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href="/SonList-1408386.html" title="壓敏電阻測試儀">壓敏電阻測試儀</a></li> </div> </ul> </ul> </div> <div id="5hlvxzllpl3" class="page-right"> <div id="5hlvxzllpl3" class="onurl"> <a href="/"><img src="/Skins/333987/images/home.png"></a><a href="/">網(wǎng)站首頁</a>><a href="/article.html">技術(shù)文章</a> > ETCR3000B三線測試接地電阻測量原理使用方法</div> <div id="5hlvxzllpl3" class="page-news"> <div id="5hlvxzllpl3" class="newshowheader"> <h1 class="nd_title">ETCR3000B三線測試接地電阻測量原理使用方法</h1> <div id="5hlvxzllpl3" class="article-info"> <span> 瀏覽：</span> 3708<span id="5hlvxzllpl3" class="split">|</span> <span id="publishtime">更新時間：2020-10-18</span> <span id="5hlvxzllpl3" class="split">|</span> </div> </div> <div id="5hlvxzllpl3" class="page-newshow"> <p style="padding: 0.5em 0px; margin: 0px; font-size: 14px; color: rgb(102, 102, 102); line-height: 24px; font-family: "Microsoft YaHei", STXihei, sans-serif, Verdana;"><span style="font-size:16px"><strong><span style="font-family:黑體">ETCR3000B</span><span style="font-family:黑體">接地電阻.土壤電阻率測試儀</span></strong><span style="font-family:宋體">由主機、監(jiān)控軟件、測試線、輔助接地棒、通訊線等組成。專為現(xiàn)場測量接地電阻、土壤電阻率、接地電壓、交流電壓而精心設(shè)計制造的，采用數(shù)字及微處理技術(shù)，精密4線法、3線法和簡易2線法測量接地電阻，導(dǎo)入</span><span style="font-family:黑體">FFT</span><span style="font-family:宋體">(</span><span style="font-family:宋體">快速傅立葉變換)技術(shù)、</span><span style="font-family:黑體">AFC</span><span style="font-family:宋體">(</span><span style="font-family:宋體">自動頻率控制)技術(shù)，</span><span style="font-family:宋體">自動識別干擾并選擇測量頻率，使干擾的影響<span style="color:#000000"><span id="5hlvxzllpl3" class="bjFfcClass"></span></span></span>小化，提供更加準確的接地電阻值。<span style="font-family:宋體">具有*的抗干擾能力和環(huán)境適應(yīng)能力，重復(fù)測試一致性好，確保長年測量的高精度、高穩(wěn)定性和高可靠性。其廣泛應(yīng)用于電力、電信、氣象、油田、建筑、防雷及工業(yè)電氣設(shè)備等的接地電阻、土壤電阻率、接地電壓、交流電壓測量。</span></span></p><p style="padding: 0.5em 0px; margin: 0px; font-size: 14px; color: rgb(102, 102, 102); line-height: 24px; font-family: "Microsoft YaHei", STXihei, sans-serif, Verdana;"><span style="font-size:16px"><span style="font-family:宋體">測量原理</span></span></p><p style="padding: 0.5em 0px; margin: 0px; font-size: 14px; color: rgb(102, 102, 102); line-height: 24px; font-family: "Microsoft YaHei", STXihei, sans-serif, Verdana;"><span style="font-size:16px"><strong><span style="font-family:黑體">1</span></strong><span style="font-family:黑體">．</span><span style="font-family:宋體">對地電壓測量采用平均值整流法。</span></span></p><p style="padding: 0.5em 0px; margin: 0px; font-size: 14px; color: rgb(102, 102, 102); line-height: 24px; font-family: "Microsoft YaHei", STXihei, sans-serif, Verdana;"><span style="font-size:16px"><strong><span style="font-family:黑體">2</span></strong><span style="font-family:黑體">．</span><span style="font-family:宋體">接地電阻測量采用額定電流變極法，即在測量對象</span><strong><span style="font-family:黑體">E</span></strong><span style="font-family:黑體">接地極</span><span style="font-family:宋體">和</span><strong><span style="font-family:黑體">C</span></strong><strong><span style="font-family:黑體">(H)</span></strong><span style="font-family:黑體">電流極</span><span style="font-family:宋體">之間流動交流額定電流</span><strong><span style="font-family:黑體">I</span></strong><span style="font-family:宋體">，求取</span><strong><span style="font-family:黑體">E</span></strong><span style="font-family:黑體">接地極</span><span style="font-family:宋體">和</span><strong><span style="font-family:黑體">P</span></strong><strong><span style="font-family:黑體">(S)</span></strong><span style="font-family:黑體">電壓極</span><span style="font-family:宋體">的電位差</span><strong><span style="font-family:黑體">V</span></strong><span style="font-family:宋體">，并根據(jù)公式</span><strong><span style="font-family:黑體">R=V/I</span></strong><span style="font-family:宋體">計算接地電阻值</span><strong><span style="font-family:黑體">R</span></strong><span style="font-family:宋體">。為了保證測試的精度，設(shè)計了四線法，增加</span><strong><span style="font-family:黑體">ES</span></strong><span style="font-family:黑體">輔助地極</span><span style="font-family:宋體">，實際測試時</span><strong><span style="font-family:黑體">ES</span></strong><span style="font-family:宋體">與</span><strong><span style="font-family:黑體">E</span></strong><span style="font-family:宋體">夾在接地體的同一點上。四線法測試能消除被測接地體、輔助接地棒、測試夾、儀表輸入接口表面之間的接觸電阻(通常有污垢或生銹)對測量的影響，能消除線阻對測量的影響，更精密。</span></span></p><p style="padding: 0.5em 0px; margin: 0px; font-size: 14px; color: rgb(102, 102, 102); line-height: 24px; font-family: "Microsoft YaHei", STXihei, sans-serif, Verdana;"><span style="font-size:16px"> <img alt="" src="http://img67.ybzhan.cn/9/20150709/635720317419917380832.png" style="border:0px; height:282px; width:372px" /></span></p><p style="padding: 0.5em 0px; margin: 0px 0px 0px 22.35pt; font-size: 14px; color: rgb(102, 102, 102); line-height: 24px; font-family: "Microsoft YaHei", STXihei, sans-serif, Verdana;"><span style="font-size:16px"><strong><span style="font-family:黑體">3</span></strong><span style="font-family:黑體">．