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class="bigimg"><div><p class="pic"><img src="http://tyunfile.71360.com/UpLoadFile/2019/7/17/14/636989706098401482_njdswy_2381943.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="cig2m42" class="smallimg"><div><p class="pic"><img src="http://tyunfile.71360.com/UpLoadFile/2019/7/17/14/636989706098401482_njdswy_2381943.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="o2ua2em" class="content"><p><span>需求數(shù)量：</span>0</p><p><span>價格要求：</span>面議</p><p><span>所在地：</span>江蘇省</p><p><span>包裝要求：</span><span style="color: #f30;"></span></p><p><span>產品關鍵詞：</span>廣安電話交換機維修</p><p><span>***更新：</span>2020-06-24 21:20:32</p><p><span id="click" >瀏覽次數(shù)：0次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="g4ymsou" class="rightbox"><h3>公司基本資料信息</h3><p style="border:0;"><a rel="nofollow">南京德世偉業(yè)軟件技術有限公司</a></p><p><span>聯(lián)系人：</span>李永亮</p><p><span>郵箱: </span>634765682@qq.com</p><p><span>電話: </span>13276689930</p><p><span>傳真: </span>025_84728227</p><p><span>網址: </span></p><p><span>手機: </span>025-84728227</p><p><span>地址: </span>經濟開發(fā)區(qū)恒盛路5號4號樓215-D室</p><p>[當前離線] <a rel="nofollow"> [加為商友] </a><a rel="nofollow"> [發(fā)送信件] </a></p></div></div><div id="g2o2ayy" class="page-proshow02"><p class="title">詳細說明</p><div id="esges2y" class="box"><p><p style="text-indent:25px">熱敏電阻熱敏電阻可用作加熱元件外，同時還能起到“開關”的作用，兼有敏感元件、加熱器和開關三種功能，稱之為“熱敏開關”．電流通過元件后引起溫度升高，即發(fā)熱體的溫度上升，當超過居里點溫度后，電阻增加，廣安電話交換機維修，從而限制電流增加，于是電流的下降增加元件溫度降低，電阻值的減小又使電路電流增加，元件溫度升高，周而復始，因此具有使溫度保持在特定范圍的功能，廣安電話交換機維修，又起到開關作用．利用這種阻溫特性做成加熱源，作為加熱元件應用的有暖風器、電烙鐵、烘衣柜、空調等，還可對電器起到過熱保護作用． NTC熱敏電阻器是一種負溫度系數(shù)熱敏電阻器，該產品的電阻值隨溫度升高而降低，根據(jù)其作用封裝成各種形狀以及具有不同的技術指標。該產品主要用于溫度補償、溫度測量和在各類電源中吸收浪涌電流作為線路保護元件。同樣與壓敏電阻類似，熱敏電阻同樣在集團電話交換機生產設計的時候已經***采用。上述兩道防護措施防護普通的過流過壓保護已經足夠了，但*靠它門來對付高達上萬V的雷電時它們就力不從心了，瞬間會被擊穿，廣安電話交換機維修、損壞。壓敏電阻和熱敏電阻共同的特點是：反映速度快能盡量避免高壓通過的瞬間損害設備，抗壓系數(shù)低，都是在低電壓的工作狀態(tài)。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="廣安電話交換機維修" src="http://tyunfile.71360.com/UpLoadFile/2019/7/17/14/636989706098401482_njdswy_2381943.png"></div><p style="text-indent:25px">電話交換機常見防雷（過流、過壓）保護器件及其應用特性壓敏電阻：壓敏電阻是在一定電流電壓范圍內電阻值隨電壓而變的電阻，壓敏電阻器的電阻體材料是半導體，所以它是半導體電阻器的一個品種?，F(xiàn)在大量使用的是"氧化鋅"（ZnO）壓敏電阻器。壓敏電阻有什么用？壓敏電阻的比較大特點是當加在它上面的電壓低于它的閥值"UN"時，流過它的電流極小，相當于一只關死的閥門，當電壓超過UN時，流過它的電流激增，相當于閥門打開。利用這一功能，可以抑制電路中經常出現(xiàn)的異常過電壓，保護電路免受過電壓的損害。其特點是：反映速度快、耐高壓系數(shù)底，適用于元件級別的保護、靜電保護、浪涌保護。現(xiàn)在我們現(xiàn)在電話交換機設計生產的時候基本都使用了氧化鋅壓敏電阻，這里使用的壓敏電阻的閥值電壓約為270V，當電壓小于270V時（正常值為220V）它相當于不導通，而當電源異常，短時超過270V時，它就導通，形成短路，將電壓限制在270V。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="廣安電話交換機維修" src="http://tyunfile.71360.com/UpLoadFile/2019/7/17/14/636989706097149850_njdswy_3649872.png"></div><p style="text-indent:25px">電話交換機內部采用壓敏電阻+熱敏電阻+外部氣體放電管構建成三級防雷措施，當然也有更高級別的防護措施的如：高精斷的昂貴儀器采用四級、五級的防護措施，但由于其造價也非常昂貴用做電話交換機行業(yè)顯然不太現(xiàn)實。雷電很強大，有時候大的你無法想象，任何一種措施都無法**完全避免雷電的損害。對于集團電話交換機設備來說有高于5V的電壓就有損壞設備的可能，所以一般的防雷措施都是盡量的去避免雷電的損壞、減少損壞的程度。根據(jù)我們的經驗：完全沒有防護措施的設備在遭遇中、輕度雷電的損壞的情況損壞程度會達到70%以上，擁有內部元件級防護（壓/熱敏元件）損失程度在50-20%之間，采用質量好的三級防護損失程度會在20%--0% 輕微損壞或完全防護。各級放護元件根據(jù)其特性、標準值會有一個極限值當遭遇強電超出其可耐受范圍時就會出現(xiàn)“魚死網破”的局面…..防護元件在消耗一部分能量之后會被擊傳！損壞、甚至炸裂…這種現(xiàn)象會導致防護元件無法重復使用必須更換，但相對于減輕對設備價值角度來講這點損失是完全有必要的。所以即使有相關的防護措施的用戶應當在雷雨過后或每年雷雨季節(jié)到來之前檢查是否完好。</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/379229.html</p></div></div></div></div></div><div id="iocaguk" class="page-right twoColRt"><div id="qgecigm" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="wm2wusa" class="recomPic 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