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onmouseover="showsubmenu('數(shù)字微安表')">數(shù)字微安表</a> <div class="eqckvv83f" id="submenu_數(shù)字微安表" style="display:none"> <ul class="two_profl"> <li><a href="/SonList-538075.html">直流微安表</a></li> </ul> </div> </li> </ul> </div> </div> <div id="eqckvv83f" class="nymiddlezty"> <div id="eqckvv83f" class="mianbao">您現(xiàn)在的位置：<a href="/">首頁(yè)</a> > <a href="/article.html">技術(shù)文章</a> > 為什么要進(jìn)行絕緣電阻測(cè)試？</div> <div id="eqckvv83f" class="about_con"> <h1 class="newstit">為什么要進(jìn)行絕緣電阻測(cè)試？</h1> <div id="eqckvv83f" class="newstime"> <span id="eqckvv83f" class="skim"><em>瀏覽次數(shù)：</em>1015</span><span id="eqckvv83f" class="skimtim"><em>發(fā)布日期：</em>2023-01-31 </span> </div> <div>　　<strong>為什么要進(jìn)行絕緣電阻測(cè)試？</strong><br /> </div><div>　　絕緣電阻(IR)測(cè)試是20世紀(jì)早期發(fā)展起來(lái)的最古老、使用廣泛的評(píng)估絕緣質(zhì)量的測(cè)試。絕緣電阻測(cè)試是電氣安全測(cè)試標(biāo)準(zhǔn)要求的第二項(xiàng)測(cè)試。絕緣電阻測(cè)試包括測(cè)量被測(cè)設(shè)備的絕緣電阻，相線和中性線一起短路。測(cè)量的電阻必須高于國(guó)際標(biāo)準(zhǔn)規(guī)定的限值。兆歐表(又稱絕緣電阻測(cè)試儀、兆歐表)用于測(cè)量絕緣子在直流電壓下的歐姆值，非常穩(wěn)定。<br /> </div><div>　　絕緣不可能是完美的，就像某些東西不可能是無(wú)摩擦的一樣。這意味著總會(huì)有一點(diǎn)電流通過(guò)。這被稱為“漏電流"。良好的絕緣是可以接受的，但如果絕緣惡化，泄漏將開始引起麻煩。那么，什么是“好"絕緣材料？嗯，它需要對(duì)電流的高電阻，并且需要能夠長(zhǎng)時(shí)間保持高電阻<br /> </div><div>　<strong>　為什么要進(jìn)行絕緣電阻測(cè)試？</strong><br /> </div><div>　　絕緣材料開始老化。隨著年齡的增長(zhǎng)，其絕緣性能將下降。任何惡劣的安裝環(huán)境，特別是溫度和/或化學(xué)污染，都會(huì)加速這一過(guò)程。不同因素引起的應(yīng)力，如：<br /> </div><div>　　1.電氣應(yīng)力：主要與過(guò)電壓和欠電壓有關(guān)。<br /> </div><div>　　2.機(jī)械應(yīng)力：頻繁的啟動(dòng)和關(guān)閉順序會(huì)導(dǎo)致機(jī)械應(yīng)力。<br /> </div><div>　　3.旋轉(zhuǎn)機(jī)械的平衡以及電纜和通用設(shè)備上的任何直接應(yīng)力。<br /> </div><div>　　4.化學(xué)應(yīng)力：化學(xué)品、油、腐蝕性蒸汽和灰塵的接近通常會(huì)影響材料的絕緣性能。<br /> </div><div>　　5.與溫度變化有關(guān)的應(yīng)力：當(dāng)與啟動(dòng)和關(guān)閉順序引起的機(jī)械應(yīng)力結(jié)合時(shí)，膨脹和收縮應(yīng)力將影響絕緣材料的性能。溫度下操作也會(huì)導(dǎo)致材料老化。<br /> </div><div>　　6.環(huán)境污染導(dǎo)致絕緣老化加速。<br /> </div><div>　　這種磨損會(huì)降低絕緣材料的電阻率并增加泄漏電流，從而導(dǎo)致可能對(duì)安全(人員和財(cái)產(chǎn))和停機(jī)成本產(chǎn)生嚴(yán)重影響的事故。因此，為了采取糾正措施，必須快速識(shí)別這種惡化。除了在調(diào)試期間測(cè)量新的和翻新的設(shè)備外，定期對(duì)設(shè)備和設(shè)備進(jìn)行絕緣測(cè)試可以通過(guò)預(yù)防性維護(hù)幫助避免此類事故。這些測(cè)試在達(dá)到可能導(dǎo)致上述事件的水平之前檢測(cè)絕緣性能的老化和過(guò)早退化。<br /> </div><div>　　該測(cè)試通常用作客戶驗(yàn)收測(cè)試，單位長(zhǎng)度的最小絕緣電阻通常由客戶。從IR測(cè)試中獲得的結(jié)果對(duì)于發(fā)現(xiàn)絕緣中的局部缺陷沒有實(shí)際希波測(cè)試中那么有幫助，但提供了有關(guān)用作絕緣的散裝材料質(zhì)量的信息。<br /> </div><div>　　電線和電纜制造商使用絕緣電阻測(cè)試來(lái)跟蹤其絕緣制造過(guò)程，并在過(guò)程變量偏離允許限值之前確定問題。</div> <div class="eqckvv83f" id="news_sx"><li id="eqckvv83f" class="sx_left">上一篇：<a href="/Article-473864.html">互感器和電壓互感器的區(qū)別</a> <br />下一篇：<a href="/Article-473858.html">電力變壓器高壓試驗(yàn)主要試驗(yàn)項(xiàng)目</a></li></div> </div> </div> </div> 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