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高頻變壓器檢測需要具備什么條??</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(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)表時間??013-10-15 14:57:00</span>
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<p> <strong><a href="http://www.linhang.com.cn/product/product-0001,0015.shtml">高頻變壓??/a></strong>是經(jīng)過多道工序制作而成??但是由于它應(yīng)用的都是一些比較重要的地方,若是出現(xiàn)的問??造成的后果通常都是非常嚴(yán)重??因此,高頻變壓器在制作完成之后,需要對其進行檢??下面是高頻變壓器測試所需具備的條件：</p>
<p> 一、電阻法則測量線圈的平均溫升</p>
<p> 電阻法測量線圈平均溫升的原理是利用導(dǎo)線電阻隨溫度成正比增加的性質(zhì)??/p>
<p> 電阻法測量線圈平均溫升的步驟如下??/p>
<p> 一.冷阻測量</p>
<p> 測量在環(huán)境溫度為t1時的冷阻r1。測量時，應(yīng)在溫度比較穩(wěn)定的環(huán)境下進行（例如置入不通電的烘箱內(nèi)，溫度就不易受周圍環(huán)境溫度變化的影響）。此時，每隔一定時間（如半小時）測一次冷阻，至電阻充分穩(wěn)定后讀數(shù)??/p>
<p> ??負荷:負荷??0.6.1節(jié)要求進行??/p>
<p> ??斷電測量</p>
<p> 當(dāng)變壓器負荷到規(guī)定時間后，先測量變壓器各繞組的負載電壓，然后斷電測量直流電阻。測量應(yīng)在環(huán)境溫度比較穩(wěn)定時進行，斷電后立即用電橋測量線圈的熱阻r2，或盡快測得4~5點熱阻，并記錄從斷電到數(shù)據(jù)時間，然后用外推法求出斷電瞬間的熱阻r2??/p>
<p> ??計算:計算線圈平均溫升</p>
<p> ??注意事項</p>
<p> 1．試驗環(huán)境。被試變壓器的應(yīng)用螺栓架??0mm，測量環(huán)境溫度的溫度計應(yīng)放在距線圈表??00mm~300mm處，試樣應(yīng)避免直接受到風(fēng)吹以及其他發(fā)熱體如火爐、暖氣、負載電阻等的熱輻射??/p>
<p> 2??所使用的電阻電橋應(yīng)有足夠的靈敏度，當(dāng)變壓器線圈電阻小于1歐時，應(yīng)采用凱爾文電橋。同時，測量電阻時的引線電阻與試樣冷阻相比應(yīng)不大??%??/p>
<p> 3．當(dāng)被試變壓器有幾個繞組時，應(yīng)測量線圈內(nèi)部繞組的溫升，也就是說，應(yīng)在接近線圈1/3厚度處的繞組上測量，因為這一繞組的平均溫升最高??/p>
<p> 4．當(dāng)不用外推法時，熱阻測量應(yīng)??0s左右完成。此外，t2與t1之溫差最好不要超??℃??/p>
<p> 5??變壓器溫升達到穩(wěn)定所需的時間與變壓器質(zhì)量有關(guān)。一般認(rèn)為在經(jīng)過4~5T的時間后變壓器溫升即達穩(wěn)定。其中T為變壓器發(fā)熱及冷卻時間常數(shù)??/p>
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