</span><span style="font-family:宋體">其工作誤差(</span><strong><span style="font-family:黑體">B</span></strong><span style="font-family:宋體">)</span><span style="font-family:宋體">是額定工作條件內(nèi)所得誤差，由使用儀表存在的固有誤差(</span><strong><span style="font-family:黑體">A</span></strong><span style="font-family:宋體">)</span><span style="font-family:宋體">和變動誤差(</span><strong><span style="font-family:黑體">Ei</span></strong><span style="font-family:宋體">)</span><span style="font-family:宋體">計算得出。<img alt="" src="http://img66.ybzhan.cn/9/20150709/635720318591884565299.png" style="border:0px; height:50px; width:503px" /></span></span></p><p style="padding: 0.5em 0px; margin: 0px; font-size: 14px; color: rgb(102, 102, 102); line-height: 24px; font-family: "Microsoft YaHei", STXihei, sans-serif, Verdana;"><span style="font-size:16px"><strong><span style="font-family:黑體"> A</span></strong><span style="font-family:宋體">：固有誤差 </span><strong><span style="font-family:黑體">E2</span></strong><span style="font-family:宋體">：電源電壓變化產(chǎn)生的變動</span></span></p><p style="padding: 0.5em 0px; margin: 0px; font-size: 14px; color: rgb(102, 102, 102); line-height: 24px; font-family: "Microsoft YaHei", STXihei, sans-serif, Verdana;"><span style="font-size:16px"><strong><span style="font-family:黑體"> E3</span></strong><span style="font-family:宋體">：溫度變化產(chǎn)生的變動 </span><strong><span style="font-family:黑體">E4</span></strong><span style="font-family:宋體">：干擾電壓變化產(chǎn)生的變動</span></span></p><p style="padding: 0.5em 0px; margin: 0px; font-size: 14px; color: rgb(102, 102, 102); line-height: 24px; font-family: "Microsoft YaHei", STXihei, sans-serif, Verdana;"><span style="font-size:16px"><strong><span style="font-family:黑體"> E5</span></strong><span style="font-family:宋體">：接觸電極電阻產(chǎn)生的變動</span></span></p><p style="padding: 0.5em 0px; margin: 0px; font-size: 14px; color: rgb(102, 102, 102); line-height: 24px; font-family: "Microsoft YaHei", STXihei, sans-serif, Verdana;"><span style="font-size:16px"><strong><span style="font-family:黑體">4</span></strong><span style="font-family:黑體">．</span><span style="font-family:宋體">土壤電阻率(</span><strong><span style="font-family:黑體">ρ</span></strong><span style="font-family:宋體">)</span><span style="font-family:宋體">測量采用4極法(</span><span style="font-family:宋體">溫納法)</span><span style="font-family:宋體">：</span><strong><span style="font-family:黑體">E</span></strong><span style="font-family:黑體">接地極</span><span style="font-family:宋體">與</span><strong><span style="font-family:黑體">C</span></strong><strong><span style="font-family:黑體">(H)</span></strong><span style="font-family:黑體">電流極</span><span style="font-family:宋體">間流動交流電流</span><strong><span style="font-family:黑體">I</span></strong><span style="font-family:宋體">，求</span><strong><span style="font-family:黑體">P</span></strong><strong><span style="font-family:黑體">(S)</span></strong><span style="font-family:黑體">電壓極</span><span style="font-family:宋體">與</span><strong><span style="font-family:黑體">ES</span></strong><span style="font-family:黑體">輔助地極</span><span style="font-family:宋體">間的電位差</span><strong><span style="font-family:黑體">V</span></strong><span style="font-family:宋體">，電位差</span><strong><span style="font-family:黑體">V</span></strong><span style="font-family:宋體">除以交流電流</span><strong><span style="font-family:黑體">I</span></strong><span style="font-family:宋體">得到接地電阻值</span><strong><span style="font-family:黑體">R</span></strong><span style="font-family:宋體">，電極間隔距離為</span><strong><span style="font-family:黑體">a(m)</span></strong><span style="font-family:宋體">,</span><span style="font-family:宋體">根據(jù)公式</span><strong><span style="font-family:黑體">ρ=2πaR(Ωm)</span></strong><span style="font-family:宋體">得出土壤電阻率的值，</span><strong><span style="font-family:黑體">C</span></strong><strong><span style="font-family:黑體">(H)</span></strong><span style="font-family:宋體">-</span><strong><span style="font-family:黑體">P</span></strong><strong><span style="font-family:黑體">(S)</span></strong><span style="font-family:宋體">的間距與</span><strong><span style="font-family:黑體">P</span></strong><strong><span style="font-family:黑體">(S)</span></strong><span style="font-family:宋體">-</span><strong><span style="font-family:黑體">ES</span></strong><span style="font-family:宋體">的間距相等時(都為</span><strong><span style="font-family:黑體">a</span></strong><span style="font-family:宋體">)</span><span style="font-family:宋體">即為溫納法。為了計算方便，請讓電極間距</span><strong><span style="font-family:黑體">a</span></strong><span style="font-family:宋體">遠大于埋設(shè)深度</span><strong><span style="font-family:黑體">h</span></strong><span style="font-family:宋體">,</span><span style="font-family:宋體">一般應(yīng)滿足</span><strong><span style="font-family:黑體">a</span></strong><span style="font-family:宋體">>20</span><strong><span style="font-family:黑體">h</span></strong><span style="font-family:宋體">,</span><span style="font-family:宋體">見下圖。