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<h3>
高頻變壓器中性點不接地的優(yōu)缺??/h3>
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<span>文章出處??a href=""><a >深圳市晨飛電子有限公??/a></a></span><span>網責任編輯：<a >NSW</a></span><span>作者：<a >NSW</a></span><span>人氣??span
id="cntrHits">-</span></span><span>發(fā)表時間??014-12-08 14:09:00</span>
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<p> <span style="font-size: 14px">一)斷線可能引起諧振過電??/span></p>
<p> </p>
<p><span style="font-size: 14px"> 導線的開斷、開關不同期切合和熔斷器不同期熔斷將引起鐵磁諧振過電壓。由斷線引起的諧振過電壓可能導致避雷器爆炸，負載變壓器的相序反傾和電氣設備絕緣閃絡等現象??/span></p>
<p> </p>
<p><span style="font-size: 14px"> ??電磁式電壓互感器的諧振過電壓</span></p>
<p> </p>
<p><span style="font-size: 14px"> 由于電網參數不對稱，呈現中性點位移，常會引起鐵磁諧振過電壓，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電壓的措施??/span></p>
<p> </p>
<p><span style="font-size: 14px"> 1、選用勵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，可消除各種諧振現象??/span></p>
<p> </p>
<p><span style="font-size: 14px"> 3、母線上加裝一定的對地電容，使XC0≤0.01XT諧板就不能發(fā)生??/span></p>
<p> </p>
<p><span style="font-size: 14px"> 4、采用臨時的倒閘措施，如投入消弧線圈，將變壓器中性點臨時接地以及投入事先規(guī)定的些某線路或設備等??/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，非故障相對地電壓升高√3倍。所以，這種電網中的設備絕緣水平高和費用大??/span></p>
<p> </p>
<p><span style="font-size: 14px"> ??存在弧光接地過電壓的危險</span></p>
<p> </p>
<p><span style="font-size: 14px"> 單相接地電流不大時，電流流過零值時的電弧將自行熄滅，故障消??單相接地電流大于30安時，發(fā)生穩(wěn)定電弧，將形成繼續(xù)性弧光接地，將會損壞設備并導致兩相甚至三相短??當接地電流大??0安小??0安時，有可能發(fā)生一種不穩(wěn)定的間歇性電弧，隨之將呈現弧光過電壓，幅值可??.5??倍相電壓，足以危及整個電網的絕緣。變壓器的中性點裝設消弧線圈形成的電感電流與電容電流相補償，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"> ??接地繼電保護的選擇困難</span></p>
<p> </p>
<p><span style="font-size: 14px"> 因而要實現靈敏的有選擇性的維護就比較困難，特別是經消弧線圈接地的電力網更困難??/span></p>
<p> </p>
<p><span style="font-size: 14px"> 二??/span><strong><a href="http://m.linhang.com.cn/Products/gongmoxianquan.html"><span style="font-size: 14px">高頻變壓??/span></a></strong><span style="font-size: 14px">中性點不接地運行的優(yōu)點</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"> 當電網發(fā)生單相接地故障時，三相線電壓和相電流變化甚小。由于不構成短路回路，單相接地電流對用戶供電影響不大。但是必需在較短時??一??小時)內迅速清除故障，以免故障擴大。由于短時間內不致跳閘，供電可靠性較高??/span></p>
<p> </p>
<p><span style="font-size: 14px"> ??對通信和信號系統的干擾??/span></p>
<p> </p>
<p><span style="font-size: 14px"> 當三相基本對稱運行時，電力線對周圍空間形成的電磁場不大，不會對通訊和信號系統發(fā)生干擾影響。同理，由于變壓器中性點不接地的電路單相接地電流較小，對鄰近的通訊線路和信號系統等弱電干擾也較小??/span></p>
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