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16px;">電壓互感器交流耐壓試驗方法及注意事項</span></p><p><span style="font-size: 16px;"><span style="font-family: 微軟雅黑; font-size: 15px;">一、電壓互感器功能及結構介紹</span><br style="font-family: 微軟雅黑; font-size: 15px;"/><span style="font-family: 微軟雅黑; font-size: 15px;">二、電壓互感器按照一次繞組兩端的絕緣水平可以分為非接地電壓互感器（全絕緣）和接地電壓互感器（分級絕緣）。非接地電壓互感器是指包括接線端子在內的一次繞組各個部分都是按絕緣水平對地絕緣的電壓互感器，其交流耐壓試驗包括外施工頻耐壓試驗及感應耐壓試驗；接地電壓互感器是指一次繞組的一端直接接地的單相電壓互感器，或一次繞組的星形聯(lián)結點為直接接地的三相電壓互感器，如串級式電壓互感器，其交流耐壓試驗通過倍頻感應耐壓試驗進行，進行工頻耐壓僅能考核其接地端（N）的絕緣水平。</span><br style="font-family: 微軟雅黑; font-size: 15px;"/><span style="font-family: 微軟雅黑; font-size: 15px;">三、二、試驗前準備工作：</span><br style="font-family: 微軟雅黑; font-size: 15px;"/><span style="font-family: 微軟雅黑; font-size: 15px;">四、1、準備合格周期內試驗用設備、儀器儀表及工具。</span><br style="font-family: 微軟雅黑; font-size: 15px;"/><span style="font-family: 微軟雅黑; font-size: 15px;">五、2、查閱被試互感器的試驗資料各項試驗結果是否合格。</span><br style="font-family: 微軟雅黑; font-size: 15px;"/><span style="font-family: 微軟雅黑; font-size: 15px;">3、將被試互感器放電。</span><br style="font-family: 微軟雅黑; font-size: 15px;"/><span style="font-family: 微軟雅黑; font-size: 15px;">4、4、檢查互感器外殼、底座、鐵心（如果要求接地）應可靠接地，套管表面應潔凈。</span><br style="font-family: 微軟雅黑; font-size: 15px;"/><span style="font-family: 微軟雅黑; font-size: 15px;">5、5、拆除互感器各側外部接線，外部引線應與線端保持足夠的安全距離并固定好。</span><br style="font-family: 微軟雅黑; font-size: 15px;"/><span style="font-family: 微軟雅黑; font-size: 15px;">6、6、試驗現(xiàn)場周圍裝設試驗圍欄，必要時派專人看守。</span><br style="font-family: 微軟雅黑; font-size: 15px;"/><span style="font-family: 微軟雅黑; font-size: 15px;">7、7、抄錄銘牌、記錄天氣情況和溫、濕度、安裝位置、試驗日期。</span><br style="font-family: 微軟雅黑; font-size: 15px;"/><span style="font-family: 微軟雅黑; font-size: 15px;">8、三、試驗的目的及方法</span><br style="font-family: 微軟雅黑; font-size: 15px;"/><span style="font-family: 微軟雅黑; font-size: 15px;">9、3.1測量目的：</span><br style="font-family: 微軟雅黑; font-size: 15px;"/><span style="font-family: 微軟雅黑; font-size: 15px;">10、交流耐壓試驗是鑒定電氣設備絕緣強度最直接的方法，它對于判斷電氣設備能否投入運行具有決定性的意義，也是保證設備絕緣水平，避免發(fā)生絕緣事故的重要手段。交流耐壓試驗是破壞性試驗。被試品的絕緣電阻等常規(guī)絕緣試驗結果合格后方能進行交流耐壓試驗，若發(fā)現(xiàn)設備的絕緣情況不良(如受潮和局部缺陷等)，應*行處理合格后再做交流耐壓試驗，避免造成不應有的絕緣擊穿。</span><br style="font-family: 微軟雅黑; font-size: 15px;"/><span style="font-family: 微軟雅黑; font-size: 15px;">11、3.2外施工頻耐壓試驗方法和內容</span><br style="font-family: 微軟雅黑; font-size: 15px;"/><span style="font-family: 微軟雅黑; font-size: 15px;">12、1）將一次繞組兩端短接，其它二次繞組尾端及外殼接地</span><br style="font-family: 微軟雅黑; font-size: 15px;"/><span style="font-family: 微軟雅黑; font-size: 15px;">2）按圖連接好調壓器、試驗變壓器、保護電阻，將電源接入調壓器，檢查所有試驗設備、儀表儀器接線正確、指示正確后，操作人員征得試驗負責人許可，合上開關，空升加壓回路，無異常后，降壓至零，斷開電源，將試驗變壓器高壓輸出接至被試互感器一次繞組，應確保加壓引線和周圍物體的絕緣距離，必要時用絕緣桿將引線支撐牢固。</span><br style="font-family: 微軟雅黑; font-size: 15px;"/><span style="font-family: 微軟雅黑; font-size: 15px;">3）升壓必須從零開始，且不可沖擊合閘。升壓速度在75％試驗電壓前是可以任意的，自75％試驗電壓以后開始均勻升壓，約每秒2％速率的試驗電壓上升至試驗電壓，計時1分鐘后，迅速均勻降壓到零（或1/3試驗電壓以下），然后斷開電源，用放電棒將被試繞組和試驗變壓器的高壓部分接地，并充分放電。</span><br style="font-family: 微軟雅黑; font-size: 15px;"/><span style="font-family: 微軟雅黑; font-size: 15px;">4）3）參照上述方法進行二次繞組耐壓試驗。