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class="wrap clearfix"><section class="container clearfix tcPro"><section class="home-main container clearfix"><div id="rlyvnh2" class="twoCol"><div id="23kmeyp" class="page-proshow clearfix"><p class="current"> 當(dāng)前位置:<a href="http://www.cdcfah.com/">首頁(yè)?<a href="http://www.cdcfah.com/cp/">產(chǎn)品供應(yīng)</a>?<a href="http://www.cdcfah.com/cp/first-_txcp/">通信產(chǎn)品</a>?<a href="http://www.cdcfah.com/cp/second-txcp_csjhsb/">傳輸、交換設(shè)備</a>?<a href="http://www.cdcfah.com/cp/third-csjhsb_dhjhj/">電話交換機(jī)</a>?泰州質(zhì)量電話交換機(jī) 南京德世偉業(yè)軟件技術(shù)供應(yīng)</p><div id="vkmoq8l" class="leftbox clearfix"><h1>泰州質(zhì)量電話交換機(jī) 南京德世偉業(yè)軟件技術(shù)供應(yīng)</h1><div id="bv82jln" class="proBig"><div id="et8ryxt" class="bigimg"><div><p class="pic"><img src="http://tyunfile.71360.com/UpLoadFile/2019/7/17/14/636989706097149850_njdswy_3649872.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="kzrt7uw" class="smallimg"><div><p class="pic"><img src="http://tyunfile.71360.com/UpLoadFile/2019/7/17/14/636989706097149850_njdswy_3649872.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="pzw2cjq" class="content"><p><span>需求數(shù)量：</span>0</p><p><span>價(jià)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(guān)鍵詞：</span>泰州質(zhì)量電話交換機(jī)</p><p><span>***更新：</span>2020-06-08 07:05:14</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="rby2zry" 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(shù)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(jī): </span>025-84728227</p><p><span>地址: </span>經(jīng)濟(jì)開發(fā)區(qū)恒盛路5號(hào)4號(hào)樓215-D室</p><p>[當(dāng)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="ydaxjvm" class="page-proshow02"><p class="title">詳細(xì)說(shuō)明</p><div id="ynprtah" class="box"><p><p style="text-indent:25px">電話交換機(jī)內(nèi)部采用壓敏電阻+熱敏電阻+外部氣體放電管構(gòu)建成三級(jí)防雷措施，當(dāng)然也有更高級(jí)別的防護(hù)措施的如：高精斷的昂貴儀器采用四級(jí)、五級(jí)的防護(hù)措施，但由于其造價(jià)也非常昂貴用做電話交換機(jī)行業(yè)顯然不太現(xiàn)實(shí)。雷電很強(qiáng)大，有時(shí)候大的你無(wú)法想象，任何一種措施都無(wú)法**完全避免雷電的損害。對(duì)于集團(tuán)電話交換機(jī)設(shè)備來(lái)說(shuō)有高于5V的電壓就有損壞設(shè)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(jīng)驗(yàn)：完全沒有防護(hù)措施的設(shè)備在遭遇中、輕度雷電的損壞的情況損壞程度會(huì)達(dá)到70%以上，擁有內(nèi)部元件級(jí)防護(hù)（壓/熱敏元件）損失程度在50-20%之間，采用質(zhì)量好的三級(jí)防護(hù)損失程度會(huì)在20%--0% 輕微損壞或完全防護(hù)。各級(jí)放護(hù)元件根據(jù)其特性、標(biāo)準(zhǔn)值會(huì)有一個(gè)極限值當(dāng)遭遇強(qiáng)電超出其可耐受范圍時(shí) 就會(huì)出現(xiàn)“魚死網(wǎng)破”的局面…，泰州質(zhì)量電話交換機(jī)..防護(hù)元件在消耗一部分能量之后會(huì)被擊傳，泰州質(zhì)量電話交換機(jī)！損壞、甚至炸裂…這種現(xiàn)象會(huì)導(dǎo)致防護(hù)元件無(wú)法重復(fù)使用必須更換，泰州質(zhì)量電話交換機(jī)，但相對(duì)于減輕對(duì)設(shè)備價(jià)值角度來(lái)講這點(diǎn)損失是完全有必要的。所以即使有相關(guān)的防護(hù)措施的用戶應(yīng)當(dāng)在雷雨過(guò)后或每年雷雨季節(jié)到來(lái)之前檢查是否完好。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="泰州質(zhì)量電話交換機(jī)" 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(jī)常見防雷（過(guò)流、過(guò)壓）保護(hù)器件及其應(yīng)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(dǎo)體，所以它是半導(dǎo)體電阻器的一個(gè)品種。現(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(diǎn)是當(dāng)加在它上面的電壓低于它的閥值"UN"時(shí)，流過(guò)它的電流極小，相當(dāng)于一只關(guān)死的閥門，當(dāng)電壓超過(guò)UN時(shí)，流過(guò)它的電流激增，相當(dāng)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(guò)電壓，保護(hù)電路免受過(guò)電壓的損害。其特點(diǎn)是：反映速度快、耐高壓系數(shù)底，適用于元件級(jí)別的保護(hù)、靜電保護(hù)、浪涌保護(hù)。現(xiàn)在我們現(xiàn)在電話交換機(jī)設(shè)計(jì)生產(chǎn)的時(shí)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(dāng)電壓小于270V時(shí)（正常值為220V）它相當(dāng)于不導(dǎo)通，而當(dāng)電源異常，短時(shí)超過(guò)270V時(shí)，它就導(dǎo)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="泰州質(zhì)量電話交換機(jī)" src="http://tyunfile.71360.com/UpLoadFile/2019/7/17/14/636989706098401482_njdswy_2381943.png"></div></p><br /><p>文章來(lái)源地址: http://www.cdcfah.com/cp/186789.html</p></div></div></div></div></div><div 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