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class="inside_rnewcon"><p><span style="font-size: 16px;"><strong>工頻耐壓試驗過程中現場操作注意事項</strong></span></p><p><span style="font-size: 16px; background-color: rgb(255, 255, 255); color: rgb(59, 59, 59); font-family: 宋體;"> 由于工頻耐壓試驗是一種破壞性試驗，試驗所施加的試驗電壓往往是變壓器額定電壓的數倍，過高的電壓會使絕緣介質損失增大、發(fā)熱、放電會加速絕緣缺陷的發(fā)展，故在對變壓器進行工頻耐壓試驗時應根據絕緣介質的不同及變壓器的運行狀況的不同，按照有關規(guī)程及試驗標準選取相應的試驗電壓。<br/></span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(59, 59, 59); font-family: 宋體; background-color: rgb(255, 255, 255);"><span style="font-size: 16px;">??接好試驗接線后，應經另一名試驗人員檢查，確認無誤后方可加壓試驗。</span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(59, 59, 59); font-family: 宋體; background-color: rgb(255, 255, 255);"><span style="font-size: 16px;">??加壓前，首先檢查調壓器是否在零位。調壓器在零位方可加壓，升壓時應呼唱。不允許在規(guī)定試驗電壓值的1/3以上沖擊合閘。一般的試驗設備都在內部控制回路上限制了從非零位升壓。應盡快的增加至試驗電壓值，當試驗電壓升到75%以上時，一般應以每秒2%試驗電壓的速率升壓，防止變壓器在接近規(guī)定試驗電壓值時的耐壓時間過長，也便于觀察試驗電壓。升壓過程中應觀察測量裝置的指示是否正常，當保護動作后，應分析原因，消除后再進行試驗。</span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(59, 59, 59); font-family: 宋體; background-color: rgb(255, 255, 255);"><span style="font-size: 16px;"><span style="font-size: 16px; margin: 0px; padding: 0px;">??</span>加壓至規(guī)定時間，無特別要求時，均為60S，應將電壓迅速地降低到試驗電壓的1/3以下，才能分閘切斷電源。工頻耐壓試驗屬于破壞性試驗，耐壓時間不應過長，以免引起不必要的絕緣損傷。禁止在電壓值較高的情況下就切斷電源，避免可能發(fā)生的瞬變過程而產生使試品放電或擊穿、測量儀表損壞的過電壓。</span></p><p style="text-align: center"><img style="max-width: 800px; max-height: 300%; width: 800px; height: 600px;" src="https://img63.chem17.com/9/20220816/637962317627441027359.png" title="(]()4JI_)NJ`O6$5GWG4A%U.png" alt="(]()4JI_)NJ`O6$5GWG4A%U.png" width="800" height="600" border="0" vspace="0"/></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(59, 59, 59); font-family: 宋體; background-color: rgb(255, 255, 255);"><span style="font-size: 16px;">??在試驗過程中，若由于空氣的度、設備表面臟污等影響，引起試品表面閃絡放電或空氣擊穿，不能認為不合格，應在清潔處理后、適宜的環(huán)境條件下再試驗。若在試驗過程中發(fā)生放電或擊穿現象應立即切斷電源，因為在放電或擊穿后產生高頻率的過電壓，相當于截波沖擊，持續(xù)作用下會損傷變壓器的縱絕緣，使匝間、層間、斷間擊穿。</span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(59, 59, 59); font-family: 宋體; background-color: rgb(255, 255, 255);"><span style="font-size: 16px;">??工頻耐壓試驗應采用不小于80%額定頻率的任一合適的頻率，且波形盡可能接近于正弦波的單相交流電壓進行。應測量電壓的峰值，試驗電壓值應是測量電壓的峰值除以。</span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(59, 59, 59); font-family: 宋體; background-color: rgb(255, 255, 255);"><span style="font-size: 16px;">??變壓器工頻耐壓試驗結果判斷。按 GB1094.3-1985第10條規(guī)定“如果未發(fā)現內部絕緣擊穿或局部損傷，則試驗合格"。而新標準 GB1094.3-2003第11條規(guī)定“如果試驗電壓不出現突然下降，則試驗合格。"</span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(59, 59, 59); font-family: 宋體; background-color: rgb(255, 255, 255);"><span style="font-size: 16px;">??需特別注意，被試品為有機絕緣材料時，試驗后應立即觸摸，如出現普遍或局部發(fā)熱，則說明絕緣不良，應盡快處理后再做試驗。耐壓試驗前后均應測量被試品的絕緣電阻。對夾層絕緣或有機絕緣材料的設備，如果耐壓試驗后的絕緣電阻，比耐壓前下降 30%，應查明原因。若試品表面瓷套釉層絕緣損壞、老化或有裂紋，應視為不合格。</span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(59, 59, 59); font-family: 宋體; background-color: rgb(255, 255, 255);"><span style="font-size: 16px;">??在對多臺變壓器進行工頻耐壓試驗時，應將擊穿的變壓器及時作上明顯的不易脫落標示牌。</span></p></div> <div id="quimsyk" class="inside_newsthree"> <p id="newsprev">上一篇：<b class="newsprev"><a href="/Article-3108714.html">三相微機繼電保護測試儀使用方法</a></b></p> <p id="newsnext">下一篇：<b class="newsnext"><a href="/Article-3104828.html">工頻耐壓試驗裝置如何配置選型</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 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