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在現(xiàn)代社會中，電力系統(tǒng)扮演著十分重要的角色，加強接地裝置的安全性以及監(jiān)測的實時性，是確保輸電線路安全運行和電網(wǎng)安全運行的重要措施之一。而隨著社會的飛速發(fā)展，出現(xiàn)了各種各樣的無土壤環(huán)境（如：水泥地、高層建筑等），這些接地體被混凝土覆蓋，此時傳統(tǒng)的“地樁式"（在大地土壤中打輔助接地極）方法會派不上用場。</span><br style="padding: 0px; margin: 0px; color: rgb(51, 51, 51); font-family: "Microsoft YaHei", BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Segoe UI Symbol"; font-size: 16px; text-align: justify; white-space: normal; background-color: rgb(255, 255, 255);"/><span style="color: rgb(51, 51, 51); font-family: "Microsoft YaHei", BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Segoe UI Symbol"; font-size: 16px; text-align: justify; background-color: rgb(255, 255, 255);"> 下面我們介紹如何使用ETCR2000鉗形接地電阻儀（以下簡稱鉗形表）在無土壤環(huán)境下測試單點接地體的接地電阻。從測試原理來說，鉗形表只能測量回路電阻，對單點接地體是測不出來的。但是，我們可以利用一根測試線及接地體附近的接地極（如：接地良好的消防栓等），人為地制造一個回路進行測試，我們總結(jié)出兩種測量方法：二點法和三點法。</span><br style="padding: 0px; margin: 0px; color: rgb(51, 51, 51); font-family: "Microsoft YaHei", BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Segoe UI Symbol"; font-size: 16px; text-align: justify; white-space: normal; background-color: rgb(255, 255, 255);"/><span style="color: rgb(51, 51, 51); font-family: "Microsoft YaHei", BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Segoe UI Symbol"; font-size: 16px; text-align: justify; background-color: rgb(255, 255, 255);"> 本次實驗我們計劃使用ETCR2000鉗形接地電阻儀測量室內(nèi)實驗室中的一處接地體A的電阻值RA，該接地體的接地電阻允許值是＜4Ω。</span><br style="padding: 0px; margin: 0px; color: rgb(51, 51, 51); font-family: "Microsoft YaHei", BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Segoe UI Symbol"; font-size: 16px; text-align: justify; white-space: normal; background-color: rgb(255, 255, 255);"/><span style="color: rgb(51, 51, 51); font-family: "Microsoft YaHei", BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Segoe UI Symbol"; font-size: 16px; text-align: justify; background-color: rgb(255, 255, 255);">1、二點法，測量原理請見下圖，此方法可以測量接地體的接地電阻近似值。</span><br style="padding: 0px; margin: 0px; color: rgb(51, 51, 51); font-family: "Microsoft YaHei", BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Segoe UI Symbol"; font-size: 16px; text-align: justify; white-space: normal; background-color: rgb(255, 255, 255);"/><img alt="" src="https://img57.chem17.com/9/20240403/638477254584385231316.png" style="padding: 0px; margin: 0px; border: 0px; max-width: 100%; color: rgb(51, 51, 51); font-family: "Microsoft YaHei", BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Segoe UI Symbol"; font-size: 16px; text-align: justify; white-space: normal; background-color: rgb(255, 255, 255); height: auto !important;"/><br style="padding: 0px; margin: 0px; color: rgb(51, 51, 51); font-family: "Microsoft YaHei", BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Segoe UI Symbol"; font-size: 16px; text-align: justify; white-space: normal; background-color: rgb(255, 255, 255);"/><span style="color: rgb(51, 51, 51); font-family: "Microsoft YaHei", BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Segoe UI Symbol"; font-size: 16px; text-align: justify; background-color: rgb(255, 255, 255);"> 被測接地體的接地電阻為： R = R表 - R輔 - R線</span><br style="padding: 0px; margin: 0px; color: rgb(51, 51, 51); font-family: "Microsoft YaHei", BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Segoe UI Symbol"; font-size: 16px; text-align: justify; white-space: normal; background-color: rgb(255, 255, 255);"/><span style="color: rgb(51, 51, 51); font-family: "Microsoft YaHei", BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Segoe UI Symbol"; font-size: 16px; text-align: justify; background-color: rgb(255, 255, 255);"> 注：R表為鉗表所測阻值；R輔為輔助地極的接地電阻；R線是測試線的阻值。