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等一系列<strong>接地電阻測試儀</strong>。使用接地?fù)u表是將接地線從桿塔下部接地樁解開及打輔助接地極，使被測的接地極從接地系統(tǒng)中分離，然后將電壓極及電流極按規(guī)定的距離打入土壤中作為輔助電極才能進行測量，且所測接地電阻僅為桿塔接地裝置本身的接地電阻。</span></p><p><span style="color:rgb(63, 63, 63); font-size:16px"><span style="font-family:微軟雅黑,microsoft yahei">當(dāng)使用</span></span><span style="font-size:16px"><span style="font-family:微軟雅黑,microsoft yahei">ETCR2000系列鉗形表</span></span><span style="color:rgb(63, 63, 63); font-size:16px"><span style="font-family:微軟雅黑,microsoft yahei">( 以下簡稱鉗形表) 進行測試時，對于有雙接地引下線的線路桿塔，連通圖如圖1，該法實際上測量的是回路的導(dǎo)通電阻。</span><span style="font-family:microsoft yahei,微軟雅黑,sans-serif">測試回路導(dǎo)通電阻時，回路中包含有接地網(wǎng)回</span><span style="font-family:microsoft yahei,微軟雅黑,sans-serif">路的導(dǎo)通電阻、接地引下線的電阻、桿塔本身的導(dǎo)通電阻。因而桿塔本身的狀態(tài)也會影響鉗形表的測試結(jié)果。</span><span style="font-family:microsoft yahei,微軟雅黑,sans-serif">需要注意的是，引</span><span style="font-family:microsoft yahei,微軟雅黑,sans-serif">下線與大地的接觸電阻、桿塔本身接地引下線處涂防腐漆等也是影響回路導(dǎo)通電阻的影響因素。</span></span></p><p><br/></p><p><br/></p><p style="text-align:center"><img alt="輸電線路桿塔接地網(wǎng)導(dǎo)通電阻測試圖桿塔接地" src="http://00.rc.xiniu.com/g2/M00/58/D3/CgAGe1pu3YeAML46AABcjI4hgVc650.png" style="height:236px; margin:0px; width:370px"/></p><p style="text-align:center"><span style="color:rgb(63, 63, 63); font-size:16px">圖1 輸電線路桿塔接地網(wǎng)導(dǎo)通電阻測試圖</span></p><p><span style="color:rgb(63, 63, 63); font-size:16px">若2 根引下線有1 根斷開或者是單接地引下線<span style="font-family:microsoft yahei,微軟雅黑,sans-serif">的線路桿塔，則引下線可以通過避雷線和其他桿塔地網(wǎng)與本塔地網(wǎng)構(gòu)成回路，此時測量的是接地電阻。如圖2。</span></span></p><p style="text-align:center"><span style="color:rgb(63, 63, 63); font-family:microsoft yahei,微軟雅黑,sans-serif; font-size:16px"><img alt="輸電線路接地電阻測試原理圖" src="http://00.rc.xiniu.com/g2/M00/58/D3/CgAGe1pu3hKAZZeMAABwLrVk-Sk545.png" style="height:239px; margin:0px; width:473px"/></span></p><p style="text-align:center"><span style="color:rgb(63, 63, 63); font-family:microsoft yahei,微軟雅黑,sans-serif; font-size:16px">圖2 輸電線路接地電阻測試原理圖</span></p><p style="text-align:center"><span style="color:rgb(63, 63, 63); font-family:microsoft yahei,微軟雅黑,sans-serif; font-size:16px"><img alt="鉗形表測量線路桿塔接地電阻等值電路圖" src="http://00.rc.xiniu.com/g2/M00/58/D4/CgAGe1pu3mqAIjrwAABcaBd-ZR0178.png" style="height:157px; margin:0px; width:473px"/></span></p><p style="text-align:center"><span style="color:rgb(63, 63, 63); font-family:microsoft yahei,微軟雅黑,sans-serif; font-size:16px">圖3 鉗形表測量線路桿塔接地電阻等值電路圖</span></p><p><span style="color:rgb(63, 63, 63); font-family:microsoft yahei,微軟雅黑,sans-serif; font-size:16px">圖3則為利用鉗形表測量輸電線路桿塔接地阻抗其中R1+jXg 為欲測桿塔的接地阻抗。