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font-size:12px">直流電阻測量是以便查驗繞組電焊焊接和繞組中間匝間短路故障的品質(zhì)，分接電源開關(guān)部位是不是恰當(dāng)、具體部位是不是與標(biāo)示一致、導(dǎo)線是不是破裂或松脫、串聯(lián)繞組的繞組沒有斷股等。直流電阻測試儀的測量不但是變電器維修，預(yù)測分析試和分接電源開關(guān)部位更改后的基礎(chǔ)測試報告，還是常見故障后的關(guān)鍵檢查項目。</span></p><div style="margin: 0px; padding: 0px; list-style: none; border: 0px; font-family: 宋體; font-size: 12px;">　　直流電阻測試儀在使用過程中，當(dāng)設(shè)備多測量的電阻值超過限制時，首先要考慮是否存在測量誤差，例如是否連接了外部引線，測試引線是否過長或過細(xì)，接觸是否良好，電橋中的電池電壓是否不足等等；</div><div style="margin: 0px; padding: 0px; list-style: none; border: 0px; font-family: 宋體; font-size: 12px;">　　其次，要了解直流電阻的電阻值受溫度的影響很大，因此必須將其轉(zhuǎn)換為相同的溫度，（通常為20℃，R20=（T+20）/（T+T），T銅=235）進(jìn)行比較，并且一般以上層油溫為基礎(chǔ)。</div><div style="margin: 0px; padding: 0px; list-style: none; border: 0px; font-family: 宋體; font-size: 12px;">　　再者當(dāng)前使用的三相配電變壓器，高壓繞組采用Y形接線，當(dāng)電阻值超過極限值時，也可以使用以下公式[RA=（RAB+rac-rbc）/2，RB=（RAB+rac-rac）/2，RC（RBC+rac-rab）/2]，以便找出缺陷相；</div><div style="margin: 0px; padding: 0px; list-style: none; border: 0px; font-family: 宋體; font-size: 12px;">　　后分析是否分接開關(guān)接觸不良，導(dǎo)致電阻值偏高的情況比較普遍，如開關(guān)干凈電鍍掉，彈簧壓力不足，應(yīng)力不均勻以及過電壓觸點積碳，都會導(dǎo)致電阻值導(dǎo)通。這時，分接開關(guān)蓋應(yīng)打開，轉(zhuǎn)動幾次，一般即可消除。</div><div style="margin: 0px; padding: 0px; list-style: none; border: 0px; font-family: 宋體; font-size: 12px;">　　如果經(jīng)過以上四點檢查后仍超過極限，那就可能是繞組和引線虛焊，焊接，斷線或?qū)佣搪坊蚶@組燒壞，使用者可根據(jù)實際進(jìn)行處理。</div><p align="center" style="margin: 0px; padding: 0px; font-family: 宋體; font-size: 12px;"><img alt="" src="http://img76.chem17.com/9/20201207/637429405089611007758.png" style="height:682px; width:668px" /></p> <div id="iqaqewgi6e" class="clear"></div> </div> <div id="iqaqewgi6e" class="article"> <p>上一篇：<a href="/Article-2474150.html">直流低電阻測試儀使用方法</a></p> <p>下一篇：<a href="/Article-2474143.html">QJ36S直流低電阻測試儀性能特點</a></p> </div> <div id="iqaqewgi6e" class="clear"></div> </div> </div> <div id="iqaqewgi6e" class="n-9"> <div id="iqaqewgi6e" class="c-right"> <div id="iqaqewgi6e" class="c-1 r-pro"> <div id="iqaqewgi6e" class="c-left"> <div 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</div> </li> <li><a href="/ParentList-1324114.html" onmouseover="showsubmenu('紅外線測溫儀')" class="yj">紅外線測溫儀</a> <div class="iqaqewgi6e" id="submenu_紅外線測溫儀" style="display:none"> <ul> <li><a href="/SonList-1416980.html">> ET紅外線測溫儀</a></li> <li><a href="/SonList-1416968.html">> SM紅外線測溫儀</a></li> <li><a href="/SonList-1341762.html">> OT-8898紅外線測溫儀</a></li> <li><a href="/SonList-1324120.html">> 噪聲儀</a></li> <li><a href="/SonList-1324119.html">> 測厚儀</a></li> <li><a href="/SonList-1324118.html">> 軸承故障測試儀</a></li> <li><a href="/SonList-1324117.html">> 測振儀</a></li> <li><a href="/SonList-1324116.html">> 轉(zhuǎn)速表</a></li> <li><a href="/SonList-1324115.html">> 測溫儀</a></li> </ul> </div> </li> <li><a href="/ParentList-1349465.html" onmouseover="showsubmenu('避雷器及絕緣子測試儀器')" class="yj">避雷器及絕緣子測試儀器</a> <div class="iqaqewgi6e" id="submenu_避雷器及絕緣子測試儀器" style="display:none"> <ul> <li><a href="/SonList-1349472.html">> 無線絕緣子測試儀</a></li> <li><a href="/SonList-1349471.html">> 避雷器放電計數(shù)器校驗儀</a></li> <li><a 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