</span><br style="padding: 0px; margin: 0px; color: rgb(51, 51, 51); font-family: "Microsoft YaHei", BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Segoe UI Symbol"; font-size: 16px; text-align: justify; white-space: normal; background-color: rgb(255, 255, 255);"/><span style="color: rgb(51, 51, 51); font-family: "Microsoft YaHei", BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Segoe UI Symbol"; font-size: 16px; text-align: justify; background-color: rgb(255, 255, 255);"> 如果鉗表所測的阻值小于被測地極接地電阻的允許值，那么被測地極的接地電阻是合格的。如果輔助地極接地良好（如消防栓或金屬自來水管等），由于輔助地極的接地電阻很小，所以被測地極的接地電阻近似于鉗表所測的阻值。</span><br style="padding: 0px; margin: 0px; color: rgb(51, 51, 51); font-family: "Microsoft YaHei", BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Segoe UI Symbol"; font-size: 16px; text-align: justify; white-space: normal; background-color: rgb(255, 255, 255);"/><span style="color: rgb(51, 51, 51); font-family: "Microsoft YaHei", BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Segoe UI Symbol"; font-size: 16px; text-align: justify; background-color: rgb(255, 255, 255);">第一步：測試線連接被測接地體A點。</span></span></strong></p><p><strong><span style="font-family: 宋體, SimSun; font-size: 16px;"><span style="color: rgb(51, 51, 51); font-family: "Microsoft YaHei", BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Segoe UI Symbol"; font-size: 16px; text-align: justify; background-color: rgb(255, 255, 255);"><span style="color: rgb(51, 51, 51); font-family: "Microsoft YaHei", BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Segoe UI Symbol"; font-size: 16px; text-align: justify; background-color: rgb(255, 255, 255);">第一步：測試線連接被測接地體A點。</span><br style="padding: 0px; margin: 0px; color: rgb(51, 51, 51); font-family: "Microsoft YaHei", BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Segoe UI Symbol"; font-size: 16px; text-align: justify; white-space: normal; background-color: rgb(255, 255, 255);"/><img alt="" src="https://img57.chem17.com/9/20240403/638477254837160366319.png" style="padding: 0px; margin: 0px; border: 0px; max-width: 100%; color: rgb(51, 51, 51); font-family: "Microsoft YaHei", BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Segoe UI Symbol"; font-size: 16px; text-align: justify; white-space: normal; background-color: rgb(255, 255, 255); height: 462px; width: 592px;" width="592" height="462"/><br style="padding: 0px; margin: 0px; color: rgb(51, 51, 51); font-family: "Microsoft YaHei", BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Segoe UI Symbol"; font-size: 16px; text-align: justify; white-space: normal; background-color: rgb(255, 255, 255);"/><span style="color: rgb(51, 51, 51); font-family: "Microsoft YaHei", BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Segoe UI Symbol"; font-size: 16px; text-align: justify; background-color: rgb(255, 255, 255);"> 第二步：測試線連接消防栓B點，注意需要刮去消防栓表面的油漆。</span><br style="padding: 0px; margin: 0px; color: rgb(51, 51, 51); font-family: "Microsoft YaHei", BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Segoe UI Symbol"; font-size: 16px; text-align: justify; white-space: normal; background-color: rgb(255, 255, 255);"/><img alt="" src="https://img57.chem17.com/9/20240403/638477254837785613919.png" style="padding: 0px; margin: 0px; border: 0px; max-width: 100%; color: rgb(51, 51, 51); font-family: "Microsoft YaHei", BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Segoe UI Symbol"; font-size: 16px; text-align: justify; white-space: normal; background-color: rgb(255, 255, 255); height: 447px; width: 596px;" width="596" height="447"/><br style="padding: 0px; margin: 0px; color: rgb(51, 51, 51); font-family: "Microsoft YaHei", BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Segoe UI Symbol"; font-size: 16px; text-align: justify; white-space: normal; background-color: rgb(255, 255, 255);"/><span style="color: rgb(51, 51, 51); font-family: "Microsoft YaHei", BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Segoe UI Symbol"; font-size: 16px; text-align: justify; background-color: rgb(255, 255, 255);">第三步：測量A、B點間的阻值R=2.1Ω。