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現(xiàn)場巧用SMG2000B數(shù)字雙鉗相位伏安表</span></div>  <div id="yq00aqiue" class="n-3 c-news"> <div id="yq00aqiue" class="newsnr"> <h1>現(xiàn)場巧用SMG2000B數(shù)字雙鉗相位伏安表</h1> <p class="source"><span>日期：2020-09-03</span><span>瀏覽：1164次</span></p> <div> <p><strong>現(xiàn)場巧用SMG2000B數(shù)字雙鉗相位伏安表</strong></p><p> <span style="color:rgb(24, 24, 24); font-family:微軟雅黑,arial,宋體; font-size:15px">1、如何用</span><span style="border:0px; color:rgb(24, 24, 24); font:inherit; margin:0px; padding:0px">SMG2000B數(shù)字雙鉗相位伏安表</span><span style="color:rgb(24, 24, 24); font-family:微軟雅黑,arial,宋體; font-size:15px">進行三相電壓相序的測量？</span></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。當采用Y/YO-12接法時，UAB與Uab同相，測其相位角為0°或360°；當采用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>進行三相繞組聯(lián)接方式的判別？ <br /> 不論三相交流發(fā)電機的三相繞組或三相負載，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）。當三相負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12種，順轉數(shù)字不準有10種，反轉有12種，隨COSφ變化，時順轉、時反轉的有12種）。使用該相位表能方便的讀測相位關系，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n圈時所用的理論時間T。式中：P—測定時電度表的負載功率（KW）；N—電度表的常數(shù)（轉/KWH），標在電度表表盤上，然后測出電度表轉n轉時，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.對于兩相設備，當設備不漏電時，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.對于三相三線設備，當設備不漏電時，三相線電流之和應為零，如果讓三條線從鉗口通過，則相位表電流正常顯示應為零；如果有漏電，則相位表電流示數(shù)為漏電流數(shù)。 <br /> iii.對于三相四線設備，當設備不漏電時，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://img74.chem17.com/9/20200903/637347163899168537282.jpg" style="height:445px; width:600px" /> </font></p> <div id="yq00aqiue" class="clear"></div> </div> <div id="yq00aqiue" class="article"> <p>上一篇：<a href="/Article-2358049.html">什么是氧化鋅避雷器？其試驗項目有哪幾種？</a></p> <p>下一篇：<a 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