直流高壓發(fā)生器直流試驗(yàn)的應(yīng)用-上?？档请姎饪萍加邢薰?/title> <link type="text/css" rel="stylesheet" href="/Skins/106676/css/index.css" /> <script src="/skins/106676/js/jquery-3.6.0.min.js"></script> <link rel="stylesheet" type="text/css" href="/skins/106676/css/swiper.min.css"> <script type="text/javascript" src="/skins/106676/js/swiper.min.js"></script>  <script language="javascript" type="text/javascript"> var nav= '5'; var menu= '0'; </script>  <link rel="shortcut icon" href="/skins/106676/favicon.ico"> <script type="application/ld+json"> { "@context": "https://ziyuan.baidu.com/contexts/cambrian.jsonld", "@id": "http:///Article-2491273.html", "title": "直流高壓發(fā)生器直流試驗(yàn)的應(yīng)用", "pubDate": "2020-12-20T10:14:23", "upDate": "2020-12-20T10:14:23" }</script> <script language="javaScript" src="/js/JSChat.js"></script><script language="javaScript">function ChatBoxClickGXH() { DoChatBoxClickGXH('https://chat.chem17.com',83189) }</script><script>!window.jQuery && document.write('<script 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onblur="if(this.value=='')this.value='請(qǐng)輸入您要查詢的產(chǎn)品'" onfocus="this.value=''" value="請(qǐng)輸入您要查詢的產(chǎn)品" type="text" class="search-txt"> <input name="" type="submit" class="search-btn" value=""> </form> </div> <div id="iqaqewgi6e" class="clear"></div> </div> </div> <div id="iqaqewgi6e" class="nybanner"><img src="/skins/106676/images/nybanner.jpg"></div> <script src="http://www.chem17.com/mystat.aspx?u=mbdzkj"></script>  <div id="iqaqewgi6e" class="ncontent w_1100"> <div id="iqaqewgi6e" class="h-6">技術(shù)文章<span>您當(dāng)前的位置：<a href="/">首頁(yè)</a> > <a href="/article.html">技術(shù)文章</a> > 直流高壓發(fā)生器直流試驗(yàn)的應(yīng)用</span></div>  <div id="iqaqewgi6e" class="n-3 c-news"> <div id="iqaqewgi6e" class="newsnr"> <h1>直流高壓發(fā)生器直流試驗(yàn)的應(yīng)用</h1> <p class="source"><span>日期：2020-12-20</span><span>瀏覽：1140次</span></p> <div> <p style="margin: 0px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: 2em; font-family: Arial, "Microsoft YaHei", 黑體, sans-serif, Tahoma; vertical-align: baseline; box-sizing: border-box; text-align: justify;"><span style="border:0px; box-sizing:border-box; font-family:微軟雅黑,microsoft yahei; font-size:16px; font-stretch:inherit; font-style:inherit; font-variant:inherit; font-weight:inherit; line-height:inherit; margin:0px; padding:0px; vertical-align:baseline"> 電纜的某一段絕緣層破壞，某個(gè)部位嚴(yán)重受潮，接頭工藝把握不嚴(yán)格，封堵不嚴(yán)密等等，都是可能的故障源，但由于電纜距離較長(zhǎng)，通過機(jī)械排查的辦法，費(fèi)時(shí)費(fèi)力，而且難以發(fā)現(xiàn)內(nèi)部缺陷。利用直流高壓試驗(yàn)，可以在首先確定電纜實(shí)際故障程度的前提犀通過緩慢升壓來查找具體的故障部位。例如，工礦現(xiàn)場(chǎng)連接于上級(jí)變電站大功率變壓器出口端的長(zhǎng)距離高壓輸電電垃如果存在上述故障點(diǎn)，極有可能造成輸電過程中因泄漏電流過大引發(fā)上級(jí)變電站的供電設(shè)備頻發(fā)過電流跳閘或者開關(guān)速斷跳閘現(xiàn)象。