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開關(guān)電源變壓器的檢測方??/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(shí)間??014-04-18 14:14:00</span>
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<p> <span style="font-size: 16px"> 1、電源變壓器短路性故障的綜合檢測判別??/span><strong><a href="http://linhang.com.cn/product/"><span style="font-size: 16px">開關(guān)電源變壓器</span></a></strong><span style="font-size: 16px">發(fā)生短路性故障后的主要癥狀是發(fā)熱嚴(yán)重和次級繞組輸出電壓失常。通常，線圈內(nèi)部匝間短路點(diǎn)越多，短路電流就越大，而變壓器發(fā)熱就越嚴(yán)重。檢測判斷電源變壓器是否有短路性故障的簡單方法是測量空載電流(測試方法前面已經(jīng)介紹)。存在短路故障的變壓器，其空載電流值將遠(yuǎn)大于滿載電流的10%。當(dāng)短路嚴(yán)重時(shí)，變壓器在空載加電后幾十秒鐘之內(nèi)便會迅速發(fā)熱，用手觸摸鐵心會有燙手的感覺。此時(shí)不用測量空載電流便可斷定變壓器有短路點(diǎn)存在??/span></p>
<p> </p>
<p><span style="font-size: 16px"> 2、絕緣性測試。用萬用表R×10k擋分別測量鐵心與初級，初級與各次級、鐵心與各次級、靜電屏蔽層與衩次級、次級各繞組間的電阻值，萬用表指針均應(yīng)指在無窮大位置不動。否則，說明變壓器絕緣性能不良??/span></p>
<p> </p>
<p><span style="font-size: 16px"> 3、通過觀察變壓器的外貌來檢查其是否有明顯異?，F(xiàn)象。如線圈引線是否斷裂，脫焊，絕緣材料是否有燒焦痕跡，鐵心緊固螺桿是否有松動，硅鋼片有無銹蝕，繞組線圈是否有外露等??/span></p>
<p> </p>
<p><span style="font-size: 16px"> 4、判別初、次級線圈。電源變壓器初級引腳和次級引腳一般都是分別從兩側(cè)引出的，并且初級繞組多標(biāo)??20V字樣，次級繞組則標(biāo)出額定電壓值，??5V??4V??5V等。再根據(jù)這些標(biāo)記進(jìn)行識別??/span></p>
<p> </p>
<p style="text-align: center"><span style="font-size: 16px"><img width="168" height="168" src="/UploadFiles/FCK/123123(4).jpg" alt="" /></span></p>
<p> </p>
<p><span style="font-size: 16px"> 5、線圈通斷的檢測。將萬用表置于R×1擋，測試中，若某個(gè)繞組的電阻值為無窮大，則說明此繞組有斷路性故障??/span></p>
<p> </p>
<p><span style="font-size: 16px"> 6、空載電流的檢測??/span></p>
<p> </p>
<p><span style="font-size: 16px"> a、直接測量法。將次級所有繞組全部開路，把萬用表置于交流電流??500mA，串入初級繞組。當(dāng)初級繞組的插頭插??20V交流市電時(shí)，萬用表所指示的便是空載電流值。此值不應(yīng)大于變壓器滿載電流??0%??0%。一般常見電子設(shè)備電源變壓器的正常空載電流應(yīng)??00mA左右。如果超出太多，則說明變壓器有短路性故障??/span></p>
<p> </p>
<p><span style="font-size: 16px"> b、間接測量法。在變壓器的初級繞組中串聯(lián)一??0?/5W的電阻，次級仍全部空載。把萬用表撥至交流電壓擋。加電后，用兩表筆測出電阻R兩端的電壓降U，然后用歐姆定律算出空載電流I空，即I??U/R。F?空載電壓的檢測。將電源變壓器的初級??20V市電，用萬用表交流電壓接依次測出各繞組的空載電壓??U21、U22、U23、U24)應(yīng)符合要求值，允許誤差范圍一般為：高壓繞??le;±10%，低壓繞??le;±5%，帶中心抽頭的兩組對稱繞組的電壓差應(yīng)≤±2%??/span></p>
<p> </p>
<p><span style="font-size: 16px"> 7、檢測判別各繞組的同名端。在使用電源??/span><span style="font-size: 16px">壓器時(shí)，有時(shí)為了得到所需的次級電壓，可將兩個(gè)或多個(gè)次級繞組串聯(lián)起來使用。采用串聯(lián)法使用電源變壓器時(shí)，參加串聯(lián)的各繞組的同名端必須正確連接，不能搞錯(cuò)。否則，變壓器不能正常工作??/span></p>
<p> </p>
<p><span style="font-size: 16px"> 8、一般小功率電源變壓器允許溫升為40℃～50℃，如果所用絕緣材料質(zhì)量較好，允許溫升還可提高??/span></p>
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