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class="yj"><a href="/ParentList-1935169.html" class="yja" onmouseover="showsubmenu('高壓核相儀')">高壓核相儀</a> <div class="pvhr3jx3r5" id="submenu_高壓核相儀" style="display:none"> <ul> </ul> </div> </li> </ul> </div> </div></div> <div id="pvhr3jx3r5" class="inpage_right"> <div id="pvhr3jx3r5" class="mbx2"><a href="/">首頁</a> > <a href="/article.html">技術(shù)文章</a> > 土壤電阻率測試儀如何使用</div> <div id="pvhr3jx3r5" class="inpage_content"> <div id="pvhr3jx3r5" class="nr_main_box"> <h1 class="inside_rnewtil">土壤電阻率測試儀如何使用</h1> <div id="pvhr3jx3r5" class="inside_rnewtime">點(diǎn)擊次數(shù)：1552 更新時(shí)間：2018-10-07</div> <div id="pvhr3jx3r5" class="inside_rnewcon"><p><strong>土壤電阻率測試儀</strong>由微處理器控制，可自動(dòng)檢測各接口連接狀況及地網(wǎng)的干擾電壓、干擾頻率，并且具測試輔助接地極電阻值功能。同時(shí)存儲500組數(shù)據(jù)，電阻測量范圍：0.01Ω～30.00kΩ，接地電壓范圍：0.01～100.0V?？赏ㄟ^監(jiān)測軟件在線監(jiān)測數(shù)據(jù)，USB數(shù)據(jù)上傳PC并具有智能報(bào)警提示等*功能</p><p><img alt="" src="http://img49.chem17.com/9/20181007/636745105377321710900.jpg" style="height:400px; width:400px" /></p><p><span style="font-size:14px"><strong>KD3001土壤電阻率測試儀如何使用</strong></span></p><p><span style="font-size:14px">1．開關(guān)機(jī)</span></p><p><span style="font-size:14px">按POWER鍵實(shí)現(xiàn)開關(guān)機(jī)。開機(jī)后有下角顯示“APO”，不操作時(shí)15分鐘后自動(dòng)關(guān)機(jī)。</span></p><p><span style="font-size:14px">2．電池電壓檢查</span></p><p><span style="font-size:14px">開機(jī)后，如果LCD顯示電池電壓低符號“ ”，表示電池電量不足，請及時(shí)充電。電池電力充足能保證測量的精度。電池電量減少時(shí)，電量指示條減少。</span></p><p><span style="font-size:14px">3．接地電壓測試</span></p><p><span style="font-size:14px">接地電壓測試時(shí)需要使用1根輔助接地棒。</span></p><p><span style="font-size:14px">儀表只要通過測試線和輔助接地棒與大地有連接，儀表接口的其他測試線就不能接入商用電源的L、N線中，否則引起漏電，斷路器可能啟動(dòng)，有危險(xiǎn)。</span></p><p><span style="font-size:14px">接地電壓測試不能超過100V。</span></p><p><span style="font-size:14px">接地電壓：即電氣設(shè)備發(fā)生接地故障時(shí)，接地設(shè)備的外殼、接地線、接地體等與零電位點(diǎn)之間的電位差，接地電壓就是以大地為參考點(diǎn),與大地的電位差，大地為零電位點(diǎn)。</span></p><p><span style="font-size:14px">接地電壓測試時(shí)需要使用一根輔助接地棒，注意與商用交流電壓測試的區(qū)別。參見下圖：儀表、輔助接地棒、測試線都連接好后，開機(jī)后，按功能按鍵U檔，LCD顯示測試結(jié)果。</span></p><p style="text-align: center;"><span style="font-size:14px"><img alt="土壤電阻率測試儀操作規(guī)程" data-bd-imgshare-binded="1" src="http://img67.chem17.com/9/20170608/636325238857667332732.png" style="height:277px; width:765px" /></span></p><p><span style="font-size:14px">4．線阻校驗(yàn)</span></p><p><span style="font-size:14px">為了提高現(xiàn)場測量接地電阻的精密性、穩(wěn)定性，避免因測試線長時(shí)間使用線阻變化引起的誤差；避免因測試線未*插入儀表接口或接觸不良引起的誤差；避免因用戶更換或加長測試線引起的誤差等，特設(shè)計(jì)了線阻校驗(yàn)功能，對于低值電阻測量更加。</span></p><p><span style="font-size:14px">連接好測試線與儀表后，將所有測試線的另一端短接，如下圖，按功能鍵R按鈕鈕切換至對應(yīng)的接地電阻測量檔位，按“ ”鍵開始校驗(yàn)，校驗(yàn)中LED指示燈閃爍，LCD倒計(jì)數(shù)顯示，校驗(yàn)完畢LCD顯示線阻值并將該值存儲，在本次開機(jī)接地電阻測量中會自動(dòng)扣除校驗(yàn)的線電阻值。</span></p><p><span style="font-size:14px">關(guān)機(jī)不保存校驗(yàn)線阻值，下次開機(jī)，需要重新校驗(yàn)。</span></p><p><span style="font-size:14px">5．