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title="自動(dòng)元件分析儀">自動(dòng)元件分析儀</a></li> <li id="5hlvxzllpl3" class="left_nav_xl"><a href="/SonList-1627334.html" title="電容測(cè)量?jī)x">電容測(cè)量?jī)x</a></li> <li id="5hlvxzllpl3" class="left_nav_xl"><a href="/SonList-1384347.html" title="LCR數(shù)字電橋系列">LCR數(shù)字電橋系列</a></li> </div> </ul> <li><a href="/ParentList-1408385.html" title="同高電子" onmouseover="showsubmenu('同高電子')" class="on">同高電子</a></li> <ul> <div class="5hlvxzllpl3" id="submenu_同高電子" style="display:none"> <li id="5hlvxzllpl3" class="left_nav_xl"><a href="/SonList-1408386.html" title="壓敏電阻測(cè)試儀">壓敏電阻測(cè)試儀</a></li> </div> </ul> </ul> </div> <div id="5hlvxzllpl3" class="page-right"> <div id="5hlvxzllpl3" class="onurl"> <a href="/"><img src="/Skins/333987/images/home.png"></a><a href="/">網(wǎng)站首頁(yè)</a>><a href="/article.html">技術(shù)文章</a> > 三相變壓器局攻試驗(yàn)方法</div> <div id="5hlvxzllpl3" class="page-news"> <div id="5hlvxzllpl3" class="newshowheader"> <h1 class="nd_title">三相變壓器局攻試驗(yàn)方法</h1> <div id="5hlvxzllpl3" class="article-info"> <span> 瀏覽：</span> 1666<span id="5hlvxzllpl3" class="split">|</span> <span id="publishtime">更新時(shí)間：2022-04-26</span> <span id="5hlvxzllpl3" class="split">|</span> </div> </div> <div id="5hlvxzllpl3" class="page-newshow"> <p>一．開(kāi)展變壓器局部放電的重要性</p><p> </p><p>1</p><p>．</p><p>與變壓器局部放電有關(guān)系的參數(shù)主要有兩個(gè)，一個(gè)是施加在變壓器絕緣體上電場(chǎng)強(qiáng)度，</p><p>第二個(gè)是絕緣材料的介電強(qiáng)度。當(dāng)介電強(qiáng)度</p><p>></p><p>電場(chǎng)強(qiáng)度時(shí)，是不會(huì)發(fā)生放電的。但電力設(shè)備</p><p>在實(shí)際運(yùn)行中，</p><p>電場(chǎng)強(qiáng)度不是任何地方都均勻相等的，</p><p>絕緣體的介電強(qiáng)度也不是均勻相等的，</p><p>當(dāng)某個(gè)地方剛好電場(chǎng)強(qiáng)度偏強(qiáng)，而介電強(qiáng)度偏弱，也即電場(chǎng)強(qiáng)度</p><p>></p><p>介電強(qiáng)度時(shí)它就很可能產(chǎn)</p><p>生局部放電，所以局部放電的原因基本上可歸結(jié)為兩大類：</p><p> </p><p>①電場(chǎng)不均勻</p><p> </p><p>②電介質(zhì)不均勻。</p><p> </p><p>2</p><p>．