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更新更新時(shí)間：2025-07-01</div> <div id="6whx3zha" class="inside_rnewcon"><p><strong><span style="font-family: 宋體, SimSun; font-size: 16px;">變壓器直流電阻測試：電橋法和電壓降法詳解</span></strong></p><p><span style="font-family: 宋體, SimSun; font-size: 16px;">變壓器的直流電阻測試主要有兩種方法：電橋法和電壓降法。直流電阻測試儀就是基于電橋法原理來工作的。以下是詳細(xì)的測試步驟和注意事項(xiàng)：</span></p><p><span style="font-family: 宋體, SimSun; font-size: 16px;">測試方法</span></p><p><span style="font-family: 宋體, SimSun; font-size: 16px;">接線：按照圖1的接線圖進(jìn)行連接。</span></p><p><span style="font-family: 宋體, SimSun; font-size: 16px;">開啟電源：打開直阻儀的電源開關(guān)，顯示“歡迎使用"后進(jìn)入“量程選擇"界面。使用“向上、向下"鍵選擇所需的測試量程，按下“確認(rèn)"鍵開始測量。</span></p><p><span style="font-family: 宋體, SimSun; font-size: 16px;">測量過程：</span></p><p><span style="font-family: 宋體, SimSun; font-size: 16px;">直阻儀進(jìn)入測量狀態(tài)時(shí)，LCD屏幕會(huì)顯示充電模擬條。充電完成后，屏幕顯示數(shù)值即為被測設(shè)備的直流電阻值。按下“確認(rèn)"鍵，數(shù)值將被保存并鎖定。</span></p><p><span style="font-family: 宋體, SimSun; font-size: 16px;">如果屏幕顯示“超量程"，按“返回"鍵返回上一級菜單，選擇高一檔的測試量程重新測試，或檢查測試回路是否開路。</span></p><p><span style="font-family: 宋體, SimSun; font-size: 16px;">數(shù)據(jù)打印：按“打印"鍵，數(shù)據(jù)將被打印。打印完畢后，儀器將自動(dòng)放電并返回上一級菜單。</span></p><p><span style="font-family: 宋體, SimSun; font-size: 16px;">測試結(jié)果的分析與判斷</span></p><p><span style="font-family: 宋體, SimSun; font-size: 16px;">測量位置：應(yīng)在各分接頭的所有位置上進(jìn)行測量。</span></p><p><span style="font-family: 宋體, SimSun; font-size: 16px;">1600kVA及以下的三相變壓器，各相測得值的相互差值應(yīng)小于平均值的4%，線間測得值的相互差值應(yīng)小于平均值的2%；1600kVA以上的三相變壓器，各相測得值的相互差值應(yīng)小于平均值的2%，線間測得值的相互差值應(yīng)小于平均值的1%。</span></p><p><span style="font-family: 宋體, SimSun; font-size: 16px;">與出廠值的比較：變壓器的直流電阻與同溫下產(chǎn)品出廠實(shí)測數(shù)值相比，變化不應(yīng)大于2%。不同溫度下的電阻值按照公式R2=R1•（T+t2）/（T+t1）進(jìn)行換算。式中R1、R2分別為溫度在t1、t2（℃）時(shí)的電阻值(Ω)，T為計(jì)算用常數(shù)，銅導(dǎo)線取235，鋁導(dǎo)線取225。</span></p><p><span style="font-family: 宋體, SimSun; font-size: 16px;">特殊情況：由于變壓器結(jié)構(gòu)等原因，差值超過第2款時(shí)，可只按第3款進(jìn)行比較，但應(yīng)說明原因。</span></p><p><span style="font-family: 宋體, SimSun; font-size: 16px;">無勵(lì)磁調(diào)壓變壓器：送電前最后一次測量，應(yīng)在使用的分接鎖定后進(jìn)行。</span></p><p><span style="font-family: 宋體, SimSun; font-size: 16px;">注意事項(xiàng)</span></p><p><span style="font-family: 宋體, SimSun; font-size: 16px;">測量時(shí)機(jī)：變壓器交接與大修時(shí)，應(yīng)在各側(cè)繞組所有分接頭位置上進(jìn)行測量；對有載調(diào)壓的變壓器也應(yīng)在所有分頭上測量；在小修時(shí)及運(yùn)行中更換分接頭位置后，在所用分接頭位置進(jìn)行測量。</span></p><p><span style="font-family: 宋體, SimSun; font-size: 16px;">溫度要求：測量時(shí)，要求繞組溫度與周圍環(huán)境溫度相差不超過3℃，并以頂層油溫作為繞組溫度。</span></p><p><span style="font-family: 宋體, SimSun; font-size: 16px;">電流穩(wěn)定：由于繞組的電感較大，電流需較長時(shí)間穩(wěn)定，須穩(wěn)定后再讀數(shù)。特別注意，接通電流后再接通電壓表或檢流計(jì)，斷開電壓表或檢流計(jì)后再斷開電源，以免損壞儀表。同時(shí)應(yīng)注意高反電勢危及人身安全。</span></p><p><span style="font-family: 宋體, SimSun; font-size: 16px;">表計(jì)和引線：試驗(yàn)時(shí)用的表計(jì)準(zhǔn)確度要高，引接線力求短、粗，并接觸牢固，否則將影響測量結(jié)果。</span></p><p><span style="font-family: 宋體, SimSun; font-size: 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