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style="padding: 0px; margin: 0px; font-size: 14px; font-family: 宋體, Arial, sans-serif; color: rgb(0, 0, 0); text-align: center;"> </p><p style="padding: 0px; margin: 0px; font-size: 14px; font-family: 宋體, Arial, sans-serif; color: rgb(0, 0, 0); text-align: center;">三相繼電保護測試儀基本概念</p><p style="padding: 0px; margin: 0px; font-size: 14px; font-family: 宋體, Arial, sans-serif; color: rgb(0, 0, 0);">10．1．1．電壓電流怎樣配合輸出</p><p style="padding: 0px; margin: 0px; font-size: 14px; font-family: 宋體, Arial, sans-serif; color: rgb(0, 0, 0);">如果采用三相電壓同時輸出，則試驗時可任意取其中一相電流輸出。</p><p style="padding: 0px; margin: 0px; font-size: 14px; font-family: 宋體, Arial, sans-serif; color: rgb(0, 0, 0);">如果采用兩相電壓輸出，則需要通過閱讀保護說明書，查看保護是采用什么接線方式。比如，采用“90°接線”，則按“UAB，IC”，“UBC，IA”，“UCA，IB”方式進行輸出；采用“0°接線”，常常按“UAB，IA”，“UBC，IB”，“UCA，IC”方式進行輸出。</p><p style="padding: 0px; margin: 0px; font-size: 14px; font-family: 宋體, Arial, sans-serif; color: rgb(0, 0, 0);">10．1．2．如何輸出復合電壓</p><p style="padding: 0px; margin: 0px; font-size: 14px; font-family: 宋體, Arial, sans-serif; color: rgb(0, 0, 0);">一般，復合電壓是指低電壓（正序電壓）和負序電壓。三相繼電保護測試儀在閉鎖過流時，這兩種電壓是“或”的關系。也就是說，可以理解為是“低電壓閉鎖（方向）過流”和“負序電壓閉鎖（方向）過流”兩套保護的組合。一般保護提供了兩組電壓輸入端子，一組用于輸入低電壓（正序電壓），一組用于輸入負序電壓，因此，試驗時電壓的接線可能不同，注意更換接線。</p><p style="padding: 0px; margin: 0px; font-size: 14px; font-family: 宋體, Arial, sans-serif; color: rgb(0, 0, 0);">在保護定值單中，“低電壓”和“負序電壓”常常指線電壓，可將其除以1.732，轉(zhuǎn)換成相電壓，由測試儀輸出三相電壓進行試驗。</p><p style="padding: 0px; margin: 0px; font-size: 14px; font-family: 宋體, Arial, sans-serif; color: rgb(0, 0, 0);">低電壓試驗時，在“遞變試驗”中一般設置三相電壓相位為：0°、240°、120°；負序電壓試驗時，在“遞變試驗”中一般設置三相電壓相位為：0°、120°、240°。</p><p style="padding: 0px; margin: 0px; font-size: 14px; font-family: 宋體, Arial, sans-serif; color: rgb(0, 0, 0);">10．1．3．怎樣測試方向更簡單</p><p style="padding: 0px; margin: 0px; font-size: 14px; font-family: 宋體, Arial, sans-serif; color: rgb(0, 0, 0);">假設某保護采用90°接線方式，三相繼電保護測試儀低電壓定值為60V，試驗時可在“遞變試驗”中進行如下設置：IA=60V，相位為0°；IB=0V，相位為0°。這樣，UAB即為60V，0°。然后固定電壓，改變電流IC的相位來測試兩條動作邊界。</p><p style="padding: 0px; margin: 0px; font-size: 14px; font-family: 宋體, Arial, sans-serif; color: rgb(0, 0, 0);">10．1．4．*大靈敏角的“正”、“負”是怎樣定義的</p><p style="padding: 0px; margin: 0px; font-size: 14px; font-family: 宋體, Arial, sans-serif; color: rgb(0, 0, 0);">一般，保護定義：電壓超前電流的角度為正，反之為負。</p><p style="padding: 0px; margin: 0px; font-size: 14px; font-family: 宋體, Arial, sans-serif; color: rgb(0, 0, 0);"><img alt="" src="http://img68.chem17.com/9/20191129/637106162233157678537.png" style="height:465px; width:585px" /></p><p style="padding: 0px; margin: 0px; font-size: 14px; font-family: 宋體, Arial, sans-serif; color: rgb(0, 0, 0);">10．2．試驗步驟</p><p style="padding: 0px; margin: 0px; font-size: 14px; font-family: 宋體, Arial, sans-serif; color: rgb(0, 0, 0);">10．2．1．試驗前的準備</p><p style="padding: 0px; margin: 0px; font-size: 14px; font-family: 宋體, Arial, sans-serif; color: rgb(0, 0, 0);">為論述方便，假設某保護的定值為：過流：；低電壓閉鎖值：60V；負序電壓：6V。</p><p style="padding: 0px; margin: 0px; font-size: 14px; font-family: 宋體, Arial, sans-serif; color: rgb(0, 0, 0);">1、接線正確：測試儀三相電壓UA、UB、UC應分別接保護三相電壓的輸入端；測試儀的IA接保護某一相電流的輸入端，比如A相；測試儀的開入量端子TA和公共端 TN 應分別接至保護跳閘接點的兩端，保護為有源接點時，還應保證測試儀的公共端 TN 接保護的正電源端。值得注意的是，有的保護的負序電壓和低電壓由不同的電壓端子接入，因此，在進行下面“檢驗閉鎖電壓值”和“檢驗負序電壓值”測試時應分別接線。</p><p style="padding: 0px; margin: 0px; font-size: 14px; font-family: 宋體, Arial, sans-serif; color: rgb(0, 0, 0);">2、請檢查保護的定值中，復合電壓閉鎖過流功能應投入。如果測試時是讓保護的II段過流保護動作，則至少應保證II段過流的復合電壓閉鎖過流功能應投入。</p><p style="padding: 0px; margin: 0px; font-size: 14px; font-family: 宋體, Arial, sans-serif; color: rgb(0, 0, 0);">10．2．2．