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class="inside_rnewtime">點(diǎn)擊次數(shù)：2512 更新時(shí)間：2023-12-09</div> <div id="pvhr3jx3r5" class="inside_rnewcon"><h2 style="margin: 10px 0px; padding: 0px 0px 10px; font-size: 16px; line-height: 20px; letter-spacing: 1px; clear: both; border-bottom: 1px solid rgb(221, 221, 221); text-indent: 10px; font-family: "Microsoft YaHei"; white-space: normal; background-color: rgb(255, 255, 255);"><span style="font-size: 16px;">手搖兆歐表測(cè)電纜絕緣電阻的方法</span></h2><p style="margin-top: 0px; margin-right: 5px; margin-bottom: 0px; padding: 0px 0px 5px; line-height: 30px; overflow: hidden; text-align: justify; word-wrap: break-word; color: rgb(34, 34, 34); font-family: "Microsoft YaHei"; white-space: normal; background-color: rgb(255, 255, 255);"><span style="font-size: 16px;"><strong>1、準(zhǔn)備工作</strong></span></p><p style="margin-top: 0px; margin-right: 5px; margin-bottom: 0px; padding: 0px 0px 5px; line-height: 30px; overflow: hidden; text-align: justify; word-wrap: break-word; color: rgb(34, 34, 34); font-family: "Microsoft YaHei"; white-space: normal; background-color: rgb(255, 255, 255);"><span style="font-size: 16px;">（1）測(cè)量10kV電力電纜的絕緣電阻，需要選擇2500V兆歐表（帶有測(cè)試線）。測(cè)量前，對(duì)兆歐表進(jìn)行檢查，觀察指針是否正常，線夾引線與線夾端子連接是否良好，測(cè)量導(dǎo)線應(yīng)用帶有屏蔽層的絕緣導(dǎo)線。</span></p><p style="margin-top: 0px; margin-right: 5px; margin-bottom: 0px; padding: 0px 0px 5px; line-height: 30px; overflow: hidden; text-align: justify; word-wrap: break-word; color: rgb(34, 34, 34); font-family: "Microsoft YaHei"; white-space: normal; background-color: rgb(255, 255, 255);"><span style="font-size: 16px;">（2）準(zhǔn)備好接地棒，隨時(shí)準(zhǔn)備放電。電力電纜斷電后，先對(duì)其進(jìn)行放電操作，然后開始測(cè)量。</span></p><p style="margin-top: 0px; margin-right: 5px; margin-bottom: 0px; padding: 0px 0px 5px; line-height: 30px; overflow: hidden; text-align: justify; word-wrap: break-word; color: rgb(34, 34, 34); font-family: "Microsoft YaHei"; white-space: normal; background-color: rgb(255, 255, 255);"><span style="font-size: 16px;">（3）檢查電力電纜上的標(biāo)示，例如型號(hào)中的額定絕緣電壓與搖表的電壓等級(jí)是否相符合，對(duì)其測(cè)量時(shí)，需要了解設(shè)備的絕緣數(shù)值范圍。</span></p><p style="margin-top: 0px; margin-right: 5px; margin-bottom: 0px; padding: 0px 0px 5px; line-height: 30px; overflow: hidden; text-align: justify; word-wrap: break-word; color: rgb(34, 34, 34); font-family: "Microsoft YaHei"; white-space: normal; background-color: rgb(255, 255, 255);"><span style="font-size: 16px;">（4）用干燥清潔的軟布，擦凈電纜線芯附近的污垢。</span></p><p style="margin-top: 0px; margin-right: 5px; margin-bottom: 0px; padding: 0px 0px 5px; line-height: 30px; overflow: hidden; text-align: justify; word-wrap: break-word; color: rgb(34, 34, 34); font-family: "Microsoft YaHei"; white-space: normal; background-color: rgb(255, 255, 255);"><span style="font-size: 16px;">（5）開始測(cè)量前，用繩索將所測(cè)電纜頭吊起1.5m左右，電纜另一頭也要朝上，最好豎起來，避免電纜頭碰在墻上接地，并且需要有專門負(fù)責(zé)看護(hù)的人員。