福建電話交換機(jī)維修南京德世偉業(yè)軟件技術(shù)供應(yīng)-b2b網(wǎng)站_b2b電子商務(wù)平臺【買產(chǎn)品】-上?？谄蚴称酚邢薰?/title><meta name="description" content="熱敏電阻熱敏電阻可用作加熱元件外，同時(shí)還能起到“開關(guān)”的作用，兼有敏感元件、加熱器和開關(guān)三種功能，稱之為“熱敏開關(guān)”．電流通過元件后引起溫度升高，即發(fā)熱體的溫度上升，當(dāng)超過居里點(diǎn)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"><meta name="keywords" content="福建電話交換機(jī)維修"><link rel="canonical" href="http://www.cdcfah.com/"/><meta name="applicable-device" content="pc"><link rel="shortcut icon" href="/static/new_net_01/images/favicon.ico"><link rel="stylesheet" href="/static/new_net_01/css/slick.css" /><link rel="stylesheet" href="/static/new_net_01/css/addnew.css"><link rel="stylesheet" href="/static/new_net_01/css/sidenav.css"><link rel="stylesheet" href="/static/new_net_01/css/style.css" /><link rel="stylesheet" href="/static/new_net_01/css/tab.css"><link rel="stylesheet" href="/static/new_net_01/css/404.css"> <meta name="baidu-site-verification" content="OBVzrC9aaQ" /> <meta http-equiv="Cache-Control" 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href="http://www.cdcfah.com/cp/third-csjhsb_dhjhj/">電話交換機(jī)</a>?福建電話交換機(jī)維修南京德世偉業(yè)軟件技術(shù)供應(yīng)</p><div id="xgyvxeq" class="leftbox clearfix"><h1>福建電話交換機(jī)維修南京德世偉業(yè)軟件技術(shù)供應(yīng)</h1><div id="jyaszas" class="proBig"><div id="d8ntu77" 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="n3s22ne" 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="w78g3rt" 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>福建電話交換機(jī)維修</p><p><span>***更新：</span>2020-06-20 07:18:30</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="pzbspro" 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4號樓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="cghz3w8" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="raceldk" 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(shí)還能起到“開關(guān)”的作用，兼有敏感元件、加熱器和開關(guān)三種功能，稱之為“熱敏開關(guān)”．電流通過元件后引起溫度升高，即發(fā)熱體的溫度上升，當(dāng)超過居里點(diǎn)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(fù)始，因此具有使溫度保持在特定范圍的功能，又起到開關(guān)作用．利用這種阻溫特性做成加熱源，作為加熱元件應(yīng)用的有暖風(fēng)器、電烙鐵、烘衣柜、空調(diào)等，還可對電器起到過熱保護(hù)作用． NTC熱敏電阻器是一種負(fù)溫度系數(shù)熱敏電阻器，福建電話交換機(jī)維修，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(shù)指標(biāo)。該產(chǎn)品主要用于溫度補(bǔ)償、溫度測量和在各類電源中吸收浪涌電流作為線路保護(hù)元件，福建電話交換機(jī)維修。同樣與壓敏電阻類似，熱敏電阻同樣在集團(tuán)電話交換機(jī)生產(chǎn)設(shè)計(jì)的時(shí)候已經(jīng)***采用。上述兩道防護(hù)措施防護(hù)普通的過流過壓保護(hù)已經(jīng)足夠了，但*靠它門來對付高達(dá)上萬V的雷電時(shí)它們就力不從心了，瞬間會被擊穿、損壞，福建電話交換機(jī)維修。壓敏電阻和熱敏電阻共同的特點(diǎn)是：反映速度快能盡量避免高壓通過的瞬間損害設(shè)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="福建電話交換機(jī)維修" src="http://tyunfile.71360.com/UpLoadFile/2019/7/17/14/636989706097149850_njdswy_3649872.png"></div><p style="text-indent:25px">對任何一個(gè)企業(yè)對于設(shè)備采購、應(yīng)用的花費(fèi)都是屬于投資價(jià)值，使用的周期越長、功能越完善、減少維護(hù)費(fèi)用、故障率意味著對設(shè)備的投資價(jià)值得一體現(xiàn)，電話交換機(jī)做為一種企業(yè)通信辦公設(shè)備也不例外。在某些雷雨多發(fā)區(qū)域，雷電的危害被宿稱為：電話交換機(jī)***….每年此類設(shè)備遭受雷電的損壞不計(jì)其數(shù)，很大一部分設(shè)備是由于此原因而光榮“退伍”。由此集團(tuán)電話交換機(jī)、程控交換機(jī)防雷設(shè)備彰現(xiàn)出其很大價(jià)值。減少直接損害：防雷措施可以避免由于雷電等過壓、過流的原因?qū)е略O(shè)備的直接損壞或減少對設(shè)備的直接損壞。延長設(shè)備使用周期。非重復(fù)性投資：防雷設(shè)備可以伴隨電話交換機(jī)、程控交換機(jī)、調(diào)度機(jī)等設(shè)備的“一生”。通常設(shè)備的正常使用壽命周期大約在5-10年（視老化情況），而防雷設(shè)備幾乎不存在老化的情況，即使更換設(shè)備原有的防護(hù)設(shè)備仍然可以繼續(xù)有效使用。 3，低維護(hù)成本正常情況下，防雷設(shè)備是不需要維護(hù)，即使發(fā)生了每一次的損耗，如：被擊傳等現(xiàn)象，*需要更換該線路的**元件。每一次損耗都是對設(shè)備保護(hù)價(jià)值的體現(xiàn)。幾百元至幾千元的防雷設(shè)備投資對數(shù)千元甚至數(shù)萬的設(shè)備來講，完全是有價(jià)值的。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="福建電話交換機(jī)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(jī)內(nèi)部采用壓敏電阻+熱敏電阻+外部氣體放電管構(gòu)建成三級防雷措施，當(dāng)然也有更高級別的防護(hù)措施的如：高精斷的昂貴儀器采用四級、五級的防護(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(tuán)電話交換機(jī)設(shè)備來說有高于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達(dá)到70%以上，擁有內(nèi)部元件級防護(hù)（壓/熱敏元件）損失程度在50-20%之間，采用質(zhì)量好的三級防護(hù)損失程度會在20%--0% 輕微損壞或完全防護(hù)。各級放護(hù)元件根據(jù)其特性、標(biāo)準(zhǔn)值會有一個(gè)極限值當(dāng)遭遇強(qiáng)電超出其可耐受范圍時(shí) 就會出現(xiàn)“魚死網(wǎng)破”的局面…..防護(hù)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(dǎo)致防護(hù)元件無法重復(fù)使用必須更換，但相對于減輕對設(shè)備價(jià)值角度來講這點(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/322953.html</p></div></div></div></div></div><div id="hwyqh3c" class="page-right twoColRt"><div id="87c9ebs" class="box01 margin10 clearfix"><h3><a 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