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id="5hlvxzllpl3" class="page-news"> <div id="5hlvxzllpl3" class="newshowheader"> <h1 class="nd_title">變壓器變比使用方法</h1> <div id="5hlvxzllpl3" class="article-info"> <span> 瀏覽：</span> 2203<span id="5hlvxzllpl3" class="split">|</span> <span id="publishtime">更新時(shí)間：2016-09-24</span> <span id="5hlvxzllpl3" class="split">|</span> </div> </div> <div id="5hlvxzllpl3" class="page-newshow"> <p> 變壓器的電壓比(簡稱變比)，是變壓器空載時(shí)高壓繞組電壓U<sub>1</sub>與低壓繞組電壓U<sub>2</sub>的比值，即變比k=U<sub>1</sub>／U<sub>2。</sub>變壓器的變比實(shí)驗(yàn)是驗(yàn)證變壓器能否到達(dá)規(guī)則的電壓改換作用，變比是不是契合變壓器技能或銘牌所規(guī)則的數(shù)值的一項(xiàng)實(shí)驗(yàn)。其意圖是查看各繞組的匝數(shù)、引線安裝、分接開關(guān)指示方位是不是契合需求；供給變壓器能否與其他變壓器并排運(yùn)轉(zhuǎn)的依據(jù)。變比相差1%的中小型變壓器并排運(yùn)轉(zhuǎn)，會(huì)在變壓器繞組內(nèi)發(fā)生10%額外電流的循環(huán)電流，使變壓器損耗大大添加，對(duì)變壓器運(yùn)轉(zhuǎn)晦氣。<br /> 《規(guī)程》中規(guī)則了變壓繞組一切分接頭變比實(shí)驗(yàn)的規(guī)范：(1)各相應(yīng)分接頭的變比與值比較，不該有明顯不相同，且應(yīng)契合規(guī)律。(2)電壓35kV以下，變比小于3的變壓器，其變比答應(yīng)差錯(cuò)為±1%;其他一切額外分接頭變比答應(yīng)差錯(cuò)為±0.5%，其他分接頭的變比應(yīng)在變壓器阻抗電壓百分值的1/10以內(nèi)，但不得超越±1%。答應(yīng)差錯(cuò)核算公式為<br /> Δk＝(k-k<sub>N</sub>)／k<sub>N</sub>×100%<br /> 式中 Δk——變比答應(yīng)差錯(cuò)或變比差錯(cuò)；<br /> k——實(shí)測變比；<br /> k<sub>N</sub>——額外變比，即變壓器銘牌上各次繞組額外電壓的比值。<br /> 變壓器變比的丈量應(yīng)在各相一切分接方位進(jìn)行，關(guān)于有載調(diào)壓變壓器，運(yùn)用電動(dòng)設(shè)備調(diào)理分接頭的方位。關(guān)于三繞組變壓器，只需丈量兩對(duì)繞組的變比，通常丈量某一帶分接開關(guān)繞組對(duì)其他；兩邊繞組之間的變比，關(guān)于分接開關(guān)的繞組，應(yīng)丈量一切分接頭方位時(shí)的變比。<br /> 丈質(zhì)變比的常用辦法有雙電壓表法、變比電橋法及運(yùn)用的<strong>變壓器變比測驗(yàn)儀</strong>丈量。<br /> <strong>一、雙電壓表法</strong><br /> 雙電壓表法的原理圖如圖所示<br /> </p><p><img alt="用雙電壓表法丈質(zhì)變比的原理圖" src="http://www.diangon.com/image/portal/201406/05/090318ad1cy5wcs1lwlwcl.jpg" style="height:200px; width:550px" /><br />圖用雙電壓表法丈質(zhì)變比的原理圖<br />(a)直接丈量；(b)經(jīng)過電壓互感器丈量<br />T1--自耦調(diào)壓器；P1、P2--0.2級(jí)電壓表；T2--被試變壓器；<br />TV--0.1級(jí)電壓互感器，通常用2200/220V</p><p> 它是一種比較簡略的變比實(shí)驗(yàn)辦法，所需的實(shí)驗(yàn)設(shè)備都是一些常用的丈量儀器。<br /> 在變壓器一側(cè)加電源（通常為高壓側(cè)），用電壓表（必要時(shí)經(jīng)過電壓比互感器）丈量兩邊電壓，兩邊的電壓讀數(shù)相除即得變比。關(guān)于單相變壓器，能夠直接用單相電源雙電壓法測出變比。關(guān)于三相變壓器，選用三相電源丈量時(shí)，需求三相電源平衡、安穩(wěn)（不平衡不該超越2%），能夠直接測出各變比。變比的核算公式為<br /> k<sub>AB</sub>＝U<sub>AB</sub>／U<sub>ab</sub><br /> k<sub>BC</sub>＝U<sub>BC</sub>／U<sub>bc</sub><br /> k<sub>AC</sub>＝U<sub>AC</sub>／U<sub>ac</sub><br /> 式中 U<sub>AB</sub>、U<sub>BC</sub>、U<sub>AC</sub>——變壓器高壓繞組線間電壓，kV；<br /> U<sub>ab</sub>、U<sub>bc</sub>、U<sub>ac</sub>——低壓繞組線間電壓，kV；<br /> k<sub>AB</sub>、k<sub>BC</sub>、k<sub>AC</sub>——繞組線間變比。<br /> 若現(xiàn)場無平衡、安穩(wěn)的三相電源時(shí)，也可用單相電源丈量三相變壓器的變比。<br /> 依據(jù)變壓器的不相同銜接組別，將單相電源經(jīng)過單相調(diào)壓器接到變壓器的低壓側(cè)，或許將變壓器低壓繞組直接接在比自身額外電壓低的單相電源上，高壓繞組的電壓能夠依據(jù)電壓巨細(xì)直接用電壓表或經(jīng)過電壓互感器丈量，其丈量公式如表所示。</p><p>表、單相電源實(shí)驗(yàn)變比丈量和核算公式</p><table align="center" border="1" cellspacing="0" style="border-collapse:collapse; width:80%"><tbody><tr><td rowspan="2"><p>變壓器接線組別</p></td><td rowspan="2"><p>相別</p></td><td rowspan="2"><p>加壓端子</p></td><td rowspan="2"><p>短路端子</p></td><td colspan="2"><p>測量電壓</p></td><td rowspan="2"><p>變比核算公式</p></td></tr><tr><td><p>高壓側(cè)</p></td><td><p>低壓側(cè)</p></td></tr><tr><td rowspan="3"><p>Yy<br />Dd</p></td><td><p>A</p></td><td><p>ab</p></td><td> </td><td><p>U<sub>AB</sub></p></td><td><p>U<sub>ab</sub></p></td><td><p>k<sub>A</sub>＝U<sub>AB</sub>／U<sub>ab</sub></p></td></tr><tr><td><p>B</p></td><td><p>bc</p></td><td> </td><td><p>U<sub>BC</sub></p></td><td><p>U<sub>bc</sub></p></td><td><p>k<sub>B</sub>＝U<sub>BC</sub>／U<sub>bc</sub></p></td></tr><tr><td><p>C</p></td><td><p>ac</p></td><td> </td><td><p>U<sub>AC</sub></p></td><td><p>U<sub>ac</sub></p></td><td><p>k<sub>C</sub>＝U<sub>AC</sub>／U<sub>ac</sub></p></td></tr><tr><td rowspan="3"><p>YNd<br />例如YNd11</p></td><td><p>A</p></td><td><p>ab</p></td><td> 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