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c-news"> <div id="iqaqewgi6e" class="newsnr"> <h1>高壓試驗變壓器的故障分析</h1> <p class="source"><span>日期：2020-11-19</span><span>瀏覽：1065次</span></p> <div> <p style="margin: 2px 0px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 18.6667px; line-height: inherit; font-family: 宋體; color: rgb(0, 0, 0);"><font style="font-size: 15px; font-family: 微軟雅黑, Arial, 宋體; margin: 0px; padding: 0px;"> 儀器檢查及故障原因分析：控制箱內(nèi)的控制回路升壓正常，輸入、輸出正常；連接導線用萬用表歐姆檔測試，也顯示正常；因此判斷可能是高壓試驗變壓器故障。從原理圖可看出，高壓試驗變壓器有3個同心線圈—原邊線圈、高壓輸出線圈、儀表線圈。工作時，控制箱內(nèi)電壓回路接通后，通過自耦調(diào)壓器的調(diào)節(jié)，使高壓試驗變壓器的原邊線圈與高壓輸出線圈的比例關(guān)系不變，而其匝數(shù)遠遠小于高壓輸出線圈，故從儀表上可讀取升壓值。將試驗變壓器拆開后檢查發(fā)現(xiàn)，變壓器原邊線圈、高壓輸出線圈均無異常，而儀表線圈有明顯的過熱痕跡，因此判斷為儀表線圈燒毀。</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: 18.6667px; line-height: inherit; font-family: 宋體; color: rgb(0, 0, 0);"><font style="font-size: 15px; font-family: 微軟雅黑, Arial, 宋體; margin: 0px; padding: 0px;"> 檢查儀表線圈，其所使用導線為0．3mm 。分析燒毀原因，應該是由于線圈芯線的截面積較小，載負荷能力差，致使在儀器升壓工作過程中當泄漏電流較大時，將線圈燒毀。儀器兩次故障現(xiàn)象相同，均是該原因造成的，由于線徑是在設計裝配過程中選型決定的，所以在上次返廠修理時，問題沒有得到*的解決。</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: 18.6667px; line-height: inherit; font-family: 宋體; color: rgb(0, 0, 0);"><font style="font-size: 15px; font-family: 微軟雅黑, Arial, 宋體; margin: 0px; padding: 0px;"> 處理方法:</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: 18.6667px; line-height: inherit; font-family: 宋體; color: rgb(0, 0, 0);"><font style="font-size: 15px; font-family: 微軟雅黑, Arial, 宋體; margin: 0px; padding: 0px;"> 辦法是更換儀表線圈。儀表線圈與另外兩個線圈的排列順序是——從鐵心向外，依此為儀表線圈、高壓輸出線圈、原邊線圈(即一次線圈)。更換儀表線圈，在較潔凈的房間內(nèi)，將鐵心硅鋼片一一拆開，然后將原邊線圈、高壓輸出線圈依次取下，用白布分別包好、放好，防止塵土及異物，以備裝配；測量好儀表線圈的原繞制成型的數(shù)據(jù)，然后將已燒毀的儀表線圈取下，選用截面積較大、載負荷能力較高的0．45mm 的漆包線，按原來的儀表線圈匝數(shù)及裝配外型尺寸重新繞制。繞制完成后浸漆、干燥。開始裝配，先將儀表線圈按原樣裝好，再將高壓輸出線圈、原邊線圈按原來的位置安裝好，將700多片硅鋼片重新按原型裝配。后對高壓試驗變壓器的變壓器油進行了更新。</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: 18.6667px; line-height: inherit; font-family: 宋體; color: rgb(0, 0, 0);"><font style="font-size: 15px; font-family: 微軟雅黑, Arial, 宋體; margin: 0px; padding: 0px;"> 將修好的儀器進行空載試驗、帶負荷試驗，顯示正常；與另外的一套儀器升壓試驗比較，結(jié)果良好，達到了工況要求。</font></p> <div id="iqaqewgi6e" class="clear"></div> </div> <div id="iqaqewgi6e" class="article"> <p>上一篇：<a href="/Article-2454062.html">交直流數(shù)字高壓表的使用說明</a></p> <p>下一篇：<a href="/Article-2454057.html">全自動變比組別測試儀的參數(shù)及特性</a></p> </div> <div id="iqaqewgi6e" class="clear"></div> </div> </div> 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