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style="font-size:10.5pt">（1）核算試驗設(shè)備和電源容量是否滿足試驗要求。我國試驗變壓器的電壓等級有：5、10、25、35、50、100、150、300kV等；容量等級有：3、5、10、25、50、100、150、200kVA等。當(dāng)設(shè)備較多，而試驗變壓器容量較小時，可分批進(jìn)行試驗。例如對母線可進(jìn)行分段、分相進(jìn)行試驗。</span></p><p><span style="font-size:10.5pt">（2）拆除與耐壓設(shè)備相關(guān)聯(lián)的電子線路部件及其它不能承受此試驗電壓的設(shè)備部件，將被試設(shè)備的外殼和非被試設(shè)備可靠接地。</span></p><p><span style="font-size:10.5pt">（3）試驗變壓器使用前應(yīng)擦拭干凈，檢查變壓器內(nèi)的油是否足夠，不夠應(yīng)補(bǔ)充合格的變壓器油，在注油后應(yīng)靜止足夠的時間，以排除變壓器內(nèi)空氣，并用2500V兆歐表檢查各繞組對外殼及地的絕緣電阻。</span></p><p><span style="font-size:10.5pt">（4）在進(jìn)行交流耐壓試驗前，必須先進(jìn)行各項非破壞性試驗，如測量絕緣電阻、吸收比、介質(zhì)損失角tgδ、直流泄漏電流等，對各項試驗結(jié)果進(jìn)行綜合分析，如發(fā)現(xiàn)受潮或有絕緣缺陷時，應(yīng)設(shè)法消除后再進(jìn)行耐壓試驗，以免在交流耐壓試驗過程中，發(fā)生絕緣擊穿，擴(kuò)大絕緣缺陷，延長檢修時間，增加檢修工作量。</span></p><p><span style="font-size:10.5pt">（5）試驗儀器聯(lián)線正確，高壓輸出部分與被試品的連接應(yīng)可靠。</span></p><p><span style="font-size:10.5pt">2</span><span style="font-size:10.5pt">、無局放高壓試驗變壓器在交流耐壓試驗過程中應(yīng)注意事項</span></p><p><span style="font-size:10.5pt">（1）由于交流耐壓試驗是一種破壞性試驗，試驗所采用的試驗電壓往往比運行電壓高得多，過高的電壓會使絕緣介質(zhì)損失增大、發(fā)熱、放電，會加速絕緣缺陷的發(fā)展，故在對設(shè)備進(jìn)行交流耐壓試驗時應(yīng)根據(jù)絕緣介質(zhì)的不同及設(shè)備的運行狀況的不同，按照有關(guān)規(guī)程及試驗標(biāo)準(zhǔn)選取相應(yīng)的試驗電壓。</span></p><p><span style="font-size:10.5pt">（2）耐壓試驗過程中，升壓應(yīng)當(dāng)從零開始，禁止在30%試驗電壓以上沖擊合閘。當(dāng)試驗電壓升到40%以上時，應(yīng)均勻升壓，升壓速度為每秒3%試驗電壓左右。升壓過程中應(yīng)監(jiān)視電流的變化，當(dāng)保護(hù)動作后，應(yīng)查明原因，消除后再進(jìn)行試驗。</span></p><p><span style="font-size:10.5pt">（3）交流耐壓試驗中，加至試驗標(biāo)準(zhǔn)電壓后，為了便于觀察被試品的情況，同時也為了使已經(jīng)開始擊穿的缺陷來得及暴露出來，要求持續(xù)1min的耐壓時間。耐壓時間不應(yīng)過長，以免引起不應(yīng)有的絕緣損傷，甚至使本來合格的絕緣發(fā)生熱擊穿。耐壓時間一到，應(yīng)速將電壓降至輸出電壓的25%以下，再切斷電源，嚴(yán)禁在試驗電壓下切斷電源，否則可能產(chǎn)生使試品放電或擊穿的操作過電壓。</span></p><p><span style="font-size:10.5pt">（4）在工頻無局放試驗變壓器試驗過程中，若由于空氣的濕度、設(shè)備表面臟污等影響，引起試品表面閃絡(luò)放電或空氣擊穿，應(yīng)不能認(rèn)為不合格，應(yīng)處理后再試驗。</span></p><p><span style="font-size:10.5pt">3 </span><span style="font-size:10.5pt">、無局放高壓試驗變壓器在交流耐壓結(jié)束后應(yīng)注意事項</span></p><p><span style="font-size:10.5pt">（1）試品為有機(jī)絕緣材料時，試驗結(jié)束，切斷電源并使試品接地后，用手觸摸，如出現(xiàn)普遍或局部發(fā)熱，則認(rèn)為絕緣不良，需作處理；對夾層絕緣或有機(jī)絕緣材料的設(shè)備，在耐壓后應(yīng)測量絕緣電阻，如耐壓后絕緣電阻比耐壓前下降30%，應(yīng)查明原因。</span></p><p><span style="font-size:10.5pt">（2）對在耐壓試驗中擊穿的絕緣物，應(yīng)在試驗結(jié)束后破壞掉或作好明顯的長久性記號。</span></p><p><span style="font-size:10.5pt"><img alt="" src="http://img70.chem17.com/9/20191104/637084547312833658658.jpg" style="height:697px; margin:0px; width:750px" /></span></p> <div class="eqckvv83f" id="news_sx"><li id="eqckvv83f" class="sx_left">上一篇：<a href="/Article-331112.html">干式試驗高壓變壓器的維修和維護(hù)工作以及選購標(biāo)準(zhǔn)</a> <br />下一篇：<a href="/Article-329850.html">開關(guān)回路電阻測試儀的特點與使用說明</a></li></div> </div> </div> </div> </div> <script type="text/javascript"> $(document).ready(function(e) { $(".about_con img").each(function(index, element) { $(this).attr('style', 'max-width:100%'); }); }); </script> <div id="eqckvv83f" class="clear"></div>  <div id="eqckvv83f" class="ly_foot"> <div id="eqckvv83f" 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