</span><br style="padding: 0px; margin: 0px; color: rgb(51, 51, 51); font-family: "Microsoft YaHei", BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Segoe UI Symbol"; font-size: 16px; text-align: justify; white-space: normal; background-color: rgb(255, 255, 255);"/><img alt="" src="https://img57.chem17.com/9/20240403/638477254838722654209.png" style="padding: 0px; margin: 0px; border: 0px; max-width: 100%; color: rgb(51, 51, 51); font-family: "Microsoft YaHei", BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Segoe UI Symbol"; font-size: 16px; text-align: justify; white-space: normal; background-color: rgb(255, 255, 255); height: auto !important;"/><br style="padding: 0px; margin: 0px; color: rgb(51, 51, 51); font-family: "Microsoft YaHei", BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Segoe UI Symbol"; font-size: 16px; text-align: justify; white-space: normal; background-color: rgb(255, 255, 255);"/><span style="color: rgb(51, 51, 51); font-family: "Microsoft YaHei", BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Segoe UI Symbol"; font-size: 16px; text-align: justify; background-color: rgb(255, 255, 255);">第四步：將測試線頭尾相連用鉗形表測量出測試線的阻值RL=0.4Ω。</span><br style="padding: 0px; margin: 0px; color: rgb(51, 51, 51); font-family: "Microsoft YaHei", BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Segoe UI Symbol"; font-size: 16px; text-align: justify; white-space: normal; background-color: rgb(255, 255, 255);"/><span style="color: rgb(51, 51, 51); font-family: "Microsoft YaHei", BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Segoe UI Symbol"; font-size: 16px; text-align: justify; background-color: rgb(255, 255, 255);">測量結(jié)果：（RA+RB）=R-RL=2.1Ω-0.49Ω=1.61Ω，RA＜1.61Ω說明A點的接地電阻值是合格的。</span><br style="padding: 0px; margin: 0px; color: rgb(51, 51, 51); font-family: "Microsoft YaHei", BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Segoe UI Symbol"; font-size: 16px; text-align: justify; white-space: normal; background-color: rgb(255, 255, 255);"/><br style="padding: 0px; margin: 0px; color: rgb(51, 51, 51); font-family: "Microsoft YaHei", BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Segoe UI Symbol"; font-size: 16px; text-align: justify; white-space: normal; background-color: rgb(255, 255, 255);"/><span style="color: rgb(51, 51, 51); font-family: "Microsoft YaHei", BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Segoe UI Symbol"; font-size: 16px; text-align: justify; background-color: rgb(255, 255, 255);">2、三點法，測量原理請見下圖，此方法可準確測量接地體的接地電阻值。</span><br style="padding: 0px; margin: 0px; color: rgb(51, 51, 51); font-family: "Microsoft YaHei", BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Segoe UI Symbol"; font-size: 16px; text-align: justify; white-space: normal; background-color: rgb(255, 255, 255);"/><img alt="" src="https://img57.chem17.com/9/20240403/638477254839347654524.png" style="padding: 0px; margin: 0px; border: 0px; max-width: 100%; color: rgb(51, 51, 51); font-family: "Microsoft YaHei", BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Segoe UI Symbol"; font-size: 16px; text-align: justify; white-space: normal; background-color: rgb(255, 255, 255); height: auto !important;"/><br style="padding: 0px; margin: 0px; color: rgb(51, 51, 51); font-family: "Microsoft YaHei", BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Segoe UI Symbol"; font-size: 16px; text-align: justify; white-space: normal; background-color: rgb(255, 255, 255);"/><span style="color: rgb(51, 51, 51); font-family: "Microsoft