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href="/"><img src="/Skins/333987/images/home.png"></a><a href="/">網(wǎng)站首頁</a>><a href="/article.html">技術(shù)文章</a> > 回路電阻測(cè)試儀（接觸電阻測(cè)試儀）工作原理</div> <div id="tqrzhqzaxmzj" class="page-news"> <div id="tqrzhqzaxmzj" class="newshowheader"> <h1 class="nd_title">回路電阻測(cè)試儀（接觸電阻測(cè)試儀）工作原理</h1> <div id="tqrzhqzaxmzj" class="article-info"> <span> 瀏覽：</span> 1368<span id="tqrzhqzaxmzj" class="split">|</span> <span id="publishtime">更新時(shí)間：2020-04-30</span> <span id="tqrzhqzaxmzj" class="split">|</span> </div> </div> <div id="tqrzhqzaxmzj" class="page-newshow"> <p style="margin: 0px; padding: 0px; font-size: 16px; line-height: 24px; text-align: justify; font-family: arial;"><span id="tqrzhqzaxmzj" class="bjh-p">電力系統(tǒng)許多大電流電氣設(shè)備在預(yù)防性試驗(yàn)和交接試驗(yàn)中需要準(zhǔn)確測(cè)量回路的電阻值。斷路器是電力系統(tǒng)重要的電氣設(shè)備，依照zuixing標(biāo)準(zhǔn)《JJG1052-2009回路電阻檢定規(guī)程》、國(guó)標(biāo)GB763、GB50150和電力行業(yè)標(biāo)準(zhǔn)DL/T596對(duì)斷路器導(dǎo)電<span id="tqrzhqzaxmzj" class="bjh-a-hide" data-bjh-src-hide="https://baike.baidu.com/item/%E5%9B%9E%E8%B7%AF%E7%94%B5%E9%98%BB/1387445">回路電阻</span>的測(cè)量均作了規(guī)定：應(yīng)采用直流壓降法測(cè)量，電流不小于100A。</span></p><p style="margin: 22px 0px 0px; padding: 0px; font-size: 16px; line-height: 24px; text-align: justify; font-family: arial;"><span id="tqrzhqzaxmzj" class="bjh-p">斷路器導(dǎo)電回路的電阻主要取決于斷路器的動(dòng)、靜觸頭間的<span id="tqrzhqzaxmzj" class="bjh-a-hide" data-bjh-src-hide="https://baike.baidu.com/item/%E6%8E%A5%E8%A7%A6%E7%94%B5%E9%98%BB/8488111">接觸電阻</span>。接觸電阻的測(cè)量有許多種方法。日本學(xué)者Isao Minowa提出用超導(dǎo)量子器件測(cè)量接觸電阻，H.Archi提出利用電解槽法測(cè)量接觸電阻，波蘭學(xué)者 Jerzy Kaczarek提出用<span id="tqrzhqzaxmzj" class="bjh-a-hide" data-bjh-src-hide="https://baike.baidu.com/item/%E4%B8%89%E6%AC%A1%E8%B0%90%E6%B3%A2/347981">三次諧波</span>法測(cè)量接觸電阻，這些方法一般是在實(shí)驗(yàn)室條件下進(jìn)行電接觸研究所采用的方法。工程中，通常采用四端子法來測(cè)量實(shí)際觸點(diǎn)的接觸電阻。</span></p><p style="margin: 22px 0px 0px; padding: 0px; font-size: 16px; line-height: 24px; text-align: justify; font-family: arial;"><span id="tqrzhqzaxmzj" class="bjh-p">以前，通常采用直流雙臂 <span id="tqrzhqzaxmzj" class="bjh-a-hide" data-bjh-src-hide="https://baike.baidu.com/item/%E7%94%B5%E6%A1%A5/6424787">電橋</span>測(cè)量斷路器的接觸電阻。