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開(kāi)關(guān)電源變壓器質(zhì)量好壞的常見(jiàn)檢查項(xiàng)??/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
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<p><a href="http://m.cmqp.com.cn/"><strong>開(kāi)關(guān)電源變壓器</strong></a>是加入了開(kāi)關(guān)管的電源變壓器，在電路中除了普通變壓器的電壓變換功能，還兼具絕緣隔離與功率傳送功能一般用在開(kāi)關(guān)電源等涉及高頻電路的場(chǎng)合。開(kāi)關(guān)電源質(zhì)量好壞的檢查項(xiàng)目包括變壓器的絕緣性測(cè)試，檢查變壓器繞組的同名端，檢測(cè)空載電流，短路性故障的檢測(cè)，線圈通斷，初次級(jí)線圈的檢測(cè)等項(xiàng)目，對(duì)這些項(xiàng)目應(yīng)該如何進(jìn)行檢測(cè)呢？下面請(qǐng)看具體的分析??br />
<br />
開(kāi)關(guān)電源變壓器絕緣性測(cè)試??br />
用萬(wàn)用表R×10k擋分別測(cè)量鐵心與初級(jí)，初級(jí)與各次級(jí)、鐵心與各次級(jí)、靜電屏蔽層與衩次級(jí)、次級(jí)各繞組間的電阻值，萬(wàn)用表指針均應(yīng)指在無(wú)窮大位置不動(dòng)。否則，說(shuō)明變壓器絕緣性能不良??br />
<br />
檢測(cè)判別各繞組的同名端??br />
在使用電源變壓器時(shí)，有時(shí)為了得到所需的次級(jí)電壓，可將兩個(gè)或多個(gè)次級(jí)繞組串聯(lián)起來(lái)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??br />
<br />
空載電流的檢測(cè)??br />
a、直接測(cè)量法。將次級(jí)所有繞組全部開(kāi)路，把萬(wàn)用表置于交流電流??500mA，串入初級(jí)繞組。當(dāng)初級(jí)繞組的插頭插??20V交流市電時(shí)，萬(wàn)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(jiàn)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(shuō)明變壓器有短路性故障??br />
<br />
b、間接測(cè)量法。在變壓器的初級(jí)繞組中串聯(lián)一??0?/5W的電阻，次級(jí)仍全部空載。把萬(wàn)用表?yè)苤两涣麟妷簱??br />
加電后，用兩表筆測(cè)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(cè)。將電源變壓器的初級(jí)??20V市電，用萬(wàn)用表交流電壓接依次測(cè)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(duì)稱(chēng)繞組的電壓差應(yīng)≤±2%??br />
<br />
電源變壓器短路性故障的綜合檢測(cè)判別??br />
電源變壓器發(fā)生短路性故障后的主要癥狀是發(fā)熱嚴(yán)重和次級(jí)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??br />
<br />
檢測(cè)判斷電源變壓器是否有短路性故障的簡(jiǎn)單方法是測(cè)量空載電流(測(cè)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(huì)迅速發(fā)熱，用手觸摸鐵心會(huì)有燙手的感覺(jué)。此時(shí)不用測(cè)量空載電流便可斷定變壓器有短路點(diǎn)存在??br />
<br />
線圈通斷的檢測(cè)??br />
將萬(wàn)用表置于R×1擋，測(cè)試中，若某個(gè)繞組的電阻值為無(wú)窮大，則說(shuō)明此繞組有斷路性故障??br />
<br />
判別初、次級(jí)線圈??br />
電源變壓器初級(jí)引腳和次級(jí)引腳一般都是分別從兩側(cè)引出的，并且初級(jí)繞組多標(biāo)??20V字樣，次級(jí)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(shí)別??br />
<br />
以上就是為大家介紹的有關(guān)開(kāi)關(guān)電源變壓器質(zhì)量好壞的常見(jiàn)檢查項(xiàng)目的介紹，希望可以幫到大家，如果還想了解更多的有關(guān)開(kāi)關(guān)電源變壓器的內(nèi)容，可以點(diǎn)擊<a href="http://m.cmqp.com.cn/news/">開(kāi)關(guān)電源變壓器資訊</a>??/p>
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