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開關電源變壓器的壽命和絕緣溫度</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(wǎng)責任編輯：<a >NSW</a></span><span>作者：<a >NSW</a></span><span>人氣??span
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<p> <span style="font-size: 16px">怎樣才能稱之為開關電源變壓器的壽??絕緣溫度指的又是什??</span></p>
<p> </p>
<p><span style="font-size: 16px"> </span><strong><a href="http://linhang.com.cn/product/"><span style="font-size: 16px">開關電源變壓器</span></a></strong><span style="font-size: 16px">在額定電壓和額定負載下正常運行的時間，稱為變壓器的使用壽命。制造變壓器的材料主要包括金屬材料和絕緣材料兩大類。若變壓器的運行溫度長時間超過允許值，則變壓器的絕緣材料容易損壞。因為絕緣材料長期受熱老化，溫度越高絕緣材料老化越快。當絕緣材料老化到一定程度時，在運行震動和電動力的作用下，造成絕緣材料破裂，易發(fā)生電氣擊穿的故障，導致變壓器使用壽命減少，所以溫度是影響變壓器使用壽命的主要因素之一。變壓器的壽命在一定意義上可以說就是絕緣材料的壽命??/span></p>
<p> </p>
<p><span style="font-size: 16px"> 1. 正確調(diào)整變壓器負荷，使變壓器達到理想的使用年限：</span></p>
<p> </p>
<p><span style="font-size: 16px"> 變壓器內(nèi)部的絕緣溫度在電壓基本一定的前提下，主要與負荷電流大小有關，即負荷電流大，絕緣溫度則高，反之負荷電流小絕緣溫度低??/span></p>
<p> </p>
<p><span style="font-size: 16px"> 變壓器在運行中過負荷或夏季帶額定負荷運行時，內(nèi)部絕緣處在高溫下運行，變壓器的壽命損失將加快。若變壓器處于輕負荷或冬季帶額定負荷運行時，其內(nèi)部絕緣在低溫下運行，變壓器壽命損失則可減緩。因此為了使變壓器負荷能力在全年得到充分利用又不影響變壓器正常使用壽命，每個月負荷可適當調(diào)整??/span></p>
<p> </p>
<p><span style="font-size: 16px"> 2. 變壓器使用壽命與絕緣溫度的關系：</span></p>
<p> </p>
<p><span style="font-size: 16px"> 我國電力變壓器，大部分采用油紙絕緣即A級絕緣。對于A級絕緣的變壓器，在正常運行中，當周圍空氣溫度??0℃時，變壓器繞組的極限工作溫度為105℃??/span></p>
<p><span style="font-size: 16px"> 實踐和研究表明，如果繞組能連續(xù)維??5℃溫度，可以保證變壓器具??0年的使用壽命。根據(jù)溫度與壽命的關系，還可引出一個所??℃定則：以上述溫度下的壽命為基礎，繞組溫度每升高8℃，變壓器使用壽命就縮短1/2??/span></p>
<p> </p>
<p><span style="font-size: 16px"> 據(jù)有關資料和實踐證明??/span></p>
<p> </p>
<p><span style="font-size: 16px"> 變壓器絕緣工作溫度在95℃時，變壓器使用壽命??0年??/span></p>
<p> </p>
<p><span style="font-size: 16px"> 變壓器絕緣工作溫度在105℃，變壓器使用壽命為7年??/span></p>
<p> </p>
<p><span style="font-size: 16px"> 變壓器絕緣工作溫度在120℃時，變壓器使用壽命??年??/span></p>
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