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margin-top: 0px; margin-bottom: 10px; color: rgb(51, 51, 51); font-family: "Helvetica Neue", Helvetica, Arial, sans-serif; background-color: rgb(255, 255, 255); text-indent: 2em;"><span style="font-size: 16px;">使用三相繼電保護(hù)測試儀進(jìn)行交流試驗(yàn)是三相繼電保護(hù)測試儀的常見的試驗(yàn)項(xiàng)目，但是在使用的過程中有很多注意事項(xiàng)，如果使用不當(dāng)則很難達(dá)到儀器應(yīng)有的測試精度，給大家簡單介紹三相繼電保護(hù)測試儀交流試驗(yàn)測試時(shí)，應(yīng)注意事項(xiàng)。在測試常規(guī)繼電器時(shí)，“開關(guān)變位確認(rèn)時(shí)間"應(yīng)設(shè)置得大一點(diǎn)，比如20ms左右。若測試的返回值誤差過大?？赡苁怯捎诶^電器接點(diǎn)抖動(dòng)過大，這時(shí)可以選擇“手動(dòng)"方式來完成。在測試?yán)^電器的動(dòng)作時(shí)間時(shí)。測試儀輸出的交流量應(yīng)大于保護(hù)的啟動(dòng)值。以保證保護(hù)可靠動(dòng)作。</span></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 10px; color: rgb(51, 51, 51); font-family: "Helvetica Neue", Helvetica, Arial, sans-serif; background-color: rgb(255, 255, 255); text-indent: 2em;"><br style="box-sizing: border-box;"/></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 10px; color: rgb(51, 51, 51); font-family: "Helvetica Neue", Helvetica, Arial, sans-serif; background-color: rgb(255, 255, 255); text-indent: 2em;"><span style="font-size: 16px;">三相繼電保護(hù)測試儀在測試多段式過流保護(hù)時(shí)，一般是一段一段地分別進(jìn)行試驗(yàn)，也就是說，做Ⅰ段定值的時(shí)候，把Ⅱ段、Ⅲ段都退出，然后逐步升電流直到保護(hù)動(dòng)作，在這種方式下測出的動(dòng)作時(shí)間往往是不準(zhǔn)確的，測動(dòng)作時(shí)間時(shí)，最好是直接由測試儀輸出1.2倍及以上的整定動(dòng)作值（低電壓保護(hù)為0.8倍及以下）,保證保護(hù)能夠啟動(dòng)動(dòng)作，這樣測出來的動(dòng)作時(shí)間就比較準(zhǔn)確。測試距離保護(hù)時(shí)，短路阻抗在小于整定定值的時(shí)候保護(hù)才會出口。所以一般取定值的0.95倍來做試驗(yàn)?？杀ＷC保護(hù)能夠可靠出口，在模擬接地距離故障的時(shí)候，零序補(bǔ)償系數(shù)一定要設(shè)置正確；</span></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 10px; color: rgb(51, 51, 51); font-family: "Helvetica Neue", Helvetica, Arial, sans-serif; background-color: rgb(255, 255, 255); text-indent: 2em;"><span style="font-size: 16px;">測試低周保護(hù)時(shí)，選擇頻率可變，頻率變化的步長根據(jù)精度的要求來設(shè)置，最好是選擇“自動(dòng)"的方式來完成，因?yàn)榈椭苡衐f/dt的閉鎖值，用手動(dòng)方式的話不好控制，頻率從50開始下降一直降到保護(hù)動(dòng)作為止，需要注意的是，間隔時(shí)間應(yīng)該大于保護(hù)的動(dòng)作時(shí)間。</span></p><p style="box-sizing: border-box; margin-top: 0px; margin-bottom: 10px; color: rgb(51, 51, 51); font-family: "Helvetica Neue", Helvetica, Arial, sans-serif; background-color: rgb(255, 255, 255); text-indent: 2em;"><span style="font-size: 16px;">校驗(yàn)零序電流定值時(shí)，要注意區(qū)分定值單里給出的是3I0的定值，還是I0的定值，如果是I0的定值，在測試模塊的左下角會有顯示；如果是3 I0的定值，則將左下角顯示的I0的值乘3，看是不是和定值一樣，對于距離和零序保護(hù)定值的校驗(yàn)，后面有專門的校驗(yàn)?zāi)K，測試會更方便，關(guān)于這部分軟件已在后面介紹。<br style="box-sizing: border-box;"/></span></p><div><br/></div></div> <div id="nxnzvbt5" class="inside_newsthree"> <p id="newsprev">上一篇：<b class="newsprev"><a href="/Article-3074207.html">接地電阻測試儀的多種接線方法</a></b></p> <p id="newsnext">下一篇：<b class="newsnext"><a href="/Article-3074205.html">無線高壓鉗形電流表【康登電氣】技術(shù)參數(shù)</a></b></p> <span><a 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