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characteristics</span></div> <link type="text/css" rel="stylesheet" href="/css/property.css"> <script> window.onload=function(){ changeTableHeight(); } window.onresize=function(){ changeTableHeight(); } function changeTableHeight(){ $(".proshowParameter table th").each(function?(i,o){ ????var $this=$(o),? ????height=$this.next().height(); ????$(this).css("height",height); var obj = $(o); var val = obj.text(); if(val == '' || val == null || val == undefined){ $(this).addClass('none'); }else{ $(this).removeClass('none'); } }); $(".proshowParameter table td").each(function?(i,o){ var obj = $(o); var val = obj.text(); if(val == '' || val == null || val == undefined){ $(this).addClass('none'); }else{ $(this).removeClass('none'); } }); } </script> <section class="proshowParameter"> <table style=" margin-bottom:20px;"> <tbody> </tbody> </table> </section><p>JYM-3FC二次壓降測試儀</p><p>JYM-3FC二次壓降測試儀</p><p></p><p>電能計(jì)量裝置存在的誤差為電能計(jì)量綜合誤差，是由電能表的誤差、電壓互感器的合成誤差、電流互感器的合成誤差和電壓互感器二次導(dǎo)線壓降引起的計(jì)量誤差所組成，可以用以下式子表示：<br /> ε=εw＋εTA＋εTV＋εr<br />式中 εw—電能表誤差%<br />εTA—電流互感器合成誤差%<br />εTV—電壓互感器合成誤差%<br />εr—電壓互感器二次導(dǎo)線壓降引起的計(jì)量誤差%<br />在電廠及變電站電能計(jì)量回路中，室外的電壓互感器離裝設(shè)于控制室配電盤上的電能表有較遠(yuǎn)的距離，一般在200～400 m左右，整個(gè)回路有接線端子排、開關(guān)、熔斷器及導(dǎo)線，必然存在著接觸電阻、導(dǎo)線電阻及分布參數(shù)，從而就存在著一定的回路阻抗，造成電壓互感器與電能表間的二次回路上有電壓降。電壓互感器二次回路壓降包括電纜、端子接觸電阻、熔線、中間繼電器接點(diǎn)、空氣小開關(guān)等電壓降之總和。電壓互感器二次電壓降引起的誤差，就是指電壓互感器二次端子和負(fù)載端子之間電壓的幅值差相對于二次實(shí)際電壓的百分?jǐn)?shù)，以及兩個(gè)電壓之間的相位差的總稱。<br />《電能計(jì)量裝置技術(shù)管理規(guī)程》DL／T448－2000的規(guī)定，電壓互感器二次回路壓降，對于I類計(jì)量裝置，應(yīng)不大于額定二次電壓的0．2％（注：三相三線電路壓降的允許值為0．2 V；三相四線電路壓降允許值為0.2/<img alt="28-1" src="file:///C:/DOCUME~1/ADMINI~1/LOCALS~1/Temp/msohtml1/01/clip_image001.jpg" style="height:23px; margin:0px; width:22px" />V）;其它計(jì)量裝置，應(yīng)不大于額定二次電壓的0．5％（注：三相三線電路壓降的允許值為0．5 V；三相四線電路壓降允許值為0．5／<img alt="28-1" src="file:///C:/DOCUME~1/ADMINI~1/LOCALS~1/Temp/msohtml1/01/clip_image001.jpg" style="height:23px; margin:0px; width:22px" />V）。對運(yùn)行中的電壓互感器二次回路壓降需進(jìn)行周期測試，以便算出由此引起的電能計(jì)量誤差，這對于進(jìn)行技術(shù)改進(jìn)，減小電能計(jì)量綜合誤差，降低計(jì)費(fèi)損失有著重要意義<br />電壓互感器二次回路壓降測量方法通常有間接測量法和直接測量法兩種（無線測量屬于間接測量法），由于間接測量法準(zhǔn)確度不太高，不能滿足測量要求，一般不采用此種方法，而直接測量法（校驗(yàn)儀測量法）采用測差原理，準(zhǔn)確度高，測量可靠，因此在實(shí)際測量中大量采用。</p><p><img src="http://www.singtront.com/templets/xingchuang/images/htcp_img25.jpg" style="margin:0px 8px 0px 0px" />產(chǎn)品別稱</p><p><img alt="" src="http://www.singtront.com/uploads/allimg/150429/1-1504291421180-L.jpg" style="height:704px; margin:0px; width:500px" /></p><p>⑴.可以實(shí)現(xiàn)三相三線，三相四線、單相全自動(dòng)測量；<br />⑵.使用工程塑料機(jī)箱，結(jié)識耐用，有效保障測試人員及系統(tǒng)安全；<br />⑶.儀器具有量程自動(dòng)切換功能，保證測試精度；<br />⑷.采用電子式原理線路結(jié)合DSP技術(shù)是使測試穩(wěn)定性好，抗干擾能力強(qiáng)；<br />⑸.測量完畢，自動(dòng)計(jì)算和負(fù)荷相關(guān)的各項(xiàng)參數(shù)，便于客戶分析和試驗(yàn)。<br />⑹.采用大屏幕漢字液晶顯示，所有操作均由漢字菜單提示；數(shù)據(jù)具備掉電存貯及瀏覽功能，能與計(jì)算機(jī)聯(lián)機(jī)傳送數(shù)據(jù)。<br />⑺.采用大容量7.2V11Ah鋰電池供電，對測試回路不產(chǎn)生任何影響，避免系統(tǒng)出現(xiàn)保護(hù)的情況。同時(shí)在現(xiàn)場無供電電源的情況下使用。<br />⑻.自動(dòng)切換量程：測量過程中可以根據(jù)測試對象數(shù)值的不同切換到不同的位置，使測量精度和顯示位數(shù)得到保證。<br />⑼.作時(shí)間可以長達(dá)24小時(shí)（zui長），可在充電狀態(tài)下測量。<br />⑽.附有輕巧充電器，方便測量，在電池電量不足的情況下可以外接充電器測量。<br />⑾.儀器體積小，重量輕。<br />⑿.極寬闊的二次工作電流/電壓范圍。在50mA的工作電流下，能分辨1mΩ的電阻和電抗，能測試二次額定電流為5A的S級電流互感器的在線實(shí)際負(fù)荷；在5V的工作電壓下，能分辨0.001mS的電導(dǎo)和電納。<br />⒀.能存儲480組測量數(shù)據(jù)，斷電后能保持十年。<br />⒁.中文界面大屏幕顯示，帶有RS-232通訊接口。</p><p>⑴.測量范圍：比差：0.001%～19.99% 角差：0.01’ ～599’<br />⑵.分辨率：比差：0.001% 角差：0.01’<br />⑶.儀器基本誤差<br />——DX=±(1%×X+1%×Y±2個(gè)字);<br />——DY=±(1%×X+1%×Y±2個(gè)字)。<br />2個(gè)字——儀器的量化誤差<br />⑷.電壓表頭準(zhǔn)確度：0.5%<br />⑸.工作范圍<br />——電壓：(50～120)V<br />⑹.儀器指示動(dòng)作值(提示錯(cuò)誤)<br />——誤差：比差大于20%或角差大于600’。<br />——電壓：電壓<2.0V。</p> </div> <link rel="stylesheet" type="text/css" href="/css/MessageBoard_style.css"> <script language="javascript" 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