</span></p><p style="margin-top: 0px; margin-right: 5px; margin-bottom: 0px; padding: 0px 0px 5px; line-height: 30px; overflow: hidden; text-align: justify; word-wrap: break-word; color: rgb(34, 34, 34); font-family: "Microsoft YaHei"; white-space: normal; background-color: rgb(255, 255, 255);"><strong><span style="font-size: 16px;">2、</span><span style="font-size: 16px; letter-spacing: 1px; text-indent: 10px;">手搖兆歐表</span><span style="font-size: 16px;">測(cè)試過程</span></strong></p><p style="margin-top: 0px; margin-right: 5px; margin-bottom: 0px; padding: 0px 0px 5px; line-height: 30px; overflow: hidden; text-align: justify; word-wrap: break-word; color: rgb(34, 34, 34); font-family: "Microsoft YaHei"; white-space: normal; background-color: rgb(255, 255, 255);"><span style="font-size: 16px;">測(cè)試項(xiàng)目主要是相間及對(duì)地的絕緣電阻值，即U-V、W、地；V-U、W、地；W-U、V、地，共三次。</span></p><p style="margin-top: 0px; margin-right: 5px; margin-bottom: 0px; padding: 0px 0px 5px; line-height: 30px; overflow: hidden; text-align: justify; word-wrap: break-word; color: rgb(34, 34, 34); font-family: "Microsoft YaHei"; white-space: normal; background-color: rgb(255, 255, 255);"><span style="font-size: 16px;">（1）按要求進(jìn)行接線，確保正確無誤。如搖測(cè)相對(duì)地的絕緣電阻，將被測(cè)相加屏蔽接于兆歐表的G端子上；將非被測(cè)相的兩線芯連接再與電纜金屬外皮相連接后共同接地，同時(shí)把共同接地的導(dǎo)線接在兆歐表E端子上；將一根測(cè)試線接在兆歐表的L端子上，該測(cè)試線(L線)另一端此時(shí)不接線芯，如下圖。</span></p><p style="margin-top: 0px; margin-right: 5px; margin-bottom: 0px; padding: 0px 0px 5px; line-height: 30px; overflow: hidden; text-align: justify; word-wrap: break-word; color: rgb(34, 34, 34); font-family: "Microsoft YaHei"; white-space: normal; background-color: rgb(255, 255, 255);"><span style="font-size: 16px;"> </span></p><p style="text-align: center"><img style="max-width: 800px; max-height: 300%; width: 485px; height: 647px;" src="https://img60.chem17.com/9/20231209/638377058073282537590.jpg" title="b17255888451c322b01ddb404bb7950.jpg" alt="b17255888451c322b01ddb404bb7950.jpg" width="485" height="647"/></p><p style="margin-top: 0px; margin-right: 5px; margin-bottom: 0px; padding: 0px 0px 5px; line-height: 30px; overflow: hidden; text-align: justify; word-wrap: break-word; color: rgb(34, 34, 34); font-family: "Microsoft YaHei"; white-space: normal; background-color: rgb(255, 255, 255);"><span style="font-size: 16px;"></span><br/></p><p style="text-align:center"><img src="https://img60.chem17.com/9/20231209/638377057234800353365.png" alt="Y2N9R[{{B8E[@H{48ZEK@)R.png" width="675" height="284" style="border: 0px none; display: block; margin: 0px auto; width: 675px; height: 284px;" border="0" vspace="0" title="Y2N9R[{{B8E[@H{48ZEK@)R.png"/></p><p style="margin-top: 0px; margin-right: 5px; margin-bottom: 0px; padding: 0px 0px 5px; line-height: 30px; overflow: hidden; text-align: justify; word-wrap: break-word; color: rgb(34, 34, 34); font-family: "Microsoft YaHei"; white-space: normal; background-color: rgb(255, 255, 255);"><span style="font-size: 16px;">圖1：兆歐表測(cè)試電力電纜絕緣電阻的接線示意圖</span></p><p style="margin-top: 0px; margin-right: 5px; margin-bottom: 0px; padding: 0px 0px 5px; line-height: 30px; overflow: hidden; text-align: justify; word-wrap: break-word; color: rgb(34, 34, 34); font-family: "Microsoft YaHei"; white-space: normal; background-color: rgb(255, 255, 255);"><span style="font-size: 16px;">（2）一人戴絕緣手套并用手握住L測(cè)試線的絕緣部分，另一人轉(zhuǎn)動(dòng)兆歐表手柄使發(fā)電機(jī)轉(zhuǎn)速達(dá)120r/min，將L線與線芯接觸，待1min后（指針穩(wěn)定后），記錄其絕緣電阻值。