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onmouseover="showsubmenu('高壓核相儀')">高壓核相儀</a> <div class="pvhr3jx3r5" id="submenu_高壓核相儀" style="display:none"> <ul> </ul> </div> </li> </ul> </div> </div></div> <div id="pvhr3jx3r5" class="inpage_right"> <div id="pvhr3jx3r5" class="mbx2"><a href="/">首頁</a> > <a href="/article.html">技術(shù)文章</a> > 發(fā)電機(jī)的超低頻耐壓試驗(yàn)方法</div> <div id="pvhr3jx3r5" class="inpage_content"> <div id="pvhr3jx3r5" class="nr_main_box"> <h1 class="inside_rnewtil">發(fā)電機(jī)的超低頻耐壓試驗(yàn)方法</h1> <div id="pvhr3jx3r5" class="inside_rnewtime">點(diǎn)擊次數(shù)：840 更新時(shí)間：2024-01-05</div> <div id="pvhr3jx3r5" class="inside_rnewcon"><p style="line-height:150%"><strong><span style="font-family: 宋體; line-height: 150%; font-size: 16px;">發(fā)電機(jī)的超低頻耐壓試驗(yàn)方法</span></strong></p><p style="text-indent:32px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:16px"><span style="font-family:宋體">對發(fā)電機(jī)的超低頻耐壓試驗(yàn)操作方法與以上對電纜的操作方法相似。下面就不同的地方作重點(diǎn)補(bǔ)充說明。</span></span></p><p style="text-indent:32px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:16px"><span style="font-family:宋體">1、在交接、大修、局部更換繞組以及常規(guī)試驗(yàn)時(shí)，均可進(jìn)行此項(xiàng)試驗(yàn)。用0.1H</span></span><span style=";font-family:宋體;line-height:150%;font-size:16px">z</span><span style=";font-family:宋體;line-height:150%;font-size:16px"><span style="font-family:宋體">超低頻對電機(jī)進(jìn)行耐壓試驗(yàn)，對發(fā)電機(jī)端部絕緣的缺陷比工頻耐壓試驗(yàn)更有效。其原因是在工頻電壓下，由于從線棒流出的電容電流在流經(jīng)絕緣外面的半導(dǎo)體防暈層時(shí)造成了較大的電壓降，因而使端部的線棒絕緣上承受的電壓減??；而在超低頻情況下，此電容電流大大減小了，半導(dǎo)體防暈層上的壓降也大為減小，故端部絕緣上電壓較高，便于發(fā)現(xiàn)缺陷。</span></span></p><p style="text-indent:32px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:16px"><span style="font-family:宋體">2、連線方法：試驗(yàn)時(shí)應(yīng)分相進(jìn)行，被試相加壓，非被試相短接接地。如圖</span></span><span style=";font-family:宋體;line-height:150%;font-size:16px"><span style="font-family:宋體">10</span></span><span style=";font-family:宋體;line-height:150%;font-size:16px"><span style="font-family:宋體">所示</span></span></p><p style="text-indent:32px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:16px"><span style="font-family:宋體">3、按照有關(guān)規(guī)程的要求，試驗(yàn)電壓峰值可按如下公式確定：</span></span></p><p style="text-indent:176px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:16px"><span style="font-family:宋體">Ｕ</span></span><span style=";font-family:宋體;line-height:150%;font-size:16px">max</span><span style=";font-family:宋體;line-height:150%;font-size:16px"><span style="font-family:宋體">＝</span><span style="font-family:宋體">√2βＫUo</span></span></p><p style="line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:16px"> </span><span style=";font-family:宋體;line-height:150%;font-size:16px"><span style="font-family:宋體">其中Ｕ</span></span><span style=";font-family:宋體;line-height:150%;font-size:16px">max </span><span style=";font-family:宋體;line-height:150%;font-size:16px"><span style="font-family:宋體">：為</span><span style="font-family:宋體">0.1H</span></span><span style=";font-family:宋體;line-height:150%;font-size:16px">z</span><span style=";font-family:宋體;line-height:150%;font-size:16px"><span style="font-family:宋體">試驗(yàn)電壓的峰值（</span></span><span style=";font-family:宋體;line-height:150%;font-size:16px"><span style="font-family:宋體">kV</span></span><span style=";font-family:宋體;line-height:150%;font-size:16px"><span style="font-family:宋體">）</span></span></p><p style="margin-left:159px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:16px"><span style="font-family:宋體">β：0.1H</span></span><span style=";font-family:宋體;line-height:150%;font-size:16px">z</span><span style=";font-family:宋體;line-height:150%;font-size:16px"><span style="font-family:宋體">與</span><span style="font-family:宋體">50H</span></span><span style=";font-family:宋體;line-height:150%;font-size:16px">z</span><span style=";font-family:宋體;line-height:150%;font-size:16px"><span