</span><br style="font-family: 微軟雅黑; font-size: 15px;"/><span style="font-family: 微軟雅黑; font-size: 15px;">5）4）試驗過程應有人監(jiān)護并呼唱，試驗人員在試驗中注意力應高度集中，隨時警戒異常情況的發(fā)生。</span><br style="font-family: 微軟雅黑; font-size: 15px;"/><span style="font-family: 微軟雅黑; font-size: 15px;">6）5）試驗過程中保持觀察,若出現(xiàn)異常，應停止試驗，查明原因后再繼續(xù)進行。</span><br style="font-family: 微軟雅黑; font-size: 15px;"/><span style="font-family: 微軟雅黑; font-size: 15px;">7）6）耐壓試驗前后均應進行絕緣電阻的測量。</span><br style="font-family: 微軟雅黑; font-size: 15px;"/><span style="font-family: 微軟雅黑; font-size: 15px;">8）7）全部試驗結束，應先斷開試驗電源，再開始拆線，最后拆除接地線。</span><br style="font-family: 微軟雅黑; font-size: 15px;"/><span style="font-family: 微軟雅黑; font-size: 15px;">9）3.3感應耐壓試驗方法和內容：</span><br style="font-family: 微軟雅黑; font-size: 15px;"/><span style="font-family: 微軟雅黑; font-size: 15px;">10）感應耐壓試驗是對二次繞組施加一足夠的勵磁電壓，使一次繞組感應出規(guī)定的試驗電壓值。</span><br style="font-family: 微軟雅黑; font-size: 15px;"/><span style="font-family: 微軟雅黑; font-size: 15px;">11）1）對于非接地電壓互感器，先將其一次繞組的一端接地，對于接地電壓互感器，將一次繞組接地端（N）接地。各二次繞組的一個端子接地，外殼、底座接地。</span><br style="font-family: 微軟雅黑; font-size: 15px;"/><span style="font-family: 微軟雅黑; font-size: 15px;">2）連接好三倍頻或多倍頻試驗裝置，將試驗電源接入試驗裝置，檢查所有試驗設備、儀表儀器接線正確、指示正確，操作人員征得試驗負責人許可后，合上開關，空升加壓回路，無異常后，降壓至零，斷開電源，將三倍頻或多倍頻感應耐壓試驗裝置的輸出接在二次繞組a,n上勵磁加壓，對于電容電流較大的，可采用補償電抗器接到輔助繞組da,dn上。也可以在輔助繞組da,dn上加壓，補償電抗器接到二次繞組a,n上。勵磁繞組應選擇容量較大的二次繞組為宜。分壓器高壓端與一次繞組線端A相連。</span><br style="font-family: 微軟雅黑; font-size: 15px;"/><span style="font-family: 微軟雅黑; font-size: 15px;">12）應確保加壓引線和周圍物體的絕緣距離，必要時用絕緣桿將引線支撐牢固。</span><br style="font-family: 微軟雅黑; font-size: 15px;"/><span style="font-family: 微軟雅黑; font-size: 15px;">13）4）當試驗電壓頻率等于或小于2倍額定頻率時，試驗時間為60s；當試驗電壓頻率大于2倍額定頻率時，試驗時間為：試驗頻率/額定頻率120(s)，但不少于15s。對于非接地電壓互感器，應對每一線端施加試驗電壓，持續(xù)時間均為規(guī)定時間的一半，但最少為15s。</span><br style="font-family: 微軟雅黑; font-size: 15px;"/><span style="font-family: 微軟雅黑; font-size: 15px;">14）5)試驗過程應有人監(jiān)護并呼唱，試驗人員在試驗中注意力應高度集中，隨時警戒異常情況的發(fā)生。試驗過程中保持觀察，若出現(xiàn)異常，應停止試驗，查明原因后再繼續(xù)進行。</span><br style="font-family: 微軟雅黑; font-size: 15px;"/><span style="font-family: 微軟雅黑; font-size: 15px;">15）6)試驗結束，應先斷開試驗電源，用放*棒將被試繞組和試驗變壓器的高壓部分接地，并充分放電后，再開始拆線，最后拆除接地線。</span></span><br/></p></div> <div id="quimsyk" class="inside_newsthree"> <p id="newsprev">上一篇：<b class="newsprev"><a href="/Article-3375179.html">異頻介質損耗測試儀工作原理</a></b></p> <p id="newsnext">下一篇：<b class="newsnext"><a href="/Article-3364721.html">互感器變比測試儀的使用方法</a></b></p> <span><a href="/article.html">返回列表>></a></span> </div> </div> </div> </div> </div>    <div class="quimsyk" id="z_Footer"> <div id="quimsyk" class="pz_down"> <div id="quimsyk" class="w_1200"> <div id="quimsyk" class="footT"> <div id="quimsyk" class="footAddr"> <div id="quimsyk" class="footTit">上?？档请姎饪萍加邢薰?/div> <div id="quimsyk" class="dAddr"><img class="ico" src="/Skins/329197/images/icon_foot1.png">地址：上海市普陀區(qū)金通路1118弄6號</div> <div id="quimsyk" 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