變壓器的絕緣內(nèi)部也會(huì)存在著氣隙（氣泡）</p><p>，</p><p> </p><p>這些氣隙通常是在制造過(guò)程中形成的，比如電木筒和電木板的各紙層之間，由于真空浸</p><p>漆干燥工藝不好，就會(huì)在內(nèi)部形成空腔，從而形成了氣隙</p><p> </p><p>3</p><p>．電介質(zhì)不均勻有：</p><p> </p><p>①絕緣體中含有氣泡或雜質(zhì)</p><p> </p><p>②不同固體組合的復(fù)合介質(zhì)</p><p> </p><p>③另外變壓器絕緣結(jié)構(gòu)中由于設(shè)計(jì)或制造上的原因內(nèi)部有些部位存在針尖狀的導(dǎo)體或?qū)?/p><p>體表面有毛刺則在針尖附近電場(chǎng)集中，</p><p>，會(huì)使某些區(qū)域的電場(chǎng)過(guò)于集中，在此電場(chǎng)集中的地</p><p>方，就可能使局部絕緣擊穿或沿固體絕緣表面放電。</p><p> </p><p>絕緣試驗(yàn)在高壓試驗(yàn)中占有非常重要的地位，它直接關(guān)系到電力設(shè)備的安全運(yùn)行。</p><p> </p><p>4 .</p><p>現(xiàn)有的絕緣試驗(yàn)有很多種，基本上可以歸為兩類，</p><p> </p><p>①一類是耐壓試驗(yàn)：</p><p>如交流耐壓、直流耐壓、</p><p>串聯(lián)諧振耐壓，</p><p>操作沖擊波和雷電沖擊波試</p><p>驗(yàn)等。</p><p>一般耐壓試驗(yàn)都屬于考核試驗(yàn)，</p><p>它只能判斷試品的好和壞，</p><p>如果試品被擊穿并且不是</p><p>接頭或引線等能修復(fù)的，</p><p>那么試品基本上也就報(bào)廢了，</p><p>即使試驗(yàn)通過(guò)如果設(shè)備有缺陷有可能</p><p>加劇設(shè)備的老化和損壞程度，因此屬于破壞性試驗(yàn)。</p><p> </p><p>②另一類是特性試驗(yàn)：如絕緣電阻測(cè)試、極化指數(shù)，吸收比測(cè)試、泄漏電流測(cè)試、介質(zhì)</p><p>損耗測(cè)試、</p><p>變比試驗(yàn)以及局部放電測(cè)試。</p><p>由于絕緣電阻、</p><p>介質(zhì)損耗和泄漏電流的測(cè)試電壓一</p><p>般偏低，比較難發(fā)現(xiàn)一些的存在的異常隱患。</p><p> </p><p>5</p><p>．局部放電試驗(yàn)是有著它*的優(yōu)點(diǎn)的</p><p>,</p><p>局部放電測(cè)試的基本上是絕緣損壞的前期過(guò)</p><p>程，</p><p>而且局部放電電壓比耐壓試驗(yàn)電壓低的多，</p><p>因此在試驗(yàn)過(guò)程損傷被試物的可能要小得多。</p><p>但比常規(guī)試驗(yàn)電壓要高的多，</p><p>并且時(shí)間可以長(zhǎng)達(dá)數(shù)小時(shí)，</p><p>因此它可以有效地發(fā)現(xiàn)常規(guī)試驗(yàn)發(fā)</p><p>現(xiàn)不了的初期剛開(kāi)始出現(xiàn)的一些缺陷，它可以提前告之檢修人員有關(guān)設(shè)備的缺陷與老化程</p><p>度，使檢修人員及早進(jìn)行維修或采取相應(yīng)措施，從而延長(zhǎng)設(shè)備的使用壽命，防止事故發(fā)生。</p><p> </p><p> </p><p>二．局放放電試驗(yàn)測(cè)試</p><p> </p><p>局部放電測(cè)試技術(shù)有脈沖電流法、超聲波法、超高頻法、光測(cè)法、紅外熱像、色譜分</p><p>析等等。</p><p>但目前世界上</p><p>90%</p><p>的局放儀都是采用脈沖電流法</p><p>（</p><p>ERA</p><p>）</p><p>，</p><p>因?yàn)樗悄壳办`敏度zui高、</p><p>zui成熟的測(cè)試手段，也是</p><p>IEC</p><p>和我國(guó)有關(guān)標(biāo)準(zhǔn)推薦的測(cè)試方法。</p><p> </p><p>局部放電時(shí)會(huì)產(chǎn)生電、光、熱、聲等現(xiàn)象，而這些現(xiàn)象都可以檢測(cè)到局部放電；</p><p> </p><p>1</p><p>．