</span></span></p><p style="padding: 0.5em 0px; margin: 0px; font-size: 14px; color: rgb(102, 102, 102); line-height: 24px; font-family: "Microsoft YaHei", STXihei, sans-serif, Verdana;"><span style="font-size:16px"><span style="font-family:宋體"><img alt="" src="http://img67.ybzhan.cn/9/20150709/635720319376453014943.png" style="border:0px; height:324px; width:511px" /></span></span></p><p style="padding: 0.5em 0px; margin: 0px; font-size: 14px; color: rgb(102, 102, 102); line-height: 24px; font-family: "Microsoft YaHei", STXihei, sans-serif, Verdana;"><span style="font-size:16px"><span style="font-family:宋體">使用方法 </span></span></p><p style="padding: 0.5em 0px; margin: 0px; font-size: 14px; color: rgb(102, 102, 102); line-height: 24px; font-family: "Microsoft YaHei", STXihei, sans-serif, Verdana;"><span style="font-size:16px"><strong>1，<span style="font-family:黑體">二線簡易測試接地電阻</span></strong></span></p><p style="padding: 0.5em 0px; margin: 0px; font-size: 14px; color: rgb(102, 102, 102); line-height: 24px; font-family: "Microsoft YaHei", STXihei, sans-serif, Verdana;"><span style="font-size:16px"><span style="font-family:宋體">二線測試：</span><span style="font-family:宋體">此方法是不使用輔助接地棒的簡易測量法，利用現(xiàn)有的接地電阻值<span style="color:#000000"><span id="5hlvxzllpl3" class="bjFfcClass"></span></span></span>小的接地極作為輔助接地極，使用2條簡易測試線連接(即<strong><span style="font-family:黑體">C</span></strong><strong><span style="font-family:黑體">(H)</span></strong><span style="font-family:宋體">-</span><strong><span style="font-family:黑體">P</span></strong><strong><span style="font-family:黑體">(S)</span></strong><span style="font-family:宋體">接口短接、</span><strong><span style="font-family:黑體">E</span></strong><span style="font-family:宋體">-</span><strong><span style="font-family:黑體">ES</span></strong><span style="font-family:宋體">接口短接)?？梢岳媒饘偎?、消防栓等金屬埋設(shè)物、商用電力系統(tǒng)的共同接地或建筑物的防雷接地極等來代替輔助接地棒</span><strong><span style="font-family:黑體">C</span></strong><strong><span style="font-family:黑體">(H)</span></strong><span style="font-family:宋體">、</span><strong><span style="font-family:黑體">P</span></strong><strong><span style="font-family:黑體">(S)</span></strong><span style="font-family:宋體">，測量時注意去除所選金屬輔助接地體連接點的氧化層。接線如下圖，儀表操作同四線測試。</span></span></p><table border="1" cellpadding="0" cellspacing="0" style="border-collapse:collapse; border:currentcolor; font-family:sans-serif,arial,verdana,trebuchet ms; margin-left:14.4pt"><tbody><tr><td rowspan="2" style="padding: 0px; vertical-align: top; width: 36px;"><p style="padding: 0.5em 0px; margin: 0px; font-size: 14px; color: rgb(102, 102, 102); line-height: 24px;"><span style="font-size:16px"><img alt="" src="http://img65.ybzhan.cn/9/20150709/635720323329048234688.png" style="border:0px; height:41px; width:46px" /></span></p></td><td style="padding: 0px; vertical-align: top; width: 336px;"><p style="padding: 0.5em 0px; margin: 0px; font-size: 14px; color: rgb(102, 102, 102); line-height: 24px;"><span style="font-size:16px"><strong><span style="font-family:黑體">選用</span></strong><strong><span style="font-family:黑體">商用電源系統(tǒng)接地作為輔助接地極測量時，必須先確認是商用電源系統(tǒng)的接地極，否則</span></strong><strong><span style="font-family:黑體">斷路器可能啟動，</span></strong><strong><span style="font-family:黑體">有危險。</span></strong></span></p></td></tr><tr><td style="padding: 0px; vertical-align: top; width: 336px;"><p style="padding: 0.5em 0px; margin: 0px; font-size: 14px; color: rgb(102, 102, 102); line-height: 24px;"><span style="font-size:16px"><strong><span style="font-family:黑體">采用簡易</span></strong><strong><span style="font-family:黑體">二線</span></strong><strong><span style="font-family:黑體">法測量接地電阻，盡量選擇</span></strong><strong><span style="font-family:黑體">re</span></strong><strong><span style="font-family:黑體">值小的接地體作為輔助接地極，這樣儀表讀數(shù)才更接近真實值。測量時請優(yōu)先選擇金屬水管、金屬消防栓做為輔助接地極。</span></strong></span></p></td></tr></tbody></table><p style="padding: 0.5em 0px; margin: 0px; font-size: 14px; color: rgb(102, 102, 102); line-height: 24px; font-family: "Microsoft YaHei", STXihei, sans-serif, Verdana;"> </p><p style="padding: 0.5em 0px; margin: 0px; font-size: 14px; color: rgb(102, 102, 102); line-height: 24px; font-family: "Microsoft YaHei", STXihei, sans-serif, Verdana;"><span style="font-size:16px"><img alt="" src="http://img67.ybzhan.cn/9/20150709/635720323998305153978.png" style="border:0px; height:599px; width:629px" /></span></p><p style="padding: 0.5em 0px; margin: 0px; font-size: 14px; color: rgb(102, 102, 102); line-height: 24px; font-family: "Microsoft YaHei", STXihei, sans-serif, Verdana;"><span style="font-size:16px"><span style="font-family:宋體">二線簡易法測量接地電阻，其儀表讀數(shù)為被測接地體的接地電阻值與商用接地體的接地電阻值之和，即：</span></span></p><p