在接地電阻的測試回路中，還包含有避雷器阻抗( Z = R+jX) 和桿塔之間電阻的互阻抗( 在接地回路正常的情況下很小) 以及其它桿塔的接地電阻并聯(lián)后的等效電阻。根據(jù)鉗形表的測試原理，實際上鉗形表測試出的電阻就是上述4 個數(shù)值的和。所以一般來講，其測試數(shù)值是大于ZC-8 接地?fù)u表數(shù)值的。</span></p><p><br/></p><p><span style="color:rgb(63, 63, 63); font-size:16px">分別用鉗形表和接地?fù)u表對湖南省內(nèi)100多處基<span style="font-family:microsoft yahei,微軟雅黑,sans-serif">涉及不同電壓等級的輸電線路桿塔的接地電阻和接地導(dǎo)通電阻進行了測量，通過大量現(xiàn)場試驗發(fā)現(xiàn): 鉗形表測量的接地電阻一般較接地?fù)u表測量結(jié)果偏大，誤差一般小于1 Ω。而鉗形表的導(dǎo)通電阻測量結(jié)果為接地?fù)u表的8 ～ 10 倍。從2 種測試儀器的測試數(shù)據(jù)來看: 鉗形表測量的導(dǎo)通電阻包含有接地網(wǎng)回路的導(dǎo)通電阻、接地引下線的電阻、桿塔本身的導(dǎo)通電阻。而接地?fù)u表僅測試部分引下線和接地網(wǎng)回路的導(dǎo)通電阻值。因而鉗形表測試數(shù)據(jù)遠(yuǎn)較接地?fù)u表測試導(dǎo)通電阻大，但是更為實用。</span></span></p><p><br/></p><p><span style="color:rgb(63, 63, 63); font-size:16px">通過大量現(xiàn)場試驗發(fā)現(xiàn): 在利用鉗形表<span style="font-family:microsoft yahei,微軟雅黑,sans-serif">對輸電線路桿塔地網(wǎng)接地導(dǎo)通進行測量時，只要是針對不同引下線測試桿塔回路導(dǎo)通電阻數(shù)值沒有大的偏差，并且導(dǎo)通電阻值測量值在2 Ω 以下的，桿塔接地網(wǎng)本身導(dǎo)通便不存在銹斷或脫落的情況，只是桿塔接地網(wǎng)有腐蝕而已。圖4為在湖南某電業(yè)局</span><span style="font-family:microsoft yahei,微軟雅黑,sans-serif">進行線路( 220 kV 宗柏線001 號) 導(dǎo)通電阻測試</span><span style="font-family:microsoft yahei,微軟雅黑,sans-serif">時發(fā)現(xiàn)導(dǎo)通電阻嚴(yán)重偏大后現(xiàn)場開挖的圖片，也驗證了利用鉗形表測量輸電線路桿塔導(dǎo)通的有效性及實用性。</span></span></p><p style="text-align:center"><img alt="桿塔接地裝置現(xiàn)場開挖圖" src="http://00.rc.xiniu.com/g2/M00/58/DD/CgAGe1pu5OqASMVWAAJzFMsU5O4757.png" style="height:266px; margin:0px; width:472px"/></p><p style="text-align:center"><span style="color:rgb(63, 63, 63); font-size:16px">圖4 桿塔接地裝置現(xiàn)場開挖圖</span></p><p><span style="color:rgb(63, 63, 63); font-size:16px">對比傳統(tǒng)的<span style="font-family:微軟雅黑,microsoft yahei">接地?fù)u表，</span>鉗形表攜帶方便，操作簡單，讀數(shù)快捷，<span style="font-family:microsoft yahei,微軟雅黑,sans-serif">大大縮短了測試桿塔接地電阻和導(dǎo)通電阻的時間，提高了工作效率。利用鉗形表測量，可對桿塔導(dǎo)通是否存在銹斷或被偷盜的情況作出判斷，為在線監(jiān)測發(fā)展奠定了基礎(chǔ)。</span></span></p><p><img alt="" src="https://img47.chem17.com/gxhpic_22d2937a21/40ae40a7fdb8a92131f06d6719f22892008f26f46cbc8a75ef202dd45416e23ad2d8658ea5beb9b8.png" style="height:489px; margin:0px; width:492px"/></p><p><br/></p><p><br/></p> <div id="ag0icou4w4" class="pagetb"> <p> 上一條：<a href="/Products-32438755.html">DPS8000v數(shù)字核相儀</a></p> <p> 下一條：<a href="/Products-32623595.html">鉗形接地電阻測試儀</a></p> </div> </div> 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