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style="font-size:14px">近年來高層建筑、高壓輸電線路特別是電子設(shè)備、計算機(jī)網(wǎng)絡(luò)通訊廣播等遭到雷擊的事故時有發(fā)生造成設(shè)備被毀通訊中斷嚴(yán)重的還引發(fā)火警甚至導(dǎo)致人身傷亡等惡果。</span></p><p><span style="font-size:14px">完善建筑物、構(gòu)筑物的防雷設(shè)施已受到各方關(guān)注和重視。</span></p><p><span style="font-size:14px"><span style="background-color:rgb(255, 255, 255); font-family:tahoma,microsoft yahei,simsun">檢測避雷針、高層建筑物等設(shè)施的接地電阻，接雷后能否順暢導(dǎo)入大地。</span><br /><span style="background-color:rgb(255, 255, 255); font-family:tahoma,microsoft yahei,simsun">防雷接地的測試方法：</span><br /><span style="background-color:rgb(255, 255, 255); font-family:tahoma,microsoft yahei,simsun">1、你先找到防雷接地網(wǎng)的接地引線或等電位聯(lián)接箱，</span><br /><span style="background-color:rgb(255, 255, 255); font-family:tahoma,microsoft yahei,simsun">2、用接地電阻測測試儀測接地電阻（有兩根測試樁0.4M的要插入泥土，一根距測試點20米，一根40米，所以測試點周圍42米范圍內(nèi)要有泥土）</span><br /><span style="background-color:rgb(255, 255, 255); font-family:tahoma,microsoft yahei,simsun">3、接地電阻值越小越好，具體合格值當(dāng)設(shè)計有要求時必需按設(shè)計要求規(guī)定，設(shè)計沒要求時不能大于4歐。</span></span></p><p> </p><h1><span style="font-size:14px">二、<span style="font-size:16px"><strong>如何防雷接地電阻搖測</strong></span></span></h1><p><span style="font-size:14px">1、測量接地電阻值時接線方式的規(guī)定</span></p><p><span style="font-size:14px">儀表上的E端鈕接5m導(dǎo)線、P端鈕接20m線、C端鈕接40m線，導(dǎo)線的另一端分別接被測物接地極E電位探棒P和電流探棒C，且E、P、C應(yīng)保持直線其間距為20m。</span></p><ul><li><span style="font-size:14px">測量大于等于1Q接地電阻時接線圖。</span></li><li><span style="font-size:14px">將儀表上2個E端鈕連結(jié)在一起。</span></li><li><span style="font-size:14px">將儀表上2個E端鈕導(dǎo)線分別連接到被測接地體上，以消除測量時連接導(dǎo)線電阻對測量結(jié)果引入的附加誤差。</span></li></ul><p><span style="font-size:14px">2、操作步驟</span></p><ul><li><span style="font-size:14px">儀表端所有接線應(yīng)正確無誤。</span></li><li><span style="font-size:14px">儀表連線與接地極E、電位探棒P和電流探棒C應(yīng)牢固接觸。</span></li><li><span style="font-size:14px">儀表放置水平后，調(diào)整檢流計的機(jī)械零位歸零。</span></li><li><span style="font-size:14px">將"倍率開關(guān)"置于大倍率逐漸加快搖柄轉(zhuǎn)速使其達(dá)到150r/min。當(dāng)檢流計指針向某一方向偏轉(zhuǎn)時，旋動刻度盤使檢流計指針恢復(fù)到“0點”，此時刻度盤上讀數(shù)乘上倍率檔即為被測電阻值。</span></li><li><span style="font-size:14px">如果刻度盤讀數(shù)小于1時，檢流計指針仍未取得平衡，可將倍率開關(guān)置于小一檔的倍率，直至調(diào)節(jié)到*平衡為止。</span></li><li><span style="font-size:14px">如果發(fā)現(xiàn)儀表檢流計指針有抖動現(xiàn)象，可變化搖柄轉(zhuǎn)速以消除抖動現(xiàn)象。</span></li></ul><h1><span style="font-size:14px">三、<span style="font-size:16px"><strong>防雷接地測試注意事項</strong></span></span></h1><p><span style="font-size:14px">1、禁止在有雷電或被測物帶電時進(jìn)行測量。</span></p><p><span style="font-size:14px">2、儀表攜帶、使用時須小心輕放，避免劇烈震動</span></p> <div id="f55nvtnxj1n" class="clear"></div> </div> <div id="f55nvtnxj1n" class="article"> <p>上一篇：<a href="/Article-2225464.html">防雷元件測試儀的使用說明</a></p> <p>下一篇：<a href="/Article-2225456.html">HL36型電流互感器工作原理</a></p> </div> <div id="f55nvtnxj1n" class="clear"></div> </div> </div> <div id="f55nvtnxj1n" class="n-9"> <div id="f55nvtnxj1n" class="c-right"> <div 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