</span></p><p style="margin: 0px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: 2em; font-family: Arial, "Microsoft YaHei", 黑體, sans-serif, Tahoma; vertical-align: baseline; box-sizing: border-box; text-align: justify;"><span style="border:0px; box-sizing:border-box; font-family:微軟雅黑,microsoft yahei; font-size:16px; font-stretch:inherit; font-style:inherit; font-variant:inherit; font-weight:inherit; line-height:inherit; margin:0px; padding:0px; vertical-align:baseline"> <img alt="" src="http://img78.chem17.com/9/20201220/637440559872015098419.png" style="height:280px; width:282px" /></span></p><p style="margin: 18px 0px 0px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: 2em; font-family: Arial, "Microsoft YaHei", 黑體, sans-serif, Tahoma; vertical-align: baseline; box-sizing: border-box; text-align: justify;"><span style="border:0px; box-sizing:border-box; font-family:微軟雅黑,microsoft yahei; font-size:16px; font-stretch:inherit; font-style:inherit; font-variant:inherit; font-weight:inherit; line-height:inherit; margin:0px; padding:0px; vertical-align:baseline">　　這個(gè)時(shí)候，采用直流高壓發(fā)生器進(jìn)行直流耐壓檢測(cè)的辦法可以迅速幫助我們定位接頭的故障位置。我們可以于電纜端頭施加直流電壓，嚴(yán)密監(jiān)視泄漏電流數(shù)值，在各個(gè)電纜接頭所處的區(qū)域里，用觀察和聲測(cè)等直觀方法，就可能準(zhǔn)確地判斷出損壞的位置。在對(duì)這些部位進(jìn)行處理、修補(bǔ)以后，再借助直流高壓檢測(cè)，記錄泄漏電流的數(shù)值和變化趨勢(shì)，就可以判斷接頭維修是否達(dá)到規(guī)定的要求，從而確定故障電纜是缺陷便不易被發(fā)現(xiàn)。</span></p><p style="margin: 18px 0px 0px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: 2em; font-family: Arial, "Microsoft YaHei", 黑體, sans-serif, Tahoma; vertical-align: baseline; box-sizing: border-box; text-align: justify;"><span style="border:0px; box-sizing:border-box; font-family:微軟雅黑,microsoft yahei; font-size:16px; font-stretch:inherit; font-style:inherit; font-variant:inherit; font-weight:inherit; line-height:inherit; margin:0px; padding:0px; vertical-align:baseline">　　直流耐壓試驗(yàn)的目的是檢查電纜本身的絕緣強(qiáng)度，所以泄漏電流的測(cè)定需要兼顧an全和zhun確兩個(gè)方面。就an全性來說，微安表接在低壓側(cè)較好，試驗(yàn)過程中便于調(diào)整微安表的位置或視角，盡可能避免高壓環(huán)境中的作業(yè)危險(xiǎn)，但在這種接法犀電流通道中的雜散電流與主回路電流一同流經(jīng)微安表，對(duì)測(cè)量精度帶來一定影響。</span></p><p style="margin: 18px 0px 0px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: 2em; font-family: Arial, "Microsoft YaHei", 黑體, sans-serif, Tahoma; vertical-align: baseline; box-sizing: border-box; text-align: justify;"><span style="border:0px; box-sizing:border-box; font-family:微軟雅黑,microsoft yahei; font-size:16px; font-stretch:inherit; font-style:inherit; font-variant:inherit; font-weight:inherit; line-height:inherit; margin:0px; padding:0px; vertical-align:baseline">　　故權(quán)衡測(cè)量需要，可將微安表裝設(shè)于測(cè)試xi統(tǒng)的高壓端，同時(shí)做好表體對(duì)地的絕緣和屏蔽，并在接觸性操作中配備絕緣棒。不同的直流高壓發(fā)生器，硅整流堆所能承受的反向工作電壓不同，圖中這種整流電路，考慮交流電壓的峰值，電源的浪涌電壓，負(fù)載的自感電壓，電源和濾波電容的電壓疊加等等因素，從設(shè)備使用的角度來講，其反向工作電壓限制在硅整流堆反向峰值電壓的一半以內(nèi)，方能保證整流元件的持續(xù)安全工作。