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href="http://www.cdcfah.com/cp/third-csjhsb_dhjhj/">電話交換機</a>?通化優(yōu)良電話交換機南京德世偉業(yè)軟件技術供應</p><div id="v57nvjx" class="leftbox clearfix"><h1>通化優(yōu)良電話交換機南京德世偉業(yè)軟件技術供應</h1><div id="jfvtjp7" class="proBig"><div id="drhfvjh" 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="dbrh9jh" 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="brh7ln9" 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(chǎn)品關鍵詞：</span>通化優(yōu)良電話交換機</p><p><span>***更新：</span>2020-06-26 19:17:33</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="hhnllbz" 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(wǎng)址: </span></p><p><span>手機: </span>025-84728227</p><p><span>地址: </span>經(jīng)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="ddthxdr" class="page-proshow02"><p class="title">詳細說明</p><div id="z9pv7hf" 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，通化優(yōu)良電話交換機，當超過居里點溫度后，電阻增加，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，又起到開關作用．利用這種阻溫特性做成加熱源，通化優(yōu)良電話交換機，作為加熱元件應用的有暖風器、電烙鐵、烘衣柜、空調(diào)等，通化優(yōu)良電話交換機，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(chǎn)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(chǎn)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(chǎn)設計的時候已經(jīng)***采用。上述兩道防護措施防護普通的過流過壓保護已經(jīng)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、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="通化優(yōu)良電話交換機" src="http://tyunfile.71360.com/UpLoadFile/2019/7/17/14/636989706098401482_njdswy_2381943.png"></div><p style="text-indent:25px">氣體放電管陶瓷氣體放電管是在放電間隙內(nèi)充入適當?shù)亩栊詺怏w介質。配以高活性的電子發(fā)射材料及放電引燃機構，通過貴金屬焊料高溫封接而成的一種特殊的金屬陶瓷結構的氣體放電器件。它可用于瞬間過電壓防浪涌，也可用作點火。其高阻抗、低極間電容和高耐沖擊電流是其它放電管所不具備的。當線路有瞬時過電壓竄入時，放電管被擊穿，阻抗迅速下降，幾乎是短路狀態(tài)。放電管將大電流通過線路接地或回路泄放，也將電壓限制在低電位，從而保護了線路及設備。當過電壓浪涌消失后，又迅速的恢復到的高阻狀態(tài)，保證線路的正常工作。氣體放電管的特點是：抗高壓、抗高電流沖擊（75-4000V），但在響應時間上會比低壓防護電路元件要慢，放電時間長、動作靈敏度不夠理想，對于波頭上升陡度較大的雷電波難以有效地抑制。相對放電時間越短、耐壓越高的**其性能會越好當然造價會越高。在電話交換機行業(yè)應用上把氣體放電管類的產(chǎn)品用做配線部分也就是外部的防雷、防高壓措施。也就是我們建議廣大用戶配該類放雷措施的主要組成器件，銜接于電話交換機與線路之間。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="通化優(yōu)良電話交換機" 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(nèi)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(jīng)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(chǎn)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></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/402552.html</p></div></div></div></div></div><div id="pnlrznd" class="page-right twoColRt"><div id="lbz7db9" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="7rnl7nl" class="recomPic likePro"><a href="http://www.cdcfah.com/cp/814588.html"><div><img src="http://tyunfile.71360.com/UpLoadFile/2019/11/1/14/637082168864691056_lgpj_5374157.jpg" alt="福建ZF配件哪家強信息推薦自業(yè)物資供應" class="vcenter" 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