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class="source"><span>日期：2022-09-23</span><span>瀏覽：1404次</span></p> <div> <p><strong>絕緣電阻測(cè)試的原理和影響測(cè)試結(jié)果的因素</strong><br/></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; line-height: 24px; font-family: 宋體; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255);">一、絕緣電阻測(cè)試的原理</p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; line-height: 24px; font-family: 宋體; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255);">絕緣電阻測(cè)試儀對(duì)于絕緣電阻值的計(jì)算是基于歐姆定律的.通過(guò)輸出一個(gè)遠(yuǎn)低于介電強(qiáng)度測(cè)試的直流電壓,再測(cè)量出電流,就計(jì)算出絕緣電阻值了</p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; line-height: 24px; font-family: 宋體; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255);">實(shí)際上,絕緣電阻的阻值已經(jīng)非常大了,但也不是無(wú)限大,所以才能通過(guò)測(cè)量泄漏電流來(lái)進(jìn)行計(jì)算,兆歐表可以顯示絕緣電阻的電阻值,其結(jié)果一般是是kΩ、MΩ、GΩ,個(gè)別情況下甚至達(dá)到了TΩ.絕緣電阻值的大小直接表示了兩個(gè)導(dǎo)體之間的絕緣質(zhì)量。</p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; line-height: 24px; font-family: 宋體; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255);">絕緣電阻測(cè)試儀</p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; line-height: 24px; font-family: 宋體; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255);">二、影響絕緣電阻測(cè)試儀結(jié)果的因素</p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; line-height: 24px; font-family: 宋體; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255);">絕緣電阻測(cè)試儀的結(jié)果會(huì)被影響的原因,是因?yàn)殡娏髦凳峭ㄟ^(guò)在被試品施加一個(gè)恒定的電壓得到的.這些外在的因素，比如溫度何濕度素,都可能會(huì)嚴(yán)重影響測(cè)試結(jié)果.</p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; line-height: 24px; font-family: 宋體; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255);">首先我們分析一下絕緣測(cè)試時(shí)產(chǎn)生的電流性質(zhì),并假設(shè)這些因素均不會(huì)影響測(cè)量</p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; line-height: 24px; font-family: 宋體; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255);">絕緣材料在被施加電壓時(shí)總電流三個(gè)組成部分：電容電流，也叫電容充電電流</p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; line-height: 24px; font-family: 宋體; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255);">電容電流:在測(cè)試絕緣電阻時(shí)充電電流必須先充滿被測(cè)絕緣材料的電容.這個(gè)在測(cè)試瞬間電流開始時(shí)相對(duì)較大,一旦對(duì)被測(cè)電路充電完畢后又會(huì)以很快的速度下降至接近于零.在幾秒或十幾秒過(guò)后會(huì)變穩(wěn)定,這個(gè)電流小到相對(duì)于總電流來(lái)說(shuō)可以忽略不計(jì)的</p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; line-height: 24px; font-family: 宋體; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255);">吸收電流，吸收電流同電容電流不一樣，吸收電流下降的速度比電容充電電流要慢的多,一般需要幾分鐘才能達(dá)到一個(gè)趨近于零且穩(wěn)定數(shù)據(jù).</p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; line-height: 24px; font-family: 宋體; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255);">泄漏電流，也叫極化電流，是絕緣介質(zhì)在電壓的作用下產(chǎn)生極化過(guò)程中產(chǎn)生的一種電流，電流大小表明了絕緣質(zhì)量的好壞.容量大的電動(dòng)機(jī)或距離長(zhǎng)，截面大的電纜的電纜可能要30分鐘左右才能使電容充電電流和吸收電流降小且穩(wěn)定,從而讓絕緣測(cè)試獲取一個(gè)正確的結(jié)果</p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; line-height: 24px; font-family: 宋體; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255);">小結(jié):在電路中施加一個(gè)穩(wěn)定的電流,被試絕緣材料中的總電流隨時(shí)間變化而變化.這表示絕緣電阻也會(huì)隨著時(shí)間推移而發(fā)生顯著的變化</p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; line-height: 24px; font-family: 宋體; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255);">溫度的影響：溫度升高或者降低使絕緣電阻的數(shù)值也會(huì)產(chǎn)生變化.在預(yù)防性試驗(yàn)中,絕緣電阻的測(cè)試必須在相近的溫度下去進(jìn)行,如果達(dá)不到這個(gè)條件,則應(yīng)該設(shè)置一個(gè)參考溫度作為標(biāo)準(zhǔn)并予以換算修正.按照大概的準(zhǔn)則,如果溫度上升10℃,則電阻值下降為參考溫度點(diǎn)阻值的一半；如果溫度下降10℃,則阻值為參考值的2倍.</p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; line-height: 24px; font-family: 宋體; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255);">濕度對(duì)絕緣電阻測(cè)試儀的測(cè)試結(jié)果的影響主要要看絕緣體表面的污濁程度.但要特備注意,絕不能在溫度降至露點(diǎn)以下進(jìn)行絕緣電阻的測(cè)量</p> <div id="ubjn47ipz" class="clear"></div> </div> <div id="ubjn47ipz" class="article"> <p>上一篇：<a href="/Article-3142951.html">發(fā)電機(jī)轉(zhuǎn)子交流阻抗測(cè)試儀檢測(cè)原理</a></p> <p>下一篇：<a href="/Article-3142949.html">教你快速學(xué)會(huì)雙鉗相位伏安表使用方法</a></p> </div> <div id="ubjn47ipz" class="clear"></div> </div> </div> <div id="ubjn47ipz" class="n-9"> <div id="ubjn47ipz" class="c-right"> <div id="ubjn47ipz" class="c-1 r-pro"> <div id="ubjn47ipz" class="c-left"> <div id="ubjn47ipz" class="h-2"><a href="/products.html">產(chǎn)品分類</a></div> <ul> <li><a href="/ParentList-1388067.html" onmouseover="showsubmenu('大電流發(fā)生器')" class="yj">大電流發(fā)生器</a> <div class="ubjn47ipz" id="submenu_大電流發(fā)生器" style="display:none"> <ul> </ul> </div> </li> <li><a href="/ParentList-1384344.html" onmouseover="showsubmenu('LCR數(shù)字電橋')" class="yj">LCR數(shù)字電橋</a> <div 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