YaHei", BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Segoe UI Symbol"; font-size: 16px; text-align: justify; background-color: rgb(255, 255, 255);">由于：R1=RA+RB</span><br style="padding: 0px; margin: 0px; color: rgb(51, 51, 51); font-family: "Microsoft YaHei", BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Segoe UI Symbol"; font-size: 16px; text-align: justify; white-space: normal; background-color: rgb(255, 255, 255);"/><span style="color: rgb(51, 51, 51); font-family: "Microsoft YaHei", BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Segoe UI Symbol"; font-size: 16px; text-align: justify; background-color: rgb(255, 255, 255);"> R2=RA+RC</span><br style="padding: 0px; margin: 0px; color: rgb(51, 51, 51); font-family: "Microsoft YaHei", BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Segoe UI Symbol"; font-size: 16px; text-align: justify; white-space: normal; background-color: rgb(255, 255, 255);"/><span style="color: rgb(51, 51, 51); font-family: "Microsoft YaHei", BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Segoe UI Symbol"; font-size: 16px; text-align: justify; background-color: rgb(255, 255, 255);"> R3=RB+RC</span><br style="padding: 0px; margin: 0px; color: rgb(51, 51, 51); font-family: "Microsoft YaHei", BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Segoe UI Symbol"; font-size: 16px; text-align: justify; white-space: normal; background-color: rgb(255, 255, 255);"/><span style="color: rgb(51, 51, 51); font-family: "Microsoft YaHei", BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Segoe UI Symbol"; font-size: 16px; text-align: justify; background-color: rgb(255, 255, 255);">所以：RA=(R1+R2-R3)/2</span><br style="padding: 0px; margin: 0px; color: rgb(51, 51, 51); font-family: "Microsoft YaHei", BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Segoe UI Symbol"; font-size: 16px; text-align: justify; white-space: normal; background-color: rgb(255, 255, 255);"/><span style="color: rgb(51, 51, 51); font-family: "Microsoft YaHei", BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Segoe UI Symbol"; font-size: 16px; text-align: justify; background-color: rgb(255, 255, 255);">注：測量R1時AC、BC間不能有導線連接。R2、R3類推。</span><br style="padding: 0px; margin: 0px; color: rgb(51, 51, 51); font-family: "Microsoft YaHei", BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Segoe UI Symbol"; font-size: 16px; text-align: justify; white-space: normal; background-color: rgb(255, 255, 255);"/><span style="color: rgb(51, 51, 51); font-family: "Microsoft YaHei", BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Segoe UI Symbol"; font-size: 16px; text-align: justify; background-color: rgb(255, 255, 255);">這時我們需要用上第三個接地體消防栓C點，分別測量AB、AC、BC間的阻值。</span><br style="padding: 0px; margin: 0px; color: rgb(51, 51, 51); font-family: "Microsoft YaHei", BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Segoe UI Symbol"; font-size: 16px; text-align: justify; white-space: normal; background-color: rgb(255, 255, 255);"/><span style="color: rgb(51, 51, 51); font-family: "Microsoft YaHei", BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Segoe UI Symbol"; font-size: 16px; text-align: justify; background-color: rgb(255, 255, 255);">第一步：測量AB間的阻值R1=2.1Ω</span><br style="padding: 0px; margin: 0px; color: rgb(51, 51, 51); font-family: "Microsoft YaHei", BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Segoe UI Symbol"; font-size: 16px; text-align: justify; white-space: normal; background-color: rgb(255, 255, 255);"/><img alt="" src="https://img56.chem17.com/9/20240403/638477254846481689666.png" style="padding: 0px; margin: 0px; border: 0px; max-width: 100%; color: rgb(51, 51, 51); font-family: "Microsoft YaHei", BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Segoe