style="padding: 0.5em 0px; margin: 0px; font-size: 14px; color: rgb(102, 102, 102); line-height: 24px; font-family: "Microsoft YaHei", STXihei, sans-serif, Verdana;"><span style="font-size:16px"><strong><span style="font-family:黑體">R=RX</span></strong><strong><span style="font-family:黑體">＋re</span></strong></span></p><p style="padding: 0.5em 0px; margin: 0px 0px 0px 17.95pt; font-size: 14px; color: rgb(102, 102, 102); line-height: 24px; font-family: "Microsoft YaHei", STXihei, sans-serif, Verdana;"><span style="font-size:16px"><span style="font-family:宋體">其中：</span><strong><span style="font-family:黑體">R</span></strong><strong><span style="font-family:黑體">——</span></strong><span style="font-family:宋體">為儀表讀數(shù)值；</span></span></p><p style="padding: 0.5em 0px; margin: 0px 0px 0px 17.95pt; font-size: 14px; color: rgb(102, 102, 102); line-height: 24px; font-family: "Microsoft YaHei", STXihei, sans-serif, Verdana;"><span style="font-size:16px"><strong><span style="font-family:黑體">RX</span></strong><strong><span style="font-family:黑體">——</span></strong><span style="font-family:宋體">為被測</span><span style="font-family:宋體">接地體的接地電阻值；</span></span></p><p style="padding: 0.5em 0px; margin: 0px 0px 0px 17.95pt; font-size: 14px; color: rgb(102, 102, 102); line-height: 24px; font-family: "Microsoft YaHei", STXihei, sans-serif, Verdana;"><span style="font-size:16px"><strong><span style="font-family:黑體">re</span></strong><strong><span style="font-family:黑體">——</span></strong><span style="font-family:宋體">為商用電力系統(tǒng)等共同接地體的接地電阻</span><span style="font-family:宋體">值</span><span style="font-family:宋體">。</span></span></p><p style="padding: 0.5em 0px; margin: 0px; font-size: 14px; color: rgb(102, 102, 102); line-height: 24px; font-family: "Microsoft YaHei", STXihei, sans-serif, Verdana;"><span style="font-size:16px"><span style="font-family:宋體">那么，被測</span><span style="font-family:宋體">接地體的接地電阻值為：</span><strong><span style="font-family:黑體">RX=R</span></strong><strong><span style="font-family:黑體">－re</span></strong></span></p><p style="padding: 0.5em 0px; margin: 0px; font-size: 14px; color: rgb(102, 102, 102); line-height: 24px; font-family: "Microsoft YaHei", STXihei, sans-serif, Verdana;"><span style="font-size:16px">2，<strong><span style="font-family:黑體">三線測</span></strong><strong><span style="font-family:黑體">試</span></strong><strong><span style="font-family:黑體">接地電阻</span></strong></span></p><p style="padding: 0.5em 0px; margin: 0px; font-size: 14px; color: rgb(102, 102, 102); line-height: 24px; font-family: "Microsoft YaHei", STXihei, sans-serif, Verdana;"><span style="font-size:16px"><span style="font-family:宋體">三線測試：</span><span style="font-family:宋體">如</span><span style="font-family:宋體">下圖，短接儀表的</span><strong><span style="font-family:黑體">ES</span></strong><span style="font-family:宋體">、</span><strong><span style="font-family:黑體">E</span></strong><span style="font-family:宋體">接口，即為三線測試，儀表操作與四線測試相同。三線測試不能消除線阻對測量的影響，也不能消除儀表與測試線間、測試線與輔助接地棒間接觸電阻變化對測量的影響，</span><span style="font-family:宋體">測量時還需去除被測接地體表面的氧化層</span><span style="font-family:宋體">。</span></span></p><p style="padding: 0.5em 0px; margin: 0px; font-size: 14px; color: rgb(102, 102, 102); line-height: 24px; font-family: "Microsoft YaHei", STXihei, sans-serif, Verdana;"><span style="font-size:16px"><span style="font-family:宋體"><img alt="" src="http://img65.ybzhan.cn/9/20150709/635720326331468446918.png" style="border:0px; height:296px; width:644px" />3，</span><strong><span style="font-family:黑體">四線精密測試接地電</span></strong><strong><span style="font-family:黑體">阻</span></strong></span></p><table border="1" cellpadding="0" cellspacing="0" style="border-collapse:collapse; border:currentcolor; font-family:sans-serif,arial,verdana,trebuchet ms; margin-left:14.4pt"><tbody><tr><td style="padding: 0px; width: 39px;"><p style="padding: 0.5em 0px; margin: 0px; font-size: 14px; color: rgb(102, 102, 102); line-height: 24px; text-align: center;"><span style="font-size:16px">注意</span></p></td><td style="padding: 0px; vertical-align: top; width: 336px;"><p style="padding: 0.5em 0px; margin: 0px; font-size: 14px; color: rgb(102, 102, 102); line-height: 24px;"><span style="font-size:16px"><strong><span style="font-family:黑體">在</span></strong><strong><span style="font-family:黑體">測試</span></strong><strong><span style="font-family:黑體">接地電阻時，先確認接地線的對地電壓值，即C</span></strong><strong><span style="font-family:黑體">(H)</span></strong><strong><span style="font-family:黑體">與E或P</span></strong><strong><span style="font-family:黑體">(S)</span></strong><strong><span style="font-family:黑體">與ES的電壓值必須在20V以下，若對地電壓在5V以上，儀表顯示NOISE符號，則接地電阻的測量值可能會產(chǎn)生誤差，此時先將被測接地體的設(shè)備斷電，使接地電壓下降后再進行接地電阻</span></strong><strong><span style="font-family:黑體">測試</span></strong><strong><span style="font-family:黑體">。