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您現在位置(zhi):堅寶電線電纜(lan)直流耐壓試驗應注意的問題
發布時間:2024.01.10 新聞來源:廣東堅寶電纜有限公司 瀏覽次數:

 

1. 實(shi)驗前先(xian)對(dui)(dui)電(dian)(dian)(dian)纜(lan)驗電(dian)(dian)(dian),并(bing)對(dui)(dui)地充沛(pei)放電(dian)(dian)(dian);將電(dian)(dian)(dian)纜(lan)兩頭(tou)所(suo)(suo)銜接設(she)備斷(duan)開,實(shi)驗時(shi)不順(shun)便其他設(she)備;將兩頭(tou)電(dian)(dian)(dian)纜(lan)頭(tou)絕緣外表(biao)擦(ca)潔凈,以削減外表(biao)走漏電(dian)(dian)(dian)流所(suo)(suo)引起的差錯,必(bi)要時(shi)應在電(dian)(dian)(dian)纜(lan)頭(tou)相間加絕緣擋板。

2. 實(shi)驗(yan)場所應做好安(an)全措施如安(an)圍(wei)欄等,特別是(shi)(shi)在電纜另一(yi)端要掛好警告牌并派專人看守以(yi)防(fang)外人接近(jin),查看接地線、放電棒是(shi)(shi)否接好。

3. 加壓(ya)時,應(ying)分(fen)段逐步緩慢升(sheng)電(dian)(dian)壓(ya)以防充電(dian)(dian)電(dian)(dian)流(liu)過(guo)大(da),并分(fen)別在0.25、0.5、0.75、1.0倍實驗(yan)電(dian)(dian)壓(ya)下逗(dou)留1分(fen)鐘后(hou)讀(du)取走漏(lou)電(dian)(dian)流(liu)值;最(zui)終在實驗(yan)電(dian)(dian)壓(ya)下按(an)規則(ze)的時刻(ke)進行耐(nai)壓(ya)實驗(yan),并在耐(nai)壓(ya)實驗(yan)終了(le)前,再(zai)讀(du)取耐(nai)壓(ya)后(hou)的走漏(lou)電(dian)(dian)流(liu)值。

4. 依據電(dian)纜類型不同,微(wei)安表(biao)(biao)有不同的(de)接(jie)線辦(ban)法,一般都(dou)采納微(wei)安表(biao)(biao)接(jie)在(zai)高(gao)壓(ya)側,高(gao)壓(ya)引(yin)線及微(wei)安表(biao)(biao)加屏(ping)蔽。關(guan)于(yu)帶有銅絲網(wang)屏(ping)蔽層且對地絕緣的(de)電(dian)力電(dian)纜,也可將微(wei)安表(biao)(biao)串接(jie)在(zai)被試電(dian)纜的(de)地線回路,在(zai)微(wei)安表(biao)(biao)兩(liang)頭(tou)并聯(lian)一放(fang)(fang)電(dian)開(kai)(kai)關(guan),丈(zhang)量時將開(kai)(kai)關(guan)擺開(kai)(kai),丈(zhang)量后放(fang)(fang)電(dian)前將開(kai)(kai)關(guan)合上,防止放(fang)(fang)電(dian)電(dian)流沖擊損壞微(wei)安表(biao)(biao)。

5. 應在(zai)(zai)高(gao)(gao)壓(ya)(ya)(ya)側(ce)直(zhi)(zhi)接丈(zhang)(zhang)量實(shi)(shi)驗(yan)(yan)電(dian)壓(ya)(ya)(ya)。因為選用半(ban)波(bo)整流或(huo)倍(bei)壓(ya)(ya)(ya)整流時,如采納在(zai)(zai)低壓(ya)(ya)(ya)側(ce)丈(zhang)(zhang)量電(dian)壓(ya)(ya)(ya)換算(suan)至高(gao)(gao)壓(ya)(ya)(ya)側(ce)電(dian)壓(ya)(ya)(ya)的辦(ban)法,因為電(dian)壓(ya)(ya)(ya)波(bo)形和變比差錯(cuo)(cuo)以(yi)及(ji)雜散電(dian)流的影響,或(huo)許會(hui)使高(gao)(gao)壓(ya)(ya)(ya)實(shi)(shi)驗(yan)(yan)電(dian)壓(ya)(ya)(ya)幅(fu)值發生較大(da)的差錯(cuo)(cuo),故應在(zai)(zai)高(gao)(gao)壓(ya)(ya)(ya)側(ce)直(zhi)(zhi)接丈(zhang)(zhang)量實(shi)(shi)驗(yan)(yan)電(dian)壓(ya)(ya)(ya)。

6. 每次耐壓實驗結(jie)束,應(ying)先降壓,堵截電(dian)(dian)源。然后對(dui)被試電(dian)(dian)纜用每千伏約(yue)80千歐的限流電(dian)(dian)阻對(dui)地(di)放(fang)(fang)電(dian)(dian)數次,然后再直接對(dui)地(di)放(fang)(fang)電(dian)(dian),放(fang)(fang)電(dian)(dian)時刻應(ying)不少于(yu)5分鐘以(yi)確保充沛放(fang)(fang)電(dian)(dian)。

 

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