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style="text-align:center"><img alt="" src="http://img69.chem17.com/9/20190531/636948866544634695111.jpg" style="height:1229px; width:1000px" /></p><p>2、三線法</p><p>條件：必須有兩個(gè)接地棒：一個(gè)輔助地和一個(gè)探測電極。各個(gè)接地電極間的距離不小于20米。</p><p>原理是在輔助地和被測地之間加上電流,測量被測地和探測電極間的電壓降，測量結(jié)果包括測量電纜本身的電阻。</p><p>適用于：地基接地，建筑工地接地和防雷球型避雷針QPZ 接地。</p><p>接線：S接探測電極，H接輔助地，E和ES連接后接被測地。</p><p>3、四線法</p><p>基本上同三線法,在低接地電阻測量和消除測量電纜電阻對測量結(jié)果的影響時(shí)替代三線法,測量時(shí)E和ES必須單獨(dú)直接連接到被測地。該方法是所有接地電阻測量方法中準(zhǔn)確度高的。</p><p>4、單鉗測量</p><p>測量多點(diǎn)接地中的每個(gè)接地點(diǎn)的接地電阻，而且不能斷開接地連接防止發(fā)生危險(xiǎn)。</p><p>適用于：多點(diǎn)接地，不能斷開連接，測量每個(gè)接地點(diǎn)的電阻。</p><p>接線：用電流鉗監(jiān)測被測接地點(diǎn)上的電流。</p><p>5、雙鉗法</p><p>條件：多點(diǎn)接地，不打輔助地樁，測量單個(gè)接地。</p><p>接線：使用廠商的電流鉗接到相應(yīng)的插口上，將兩鉗卡在接地導(dǎo)體上，兩鉗間的距離要大于0.25米</p> <div id="661161111" class="clear"></div> </div> <div id="661161111" class="article"> <p>上一篇：<a href="/Article-1854828.html">高壓交流驗(yàn)電器【上?？档请姎饪萍加邢薰尽?/a></p> <p>下一篇：<a href="/Article-1850551.html">KD-3A直流電阻快速測試儀的五大優(yōu)勢</a></p> 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