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rgb(24, 24, 24);"><font style="margin: 0px; padding: 0px;"><span style="margin: 0px; padding: 0px; border: 0px; font: inherit;">電纜的超低頻耐壓</span>試驗方法</font></p><p style="margin: 2px 0px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24);"><font style="margin: 0px; padding: 0px;"> 1．將與試品相連的電器設(shè)備全部脫離試品電纜。</font></p><p style="margin: 2px 0px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24);"><font style="margin: 0px; padding: 0px;"> 2．采用10000V兆歐表對試品電纜各相分別進行絕緣電阻試驗，記錄試驗值。</font></p><p style="margin: 2px 0px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24);"><font style="margin: 0px; padding: 0px;"> 3．試驗電壓峰值：Ｕmax＝3Ｕo，其中Ｕo為電纜導(dǎo)體對地或金屬屏蔽之間的額定工作電壓。例如：額定電壓為10KV電纜，單相額定電壓Ｕo：</font></p><p style="margin: 2px 0px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24);"><font style="margin: 0px; padding: 0px;"> 相額定電壓Ｕo：</font></p><p style="margin: 2px 0px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24);"><font style="margin: 0px; padding: 0px;"> Ｕo＝10/√3kV</font></p><p style="margin: 2px 0px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24);"><font style="margin: 0px; padding: 0px;"> 所以試驗電壓峰值為：Ｕmax＝3Ｕo</font></p><p style="margin: 2px 0px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24);"><font style="margin: 0px; padding: 0px;"> ＝3×10/√3kV</font></p><p style="margin: 2px 0px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24);"><font style="margin: 0px; padding: 0px;"> ＝√3×10kV</font></p><p style="margin: 2px 0px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24);"><font style="margin: 0px; padding: 0px;"> ＝17．32kV</font></p><p style="margin: 2px 0px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24);"><font style="margin: 0px; padding: 0px;"> 4．試驗時間：60分鐘。</font></p><p style="margin: 2px 0px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24);"><font style="margin: 0px; padding: 0px;"> 5．可分相進行測試。試品電纜的電容值在試驗設(shè)備負載容量能力范圍內(nèi)時，可將試品電纜三相線芯并聯(lián)后，同時進行耐壓試驗。</font></p><p style="margin: 2px 0px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24);"><font style="margin: 0px; padding: 0px;"> 6．用隨機附帶的專用柔性連接電纜將試驗設(shè)備與試品電纜相連接。合上電源，設(shè)定好試驗頻率、時間和電壓以及高壓側(cè)的過流保護值、過壓保護值，然后開始升壓試驗。升壓過程應(yīng)密切監(jiān)視高壓回路，<span style="color:#000000;"><span id="quimsyk" class="bjFfcClass">監(jiān)*</span></span>試品電纜是否有異常響聲。升至試驗電壓時，即開始記錄試驗時間并讀取試驗電壓值。</font></p><p style="margin: 2px 0px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24);"><font style="margin: 0px; padding: 0px;"> 7．試驗時間到后，儀器自動停機。試驗中若無破壞性放電發(fā)生，則認為通過耐壓試驗。</font></p><p style="margin: 2px 0px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24);"><font style="margin: 0px; padding: 0px;"> 8．在升壓和耐壓過程中，如發(fā)現(xiàn)輸出波形異?；?，而且電流異常增大，電壓不穩(wěn)，試品電纜發(fā)生異味，煙霧或異常響聲或閃烙等現(xiàn)象，應(yīng)立即停止升壓，停機后查明原因。這些現(xiàn)象如果是試品電纜絕緣部分薄弱引起的，則認為耐壓試驗不合格。如確定是試品電纜由于空氣濕度或表面臟污等原因所致，應(yīng)將試品電纜清潔干燥處理后，再進行試驗。</font></p><p style="margin: 2px 0px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24);"><font style="margin: 0px; padding: 0px;"> 9．試驗過程中，如果遇到非試品電纜絕緣缺陷使儀器出現(xiàn)過流保護，在查明原因后，應(yīng)重新進行全時間連接耐壓試驗。不得僅進行“補足時間”試驗大型高壓發(fā)電機的超低頻耐壓試驗方法對發(fā)電機的超低頻耐壓試驗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補充說明。</font></p><p style="margin: 2px 0px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24);"><font style="margin: 0px; padding: 0px;"> 1．在交接、大修、局部更換繞組以及常規(guī)試驗時，均可進行此項試驗。用0.1Hz超低頻對電機進行耐壓試驗，對發(fā)電機端部絕緣的缺陷比工頻耐壓試驗更有效。