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</div> </div> <div id="iqaqewgi6e" class="nybanner"><img src="/skins/106676/images/nybanner.jpg"></div> <script src="http://www.chem17.com/mystat.aspx?u=mbdzkj"></script>  <div id="iqaqewgi6e" class="ncontent w_1100"> <div id="iqaqewgi6e" class="h-6">技術(shù)文章<span>您當(dāng)前的位置：<a href="/">首頁</a> > <a href="/article.html">技術(shù)文章</a> > 巧用SMG2000B數(shù)字雙鉗相位伏安表</span></div>  <div id="iqaqewgi6e" class="n-3 c-news"> <div id="iqaqewgi6e" class="newsnr"> <h1>巧用SMG2000B數(shù)字雙鉗相位伏安表</h1> <p class="source"><span>日期：2020-09-11</span><span>瀏覽：1462次</span></p> <div> <p style="margin: 2px 0px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24);"><font style="margin: 0px; padding: 0px;">1、如何用<span style="border:0px; font:inherit; margin:0px; padding:0px">SMG2000B數(shù)字雙鉗相位伏安表</span>進(jìn)行三相電壓相序的測量？</font></p><p style="margin: 2px 0px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24);"><font style="margin: 0px; padding: 0px;"> 將UAB（或UAO）電壓從U1端輸入，UBC（或UBO）電壓從U2端輸入，測量其相位角φ，如φ=120°，則為正相序；如φ=240°，則為負(fù)相序。亦可用兩把卡鉗測量其三相電流的相序。 <br /> <br />2、如何用<span style="border:0px; font:inherit; margin:0px; padding:0px">SMG2000B數(shù)字雙鉗相位伏安表</span>進(jìn)行感性電路、容性電路的判定？ <br /> 將被測電路的電壓從U1端輸入，電流經(jīng)卡鉗從I2插孔輸入，測量其相位。若測得相位φ1小于90°，則電路為感性；若測得的相位大于270°，則電路為容性。 <br /> 將被測電路的電流經(jīng)卡鉗從I1插孔輸入，電壓從U2端輸入，測量其相位，若測得相位φ2小于90°，則電路為容性；若測得的相位大于270°，則電路為感性。 <br /> <br />3、如何用<span style="border:0px; font:inherit; margin:0px; padding:0px">SMG2000B數(shù)字雙鉗相位伏安表</span>進(jìn)行功率因數(shù)的測量？ <br /> 由2測得感性電路相位功率因數(shù)角φ1、容性電路電流超前于電壓的相角φ2則可算出COSφ1、COSφ2為相應(yīng)功率因數(shù)值。 <br /> <br />4、如何用<span style="border:0px; font:inherit; margin:0px; padding:0px">SMG2000B數(shù)字雙鉗相位伏安表</span>進(jìn)行功率的測量？ <br /> 前面所述方法測得電壓U、電流I及φ，由φ算出功率因數(shù)COSφ后，根據(jù)公式P=UIcosφ計算功率。 <br /> <br />5、如何用<span style="border:0px; font:inherit; margin:0px; padding:0px">SMG2000B數(shù)字雙鉗相位伏安表</span>進(jìn)行變壓器接線組別的檢查？ <br /> 電力變壓器常采用Y/YO-12，YO/△-11，Y/△-11三種接線組別。當(dāng)采用Y/YO-12接法時，UAB與Uab同相，測其相位角為0°或360°；當(dāng)采用Y/△-11或YO/△-11接法時，Uab與UAB間相位角為30°即Uab超前UAB相位30°（腳標(biāo)A、B表示高壓繞組端，a、b表示低壓繞組端，0表示有中線聯(lián)接。） <br /> <br />6、如何用<span style="border:0px; font:inherit; margin:0px; padding:0px">SMG2000B數(shù)字雙鉗相位伏安表</span>進(jìn)行三相繞組聯(lián)接方式的判別？ <br /> 不論三相交流發(fā)電機(jī)的三相繞組或三相負(fù)載，或三相變壓器的高、低壓繞組，其聯(lián)接方式都有星形（又稱Y形）聯(lián)接和三角形（又稱△形）聯(lián)接方式。當(dāng)采用星形（Y形）聯(lián)接時，測得UAB與UA間相位角為30°（UAB超前UA相位角）；測得Uab與Ua間相位角為30°（Uab超前Ua相位角）。當(dāng)三相負(fù)載或三相變壓器的低電壓繞組采用三角形（△11形）聯(lián)接時，Uab超前Ua，其相位角為60°。 <br /> <br />7、如何用<span style="border:0px; font:inherit; margin:0px; padding:0px">SMG2000B數(shù)字雙鉗相位伏安表</span>進(jìn)行三相二元件有功電度表接線正確性的判斷？ <br /> 考慮到電流的進(jìn)出和三相電壓相序，七條輸入線有48種組合，這48種中只有兩種是正確的，錯誤的有46種（其中不轉(zhuǎn)12種，順轉(zhuǎn)數(shù)字不準(zhǔn)有10種，反轉(zhuǎn)有12種，隨COSφ變化，時順轉(zhuǎn)、時反轉(zhuǎn)的有12種）。使用該相位表能方便的讀測相位關(guān)系，判斷出兩種正確的接線。即測取UAB與IA相位角等于φ1，UCB與IC相位角等于φ2（是電壓超前電流的相角），若φ1-φ2=±300°，則接線正確。 <br /> <br />8、如何用<span style="border:0px; font:inherit; margin:0px; padding:0px">SMG2000B數(shù)字雙鉗相位伏安表</span>進(jìn)行估斷電度表運行的快慢？ <br /> 根據(jù)公式：T=3600n/NP（秒），先計算出電度表轉(zhuǎn)n圈時所用的理論時間T。式中：P—測定時電度表的負(fù)載功率（KW）；N—電度表的常數(shù)（轉(zhuǎn)/KWH），標(biāo)在電度表表盤上，然后測出電度表轉(zhuǎn)n轉(zhuǎn)時，實際所用時間t，比較t與T就可判斷電度表運行快慢。 <br /> <br />9、如何用<span style="border:0px; font:inherit; margin:0px; padding:0px">SMG2000B數(shù)字雙鉗相位伏安表</span>進(jìn)行漏電流的測量？ <br /> 該相位表具有*的電流分辯率，可作漏電流表使用。 <br /> i.對于兩相設(shè)備，當(dāng)設(shè)備不漏電時，兩線電流大小相等，方向相反，兩線電流之和為零，如果讓兩條線同時經(jīng)鉗口通過，則儀表電流顯示為零。如果有漏電，則兩線電流不等，這時相位表電流示數(shù)即為漏電流。 <br /> ii.對于三相三線設(shè)備，當(dāng)設(shè)備不漏電時，三相線電流之和應(yīng)為零，如果讓三條線從鉗口通過，則相位表電流正常顯示應(yīng)為零；如果有漏電，則相位表電流示數(shù)為漏電流數(shù)。 <br /> iii.對于三相四線設(shè)備，當(dāng)設(shè)備不漏電時，四線電流之和為零，如果讓四條線從鉗口通過，則相位表電流正常顯示應(yīng)為零；如果有漏電，則相位表電流示數(shù)為漏電流數(shù)。</font></p><p style="margin: 2px 0px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24);"><font style="margin: 0px; padding: 0px;"><img alt="" src="http://img73.chem17.com/9/20200911/637354103233279662289.jpg" style="height:445px; width:600px" /></font></p> <div id="iqaqewgi6e" class="clear"></div> </div> <div id="iqaqewgi6e" class="article"> <p>上一篇：<a href="/Article-2368919.html">高壓試驗變壓器使用方法</a></p> <p>下一篇：<a href="/Article-2368883.html">SMG2000B數(shù)字雙鉗相位伏安表結(jié)構(gòu)</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 id="iqaqewgi6e" class="h-2"><a 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