四線精密測試接地電阻</span></p><p><span style="font-size:14px">在測試接地電阻時(shí)，先確認(rèn)接地線的對地電壓值，即H與E或S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(shí)先將被測接地體的設(shè)備斷電，使接地電壓下降后再進(jìn)行接地電阻測試。</span></p><p><span style="font-size:14px">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></p><p><span style="font-size:14px">參見下圖：從被測物體開始，一般間隔5m～20m，分別將S、H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E、ES、S、H接口開始對應(yīng)連接到被測接地極E、輔助電壓極S、輔助電流極H上。</span></p><p><span style="font-size:14px">被測接地體E到電流極H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></p><p><span style="font-size:14px">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)zui大對角線的距離。</span></p><p><span style="font-size:14px">測試時(shí)，測試線不能相互纏繞在一起，否則可能影響測試精度。</span></p><p style="text-align: center;"><span style="font-size:14px"><img alt="土壤電阻率測試儀操作規(guī)程" data-bd-imgshare-binded="1" src="http://img65.chem17.com/9/20170608/636325239960121269454.png" style="height:277px; width:741px" /></span></p><p><span style="font-size:14px"> 對于多點(diǎn)獨(dú)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)zui大對角線長的5倍即可。如下圖：</span></p><p style="text-align: center;"><span style="font-size:14px"><img alt="" data-bd-imgshare-binded="1" src="http://img65.chem17.com/9/20170608/636325240281481833958.png" style="height:356px; width:457px" /></span></p><p><span style="font-size:14px">R=r1∥r2∥r3∥r4∥r5∥r6∥…∥rn（r1…rn都是獨(dú)立接地點(diǎn)）</span></p><p><span style="font-size:14px">R——儀表讀數(shù)，整個(gè)接地系統(tǒng)的總接地電阻值；</span></p><p><span style="font-size:14px">r1…rn——都是獨(dú)立接地點(diǎn)，在地面下各接地體沒有連接在一起；</span></p><p><span style="font-size:14px">RH——輔助電流極H的對地電阻；</span></p><p><span style="font-size:14px">RS——輔助電壓極S的對地電阻；</span></p><p><span style="font-size:14px">n——獨(dú)立接地點(diǎn)的數(shù)量，點(diǎn)數(shù)越多，R值越小。</span></p><p><span style="font-size:14px">連接好測試線后，按功能按鍵R檔，進(jìn)入接地電阻測試模式，按一下“TEST”鍵開始測試，測試過程中有倒計(jì)數(shù)指示指示，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R和輔助電流極H與輔助電壓極S的接地電阻值RH、RS 。</span></p><p><span style="font-size:14px">如下圖，被測試接地電阻值為2.77Ω，輔助電流極RH的接地電阻為0.27KΩ；輔助電壓極RS的接地電阻值為0.22KΩ。</span></p><p style="text-align: center;"><span style="font-size:14px"><img alt="晟皋牌SG3001土壤電阻率測試儀" data-bd-imgshare-binded="1" src="http://img66.chem17.com/9/20170608/636325240671794519341.png" style="height:196px; width:269px" /></span></p><p><span style="font-size:14px">6．三線測試接地電阻</span></p><p><span style="font-size:14px">三線測試：如下圖，短接儀表的ES、E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，測量時(shí)還需去除被測接地體表面的氧化層。</span></p><p style="text-align: center;"><span style="font-size:14px"> <img alt="" data-bd-imgshare-binded="1" src="http://img67.chem17.com/9/20170608/636325241011251115959.png" style="height:279px; width:684px" /></span></p><p><span style="font-size:14px">7．二線簡易測試接地電阻</span></p><p><span style="font-size:14px">二線測試：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zui小的接地極作為輔助接地極，使用2條簡易測試線連接H-S接口短接、E-ES接口短接)?？