</span></strong></span></p></td></tr></tbody></table><p style="padding: 0.5em 0px; margin: 0px; font-size: 14px; color: rgb(102, 102, 102); line-height: 24px; font-family: "Microsoft YaHei", STXihei, sans-serif, Verdana;"><span style="font-size:16px"><span style="font-family:宋體">四線測試：四線法測試能消除被測接地體、輔助接地棒、測試夾、儀表輸入接口表面之間的接觸電阻(通常有污垢或生銹)對測量的影響，能消除線阻對測量的影響，優(yōu)于三線測試。</span></span></p><p style="padding: 0.5em 0px; margin: 0px; font-size: 14px; color: rgb(102, 102, 102); line-height: 24px; font-family: "Microsoft YaHei", STXihei, sans-serif, Verdana;"><span style="font-size:16px"><span style="font-family:宋體">參見下圖：從被測物體開始，一般間隔5m～20m，分別將</span><strong><span style="font-family:黑體">P</span></strong><strong><span style="font-family:黑體">(S)</span></strong><span style="font-family:宋體">、</span><strong><span style="font-family:黑體">C</span></strong><strong><span style="font-family:黑體">(H)</span></strong><span style="font-family:宋體">輔助接地棒呈一直線深埋入大地，將接地測試線(黑、綠、黃、紅)從儀表的</span><strong><span style="font-family:黑體">E</span></strong><strong><span style="font-family:黑體">、ES、P</span></strong><strong><span style="font-family:黑體">(S)</span></strong><span style="font-family:宋體">、</span><strong><span style="font-family:黑體">C</span></strong><strong><span style="font-family:黑體">(H)</span></strong><span style="font-family:宋體">接口開始對應(yīng)連接到被測接地極</span><strong><span style="font-family:黑體">E</span></strong><span style="font-family:宋體">、輔助電壓極</span><strong><span style="font-family:黑體">P</span></strong><strong><span style="font-family:黑體">(S)</span></strong><span style="font-family:宋體">、輔助電流極</span><strong><span style="font-family:黑體">C</span></strong><strong><span style="font-family:黑體">(H)</span></strong><span style="font-family:宋體">上。</span></span></p><table border="1" cellpadding="0" cellspacing="0" style="border-collapse:collapse; border:currentcolor; font-family:sans-serif,arial,verdana,trebuchet ms; margin-left:14.4pt"><tbody><tr><td rowspan="3" style="padding: 0px; width: 39px;"><p style="padding: 0.5em 0px; margin: 0px; font-size: 14px; color: rgb(102, 102, 102); line-height: 24px;"><span style="font-size:16px">注意</span></p></td><td style="padding: 0px; vertical-align: top; width: 336px;"><p style="padding: 0.5em 0px; margin: 0px; font-size: 14px; color: rgb(102, 102, 102); line-height: 24px;"><span style="font-size:16px"><strong><span style="font-family:黑體">被測接地體E到電流極C</span></strong><strong><span style="font-family:黑體">(H)</span></strong><strong><span style="font-family:黑體">之間的距離，應(yīng)至少是被測接地體埋入地下深度(h)的5倍，或者是被測接地體埋入地下電極長度(d)的5倍。</span></strong></span></p></td></tr><tr><td style="padding: 0px; vertical-align: top; width: 336px;"><p style="padding: 0.5em 0px; margin: 0px; font-size: 14px; color: rgb(102, 102, 102); line-height: 24px;"><span style="font-size:16px"><strong><span style="font-family:黑體">測量復(fù)雜接地系統(tǒng)的總接地電阻，其d的距離為該接地系統(tǒng)<span style="color:#000000"><span id="5hlvxzllpl3" class="bjFfcClass"></span></span>大對角線的距離。</span></strong></span></p></td></tr><tr><td style="padding: 0px; vertical-align: top; width: 336px;"><p style="padding: 0.5em 0px; margin: 0px; font-size: 14px; color: rgb(102, 102, 102); line-height: 24px;"><span style="font-size:16px"><strong><span style="font-family:黑體">測試時，測試線不能相互纏繞在一起，否則可能影響測試精度。</span></strong></span></p></td></tr></tbody></table><p style="padding: 0.5em 0px; margin: 0px; font-size: 14px; color: rgb(102, 102, 102); line-height: 24px; font-family: "Microsoft YaHei", STXihei, sans-serif, Verdana;"> </p><p style="padding: 0.5em 0px; margin: 0px; font-size: 14px; color: rgb(102, 102, 102); line-height: 24px; font-family: "Microsoft YaHei", STXihei, sans-serif, Verdana;"><span style="font-size:16px"><img alt="" src="http://img65.ybzhan.cn/9/20150709/635720328475632841831.png" style="border:0px; height:299px; width:608px" /></span></p><p style="padding: 0.5em 0px; margin: 0px; font-size: 14px; color: rgb(102, 102, 102); line-height: 24px; font-family: "Microsoft YaHei", STXihei, sans-serif, Verdana;"><span style="font-size:16px"><span style="font-family:宋體">對于多點獨立接地系統(tǒng)或大地網(wǎng)接地系統(tǒng)，用戶自行選用更長的測試線即可，電極間距大于被測試地網(wǎng)大對角線長的5倍即可。