脈沖電流法：</p><p> </p><p>脈沖電流法的基本原理：如果將試品接入高壓回路，當(dāng)試品加上高壓如果發(fā)生局部放電，</p><p>試品</p><p>C</p><p>x</p><p>兩端將產(chǎn)生一個(gè)幾乎瞬間的電壓</p><p>U</p><p>1</p><p>變化，</p><p>試品兩端的電壓變化在檢測(cè)回路中形成一</p><p>脈沖電流</p><p>I</p><p>，此時(shí)利用耦合電容和檢測(cè)阻抗可以與試品構(gòu)成回路，回路中就有一個(gè)脈動(dòng)電流</p><p>流過(guò)檢測(cè)阻抗，脈沖電流</p><p>I</p><p>流經(jīng)檢測(cè)阻抗產(chǎn)生的脈沖電壓予以采集，放大和顯示等處理，就</p><p>可測(cè)定局部放電視在放電量</p><p>q</p><p>（皮庫(kù)</p><p>pc</p><p>表示）</p><p>。</p><p> </p><p>①脈沖電流法主要利用局部放電頻頻譜中的較低頻段部分，一般為數(shù)</p><p>kHz</p><p>至數(shù)百</p><p>kHz</p><p>，</p><p>以避免無(wú)線電干擾；</p><p>而局部放電測(cè)試儀一般均配有脈沖峰值表指示脈沖峰值，</p><p>并有示波管顯</p><p>示脈沖大小，個(gè)數(shù)與相位、一般局放儀放大器增益可以做得很大，</p><p>其測(cè)試靈敏度相當(dāng)高，可</p><p>用已知電荷量的脈沖注入到試品中進(jìn)行校正定量，從而可測(cè)出放電量</p><p>q</p><p>。</p><p> </p><p>②實(shí)際測(cè)試時(shí)，</p><p>我們采用的是對(duì)比法，</p><p>首先在試品上加一標(biāo)準(zhǔn)電荷來(lái)調(diào)節(jié)局放儀的靈敏度，</p><p>并建立標(biāo)尺，</p><p>然后將實(shí)際加壓時(shí)檢測(cè)到的試品放電脈沖與標(biāo)尺進(jìn)行對(duì)比，</p><p>從而得出視在放電</p><p>量。</p><p> </p><p>2</p><p>．</p><p>校準(zhǔn)的基本原理</p><p> </p><p>①直接校準(zhǔn)</p><p> </p><p>將已知電荷量</p><p>Q</p><p>0</p><p>注入試品兩端稱為直接校準(zhǔn)，其目的是直接求得指示系統(tǒng)和以視在放</p><p>電量</p><p>Q</p><p>表征的試品內(nèi)部放電量之間的定量關(guān)系，即求得換算系數(shù)</p><p>K</p><p>。</p><p>。</p><p> </p><p>接好整個(gè)試驗(yàn)回路，將已知電荷量</p><p>Q</p><p>0</p><p>=</p><p>U</p><p>0</p><p>C</p><p>0</p><p>注入被試變壓器高壓線圈對(duì)地兩端，則指示</p><p>系統(tǒng)響應(yīng)為</p><p>L</p><p>′。取下校準(zhǔn)方波發(fā)生器，加電壓試驗(yàn)，當(dāng)試品內(nèi)部放電時(shí)，指示系統(tǒng)響應(yīng)為</p><p>L</p><p>。由此則可得換算系數(shù)</p><p> </p><p>K</p><p>h</p><p>為</p><p> </p><p>K</p><p>h</p><p>=L/L</p><p>/</p><p></p><p> </p><p>則視在放電量</p><p>Q</p><p>為</p><p> </p><p> Q=U</p><p>0</p><p>C</p><p>0</p><p>K</p><p>h</p><p></p><p> </p><p> </p><p>式中</p><p> </p><p>Q</p><p>——視在放電量，</p><p>pC</p><p>；</p><p> </p><p>U</p><p>0</p><p>——方波電壓幅值，</p><p>V</p><p>；</p><p> </p><p> </p><p>C</p><p>0</p><p>——電容，</p><p>pF</p><p>；</p><p> </p><p>K</p><p>h</p><p>——換算系數(shù)。</p><p> </p><p>②校準(zhǔn)方波發(fā)生器每次使用前應(yīng)檢查校準(zhǔn)方波發(fā)生器電池是否充足電。