梢岳媒饘偎堋⑾浪ǖ冉饘俾裨O(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H、S，測量時(shí)注意去除所選金屬輔助接地體連接點(diǎn)的氧化層。接線如下圖，儀表操作同四線測試。</span></p><p><span style="font-size:14px">選用商用電源系統(tǒng)接地作為輔助接地極測量時(shí)，必須先確認(rèn)是商用電源系統(tǒng)的接地極，否則斷路器可能啟動(dòng)，有危險(xiǎn)。</span></p><p><span style="font-size:14px">采用簡易二線法測量接地電阻，盡量選擇re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(shí)值。測量時(shí)請優(yōu)先選擇金屬水管、金屬消防栓做為輔助接地極。</span></p><p style="text-align: center;"><span style="font-size:14px"><img alt="" data-bd-imgshare-binded="1" src="http://img66.chem17.com/9/20170608/636325241475195930693.png" style="height:441px; width:668px" /></span></p><p><span style="font-size:14px">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></p><p><span style="font-size:14px">R=RX＋re</span></p><p><span style="font-size:14px">其中：R——為儀表讀數(shù)值；</span></p><p><span style="font-size:14px">RX——為被測接地體的接地電阻值；</span></p><p><span style="font-size:14px">re——為商用電力系統(tǒng)等共同接地體的接地電阻值。</span></p><p><span style="font-size:14px">那么，被測接地體的接地電阻值為：</span></p><p><span style="font-size:14px">RX=R－re</span></p><p><span style="font-size:14px">8．土壤電阻率測試</span></p><p><span style="font-size:14px">土壤電阻率ρ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率，就是同一種土壤，由于溫度和含水量等不同，土壤電阻率也會隨之發(fā)生顯著的變化。因此，為了在進(jìn)行接地裝置設(shè)計(jì)時(shí)有正確的依據(jù)，使所設(shè)計(jì)的接地裝置更能符合實(shí)際工作的需要，必須進(jìn)行土壤電阻率的測量。長</span></p><p><span style="font-size:14px">土壤電阻率用四極法(溫納法)進(jìn)行測量。</span></p><p><span style="font-size:14px">根據(jù)公式ρ=2πaR(Ωm)計(jì)算土壤電阻率ρ，單位為Ωm，其中：</span></p><p><span style="font-size:14px">a——電極間距</span></p><p><span style="font-size:14px">R——S-ES電極間土壤的電阻</span></p><p><span style="font-size:14px">四極法(溫納法)：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H、S、ES、E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H、S、ES、E接口開始對應(yīng)連接到被測H、S、ES、E輔助接地棒上。</span></p><p style="text-align: center;"><span style="font-size:14px"><img alt="" data-bd-imgshare-binded="1" src="http://img65.chem17.com/9/20170608/636325242106373038841.png" style="height:223px; width:722px" /></span></p><p><span style="font-size:14px">輔助接地棒的間距設(shè)置：連接好測試線后，開機(jī)按功能按鍵ρ，進(jìn)入土壤電阻率測試模式，長按“SET”鍵(超過3秒)進(jìn)入輔助接地棒的間距設(shè)置，短按“ ”鍵移動(dòng)光標(biāo)，按“ ”或“ ”鍵改變當(dāng)前數(shù)字大小(a值范圍:1m～100m)，再長按“SET”鍵(超過3秒)保存設(shè)定的a值，并返回土壤電阻率測試模式。</span></p><p><span style="font-size:14px">設(shè)定完a值后，在土壤電阻率測試模式下，按“TEST”鍵開始測試，并倒計(jì)數(shù)顯示測試進(jìn)度，完成測試后顯示穩(wěn)定的土壤電阻率值。</span></p><p><span style="font-size:14px">如下圖，被測量土壤電阻率為47.23Ωm，輔助電流極的接地電阻值RH為0.34KΩ和輔助電壓極的接地電阻值RS為0.28KΩ,顯示完后自動(dòng)返回顯示被測量土壤電阻率ρ。</span></p><p style="text-align: center;"><span style="font-size:14px"><img alt="晟皋牌SG3001土壤電阻率測試儀" data-bd-imgshare-binded="1" src="http://img65.chem17.com/9/20170608/636325242486077705418.png" style="height:196px; width:269px" /></span></p></div> <div id="pvhr3jx3r5" class="inside_newsthree"> <p id="newsprev">上一篇：<b class="newsprev"><a 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