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class="inpage_content"> <div id="nxnzvbt5" class="nr_main_box"> <h1 class="inside_rnewtil">直流電阻測試儀使用不同電源的測量方法</h1> <div id="nxnzvbt5" class="inside_rnewtime">點擊次數(shù)：551 更新時間：2023-09-11</div> <div id="nxnzvbt5" class="inside_rnewcon"><p><span>直流電阻測試儀使用不同電源的測量方法 </span></p><p><span>快速充電和直流電阻自動測試儀</span></p><p><span><br/></span></p><p><span>測量直流電阻使用儀器單一，操作也不復(fù)雜。但是測量大容量電力變壓器的直流電阻時，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，這時才能測得真實的電阻值。整個充電過程需要幾分鐘，甚至十幾分鐘。而且每臺變壓器一、二次兩側(cè)共有6個繞組。高壓繞組還有許多分接頭，每個分接頭都要測量直流電阻</span></p><p><span> 這樣一來，整個測試過程耗費(fèi)時間很長。為了節(jié)省時間，需要采用特殊方法實現(xiàn)快速充電。例如目前用得較多的全壓恒流電源作為測量電源就能收到快速充電的效果。測試開始時，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，全壓直流電源開關(guān)自動斷開，這時恒流電源 (電壓4V)自動接通。</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穩(wěn)定電流，電路進(jìn)入強(qiáng)制穩(wěn)態(tài)，充電過程隨之結(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試儀，不僅測量精度高，而且測試速度快，已在現(xiàn)場電氣試驗中得到廣泛應(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直流電阻測試儀.jpg" alt="20A直流電阻測試儀.jpg"/></p><p><span></span><br/></p><p><span>測量直流電阻的注意事項</span></p><p><span><br/></span></p><p><span>測量電感性被試物時的充電過程。在測量電感性被試物時，例如測量變壓器類產(chǎn)品的直流電阻時，要有一個充電過程。在剛給上直流電源的瞬間被測回路電流不能突變，因此顯示的“阻值"很大，隨著時間的延長，充電過程逐漸結(jié)束，“阻值"逐漸下降，最后穩(wěn)定在某一數(shù)值，這才是測得的最后結(jié)果。因此如果用普通雙臂電橋測量高電壓大容量電力變壓器的直流電阻，需要很長的充電時間才能測得較為準(zhǔn)確的結(jié)果。</span></p><p><br/></p></div> <div id="nxnzvbt5" class="inside_newsthree"> <p id="newsprev">上一篇：<b class="newsprev"><a href="/Article-3476186.html">管線探測儀如何探測故障定位點</a></b></p> <p id="newsnext">下一篇：<b 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