</p><p> </p><p>③</p><p>從</p><p>C</p><p>0</p><p>到</p><p>C</p><p>X</p><p>的引線應(yīng)盡可能短直，</p><p>C</p><p>0</p><p>與校準(zhǔn)方波發(fā)生器之間的連線選用同軸電纜，以</p><p>免造成校準(zhǔn)方波的波形畸變。</p><p> </p><p>3.</p><p>當(dāng)更換被試變壓器相位時(shí)或變?cè)囼?yàn)回路任一參數(shù)時(shí)，必須重新校準(zhǔn)。</p><p> </p><p>4.</p><p>測(cè)定回路的背景噪聲水平。背景噪聲水平應(yīng)低于試品允許放電量的</p><p>50%</p><p>，現(xiàn)場(chǎng)試驗(yàn)時(shí)，</p><p>如以上條件達(dá)不到，可以允許有較大干擾，但不得影響測(cè)量讀數(shù)。</p><p> </p><p>5.</p><p>在整個(gè)試驗(yàn)時(shí)間內(nèi)應(yīng)連續(xù)觀察放電波形，并按一定的時(shí)間間隔記錄放電量</p><p>Q</p><p>。</p><p>，以相對(duì)穩(wěn)</p><p>定的zui高重復(fù)脈沖為準(zhǔn)，偶爾發(fā)生的較高的脈沖可忽略，但應(yīng)作好記錄備查。整個(gè)試驗(yàn)期</p><p>間試品不發(fā)生擊穿；在</p><p>U</p><p>2</p><p>的第二階段的</p><p>30</p><p>（</p><p>60</p><p>）</p><p>min</p><p>內(nèi)，所有測(cè)量端子測(cè)得的放電量</p><p>Q</p><p>，連</p><p>續(xù)地維持在允許的限值內(nèi)，并無(wú)明顯地、不斷地向允許的限值內(nèi)增長(zhǎng)的趨勢(shì)，則試品合格。</p><p> </p><p>如果放電量曾超出允許限值，但之后又下降并低于允許的限值，則試驗(yàn)應(yīng)繼續(xù)進(jìn)行，直到</p><p>此后</p><p>3min</p><p>的期間內(nèi)局部放電量不超過(guò)允許的限值，試品才合格。</p><p> </p><p> </p><p>四．表征變壓器局部放電參數(shù)</p><p> </p><p>局部放電</p><p>：在電場(chǎng)的作用下電氣設(shè)備中絕緣只有部分區(qū)域發(fā)生放電現(xiàn)象，而沒(méi)有貫穿施加</p><p>電壓的導(dǎo)體之間（尚末擊穿）</p><p>，這種現(xiàn)象稱為局部放電。</p><p> </p><p>主絕緣：</p><p>變壓器相間的絕緣、繞組之間的絕緣、以及繞組對(duì)地絕緣、高壓套管對(duì)外殼的絕</p><p>緣</p><p> </p><p>縱絕緣：</p><p>變壓器繞組匝間、層間、段間絕緣</p><p> </p><p>全絕緣</p><p>：高壓、中壓、低壓繞組間和對(duì)油箱、鐵心等接地部分的絕緣。</p><p> </p><p>分級(jí)絕緣：</p><p>降低了中點(diǎn)絕緣水平的變壓器叫做分級(jí)絕緣變壓器（即中性點(diǎn)絕緣水平與線端</p><p>不同）</p><p> </p><p>起始放電電壓</p><p>：</p><p>當(dāng)施加于試品上的試驗(yàn)電壓從還末在測(cè)量?jī)x器上觀察到局部放電</p><p>（放電量</p><p>剛剛超過(guò)局放規(guī)定值）</p><p>的較低電壓遂漸上升，</p><p>到剛好到能觀察到局部放電信號(hào)時(shí)的zui低電壓</p><p>稱為局部放電起始放電電壓。</p><p> </p><p>熄滅放電電壓</p><p>：</p><p>當(dāng)施加于試品上的試驗(yàn)電壓從開(kāi)始在測(cè)量?jī)x器上觀察到局部放電電壓</p><p>（起</p><p>始放電電壓）繼續(xù)上升到較高電壓后（一般高</p><p>10</p><p>℅）</p><p>，在將電壓緩慢均勻下降到局部放電測(cè)</p><p>量?jī)x器上觀察不到局部放電信號(hào)剛好消失時(shí)的試驗(yàn)電壓稱為局部放電熄滅電壓</p><p> </p><p>背景噪聲：</p><p>在局放試驗(yàn)中檢測(cè)到的不是由試品產(chǎn)生的信號(hào)干擾：</p><p>是除設(shè)備的局放信號(hào)以外</p><p>的一切信號(hào)。