如下圖：</span></span></p><p style="padding: 0.5em 0px; margin: 0px; font-size: 14px; color: rgb(102, 102, 102); line-height: 24px; font-family: "Microsoft YaHei", STXihei, sans-serif, Verdana;"><span style="font-size:16px"><img alt="" src="http://img66.ybzhan.cn/9/20150709/635720328849890263707.png" style="border:0px; height:377px; width:590px" /></span></p><table align="left" cellpadding="0" cellspacing="0" style="border:1px dotted rgb(211, 211, 211); font-family:sans-serif,arial,verdana,trebuchet ms"><tbody><tr><td style="padding: 0px;"> </td></tr><tr><td style="padding: 0px;"> </td><td style="padding: 0px;"> </td></tr></tbody></table><p style="padding: 0.5em 0px; margin: 0px; font-size: 14px; color: rgb(102, 102, 102); line-height: 24px; font-family: "Microsoft YaHei", STXihei, sans-serif, Verdana;"> </p><p style="padding: 0.5em 0px; margin: 0px; font-size: 14px; color: rgb(102, 102, 102); line-height: 24px; font-family: "Microsoft YaHei", STXihei, sans-serif, Verdana;"><span style="font-size:16px"><strong><span style="font-family:黑體">R=r1</span></strong><strong><span style="font-family:黑體">∥r2∥r3∥r4∥r5∥r6∥</span></strong><strong><span style="font-family:宋體">…</span></strong><strong><span style="font-family:黑體">∥rn</span></strong><span style="font-family:宋體">（</span><strong><span style="font-family:黑體">r1</span></strong><span style="font-family:宋體">…</span><strong><span style="font-family:黑體">rn</span></strong><span style="font-family:宋體">都是獨立接地點）</span></span></p><p style="padding: 0.5em 0px; margin: 0px; font-size: 14px; color: rgb(102, 102, 102); line-height: 24px; font-family: "Microsoft YaHei", STXihei, sans-serif, Verdana;"><span style="font-size:16px"><strong><span style="font-family:黑體">R</span></strong><strong><span style="font-family:黑體">——</span></strong><span style="font-family:宋體">儀表讀數(shù)，整個接地系統(tǒng)的總接地電阻值；</span></span></p><p style="padding: 0.5em 0px; margin: 0px; font-size: 14px; color: rgb(102, 102, 102); line-height: 24px; font-family: "Microsoft YaHei", STXihei, sans-serif, Verdana;"><span style="font-size:16px"><strong><span style="font-family:黑體">r1</span></strong><strong><span style="font-family:宋體">…</span></strong><strong><span style="font-family:黑體">rn</span></strong><strong><span style="font-family:黑體">——</span></strong><span style="font-family:宋體">都是獨立接地點，在地面下各接地體沒有連接在一起；</span></span></p><p style="padding: 0.5em 0px; margin: 0px; font-size: 14px; color: rgb(102, 102, 102); line-height: 24px; font-family: "Microsoft YaHei", STXihei, sans-serif, Verdana;"><span style="font-size:16px"><strong><span style="font-family:黑體">rC</span></strong><strong><span style="font-family:黑體">——</span></strong><span style="font-family:宋體">輔助電流極</span><strong><span style="font-family:黑體">C</span></strong><strong><span style="font-family:黑體">(H)</span></strong><span style="font-family:宋體">的對地電阻；</span></span></p><p style="padding: 0.5em 0px; margin: 0px; font-size: 14px; color: rgb(102, 102, 102); line-height: 24px; font-family: "Microsoft YaHei", STXihei, sans-serif, Verdana;"><span style="font-size:16px"><strong><span style="font-family:黑體">rP</span></strong><strong><span style="font-family:黑體">——</span></strong><span style="font-family:宋體">輔助電壓極</span><strong><span style="font-family:黑體">P</span></strong><strong><span style="font-family:黑體">(S)</span></strong><span style="font-family:宋體">的對地電阻；</span></span></p><p style="padding: 0.5em 0px; margin: 0px; font-size: 14px; color: rgb(102, 102, 102); line-height: 24px; font-family: "Microsoft YaHei", STXihei, sans-serif, Verdana;"><span style="font-size:16px"><strong><span style="font-family:宋體">n</span></strong><strong><span style="font-family:宋體">——</span></strong><span style="font-family:宋體">獨立接地點的數(shù)量，點數(shù)越多，</span><strong><span style="font-family:黑體">R</span></strong><span style="font-family:宋體">值越小。</span></span></p><p style="padding: 0.5em 0px; margin: 0px; font-size: 14px; color: rgb(102, 102, 102); line-height: 24px; font-family: "Microsoft YaHei", STXihei, sans-serif, Verdana;"><span style="font-size:16px"><span style="font-family:宋體">連接好測試線后，先將</span><strong><span style="font-family:黑體">FUNCTION</span></strong><span style="font-family:宋體">功能選擇旋鈕旋至</span><span style="font-family:宋體">“</span><strong><span style="font-family:黑體">R</span></strong><strong><span style="font-family:黑體">EARTH</span></strong><span style="font-family:宋體">”位置，進入接地電阻</span><span style="font-family:宋體">測試模式，</span><span style="font-family:宋體">按一下“</span><strong><span style="font-family:黑體">START</span></strong><span style="font-family:宋體">”鍵開始測試，測試過程中有倒計數(shù)指示及測試進度棒圖指示，測試完畢后顯示穩(wěn)定的數(shù)據(jù)，即被測接地體的接地電阻值</span><strong><span style="font-family:黑體">R</span></strong><span style="font-family:宋體">。</span></span></p><p style="padding: 0.5em 0px; margin: 0px; font-size: 14px; color: rgb(102, 102, 102); line-height: 24px; font-family: "Microsoft YaHei", STXihei, sans-serif, Verdana;"><span style="font-size:16px"><span style="font-family:宋體">測試完畢后，再</span><span style="font-family:宋體">按一下“</span><strong><span style="font-family:黑體">SET</span></strong><span style="font-family:宋體">”鍵可以查看輔助電流極</span><strong><span style="font-family:黑體">C</span></strong><strong><span style="font-family:黑體">(H)</span></strong><span style="font-family:宋體">與輔助電壓極</span><strong><span style="font-family:黑體">P</span></strong><strong><span style="font-family:黑體">(S)</span></strong><span style="font-family:宋體">的接地電阻值</span><strong><span style="font-family:黑體">rC</span></strong><span style="font-family:宋體">、</span><strong><span style="font-family:黑體">rP</span></strong><span style="font-family:宋體">，</span><strong><span style="font-family:黑體">rC</span></strong><span style="font-family:宋體">、</span><strong><span style="font-family:黑體">rP</span></strong><span style="font-family:宋體">值顯示完后自動返回顯示被測接地電阻值</span><strong><span style="font-family:黑體">R</span></strong><span style="font-family:宋體">。