UI Symbol"; font-size: 16px; text-align: justify; white-space: normal; background-color: rgb(255, 255, 255); height: auto !important;"/><br style="padding: 0px; margin: 0px; color: rgb(51, 51, 51); font-family: "Microsoft YaHei", BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Segoe UI Symbol"; font-size: 16px; text-align: justify; white-space: normal; background-color: rgb(255, 255, 255);"/><span style="color: rgb(51, 51, 51); font-family: "Microsoft YaHei", BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Segoe UI Symbol"; font-size: 16px; text-align: justify; background-color: rgb(255, 255, 255);">第二步：測量AC間阻值R2=2.9Ω</span><br style="padding: 0px; margin: 0px; color: rgb(51, 51, 51); font-family: "Microsoft YaHei", BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Segoe UI Symbol"; font-size: 16px; text-align: justify; white-space: normal; background-color: rgb(255, 255, 255);"/><img alt="" src="https://img59.chem17.com/9/20240403/638477254851899656546.png" style="padding: 0px; margin: 0px; border: 0px; max-width: 100%; color: rgb(51, 51, 51); font-family: "Microsoft YaHei", BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Segoe UI Symbol"; font-size: 16px; text-align: justify; white-space: normal; background-color: rgb(255, 255, 255); height: auto !important;"/><br style="padding: 0px; margin: 0px; color: rgb(51, 51, 51); font-family: "Microsoft YaHei", BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Segoe UI Symbol"; font-size: 16px; text-align: justify; white-space: normal; background-color: rgb(255, 255, 255);"/><span style="color: rgb(51, 51, 51); font-family: "Microsoft YaHei", BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Segoe UI Symbol"; font-size: 16px; text-align: justify; background-color: rgb(255, 255, 255);">第三步：測量BC間的阻值R3=2.3Ω</span><br style="padding: 0px; margin: 0px; color: rgb(51, 51, 51); font-family: "Microsoft YaHei", BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Segoe UI Symbol"; font-size: 16px; text-align: justify; white-space: normal; background-color: rgb(255, 255, 255);"/><img alt="" src="https://img59.chem17.com/9/20240403/638477254852837121717.png" style="padding: 0px; margin: 0px; border: 0px; max-width: 100%; color: rgb(51, 51, 51); font-family: "Microsoft YaHei", BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Segoe UI Symbol"; font-size: 16px; text-align: justify; white-space: normal; background-color: rgb(255, 255, 255); height: 467px; width: 607.3px;" width="607" height="467"/><br style="padding: 0px; margin: 0px; color: rgb(51, 51, 51); font-family: "Microsoft YaHei", BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Segoe UI Symbol"; font-size: 16px; text-align: justify; white-space: normal; background-color: rgb(255, 255, 255);"/><span style="color: rgb(51, 51, 51); font-family: "Microsoft YaHei", BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Segoe UI Symbol"; font-size: 16px; text-align: justify; background-color: rgb(255, 255, 255);"> 測量結(jié)果：RA=(R1+R2-R3)/2=2.1+2.9-2.3）/2=1.35Ω，A點的接地電阻值是合格的。為了便于記憶，可將三個接地體看作一個三角形，則被測電阻等于鄰邊電阻相加，然后減對邊電阻除2。</span><br style="padding: 0px; margin: 0px; color: rgb(51, 51, 51); font-family: "Microsoft YaHei", BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Segoe UI Symbol"; font-size: 16px; text-align: justify; white-space: normal; background-color: rgb(255, 255, 255);"/><span style="color: rgb(51, 51, 51); font-family: "Microsoft YaHei", BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Segoe UI Symbol"; font-size: 16px; text-align: justify; background-color: rgb(255, 255, 255);"> 測試結(jié)果也證明鉗形接地電阻儀采用二點法和三點法，能快速測量單點接地體的接地電阻值，能應(yīng)用于地樁式接地電阻測試儀無法測試的場合。