但是，當(dāng)使用雙臂電橋進(jìn)行斷路器導(dǎo)電<span id="tqrzhqzaxmzj" class="bjh-a-hide" data-bjh-src-hide="https://baike.baidu.com/item/%E5%9B%9E%E8%B7%AF%E7%94%B5%E9%98%BB/1387445">回路電阻</span>的測(cè)量時(shí)，由于雙臂電橋測(cè)量回路通過的是微弱的電流，難以消除電阻較大的氧化膜，測(cè)出的電阻示值偏大，但氧化膜在大的電流下很容易被擊穿，不妨礙正常電流通過。因此，測(cè)試采用直流壓降法測(cè)試時(shí)，電流不得太小。</span></p><p style="margin: 22px 0px 0px; padding: 0px; font-size: 16px; line-height: 24px; text-align: justify; font-family: arial;"><span id="tqrzhqzaxmzj" class="bjh-p"><span id="tqrzhqzaxmzj" class="bjh-a-hide" data-bjh-src-hide="https://baike.baidu.com/item/%E9%AB%98%E5%8E%8B%E6%96%AD%E8%B7%AF%E5%99%A8/3066977">高壓斷路器</span>導(dǎo)電回路的電阻主要取決于斷路器的動(dòng)、靜觸頭間的<span id="tqrzhqzaxmzj" class="bjh-a-hide" data-bjh-src-hide="https://baike.baidu.com/item/%E6%8E%A5%E8%A7%A6%E7%94%B5%E9%98%BB/8488111">接觸電阻</span>。接觸電阻的存在，增加了導(dǎo)體在通電時(shí)的損耗，使接觸處的溫度升高，其值的大小直接影響正常工作時(shí)的載流能力，在一定程度上影響<span id="tqrzhqzaxmzj" class="bjh-a-hide" data-bjh-src-hide="https://baike.baidu.com/item/%E7%9F%AD%E8%B7%AF%E7%94%B5%E6%B5%81/5260576">短路電流</span>的切斷能力。因此，斷路器每相導(dǎo)電<span id="tqrzhqzaxmzj" class="bjh-a-hide" data-bjh-src-hide="https://baike.baidu.com/item/%E5%9B%9E%E8%B7%AF%E7%94%B5%E9%98%BB/1387445">回路電阻</span>值是斷路器安裝、檢修、質(zhì)量驗(yàn)收的一項(xiàng)重要數(shù)據(jù)。</span></p><p style="margin: 22px 0px 0px; padding: 0px; font-size: 16px; line-height: 24px; text-align: justify; font-family: arial;"><span id="tqrzhqzaxmzj" class="bjh-p">由于開關(guān)觸頭之間存在氧化膜，如果用較小的電流檢測(cè)，由于氧化膜的影響測(cè)試結(jié)果一般偏大很多，但氧化膜在大電流下是能被擊穿的，理論上，測(cè)試電流只要不超過額定電流，應(yīng)該是越大越好，但規(guī)程在制定的時(shí)候考慮到當(dāng)時(shí)國(guó)內(nèi)相關(guān)儀器的生產(chǎn)水平，作出了不得小于100A電流的規(guī)定。</span></p><p style="margin: 22px 0px 0px; padding: 0px; font-size: 16px; line-height: 24px; text-align: justify; font-family: arial;"><span id="tqrzhqzaxmzj" class="bjh-p">電力設(shè)備的接地引下線與地網(wǎng)的可靠、有效連接是電力設(shè)備安全運(yùn)行及操作人員人身安全的根本保證。雖然在制作接地裝置時(shí)，已對(duì)接地引下線連結(jié)處做了必要的防腐處理，但位于土壤中的連結(jié)點(diǎn)，仍會(huì)長(zhǎng)期受到潮濕等因素的影響，出現(xiàn)接點(diǎn)腐蝕、開斷、松脫等現(xiàn)象，導(dǎo)致接地引下線與地網(wǎng)接觸點(diǎn)電阻值增大，不能達(dá)到電力規(guī)程的要求，使設(shè)備在運(yùn)行中存在不安全隱患，嚴(yán)重時(shí)造成設(shè)備脫開地網(wǎng)運(yùn)行?？捎糜趯?duì)電力設(shè)備接地引下線與<span id="tqrzhqzaxmzj" class="bjh-a-hide" data-bjh-src-hide="https://baike.baidu.com/item/%E6%8E%A5%E5%9C%B0%E7%BD%91/5201687">接地網(wǎng)</span>或相鄰設(shè)備之間導(dǎo)通電阻值的精確測(cè)量。