檢驗閉鎖情況</p><p style="padding: 0px; margin: 0px; font-size: 14px; font-family: 宋體, Arial, sans-serif; color: rgb(0, 0, 0);">由測試儀輸出線電壓70V（單相電壓為40.4V，三相電壓UA、UB、UC的相位分別為0º、240º、120º ），大于閉鎖電壓60V，保護處于閉鎖狀態(tài)。由測試儀輸出相電流，初始值為3A，步長為0.1A，逐步增大相電流值至7A，檢驗保護應不動作。</p><p style="padding: 0px; margin: 0px; font-size: 14px; font-family: 宋體, Arial, sans-serif; color: rgb(0, 0, 0);">10．2．3．檢驗過流定值</p><p style="padding: 0px; margin: 0px; font-size: 14px; font-family: 宋體, Arial, sans-serif; color: rgb(0, 0, 0);">由測試儀輸出線電壓50V（單相電壓為28.8V，三相電壓UA、UB、UC的相位分別為0º、240º、120º ），小于閉鎖電壓60V，保護閉鎖解除，允許動作。由測試儀輸出相電流，初始值為3A，步長為0.1A，逐步增大相電流至保護動作，測得保護動作電流，與保護整定的過流定值進行比較。</p> <div id="yq00aqiue" class="clear"></div> </div> <div id="yq00aqiue" class="article"> <p>上一篇：<a href="/Article-2049404.html">HY702 三相微機繼電保護測試儀設計原理</a></p> <p>下一篇：<a href="/Article-2049376.html">直流電阻快速測試儀測量標準</a></p> </div> <div id="yq00aqiue" class="clear"></div> </div> </div> <div id="yq00aqiue" class="n-9"> <div id="yq00aqiue" class="c-right"> <div id="yq00aqiue" class="c-1 r-pro"> <div id="yq00aqiue" class="c-left"> <div id="yq00aqiue" class="h-2"><a href="/products.html">產(chǎn)品分類</a></div> <ul> <li><a href="/ParentList-1388067.html" onmouseover="showsubmenu('大電流發(fā)生器')" class="yj">大電流發(fā)生器</a> <div class="yq00aqiue" id="submenu_大電流發(fā)生器" style="display:none"> <ul> </ul> </div> </li> <li><a href="/ParentList-1384344.html" onmouseover="showsubmenu('LCR數(shù)字電橋')" class="yj">LCR數(shù)字電橋</a> <div class="yq00aqiue" 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三相短路平口接地線</a></li> <li><a href="/SonList-1355934.html">> 平口短路接地線</a></li> <li><a href="/SonList-1355932.html">> 高壓平口短路接地線</a></li> </ul> </div> </li> <li><a href="/ParentList-1331761.html" onmouseover="showsubmenu('絕緣電阻接地防雷測試儀')" class="yj">絕緣電阻接地防雷測試儀</a> <div class="yq00aqiue" id="submenu_絕緣電阻接地防雷測試儀" style="display:none"> <ul> <li><a href="/SonList-1331764.html">> 絕緣電阻測試儀類</a></li> <li><a href="/SonList-1331763.html">> 接地防雷測試儀類</a></li> <li><a href="/SonList-1331762.html">> 其它產(chǎn)品類</a></li> </ul> </div> </li> <li><a href="/ParentList-1327095.html" onmouseover="showsubmenu('相位伏安表')" class="yj">相位伏安表</a> <div class="yq00aqiue" id="submenu_相位伏安表" style="display:none"> <ul> <li><a href="/SonList-1327110.html">> 相位伏安表</a></li> <li><a href="/SonList-1327109.html">> 電參數(shù)測試</a></li> <li><a href="/SonList-1327108.html">> 用電檢查儀</a></li> <li><a href="/SonList-1327107.html">> 現(xiàn)場校驗儀</a></li> <li><a href="/SonList-1327106.html">> 終端測試儀</a></li> <li><a href="/SonList-1327104.html">> 標準電能表</a></li> <li><a href="/SonList-1327103.html">> 便攜式裝置</a></li> <li><a href="/SonList-1327102.html">> 電能表裝置</a></li> <li><a href="/SonList-1327101.html">> 數(shù)字表裝置</a></li> <li><a href="/SonList-1327100.html">> 互感器裝置</a></li> <li><a href="/SonList-1327099.html">> 電測量器材</a></li> <li><a href="/SonList-1327097.html">> 附件和配件</a></li> <li><a href="/SonList-1327096.html">> 研發(fā)訂制產(chǎn)品</a></li> </ul> </div> </li> <li><a href="/ParentList-1354476.html" onmouseover="showsubmenu('測試夾')" class="yj">測試夾</a> <div class="yq00aqiue" id="submenu_測試夾" style="display:none"> <ul> <li><a href="/SonList-1354488.html">> ZCQ系列電力測試鉗</a></li> <li><a href="/SonList-1354486.html">> 電力測試導線</a></li> <li><a href="/SonList-1354485.html">> JXZ系列接線柱（插座）</a></li> <li><a href="/SonList-1354483.html">> 測試夾</a></li> <li><a href="/SonList-1354481.html">> 高壓硅膠絕緣試驗電纜</a></li> <li><a href="/SonList-1354480.html">> 接線柱</a></li> <li><a href="/SonList-1354479.html">> 測試電力導線包</a></li> </ul> </div> </li> <li><a 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