</span></span></p><p style="padding: 0.5em 0px; margin: 0px; font-size: 14px; color: rgb(102, 102, 102); line-height: 24px; font-family: "Microsoft YaHei", STXihei, sans-serif, Verdana;"><span style="font-size:16px"><span style="font-family:宋體">如下圖，被測試接地電阻值為</span><span style="font-family:宋體">2.05</span><span style="font-family:宋體">Ω，儀表已存8組數(shù)據(jù)；輔助電流極</span><strong><span style="font-family:黑體">C</span></strong><strong><span style="font-family:黑體">(H)</span></strong><span style="font-family:宋體">的接地電阻</span><strong><span style="font-family:黑體">rC</span></strong><span style="font-family:宋體">為0.36KΩ；輔助電壓極</span><strong><span style="font-family:黑體">P</span></strong><strong><span style="font-family:黑體">(S)</span></strong><span style="font-family:宋體">的接地電阻值</span><strong><span style="font-family:黑體">rP</span></strong><span style="font-family:宋體">為0.27KΩ。</span></span></p><p style="padding: 0.5em 0px; margin: 0px; font-size: 14px; color: rgb(102, 102, 102); line-height: 24px; font-family: "Microsoft YaHei", STXihei, sans-serif, Verdana;"><span style="font-size:16px"><span style="font-family:宋體"><img alt="" src="http://img65.ybzhan.cn/9/20150709/635720329292414511130.png" style="border:0px; height:116px; width:635px" />4，</span><strong><span style="font-family:黑體">土壤電阻率測試</span></strong></span></p><p style="padding: 0.5em 0px; margin: 0px; font-size: 14px; color: rgb(102, 102, 102); line-height: 24px; font-family: "Microsoft YaHei", STXihei, sans-serif, Verdana;"><span style="font-size:16px"><span style="font-family:宋體">土壤電阻</span><span style="font-family:宋體">率</span><strong><span style="font-family:黑體">ρ</span></strong><span style="font-family:宋體">是決定接地體接地電阻的重要因數(shù)。不同性質(zhì)的土壤，固然有不同的土壤電阻</span><span style="font-family:宋體">率</span><span style="font-family:宋體">，就是同一種土壤，由于溫度和含水量等不同，土壤電阻</span><span style="font-family:宋體">率</span><span style="font-family:宋體">也會隨之發(fā)生顯著的變化。因此，為了在進行接地裝置設(shè)計時有正確的依據(jù)，使所設(shè)計的接地裝置更能符合實際工作的需要，必須進行土壤電阻</span><span style="font-family:宋體">率</span><span style="font-family:宋體">的測量。</span></span></p><p style="padding: 0.5em 0px; margin: 0px; font-size: 14px; color: rgb(102, 102, 102); line-height: 24px; font-family: "Microsoft YaHei", STXihei, sans-serif, Verdana;"><span style="font-size:16px"><span style="font-family:宋體">土壤電阻率用</span><span style="font-family:宋體">四極法(</span><span style="font-family:宋體">溫納法)進行測量。</span></span></p><p style="padding: 0.5em 0px; margin: 0px; font-size: 14px; color: rgb(102, 102, 102); line-height: 24px; font-family: "Microsoft YaHei", STXihei, sans-serif, Verdana;"><span style="font-size:16px"><span style="font-family:宋體">根據(jù)公式</span><strong><span style="font-family:黑體">ρ=2πaR(Ωm)</span></strong><span style="font-family:宋體">計算土壤電阻率</span><strong><span style="font-family:黑體">ρ</span></strong><span style="font-family:宋體">，單位為</span><strong><span style="font-family:黑體">Ωm</span></strong><span style="font-family:宋體">，</span><span style="font-family:宋體">其中：</span></span></p><p style="padding: 0.5em 0px; margin: 0px; font-size: 14px; color: rgb(102, 102, 102); line-height: 24px; font-family: "Microsoft YaHei", STXihei, sans-serif, Verdana;"><span style="font-size:16px"><strong><span style="font-family:黑體">a</span></strong><span style="font-family:宋體">——電極間距</span></span></p><p style="padding: 0.5em 0px; margin: 0px; font-size: 14px; color: rgb(102, 102, 102); line-height: 24px; font-family: "Microsoft YaHei", STXihei, sans-serif, Verdana;"><span style="font-size:16px"><strong><span style="font-family:黑體">R</span></strong><span style="font-family:宋體">——</span><strong><span style="font-family:黑體">P</span></strong><strong><span style="font-family:黑體">(S)-</span></strong><strong><span style="font-family:黑體">ES</span></strong><span style="font-family:宋體">電極間土壤的電阻</span></span></p><p style="padding: 0.5em 0px; margin: 0px; font-size: 14px; color: rgb(102, 102, 102); line-height: 24px; font-family: "Microsoft YaHei", STXihei, sans-serif, Verdana;"><span style="font-size:16px"><span style="font-family:宋體">四極法(</span><span style="font-family:宋體">溫納法)</span><span style="font-family:宋體">：按下圖連接測試線，注意輔助接地棒間的間距及埋入深度，分別將</span><strong><span style="font-family:黑體">C</span><span style="font-family:黑體">(H)</span><span style="font-family:黑體">、P</span><span style="font-family:黑體">(S)</span><span style="font-family:黑體">、ES</span></strong><span