絕緣油(you)耐壓(ya)測定(ding)儀在變壓(ya)器油(you)擊穿電(dian)壓(ya)試驗中油(you)樣需要如何(he)準備？

擊穿(chuan)(chuan)是指(zhi)在(zai)電(dian)(dian)(dian)(dian)場作(zuo)用下，絕(jue)緣(yuan)材料形成(cheng)貫穿(chuan)(chuan)性(xing)橋路，進而(er)發生(sheng)破壞性(xing)放(fang)電(dian)(dian)(dian)(dian),在(zai)一定程度(du)上(shang)使電(dian)(dian)(dian)(dian)極間的(de)(de)電(dian)(dian)(dian)(dian)壓(ya)(ya)降(jiang)至(zhi)零(ling)或接(jie)近零(ling)的(de)(de)現象。通(tong)(tong)常情(qing)況(kuang)下,擊穿(chuan)(chuan)對(dui)固體(ti)介質(zhi)來說是永遠失去介電(dian)(dian)(dian)(dian)強(qiang)度(du),對(dui)液體(ti)、氣體(ti)來說，失去介電(dian)(dian)(dian)(dian)強(qiang)度(du)只是暫時(shi)性(xing)的(de)(de)。在(zai)規(gui)定的(de)(de)試(shi)(shi)驗(yan)條件下絕(jue)緣(yuan)體(ti)或試(shi)(shi)樣發生(sheng)擊穿(chuan)(chuan)時(shi)的(de)(de)電(dian)(dian)(dian)(dian)壓(ya)(ya)叫做擊穿(chuan)(chuan)電(dian)(dian)(dian)(dian)壓(ya)(ya)。通(tong)(tong)常情(qing)況(kuang)下,絕(jue)緣(yuan)性(xing)能(neng)的(de)(de)好壞直接(jie)反應(ying)了變壓(ya)(ya)器油(you)的(de)(de)擊穿(chuan)(chuan)電(dian)(dian)(dian)(dian)壓(ya)(ya)的(de)(de)強(qiang)弱,并且(qie)變壓(ya)(ya)器使用的(de)(de)安全(quan)性(xing)和周期受(shou)到(dao)直接(jie)的(de)(de)影(ying)響和制約。同時(shi)擊穿(chuan)(chuan)電(dian)(dian)(dian)(dian)壓(ya)(ya)也是客戶驗(yan)收(shou)油(you)品的(de)(de)重要(yao)測試(shi)(shi)項目，試(shi)(shi)驗(yan)結(jie)果(guo)受(shou)到(dao)試(shi)(shi)驗(yan)方法、測試(shi)(shi)儀器，以及環境等因(yin)素的(de)(de)影(ying)響和制約。

油樣的準備

1.樣(yang)品容器應清潔干(gan)燥，最(zui)好使(shi)用棕色玻璃瓶，也可以用不與絕(jue)緣油(you)作用的塑(su)料容器,但(dan)不能重(zhong)復使(shi)用。

2.應嚴格按照(zhao)GB/T4756--1984《石(shi)油(you)和液體石(shi)油(you)產品取(qu)樣法(fa)(手工(gong)法(fa))>要求取(qu)樣。

3.擊穿(chuan)電壓的(de)測(ce)試對試樣(yang)(yang)中微量的(de)水(shui)或其它雜質相當敏感，需用專用取(qu)樣(yang)(yang)器取(qu)樣(yang)(yang),以防止試樣(yang)(yang)污(wu)染。取(qu)樣(yang)(yang)前，取(qu)樣(yang)(yang)瓶的(de)溫(wen)度應不低于周圍(wei)空(kong)氣溫(wen)度。

4.對于桶裝(zhuang)或聽裝(zhuang)的(de)試樣(yang)(yang)(yang)應取(qu)(qu)絕緣油(you)最易帶來雜質的(de)地方,一般為容器底部(bu)。對于變(bian)壓器等(deng)(deng)油(you)的(de)取(qu)(qu)樣(yang)(yang)(yang),將沉積在(zai)(zai)下邊(bian)的(de)水分(fen)、雜質等(deng)(deng)在(zai)(zai)取(qu)(qu)樣(yang)(yang)(yang)前打開取(qu)(qu)樣(yang)(yang)(yang)油(you)門并放出，將油(you)門用(yong)干凈的(de)布擦干凈,然后(hou)(hou)再放-些油(you)對油(you)門和樣(yang)(yang)(yang)瓶進行(xing)沖(chong)洗(xi),沖(chong)洗(xi)2次后(hou)(hou)才能進行(xing)正式(shi)的(de)取(qu)(qu)樣(yang)(yang)(yang),樣(yang)(yang)(yang)品取(qu)(qu)完后(hou)(hou)及時塞緊(jin)瓶口。