直(zhi)流(liu)耐(nai)壓和交流(liu)耐(nai)壓的區別是(shi)什(shen)么?
1直流(liu)耐壓(ya)(ya)在電(dian)壓(ya)(ya)為正負峰值時,設備均(jun)承受最(zui)高的(de)(de)電(dian)壓(ya)(ya)值;選用(yong)直流(liu)耐壓(ya)(ya)需要施加的(de)(de)電(dian)壓(ya)(ya)為交流(liu)電(dian)壓(ya)(ya)的(de)(de)1.414倍。
2直(zhi)流耐(nai)壓(ya)為實際加(jia)(jia)在(zai)設備上的電壓(ya)值,逐漸加(jia)(jia)壓(ya),存在(zai)絕緣(yuan)問題可以再加(jia)(jia)壓(ya)過程(cheng)中發現,測試完成后需要放電。直(zhi)流耐(nai)壓(ya)只能在(zai)一個方向上考察(cha)設備的絕緣(yuan)強度。
3交流電壓能夠(gou)考(kao)察設備(bei)的(de)兩(liang)個極性,更接(jie)近于實際情況,無(wu)需逐漸升壓。
4直流(liu)耐壓(ya)(ya)試(shi)驗(yan)雖然試(shi)驗(yan)電(dian)(dian)壓(ya)(ya)比較(jiao)高,能發現(xian)一些絕緣(yuan)的(de)(de)(de)(de)弱點,但是(shi)(shi)由于電(dian)(dian)力設備(bei)的(de)(de)(de)(de)絕緣(yuan)大(da)多數(shu)都是(shi)(shi)組合電(dian)(dian)介質,在(zai)直流(liu)電(dian)(dian)壓(ya)(ya)的(de)(de)(de)(de)作(zuo)(zuo)用下,其電(dian)(dian)壓(ya)(ya)是(shi)(shi)按(an)電(dian)(dian)阻分布的(de)(de)(de)(de),所(suo)以交流(liu)電(dian)(dian)力設備(bei)在(zai)交流(liu)電(dian)(dian)場下的(de)(de)(de)(de)弱點使用直流(liu)作(zuo)(zuo)試(shi)驗(yan)就不一定能夠(gou)發現(xian)。交流(liu)耐壓(ya)(ya)試(shi)驗(yan)符合電(dian)(dian)力設備(bei)在(zai)運行(xing)中(zhong)所(suo)承(cheng)受的(de)(de)(de)(de)電(dian)(dian)氣狀況,同時交流(liu)耐壓(ya)(ya)試(shi)驗(yan)一般比運行(xing)電(dian)(dian)壓(ya)(ya)高,因此通過試(shi)驗(yan)后,設備(bei)有較(jiao)大(da)的(de)(de)(de)(de)安全(quan)裕度。
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