(xi)到測試儀的(de)(de)操(cao)作方法。接線質(zhi)量(liang)和放電(dian)(dian)(dian)(dian)(dian)時間直(zhi)接關系(xi)到微電(dian)(dian)(dian)(dian)(dian)流表(biao)的(de)(de)壽命。
直(zhi)流高壓(ya)發(fa)生器(qi)微電(dian)流表(biao)規格(ge)及配置：
常(chang)(chang)規測(ce)試(shi)(shi)中，避雷器的(de)(de)直(zhi)(zhi)流(liu)漏電(dian)(dian)測(ce)試(shi)(shi)為(wei)1mA電(dian)(dian)流(liu)和75%參考電(dian)(dian)壓下的(de)(de)直(zhi)(zhi)流(liu)漏電(dian)(dian)測(ce)試(shi)(shi)，最大電(dian)(dian)流(liu)值為(wei)1000ua。在常(chang)(chang)規測(ce)試(shi)(shi)中，電(dian)(dian)纜的(de)(de)直(zhi)(zhi)流(liu)泄(xie)漏測(ce)試(shi)(shi)電(dian)(dian)流(liu)值較小。直(zhi)(zhi)流(liu)高(gao)壓發生器的(de)(de)微安表通常(chang)(chang)采用三(san)位(wei)半液晶(jing)顯示（范(fan)圍：0-1999ua），對于(yu)常(chang)(chang)規直(zhi)(zhi)流(liu)漏電(dian)(dian)測(ce)試(shi)(shi)項目來(lai)說，這(zhe)個范(fan)圍足夠了。
只有經常使用大容量電(dian)(dian)纜(lan)(lan)時，才需要(yao)更大范(fan)(fan)圍的微(wei)安表。由于電(dian)(dian)纜(lan)(lan)加壓時充(chong)電(dian)(dian)電(dian)(dian)流比較大，建議選擇4.5位液晶(jing)微(wei)安表（范(fan)(fan)圍：0-19999ua或0-1999.9ua）。