</p><p>當(dāng)噪聲信號(hào)達(dá)到對(duì)測(cè)試產(chǎn)生不良反應(yīng)的程度時(shí)就成為干擾。</p><p>測(cè)量回路的背景噪</p><p>聲水平應(yīng)低于允許放電水平的</p><p>50%</p><p>。</p><p>當(dāng)試品的允許放電水平為</p><p>10PC</p><p>或以下時(shí)</p><p>,</p><p>背景噪聲水平</p><p>可達(dá)到允許放電水平的</p><p>。</p><p> 電暈</p><p>：若導(dǎo)體附近的電場(chǎng)強(qiáng)度達(dá)到了周圍大氣的擊穿場(chǎng)強(qiáng)，于是就在導(dǎo)體附近出現(xiàn)電暈。</p><p>電氣設(shè)備主要的特征就是在絕緣體表面且周圍是氣體的，我們則稱之為電暈。</p><p> </p><p>電暈的放電脈沖就出現(xiàn)在外加電壓負(fù)半周的</p><p>90</p><p>0</p><p>相位附近，幾乎是對(duì)稱于</p><p>90</p><p>0</p><p>，出現(xiàn)的放電</p><p>脈沖幾乎是等幅值、等間隔的，隨著電壓的提高，放電大小幾乎不變，而次數(shù)增加，當(dāng)電壓</p><p>足夠高時(shí)，在正半周也會(huì)出現(xiàn)少量幅值較大的放電，正負(fù)半周波形是極不對(duì)稱的。</p><p> </p><p>局部放電：</p><p>在電場(chǎng)的作用下電氣設(shè)備中絕緣只有部分區(qū)域發(fā)生放電現(xiàn)象，</p><p>而沒(méi)有貫穿施加</p><p>電壓的導(dǎo)體之間（尚末擊穿）</p><p>，這種現(xiàn)象稱為局部放電。</p><p> </p><p>局部放電可以發(fā)生在絕緣結(jié)構(gòu)內(nèi)部氣隙、油膜、或?qū)w（電極）邊緣電場(chǎng)比較集中的部</p><p>位，但在電極之間末形成貫穿性放電通道。</p><p> </p><p>內(nèi)部放電：</p><p>一般來(lái)說(shuō)，如果局部放電是在絕緣體內(nèi)部發(fā)生的，則稱之為內(nèi)部放電</p><p> </p><p>表面放電：</p><p>如果局部放電是在絕緣體表面的，我們稱之為表面放電。</p><p> </p><p> </p><p>五．干式變壓器試驗(yàn)標(biāo)準(zhǔn)</p><p> </p><p>對(duì)于三相干式變壓器來(lái)說(shuō)</p><p>,</p><p>根據(jù)</p><p>GB1094.11</p><p>—</p><p>2007</p><p>、</p><p>22</p><p>規(guī)定：干式變壓器的預(yù)加電壓相</p><p>間要升到</p><p>1.8U</p><p>n</p><p>,</p><p>時(shí)間為</p><p>30s,</p><p>試驗(yàn)電壓相間</p><p>1.3U</p><p>n</p><p>,</p><p>時(shí)間為</p><p>3min,</p><p>局放要求小于</p><p>10pc,</p><p>U</p><p>n</p><p> </p><p>額定電壓</p><p> </p><p> </p><p> </p><p> </p><p> </p><p> </p><p> </p><p> </p><p> </p><p> </p><p>U</p><p>1</p><p>=1.8U</p><p>n</p><p> </p><p>U</p><p>2</p><p>=1.3U</p><p>n</p><p> </p><p> </p><p>U(kV)</p><p>U</p><p>1</p><p> </p><p> </p><p>30</p><p>秒</p><p> </p><p>3</p><p>分</p><p> </p><p>U</p><p>2</p><p> </p><p>0</p><p>t</p><p> </p><p> </p><p> </p><p> </p><p> </p><p> </p> </div> 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