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id="app_52253022" role="draggable" data-type="app" data-appid="datumInfo" data-config="" data-state="true"> <div id="pr3mjyzo" class="appMask"></div> <div id="pr3mjyzo" class="appContent"> <div id="pr3mjyzo" class="datum_info"> <h1 class="title">直流高壓發(fā)生器做耐壓試驗時會出現(xiàn)什么問題</h1> <div id="pr3mjyzo" class="bgcolor_01"> <div id="pr3mjyzo" class="bgcolor_sum"> <div id="pr3mjyzo" class="left">日期：2024-11-19 00:20</div> <div id="pr3mjyzo" class="right">瀏覽次數(shù)：231</div> </div> <div id="pr3mjyzo" class="bgcolor_sum01"> 摘要： </div> </div> <div id="pr3mjyzo" class="content"> 　直流高壓發(fā)生器的一般原理：施加到試件上的測試電壓場強須模擬高壓電器的工作條件。直流高壓發(fā)生器具有高精度和準(zhǔn)確的測量。電壓表和電流表均為數(shù)字顯示，電壓分辨率為0.1kV，電流分辨率為0.1uA。控制箱上的電壓表直接顯示添加到負(fù)載測試樣本中的電壓值。它不需要外部分壓器即可輕松接線。該儀器具有高低壓端以測量泄漏電流，高壓端由圓形屏蔽數(shù)字儀表顯示。它不怕放電沖擊，具有良好的抗干擾性能，適合現(xiàn)場使用。高壓測試通過或失敗的結(jié)論是要表示高壓電器中的弱點是否對將來的操作有害。這意味著測試中的故障機制應(yīng)與設(shè)備運行中的機制具有相同的物理過程。 <br>根據(jù)這一原理，直流高壓發(fā)生器直流電纜的耐壓測試主要表現(xiàn)在以下幾個方面：<br> 1.在直流電壓下，電纜絕緣層的電場分布取決于材料的體積。電阻率以及交流電壓下的電場分布取決于每種介質(zhì)的介電常數(shù)，尤其取決于電纜端子，接線盒等中的直流電場強度。分布和交變電場的分布強度完全不同，直流電壓下的絕緣老化機理與交流電壓下的老化機理不同。因此，直流耐壓測試不能模擬電纜<span style="font-size: 13.3333px;">。</span><br> 2，電纜會在直流電壓下產(chǎn)生; 記憶; 效果是，存儲會累積單極性殘留電荷。一旦由直流耐壓測試引起; 記憶; 釋放該直流偏置需要很長時間。如果在完全釋放直流殘留電荷之前投入使用，則直流偏置將疊加在工頻電壓的峰值上，從而使電纜上的電壓遠(yuǎn)遠(yuǎn)超過其額定電壓，這可能會導(dǎo)致電纜損壞。絕緣擊穿<span style="font-size: 13.3333px;">。</span> <br> 3.在直流耐壓測試中，電子被注入到聚合物介質(zhì)中以形成空間電荷，這會降低該位置的電場強度，使其難以擊穿。半導(dǎo)體半導(dǎo)體和污染點易于產(chǎn)生空間電荷。但是，如果在測試過程中電纜端子頭的表面閃爍或電纜附件損壞，則電纜芯上會發(fā)生波動。在空間電荷積累的地方，振蕩電壓的極性迅速變?yōu)橄喾吹臉O性。此時，電場強度會顯著增加，這可能會損壞絕緣并引起多次咔嗒聲。 <br> 4.電纜致命性的弱點之一是很容易在絕緣層中產(chǎn)生水分支。一旦產(chǎn)生了水分支，它將在直流電壓下迅速轉(zhuǎn)換為電分支，并形成放電，這將加速絕緣退化，從而使其在運行后在工頻電壓下運行。形成故障。和純凈的水分支正在交流它可以在工作電壓下維持相當(dāng)?shù)哪蛪?，并且可以維持一段時間。 <br> 5.實踐也表明，直流高壓發(fā)生器的直流耐壓測試不能有效地發(fā)現(xiàn)交流電壓作用下的某些缺陷，例如電纜附件中是否存在機械損傷或應(yīng)力錐錯位。 AC電壓下的絕緣*可能發(fā)生擊穿的位置，并且在DC電壓下通常不可能擊穿。直流電壓下的絕緣擊穿經(jīng)常發(fā)生，其中絕緣在交流工作條件下不會擊穿。 </div> <div id="pr3mjyzo" class="datumrelate"> 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