</span></p><p style="margin: 22px 0px 0px; padding: 0px; font-size: 16px; line-height: 24px; text-align: justify; font-family: arial;"><span id="tqrzhqzaxmzj" class="bjh-p"><img alt="" src="http://img68.chem17.com/9/20200430/637238317594998936319.jpg" style="width:800px" /></span></p><div id="tqrzhqzaxmzj" class="img-container" style="margin-top: 30px; color: rgb(0, 0, 0); font-family: arial; font-size: 12px;"><span id="tqrzhqzaxmzj" class="bjh-a-hide" data-bjh-src-hide="https://baike.baidu.com/item/%E5%9C%B0%E7%BD%91%E5%AF%BC%E9%80%9A%E7%94%B5%E9%98%BB%E6%B5%8B%E8%AF%95%E4%BB%AA/10159991" style="color:rgb(51, 51, 51); font-size:16px; text-align:justify">地網(wǎng)導(dǎo)通電阻測(cè)試儀</span><span style="color:rgb(51, 51, 51); font-size:16px; text-align:justify">用于測(cè)量接地引下線導(dǎo)通電阻值，通過歷年測(cè)試值及相鄰點(diǎn)測(cè)試值比較來判定</span><span id="tqrzhqzaxmzj" class="bjh-a-hide" data-bjh-src-hide="https://baike.baidu.com/item/%E6%95%85%E9%9A%9C%E7%82%B9/5213939" style="color:rgb(51, 51, 51); font-size:16px; text-align:justify">故障點(diǎn)</span><span style="color:rgb(51, 51, 51); font-size:16px; text-align:justify">。地網(wǎng)導(dǎo)通電阻測(cè)試儀工作電源由內(nèi)部鋰電池提供，無需外接交流電源，測(cè)試過程由單片機(jī)控制完成，具有操作簡(jiǎn)單、測(cè)試速度快、測(cè)試數(shù)據(jù)穩(wěn)定、便于攜帶等特點(diǎn)。</span></div><p style="margin: 22px 0px 0px; padding: 0px; font-size: 16px; line-height: 24px; text-align: justify; font-family: arial;"><span id="tqrzhqzaxmzj" class="bjh-p">由于斷路器<span id="tqrzhqzaxmzj" class="bjh-a-hide" data-bjh-src-hide="https://baike.baidu.com/item/%E6%8E%A5%E8%A7%A6%E7%94%B5%E9%98%BB/8488111">接觸電阻</span>很小，只有用很高的電流檢測(cè)，才能保證一定的精度，抗干擾能力也越強(qiáng)。用于斷路器接觸電阻和<span id="tqrzhqzaxmzj" class="bjh-a-hide" data-bjh-src-hide="https://baike.baidu.com/item/%E8%BD%BD%E6%B5%81%E5%AF%BC%E4%BD%93/6827952">載流導(dǎo)體</span>電阻的<span id="tqrzhqzaxmzj" class="bjh-a-hide" data-bjh-src-hide="https://baike.baidu.com/item/%E9%AB%98%E7%B2%BE%E5%BA%A6%E6%B5%8B%E9%87%8F/12738363">高精度測(cè)量</span>，能長(zhǎng)時(shí)間、穩(wěn)定輸出大電流，符合DL\T845.4-2004《電阻測(cè)量裝置通用技術(shù)條件第四部份:回路電阻測(cè)試儀》的相關(guān)規(guī)定。</span></p><p style="margin: 22px 0px 0px; padding: 0px; font-size: 16px; line-height: 24px; text-align: justify; font-family: arial;"><span id="tqrzhqzaxmzj" class="bjh-p">作者：上?？档请姎馐菄?guó)內(nèi)專業(yè)的電力承裝（修、試）資質(zhì)及電力承試設(shè)備研發(fā)生產(chǎn)企，專業(yè)針對(duì)不同電壓等級(jí)的試驗(yàn)需求，定制不同配置的電氣試驗(yàn)產(chǎn)品。</span></p> </div> 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