style="font-family:宋體">電壓的等效系數(shù)，按我國規(guī)程的要求</span><span style="font-family:宋體">,取1.2</span></span></p><p style="text-indent:95px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:16px"><span style="font-family:宋體">Ｋ：通常取</span><span style="font-family:宋體">1.3∽1.5 　一般取1.5</span></span></p><p style="text-indent:95px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:16px"><span style="font-family:宋體">Ｕ</span></span><span style=";font-family:宋體;line-height:150%;font-size:16px">o </span><span style=";font-family:宋體;line-height:150%;font-size:16px"><span style="font-family:宋體">：發(fā)電機(jī)定子繞組額定電壓（</span></span><span style=";font-family:宋體;line-height:150%;font-size:16px"><span style="font-family:宋體">kV</span></span><span style=";font-family:宋體;line-height:150%;font-size:16px"><span style="font-family:宋體">）</span></span></p><p style="text-indent:32px;text-align:center;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:16px"><span style="font-family:宋體">例如：額定電壓為</span><span style="font-family:宋體">13.8</span></span><span style=";font-family:宋體;line-height:150%;font-size:16px"> <span style="font-family:宋體">kV</span></span><span style=";font-family:宋體;line-height:150%;font-size:16px"><span style="font-family:宋體">的發(fā)電機(jī)，超低頻的試驗(yàn)電壓峰值計(jì)算方法為：</span> </span></p><p style="text-indent: 32px; line-height: 150%;"><span style=";font-family:宋體;line-height:150%;font-size:16px"><span style="font-family:宋體">Ｕ</span></span><span style=";font-family:宋體;line-height:150%;font-size:16px">max</span><span style=";font-family:宋體;line-height:150%;font-size:16px"><span style="font-family:宋體">＝</span></span><img src="https://img55.chem17.com/9/20240105/638400376777478641963.png" width="26" height="23" title="7_Z_YAX}}5W62E)STIP2@GA.png" alt="7_Z_YAX}}5W62E)STIP2@GA.png" style="text-align: center; max-width: 800px; max-height: 300%;"/><span style="text-align: center; font-family: 宋體; line-height: 150%; font-size: 16px;">×</span><span style="text-align: center; font-family: 宋體; line-height: 150%; font-size: 16px;">1.2</span><span style="text-align: center; font-family: 宋體; line-height: 150%; font-size: 16px;">×</span><span style="text-align: center; font-family: 宋體; line-height: 150%; font-size: 16px;">1.5</span><span style="text-align: center; font-family: 宋體; line-height: 150%; font-size: 16px;">×</span><span style="text-align: center; font-family: 宋體; line-height: 150%; font-size: 16px;">13.8</span><span style="text-align: center; font-family: 宋體; line-height: 150%; font-size: 16px;">≈</span><span style="text-align: center; font-family: 宋體; line-height: 150%; font-size: 16px;">35.1(</span><span style="text-align: center; font-family: 宋體; line-height: 150%; font-size: 16px;">kV</span><span style="text-align: center; font-family: 宋體; line-height: 150%; font-size: 16px;">)</span></p><p style="text-indent:32px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:16px"><span style="font-family:宋體">4、試驗(yàn)時(shí)間按有關(guān)規(guī)程進(jìn)行</span></span></p><p><span style=";font-family:宋體;font-size:16px"><span style="font-family:宋體">5、在耐壓過程中，若無異常聲響、氣味、冒煙以及數(shù)據(jù)顯示不穩(wěn)定等現(xiàn)象，可以認(rèn)為絕緣耐受住了試驗(yàn)的考驗(yàn)。為了更好地了解絕緣情況，應(yīng)盡可能全面監(jiān)視絕緣的表面狀態(tài)，特別是空冷機(jī)組。經(jīng)驗(yàn)指出，外觀監(jiān)視能發(fā)現(xiàn)儀表所不能反映的發(fā)電機(jī)絕緣不正常現(xiàn)象，如表面電暈、放電等。</span></span></p><p> </p><p style="text-align: center"><img style="max-width:800px;max-height:300%;" src="https://img49.chem17.com/9/20240105/638400377858682255836.png" title="MU@@21RPDI8[FQ%869WBY4F.png" alt="MU@@21RPDI8[FQ%869WBY4F.png"/></p><p> </p><p><span style=";font-family:宋體;font-size:16px"> </span><span style=";font-family:宋體;font-size:16px"><span style="font-family:宋體">測量定子的某相連線圖</span></span></p><p><br/></p></div> <div id="pvhr3jx3r5" class="inside_newsthree"> <p id="newsprev">上一篇：<b class="newsprev"><a 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