style="font-family:宋體">、</span><strong><span style="font-family:黑體">E</span></strong><span style="font-family:宋體">輔助接地棒呈一直線深埋入大地，將接地測試線(紅、黃、綠、黑)從儀表的</span><strong><span style="font-family:黑體">C</span><span style="font-family:黑體">(H)</span><span style="font-family:黑體">、P</span><span style="font-family:黑體">(S)</span><span style="font-family:黑體">、ES</span></strong><span style="font-family:宋體">、</span><strong><span style="font-family:黑體">E</span></strong><span style="font-family:宋體">接口開始對應(yīng)連接到被測</span><strong><span style="font-family:黑體">C</span><span style="font-family:黑體">(H)</span><span style="font-family:黑體">、P</span><span style="font-family:黑體">(S)</span><span style="font-family:黑體">、ES</span></strong><span style="font-family:宋體">、</span><strong><span style="font-family:黑體">E</span></strong><span style="font-family:宋體">輔助接地棒上。</span></span></p><p style="padding: 0.5em 0px; margin: 0px; font-size: 14px; color: rgb(102, 102, 102); line-height: 24px; font-family: "Microsoft YaHei", STXihei, sans-serif, Verdana;"><span style="font-size:16px"><span style="font-family:宋體"><img alt="" src="http://img66.ybzhan.cn/9/20150709/635720330712436499214.png" style="border:0px; height:256px; width:673px" /></span></span></p><p style="padding: 0.5em 0px; margin: 0px; font-size: 14px; color: rgb(102, 102, 102); line-height: 24px; font-family: "Microsoft YaHei", STXihei, sans-serif, Verdana;"><span style="font-size:16px"><span style="font-family:宋體">輔助接地棒的間距設(shè)</span><span style="font-family:宋體">置：</span><span style="font-family:宋體">連接好測試線后，先將</span><strong><span style="font-family:黑體">FUNCTION</span></strong><span style="font-family:宋體">功能選擇旋鈕旋至</span><span style="font-family:宋體">“</span><strong><span style="font-family:黑體">ρ</span></strong><strong><span style="font-family:黑體">EARTH</span></strong><span style="font-family:宋體">”位置，進入</span><span style="font-family:宋體">土壤電阻率測試模式，長按“</span><strong><span style="font-family:黑體">SET</span></strong><span style="font-family:宋體">”鍵(約3秒)進入輔助接地棒的間距設(shè)</span><span style="font-family:宋體">置</span><span style="font-family:宋體">，短按“</span><strong><span style="font-family:黑體">SET</span></strong><span style="font-family:宋體">”鍵移動光標，按“</span> <strong><span style="font-family:宋體">”</span></strong><span style="font-family:宋體">或“</span> <span style="font-family:宋體">”鍵改變當前數(shù)字大小(</span><strong><span style="font-family:黑體">a</span></strong><span style="font-family:宋體">值</span><span style="font-family:宋體">范圍:1m～100m)，再長按“</span><strong><span style="font-family:黑體">SET</span></strong><span style="font-family:宋體">”鍵保存設(shè)定的</span><strong><span style="font-family:黑體">a</span></strong><span style="font-family:宋體">值，并</span><span style="font-family:宋體">返回土壤電阻率測試模式。</span></span></p><p style="padding: 0.5em 0px; margin: 0px; font-size: 14px; color: rgb(102, 102, 102); line-height: 24px; font-family: "Microsoft YaHei", STXihei, sans-serif, Verdana;"><span style="font-size:16px"><span style="font-family:宋體">設(shè)定完</span><strong><span style="font-family:黑體">a</span></strong><span style="font-family:宋體">值后，在</span><span style="font-family:宋體">土壤電阻率測試模式下，</span><span style="font-family:宋體">按</span><span style="font-family:宋體">“</span><strong><span style="font-family:黑體">START</span></strong><span style="font-family:宋體">”</span><span style="font-family:宋體">鍵開始測試，并倒計數(shù)顯示測試進度，完成測試后顯示穩(wěn)定的土壤電阻率值。</span></span></p><p style="padding: 0.5em 0px; margin: 0px; font-size: 14px; color: rgb(102, 102, 102); line-height: 24px; font-family: "Microsoft YaHei", STXihei, sans-serif, Verdana;"><span style="font-size:16px"><span style="font-family:宋體">如下圖，被測量土壤電阻率為</span><span style="font-family:宋體">53.38</span><span style="font-family:宋體">Ωm，已存157組數(shù)據(jù)，按一下“</span><strong><span style="font-family:黑體">SET</span></strong><span style="font-family:宋體">”鍵顯示輔助電流極</span><strong><span style="font-family:黑體">C</span></strong><strong><span style="font-family:黑體">(H)</span></strong><span style="font-family:宋體">的接地電阻值</span><strong><span style="font-family:黑體">rC</span></strong><span style="font-family:宋體">和輔助電壓極</span><strong><span style="font-family:黑體">P</span></strong><strong><span style="font-family:黑體">(S)</span></strong><span style="font-family:宋體">的接地電阻值</span><strong><span style="font-family:黑體">rP</span></strong><span style="font-family:宋體">,</span><span style="font-family:宋體">顯示完后自動返回顯示</span><span style="font-family:宋體">被測量土壤電阻率</span><strong><span style="font-family:黑體">ρ</span></strong><span style="font-family:宋體">。</span></span></p><p style="padding: 0.5em 0px; margin: 0px; font-size: 14px; color: rgb(102, 102, 102); line-height: 24px; font-family: "Microsoft YaHei", STXihei, sans-serif, Verdana;"><span style="font-size:16px"><img alt="" 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