</span></p><p style="margin-top: 0px; margin-right: 5px; margin-bottom: 0px; padding: 0px 0px 5px; line-height: 30px; overflow: hidden; text-align: justify; word-wrap: break-word; color: rgb(34, 34, 34); font-family: "Microsoft YaHei"; white-space: normal; background-color: rgb(255, 255, 255);"><span style="font-size: 16px;">（3）將L線撤離線芯，停止轉(zhuǎn)動(dòng)手柄，然后進(jìn)行放電。放電完畢后，一相電纜芯的測(cè)量已經(jīng)結(jié)束。</span></p><p style="margin-top: 0px; margin-right: 5px; margin-bottom: 0px; padding: 0px 0px 5px; line-height: 30px; overflow: hidden; text-align: justify; word-wrap: break-word; color: rgb(34, 34, 34); font-family: "Microsoft YaHei"; white-space: normal; background-color: rgb(255, 255, 255);"><span style="font-size: 16px;">重復(fù)兩次上述步驟，分別測(cè)量其他兩相電纜芯的絕緣電阻。如果測(cè)量值不在合格的范圍內(nèi)，那么表明所測(cè)電力電纜絕緣電阻不合格；如果三次測(cè)量結(jié)果都在標(biāo)準(zhǔn)范圍內(nèi)，則表明該電力電纜絕緣電阻合格。</span></p><p style="margin-top: 0px; margin-right: 5px; margin-bottom: 0px; padding: 0px 0px 5px; line-height: 30px; overflow: hidden; text-align: justify; word-wrap: break-word; color: rgb(34, 34, 34); font-family: "Microsoft YaHei"; white-space: normal; background-color: rgb(255, 255, 255);"><span style="font-size: 16px;"><strong>判斷電力電纜絕緣電阻是否合格的標(biāo)準(zhǔn)規(guī)定如下：</strong></span></p><p style="margin-top: 0px; margin-right: 5px; margin-bottom: 0px; padding: 0px 0px 5px; line-height: 30px; overflow: hidden; text-align: justify; word-wrap: break-word; color: rgb(34, 34, 34); font-family: "Microsoft YaHei"; white-space: normal; background-color: rgb(255, 255, 255);"><span style="font-size: 16px;">1、長度在500m及以下的10kV電力電纜，用2500V兆歐表搖測(cè)，在電纜溫度為20℃時(shí)，其絕緣電阻值一般不應(yīng)低于400MΩ。</span></p><p style="margin-top: 0px; margin-right: 5px; margin-bottom: 0px; padding: 0px 0px 5px; line-height: 30px; overflow: hidden; text-align: justify; word-wrap: break-word; color: rgb(34, 34, 34); font-family: "Microsoft YaHei"; white-space: normal; background-color: rgb(255, 255, 255);"><span style="font-size: 16px;">2、三相之間，絕緣電阻值應(yīng)幾乎一致；若不一致，則不平衡系數(shù)不得大于2.5。</span></p><p style="margin-top: 0px; margin-right: 5px; margin-bottom: 0px; padding: 0px 0px 5px; line-height: 30px; overflow: hidden; text-align: justify; word-wrap: break-word; color: rgb(34, 34, 34); font-family: "Microsoft YaHei"; white-space: normal; background-color: rgb(255, 255, 255);"><span style="font-size: 16px;">3、本次測(cè)量值與上次測(cè)量的數(shù)值，換算到同一溫度下，其值不得下降30%以上。</span></p><p><br/></p></div> <div id="pvhr3jx3r5" class="inside_newsthree"> <p id="newsprev">上一篇：<b class="newsprev"><a 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