</span></span></span></strong></p> <div id="iqaqewgi6e" class="clear"></div> </div> <div id="iqaqewgi6e" class="article"> <p>上一篇：<a href="/Article-3652615.html">RK2672DM耐壓測試儀前面板說明</a></p> <p>下一篇：<a href="/Article-3650081.html">KDDL-2000B大電流發(fā)生器液晶帶極性輸出</a></p> </div> <div id="iqaqewgi6e" class="clear"></div> </div> </div> <div id="iqaqewgi6e" class="n-9"> <div id="iqaqewgi6e" class="c-right"> <div id="iqaqewgi6e" class="c-1 r-pro"> <div id="iqaqewgi6e" class="c-left"> <div id="iqaqewgi6e" class="h-2"><a href="/products.html">產(chǎn)品分類</a></div> <ul> <li><a href="/ParentList-1388067.html" onmouseover="showsubmenu('大電流發(fā)生器')" class="yj">大電流發(fā)生器</a> <div class="iqaqewgi6e" 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href="/ParentList-1346337.html" onmouseover="showsubmenu('滑動變阻器')" class="yj">滑動變阻器</a> <div class="iqaqewgi6e" id="submenu_滑動變阻器" style="display:none"> <ul> <li><a href="/SonList-1346340.html">> 滑動變阻器</a></li> <li><a href="/SonList-1346339.html">> 雙管滑線滑動變阻器</a></li> <li><a href="/SonList-1346338.html">> 旋轉(zhuǎn)式變阻器</a></li> </ul> </div> </li> <li><a href="/ParentList-1344164.html" onmouseover="showsubmenu('硅橡膠加熱器電加熱器康登電氣')" class="yj">硅橡膠加熱器電加熱器康登電氣</a> <div class="iqaqewgi6e" id="submenu_硅橡膠加熱器電加熱器康登電氣" style="display:none"> <ul> <li><a href="/SonList-1344170.html">> 硅橡膠加熱器</a></li> <li><a href="/SonList-1344169.html">> 鑄鋁加熱器</a></li> <li><a href="/SonList-1344168.html">> 電熱管</a></li> <li><a href="/SonList-1344166.html">> 空氣加熱器</a></li> <li><a href="/SonList-1344165.html">> 全自動溫控加熱器</a></li> </ul> </div> </li> <li><a href="/ParentList-1359477.html" onmouseover="showsubmenu('絕緣梯')" class="yj">絕緣梯</a> <div class="iqaqewgi6e" id="submenu_絕緣梯" style="display:none"> <ul> <li><a 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style="display:none"> <ul> <li><a href="/SonList-1324457.html">> 液壓鉗（進口）</a></li> <li><a href="/SonList-1324456.html">> 充電式液壓線纜剪</a></li> <li><a href="/SonList-1324455.html">> 充電式液壓電纜鉗</a></li> <li><a href="/SonList-1324454.html">> 剝線鉗</a></li> <li><a href="/SonList-1324453.html">> 線纜剪</a></li> <li><a href="/SonList-1324452.html">> 液壓導線鉗</a></li> <li><a href="/SonList-1324451.html">> 壓接鉗</a></li> <li><a href="/SonList-1324450.html">> 液壓鉗</a></li> </ul> </div> </li> <li><a href="/ParentList-1324332.html" onmouseover="showsubmenu('繞組匝間沖擊耐電壓試驗儀')" class="yj">繞組匝間沖擊耐電壓試驗儀</a> <div class="iqaqewgi6e" id="submenu_繞組匝間沖擊耐電壓試驗儀" style="display:none"> <ul> <li><a href="/SonList-1324343.html">> 耐電壓試驗儀</a></li> </ul> </div> </li> <li><a href="/ParentList-1324322.html" onmouseover="showsubmenu('直流高壓發(fā)生器')" class="yj">直流高壓發(fā)生器</a> <div class="iqaqewgi6e" id="submenu_直流高壓發(fā)生器" style="display:none"> <ul> <li><a href="/SonList-1324326.html">> 直流高壓發(fā)生器</a></li> <li><a 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<li><a href="/SonList-1323607.html">> 液壓升降臺</a></li> <li><a href="/SonList-1323606.html">> 液壓叉車、電動叉車</a></li> <li><a href="/SonList-1323604.html">> 液壓搬運車、電動搬運車</a></li> </ul> </div> </li> <li><a href="/ParentList-1323475.html" onmouseover="showsubmenu('焊割設(shè)備、坡口機總匯')" class="yj">焊割設(shè)備、坡口機總匯</a> <div class="iqaqewgi6e" id="submenu_焊割設(shè)備、坡口機總匯" style="display:none"> <ul> <li><a href="/SonList-1323542.html">> 交直流氬弧焊機</a></li> <li><a href="/SonList-1323497.html">> 氣割機</a></li> <li><a href="/SonList-1323495.html">> 坡口機</a></li> <li><a href="/SonList-1323494.html">> 焊條焊箱、保溫箱</a></li> <li><a href="/SonList-1323493.html">> 螺栓焊機</a></li> <li><a href="/SonList-1323491.html">> 點焊機</a></li> <li><a href="/SonList-1323490.html">> 二氧化碳氣體焊機</a></li> <li><a href="/SonList-1323487.html">> 直流氬弧焊機</a></li> <li><a href="/SonList-1323482.html">> 直流弧焊機</a></li> <li><a href="/SonList-1323480.html">> 空氣等離子切割機</a></li> </ul> </div> </li> <li><a href="/ParentList-1323229.html" 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