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class="info_con_tit"> <div id="6aplaizydtj" class="n_tit"> <span>文章出處??a href=""><a >深圳市晨飛電子有限公??/a></a></span><span>網(wǎng)責(zé)任編輯：<a >NSW</a></span><span>作者：<a >NSW</a></span><span>人氣??span id="cntrHits">-</span></span><span>發(fā)表時(shí)間??014-12-08 14:09:00</span> <div id="6aplaizydtj" class="newchang">  <div class="6aplaizydtj" id="ckepop"> <a class="jiathis jiathis_txt jtico jtico_jiathis" target="_blank">分享到：</a> <a class="jiathis_button_qzone">QQ空間</a> <a class="jiathis_button_tsina"> 新浪微博</a> <a class="jiathis_button_tqq">騰訊微博</a> <a class="jiathis_button_tsohu">搜狐微博</a> <a class="jiathis_button_t163">網(wǎng)易微博</a> <a class="jiathis_button_tools_1"></a><a class="jiathis_button_tools_2"></a> </div> <script type="text/javascript"> var jiathis_config = { "data_track_clickback": true };</script> <script type="text/javascript" src="http://v2.jiathis.com/code/jia.js?uid=899792" charset="utf-8"></script>  </div> </div> </div> </div> <div class="6aplaizydtj" id="cntrBody"> <p>　　<span style="font-size: 14px">一)斷線可能引起諧振過(guò)電??/span></p> <p> </p> <p><span style="font-size: 14px">　　導(dǎo)線的開斷、開關(guān)不同期切合和熔斷器不同期熔斷將引起鐵磁諧振過(guò)電壓。由斷線引起的諧振過(guò)電壓可能導(dǎo)致避雷器爆炸，負(fù)載變壓器的相序反傾和電氣設(shè)備絕緣閃絡(luò)等現(xiàn)象??/span></p> <p> </p> <p><span style="font-size: 14px">　　??電磁式電壓互感器的諧振過(guò)電壓</span></p> <p> </p> <p><span style="font-size: 14px">　　由于電網(wǎng)參數(shù)不對(duì)稱，呈現(xiàn)中性點(diǎn)位移，常會(huì)引起鐵磁諧振過(guò)電壓，使電磁式電壓互感器的高壓安全絲頻繁熔斷，或造成互感器自身的燒毀。限制和消除鐵磁諧振過(guò)電壓的措施??/span></p> <p> </p> <p><span style="font-size: 14px">　　1、選用勵(lì)磁特性較好的電壓互感器或改用電容式互感器??/span></p> <p> </p> <p><span style="font-size: 14px">　　2、電磁式電壓互感器的開口三角形繞組中加裝阻尼電阻，可消除各種諧振現(xiàn)象??/span></p> <p> </p> <p><span style="font-size: 14px">　　3、母線上加裝一定的對(duì)地電容，使XC0≤0.01XT諧板就不能發(fā)生??/span></p> <p> </p> <p><span style="font-size: 14px">　　4、采用臨時(shí)的倒閘措施，如投入消弧線圈，將變壓器中性點(diǎn)臨時(shí)接地以及投入事先規(guī)定的些某線路或設(shè)備等??/span></p> <p> </p> <p><span style="font-size: 14px">　　??絕緣水平要求??/span></p> <p> </p> <p><span style="font-size: 14px">　　單相接地時(shí)，非故障相對(duì)地電壓升高√3倍。所以，這種電網(wǎng)中的設(shè)備絕緣水平高和費(fèi)用大??/span></p> <p> </p> <p><span style="font-size: 14px">　　??存在弧光接地過(guò)電壓的危險(xiǎn)</span></p> <p> </p> <p><span style="font-size: 14px">　　單相接地電流不大時(shí)，電流流過(guò)零值時(shí)的電弧將自行熄滅，故障消??單相接地電流大于30安時(shí)，發(fā)生穩(wěn)定電弧，將形成繼續(xù)性弧光接地，將會(huì)損壞設(shè)備并導(dǎo)致兩相甚至三相短??當(dāng)接地電流大??0安小??0安時(shí)，有可能發(fā)生一種不穩(wěn)定的間歇性電弧，隨之將呈現(xiàn)弧光過(guò)電壓，幅值可??.5??倍相電壓，足以危及整個(gè)電網(wǎng)的絕緣。變壓器的中性點(diǎn)裝設(shè)消弧線圈形成的電感電流與電容電流相補(bǔ)償，將使接地電流限止，甚至近于零，從而消除了接地處的電弧以及由它發(fā)生和危害??/span></p> <p> </p> <p><span style="font-size: 14px">　　??接地繼電保護(hù)的選擇困難</span></p> <p> </p> <p><span style="font-size: 14px">　　因而要實(shí)現(xiàn)靈敏的有選擇性的維護(hù)就比較困難，特別是經(jīng)消弧線圈接地的電力網(wǎng)更困難??/span></p> <p> </p> <p><span style="font-size: 14px">　　二??/span><strong><a href="http://linhang.com.cn/Products/gongmoxianquan.html"><span style="font-size: 14px">高頻變壓??/span></a></strong><span style="font-size: 14px">中性點(diǎn)不接地運(yùn)行的優(yōu)點(diǎn)</span></p> <p> </p> <p><span style="font-size: 14px">　　一)供電可靠性較??/span></p> <p> </p> <p><span style="font-size: 14px">　　當(dāng)電網(wǎng)發(fā)生單相接地故障時(shí)，三相線電壓和相電流變化甚小。由于不構(gòu)成短路回路，單相接地電流對(duì)用戶供電影響不大。但是必需在較短時(shí)??一??小時(shí))內(nèi)迅速清除故障，以免故障擴(kuò)大。由于短時(shí)間內(nèi)不致跳閘，供電可靠性較高??/span></p> <p> </p> <p><span style="font-size: 14px">　　??對(duì)通信和信號(hào)系統(tǒng)的干擾??/span></p> <p> </p> <p><span style="font-size: 14px">　　當(dāng)三相基本對(duì)稱運(yùn)行時(shí)，電力線對(duì)周圍空間形成的電磁場(chǎng)不大，不會(huì)對(duì)通訊和信號(hào)系統(tǒng)發(fā)生干擾影響。同理，由于變壓器中性點(diǎn)不接地的電路單相接地電流較小，對(duì)鄰近的通訊線路和信號(hào)系統(tǒng)等弱電干擾也較小??/span></p> </div> <div id="6aplaizydtj" class="apage" id="showfenye">  <script type="text/javascript"> var pagecont=1; if(pagecont > 2) { var ss = new Cls_jsPage(1, 1, 5, "ss"); ss.setPageSE("gaopinbianyaqizhongx_", ".html"); ss.setPageInput("Page"); ss.setUrl(""); ss.setPageFrist("<a disabled='true'class='ob'>首頁(yè)</a>", "首頁(yè)"); ss.setPagePrev("<a 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