</span></p><p style="margin: 18px 0px 0px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: 2em; font-family: Arial, "Microsoft YaHei", 黑體, sans-serif, Tahoma; vertical-align: baseline; box-sizing: border-box; text-align: justify;"><span style="border:0px; box-sizing:border-box; font-family:微軟雅黑,microsoft yahei; font-size:16px; font-stretch:inherit; font-style:inherit; font-variant:inherit; font-weight:inherit; line-height:inherit; margin:0px; padding:0px; vertical-align:baseline">　　如果整流堆串聯(lián)運(yùn)行，就應(yīng)該對(duì)元件采取均壓措施，以防止某一元件承受的分電壓過大，超過單元件的設(shè)計(jì)額定承載能力而損壞。若無(wú)可行的均壓手段，就應(yīng)把整流堆的使用電壓作適當(dāng)降低。使用交流電壓進(jìn)行電壓試驗(yàn)時(shí)，在電壓交變的一個(gè)周期內(nèi)，電壓將兩次達(dá)到峰值，在這兩個(gè)峰值點(diǎn)，無(wú)論電壓的極性正負(fù)，被測(cè)對(duì)象都將承受電壓。</span></p><p style="margin: 18px 0px 0px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: 2em; font-family: Arial, "Microsoft YaHei", 黑體, sans-serif, Tahoma; vertical-align: baseline; box-sizing: border-box; text-align: justify;"><span style="border:0px; box-sizing:border-box; font-family:微軟雅黑,microsoft yahei; font-size:16px; font-stretch:inherit; font-style:inherit; font-variant:inherit; font-weight:inherit; line-height:inherit; margin:0px; padding:0px; vertical-align:baseline">　　而采用直流高壓發(fā)生器進(jìn)行直流電壓測(cè)試時(shí)，直流試驗(yàn)電壓需要達(dá)到交流試驗(yàn)電壓有效值的倍，才可以與交流電壓峰值等值，例如，1500V交流電壓，對(duì)應(yīng)于能夠產(chǎn)生同等電應(yīng)力的直流電壓就應(yīng)該是2121V。同時(shí)，由于直流耐壓試驗(yàn)電壓較高，對(duì)于發(fā)現(xiàn)絕緣的某些局部缺陷具有特殊作用，而且，與交流耐壓試驗(yàn)相比，直流耐壓試驗(yàn)的設(shè)備更為輕便，對(duì)被測(cè)物的絕緣損傷相對(duì)更小，也較易于發(fā)現(xiàn)測(cè)試對(duì)象的局部缺陷。</span></p><p style="margin: 18px 0px 0px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: 2em; font-family: Arial, "Microsoft YaHei", 黑體, sans-serif, Tahoma; vertical-align: baseline; box-sizing: border-box; text-align: justify;"><span style="border:0px; box-sizing:border-box; font-family:微軟雅黑,microsoft yahei; font-size:16px; font-stretch:inherit; font-style:inherit; font-variant:inherit; font-weight:inherit; line-height:inherit; margin:0px; padding:0px; vertical-align:baseline">　　同時(shí)應(yīng)該注意到，試驗(yàn)數(shù)據(jù)都會(huì)因環(huán)境、儀器儀表精度和其他因素的影響而產(chǎn)生誤差，直流高壓試驗(yàn) 當(dāng)然不會(huì)例外。電力電纜的實(shí)際泄漏電流值可能與微安表終示值存在一定差距，這是因?yàn)椋绷鞲邏喊l(fā)生裝置在空載升壓達(dá)到規(guī)定試壓電壓的時(shí)候，也會(huì)產(chǎn)生微小的泄漏電流。實(shí)際記錄時(shí)應(yīng)充分考慮空載泄漏電流的大小，對(duì)實(shí)測(cè)數(shù)據(jù)進(jìn)行微小的調(diào)整，以減小誤差，向真值靠近。</span></p> <div id="iqaqewgi6e" class="clear"></div> </div> <div id="iqaqewgi6e" class="article"> <p>上一篇：<a href="/Article-2491277.html">高壓試驗(yàn)變壓器的類型及使用</a></p> <p>下一篇：<a href="/Article-2489854.html">想知道壓接鉗的使用場(chǎng)合及方法么？看看這些吧</a></p> </div> <div id="iqaqewgi6e" class="clear"></div> </div> </div> <div id="iqaqewgi6e" class="n-9"> <div id="iqaqewgi6e" class="c-right"> <div id="iqaqewgi6e" class="c-1 r-pro"> <div id="iqaqewgi6e" class="c-left"> <div id="iqaqewgi6e" class="h-2"><a href="/products.html">產(chǎn)品分類</a></div> <ul> <li><a href="/ParentList-1388067.html" onmouseover="showsubmenu('大電流發(fā)生器')" class="yj">大電流發(fā)生器</a> <div 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