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。</font></p><p style="margin: 2px 0px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24);"><font style="margin: 0px; padding: 0px;"> 2．連線方法：試驗時應(yīng)分相進行，被試相加壓，非被試相短接接地。</font></p><p style="margin: 2px 0px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24);"><font style="margin: 0px; padding: 0px;"> 3．按照有關(guān)規(guī)程的要求，試驗電壓峰值可按如下公式確定：</font></p><p style="margin: 2px 0px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24);"><font style="margin: 0px; padding: 0px;"> Ｕmax＝√2βＫUo</font></p><p style="margin: 2px 0px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24);"><font style="margin: 0px; padding: 0px;"> 其中Ｕmax ：為0.1Hz試驗電壓的峰值（kV）</font></p><p style="margin: 2px 0px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24);"><font style="margin: 0px; padding: 0px;"> β：0.1Hz與50Hz電壓的等效系數(shù)，按我國規(guī)程的要求,取1.2Ｋ：通常取1.3∽1.5 一般取1.5</font></p><p style="margin: 2px 0px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24);"><font style="margin: 0px; padding: 0px;"> Ｕo ：發(fā)電機定子繞組額定電壓（kV）例如：額定電壓為13.8 kV的發(fā)電機，超低頻的試驗電壓峰值計算方法為：</font></p><p style="margin: 2px 0px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24);"><font style="margin: 0px; padding: 0px;"> Ｕmax＝√2×1.2×1.5×13.8≈35.1(kV)</font></p><p style="margin: 2px 0px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24);"><font style="margin: 0px; padding: 0px;"> 4．試驗時間按有關(guān)規(guī)程進行</font></p><p style="margin: 2px 0px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24);"><font style="margin: 0px; padding: 0px;"> 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，可以認為絕緣耐受住了試驗的考驗。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)，特別是空冷機組。經(jīng)驗指出，外觀監(jiān)視能發(fā)現(xiàn)儀表所不能反映的發(fā)電機絕緣不正?，F(xiàn)象，如表面電暈、放電等。</font></p><p style="margin: 2px 0px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24);"><font style="margin: 0px; padding: 0px;"> 注意事項</font></p><p style="margin: 2px 0px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24);"><font style="margin: 0px; padding: 0px;"> 1．本儀器所配升壓器不得作它用。</font></p><p style="margin: 2px 0px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24);"><font style="margin: 0px; padding: 0px;"> 2．機內(nèi)帶電,切勿自行拆機修理，以免發(fā)生意外。儀器有故障，應(yīng)與我公司聯(lián)系修理。</font></p><p style="margin: 2px 0px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24);"><font style="margin: 0px; padding: 0px;"> 3．關(guān)機后應(yīng)用放<span style="color:#000000;"><span id="quimsyk" class="bjFfcClass">*棒</span></span>對試品進行充分放電,再拆線。</font></p><p style="margin: 2px 0px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24);"><font style="margin: 0px; padding: 0px;"> Ｕmax＝√2×1.2×1.5×13.8≈35.1(kV)</font></p><p style="margin: 2px 0px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24);"><font style="margin: 0px; padding: 0px;"> 4．試驗時間按有關(guān)規(guī)程進行</font></p><p style="margin: 2px 0px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24);"><font style="margin: 0px; padding: 0px;"> 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，可以認為絕緣耐受住了試驗的考驗。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)，特別是空冷機組。經(jīng)驗指出，外觀監(jiān)視能發(fā)現(xiàn)儀表所不能反映的發(fā)電機絕緣不正?，F(xiàn)象，如表面電暈、放電等。</font></p></div> <div id="quimsyk" class="inside_newsthree"> <p id="newsprev">上一篇：<b class="newsprev"><a href="/Article-2637466.html">常見真空開關(guān)真空度測試儀的介紹</a></b></p> <p 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