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<div id="1571n5fppxr7" class="inside_rnewtime">點(diǎn)擊次數(shù)：452 更新時(shí)間：2024-08-13</div> <div id="1571n5fppxr7" class="inside_rnewcon"><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(59, 59, 59); font-family: 宋體; white-space: normal; background-color: rgb(255, 255, 255);"><span style="font-size: 16px;"><strong><span style="font-family: 宋體, SimSun;">直流電阻測(cè)試儀測(cè)試直流電阻的兩種方法</span></strong></span><span style="font-family: 宋體, SimSun; font-size: 16px;"> </span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(59, 59, 59); font-family: 宋體; white-space: normal; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體, SimSun; font-size: 16px;"> 直流電阻測(cè)試是變壓器、電抗器等線圈類設(shè)備既簡便又重要的一個(gè)試驗(yàn)項(xiàng)目。主要用來測(cè)量繞組連同套管的直流電阻能夠有效檢測(cè)繞組內(nèi)部導(dǎo)線接頭的焊接質(zhì)量。檢查引線與繞組接頭的焊接質(zhì)量，電壓分接開關(guān)各個(gè)分接位置及引線與套管的接觸是否良好，并聯(lián)支路連接是否正確，變壓器載流部分有無斷路，接觸不良以及層、匝間有無短路現(xiàn)象。一般采用直流電阻測(cè)試儀進(jìn)行直流電阻的測(cè)試，常規(guī)的測(cè)試方法如下：</span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(59, 59, 59); font-family: 宋體; white-space: normal; background-color: rgb(255, 255, 255); text-align: center;"><br/></p><p style="text-align: center"><img style="max-width: 800px; max-height: 300%; width: 421px; height: 421px;" src="https://img46.chem17.com/9/20240813/638591342621984425120.jpg" title="20A直流電阻測(cè)試儀.jpg" alt="20A直流電阻測(cè)試儀.jpg" width="421" height="421"/></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(59, 59, 59); font-family: 宋體; white-space: normal; background-color: rgb(255, 255, 255); text-align: center;"><br/></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(59, 59, 59); font-family: 宋體; white-space: normal; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體, SimSun; font-size: 16px;">??1、電橋法，應(yīng)用電橋平衡的原理來測(cè)量繞組直流電阻的方法稱為電橋法，分為兩種，一是單臂電橋(惠斯登電橋)，二是雙臂電橋(凱爾文電橋)。</span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(59, 59, 59); font-family: 宋體; white-space: normal; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體, SimSun; font-size: 16px;">??1)單臂電橋，單臂電橋的測(cè)量原理如圖2-1所示，xR是被測(cè)電阻。當(dāng)Rx上的電壓降等于R3上的電壓降時(shí)，則A、B兩點(diǎn)沒有電位差，即檢流計(jì)中沒有電流，此時(shí)1I流經(jīng)xR和2R ，2I 流經(jīng)3R和4R，電橋達(dá)到平衡。</span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(59, 59, 59); font-family: 宋體; white-space: normal; background-color: rgb(255, 255, 255); text-align: center;"><img src="https://img41.chem17.com/9/20240813/638591342311888435462.jpg" alt="直流電阻測(cè)試單臂電橋法" width="489" height="393" title="直流電阻測(cè)試單臂電橋法" align="" style="margin: 0px; padding: 0px; border: 0px; vertical-align: top; display: inline-block; outline: none; width: 489px; height: 393px;"/></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(59, 59, 59); font-family: 宋體; white-space: normal; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體, SimSun; font-size: 16px;">??2)雙臂電橋，雙臂電橋的接線特點(diǎn)是將連接及Rn的試驗(yàn)用電流線和電壓線分開，利用電壓線把Rx 及Rn上的壓降引到橋內(nèi)平衡，使通過電流的引線與接線的接觸電阻上壓降不引入橋內(nèi)，這樣就消除了接觸電阻及引線電阻的影響，適宜測(cè)量準(zhǔn)確度要求高的小電阻。</span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(59, 59, 59); font-family: 宋體; white-space: normal; background-color: rgb(255, 255, 255); text-align: center;"><img src="https://img48.chem17.com/9/20240813/638591342313298016340.jpg" alt="直流電阻測(cè)試雙臂電橋法" width="428" height="293" title="直流電阻測(cè)試雙臂電橋法" align="" style="margin: 0px; padding: 0px; border: 0px; vertical-align: top; display: inline-block; outline: none; width: 428px; height: 293px;"/></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(59, 59, 59); font-family: 宋體; white-space: normal; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體, SimSun; font-size: 16px;">??原理圖如圖2-2所示，圖中P為檢流計(jì)，XR為被測(cè)電阻，R3 、R4 、'R3及'R4為橋臂電阻，NR為標(biāo)準(zhǔn)電阻，C1、C2為被測(cè)電阻的電流接頭，P1 、P2為被測(cè)電阻的電壓接頭。</span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(59, 59, 59); font-family: 宋體; white-space: normal; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體, SimSun; font-size: 16px;">??2、電流電壓表法</span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(59, 59, 59); font-family: 宋體; white-space: normal; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體, SimSun; font-size: 16px;">??電流電壓表法又稱伏安法，是最原始簡便的方法，它的原理是在被測(cè)繞組中通以直流電流，因而在繞組的電阻上產(chǎn)生電壓降，只要測(cè)出電路中的電流 I 和負(fù)載兩端的電壓降U，根據(jù)歐姆定律 R=U/I ，就可以計(jì)算出電阻R 。電阻的測(cè)量方法見圖2-3，根據(jù)測(cè)量微小電阻的需要，此時(shí)伏安法采用的是外接法。</span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(59, 59, 59); font-family: 宋體; white-space: normal; background-color: rgb(255, 255, 255); text-align: center;"><img src="https://img46.chem17.com/9/20240813/638591342314294525431.jpg" alt="直流電阻測(cè)試伏安法" width="557" height="319" title="直流電阻測(cè)試伏安法" align="" style="margin: 0px; padding: 0px; border: 0px; vertical-align: top; display: inline-block; outline: none; width: 557px; height: 319px;"/></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(59, 59, 59); font-family: 宋體; white-space: normal; background-color: rgb(255, 255, 255);"><span style="font-family: 宋體, SimSun; font-size: 16px;">??直流電阻測(cè)試儀測(cè)量用儀表準(zhǔn)確度應(yīng)不低于0.5級(jí)，電壓表應(yīng)盡量選內(nèi)阻大的4位高精度數(shù)字萬用表，電流表應(yīng)選用內(nèi)阻相對(duì)較小的。萬用表內(nèi)的電源(電池)通過表筆與電阻相聯(lián)接，在萬用表內(nèi)部測(cè)量此時(shí)的電壓和電流，由圖可以看出萬用表實(shí)際測(cè)量到的電阻值包括被測(cè)電阻XR及表筆饋線電阻RL1和RL2 。</span></p><p><br/></p></div> <div id="1571n5fppxr7" class="inside_newsthree"> <p 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