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class="inside_rnewtil">直流電阻測(cè)試儀使用不同電源的測(cè)量方法</h1> <div id="1571n5fppxr7" class="inside_rnewtime">點(diǎn)擊次數(shù)：550 更新時(shí)間：2023-09-11</div> <div id="1571n5fppxr7" class="inside_rnewcon"><p><span>直流電阻測(cè)試儀使用不同電源的測(cè)量方法 </span></p><p><span>快速充電和直流電阻自動(dòng)測(cè)試儀</span></p><p><span><br/></span></p><p><span>測(cè)量直流電阻使用儀器單一，操作也不復(fù)雜。但是測(cè)量大容量電力變壓器的直流電阻時(shí)，由于變壓器繞組具有很大電感，接通直流電源后，電流不能突變，上升緩慢。</span></p><p><span><br/></span></p><p><span>根據(jù)歐姆定律，R=U/I，在加上電壓最初瞬間，由于電流很小，測(cè)得的電阻很大。隨著充電電流的逐漸增大，電阻逐漸減小。最后電流趨于穩(wěn)定，這時(shí)才能測(cè)得真實(shí)的電阻值。整個(gè)充電過(guò)程需要幾分鐘，甚至十幾分鐘。而且每臺(tái)變壓器一、二次兩側(cè)共有6個(gè)繞組。高壓繞組還有許多分接頭，每個(gè)分接頭都要測(cè)量直流電阻</span></p><p><span> 這樣一來(lái)，整個(gè)測(cè)試過(guò)程耗費(fèi)時(shí)間很長(zhǎng)。為了節(jié)省時(shí)間，需要采用特殊方法實(shí)現(xiàn)快速充電。例如目前用得較多的全壓恒流電源作為測(cè)量電源就能收到快速充電的效果。測(cè)試開始時(shí)，接通全壓直流電源，電源電壓較高，充電電流較大。當(dāng)充電電流上升到某一設(shè)定的電流I0時(shí)，全壓直流電源開關(guān)自動(dòng)斷開，這時(shí)恒流電源 (電壓4V)自動(dòng)接通。</span></p><p><span><br/></span></p><p><span>由于電壓較低，充電電流不再上升，由恒流電源向被試品繞組供給一個(gè)穩(wěn)定電流，電路進(jìn)入強(qiáng)制穩(wěn)態(tài)，充電過(guò)程隨之結(jié)束。隨著電子技術(shù)和微處理器技術(shù)的飛速發(fā)展，目前已出現(xiàn)了多種基于直流壓降法的直流電阻快速測(cè)試儀，不僅測(cè)量精度高，而且測(cè)試速度快，已在現(xiàn)場(chǎng)電氣試驗(yàn)中得到廣泛應(yīng)用。</span></p><p><span></span></p><p style="text-align: center"><img style="max-width:800px;max-height:300%;" src="https://img56.chem17.com/9/20230911/638300191785954356270.jpg" title="20A直流電阻測(cè)試儀.jpg" alt="20A直流電阻測(cè)試儀.jpg"/></p><p><span></span><br/></p><p><span>測(cè)量直流電阻的注意事項(xiàng)</span></p><p><span><br/></span></p><p><span>測(cè)量電感性被試物時(shí)的充電過(guò)程。在測(cè)量電感性被試物時(shí)，例如測(cè)量變壓器類產(chǎn)品的直流電阻時(shí)，要有一個(gè)充電過(guò)程。在剛給上直流電源的瞬間被測(cè)回路電流不能突變，因此顯示的“阻值"很大，隨著時(shí)間的延長(zhǎng)，充電過(guò)程逐漸結(jié)束，“阻值"逐漸下降，最后穩(wěn)定在某一數(shù)值，這才是測(cè)得的最后結(jié)果。因此如果用普通雙臂電橋測(cè)量高電壓大容量電力變壓器的直流電阻，需要很長(zhǎng)的充電時(shí)間才能測(cè)得較為準(zhǔn)確的結(jié)果。</span></p><p><br/></p></div> <div id="1571n5fppxr7" 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