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<p><strong>雙鉗口接地電阻測試儀主要特點面板功能簡介原理</strong></p><p><span style="font-family:宋體; font-size:12px">優(yōu)良的接地系統(tǒng)是電力、電信、電氣設備安全可靠運行的重要保證。接地電阻大小是接地系統(tǒng)品質(zhì)優(yōu)劣的評判依據(jù)。、快速、簡捷、可靠的接地電阻測量方法，已成為防雷接地領域內(nèi)技術進步的迫切需要。ET3000雙鉗多功能接地電阻測試儀適用于電信、電力、氣象、機房、電力配電線路、鐵塔輸電線路、加油站、工廠接地網(wǎng)、避雷針等。</span></p><p><span style="font-family:宋體; font-size:12px"><img alt="" src="http://img65.chem17.com/9/20170910/636406235423080297378.png" style="height:486px; width:675px" /></span><br /><span style="font-family:宋體; font-size:12px">該儀器除了具有傳統(tǒng)打輔助地極測接地電阻的功能外，還具備了無輔助地極測量的*功能，改變了測試接地電阻傳統(tǒng)的測量原理和手段：采用雙鉗口非接觸測量技術無需打輔助地極，也無需將接地體與負載隔離，實現(xiàn)了在線測量。在單點接地系統(tǒng)、干擾性強等條件下，可以采用打輔助地極的測量方式進行測量。</span><br /><br /><span style="font-family:宋體; font-size:12px">三、</span>ET3000接地電阻測試儀<span style="font-family:宋體; font-size:12px">主要特點</span><br /><span style="font-family:宋體; font-size:12px">1．雙鉗法/地樁法雙重測量方式：</span><br /><span style="font-family:宋體; font-size:12px">適合任意接地場所，多點或單點接地，都可正常測試；</span><br /><span style="font-family:宋體; font-size:12px">2．抗干擾能力強：</span><br /><span style="font-family:宋體; font-size:12px">自產(chǎn)生高頻電流，從而過濾市電中50Hz、100Hz等諧波干擾電流，即使在500KV變電站環(huán)境下，也能測量；</span><br /><span style="font-family:宋體; font-size:12px">3．測量范圍廣、分辨率高：</span><br /><span style="font-family:宋體; font-size:12px">量程從0.01Ω～200Ω，分辨率0.01Ω，對0.7Ω以下接地電阻，也能準確測量；</span><br /><span style="font-family:宋體; font-size:12px">4．大鉗口設計：</span><br /><span style="font-family:宋體; font-size:12px">鉗口直徑50mm（標準配置），滿足用扁鐵/鋼作接地引線的情況，特殊鉗口尺寸可按客戶要求定制；</span><br /><span style="font-family:宋體; font-size:12px">5．大容量數(shù)據(jù)存儲：</span><br /><span style="font-family:宋體; font-size:12px">可儲存200組測量數(shù)據(jù)；</span><br /><span style="font-family:宋體; font-size:12px">6．操作簡單，單人作業(yè)：</span><br /><span style="font-family:宋體; font-size:12px">全中文操作界面、體積小、重量輕，防爆便攜箱，野外測量攜帶方便。</span><br /><br /><span style="font-family:宋體; font-size:12px">四、</span><span style="font-family:宋體; font-size:12px"> </span>ET3000數(shù)字接地電阻測試儀<span style="font-family:宋體; font-size:12px">主要技術指標</span><br /><span style="font-family:宋體; font-size:12px">1．接地電阻測量范圍：</span><br /><span style="font-family:宋體; font-size:12px">雙鉗法：0.01Ω～200Ω</span><br /><span style="font-family:宋體; font-size:12px">地樁法：0.01Ω～200Ω</span><br /><span style="font-family:宋體; font-size:12px">2．準確度:</span><br /><span style="font-family:宋體; font-size:12px">雙鉗法：±3%±2個字</span><br /><span style="font-family:宋體; font-size:12px">地樁法：±2%±2個字</span><br /><span style="font-family:宋體; font-size:12px">3．zui小分辨率：0.01Ω</span><br /><span style="font-family:宋體; font-size:12px">4．鉗口尺寸：Φ50mm </span><br /><span style="font-family:宋體; font-size:12px">5．存儲容量：200組數(shù)據(jù)</span><br /><span style="font-family:宋體; font-size:12px">6．工作溫度：0ºC ～ + 50°C</span><br /><span style="font-family:宋體; font-size:12px">7．供電方式：8節(jié)5號鎳氫充電電池或普通AA電池</span><br /><span style="font-family:宋體; font-size:12px">8．重量：0.8KG(含電池)</span><br /><span style="font-family:宋體; font-size:12px">9．尺寸：265mm×130mm×65mm</span><br /><br /><span style="font-family:宋體; font-size:12px">五、面板功能簡介</span><br /><span style="font-family:宋體; font-size:12px">1、按鍵功能</span><br /><span style="font-family:宋體; font-size:12px">本機共設七個按鍵，具體功能如下：</span><br /><span style="font-family:宋體; font-size:12px">“電源”：電源開關鍵；在開機后，5分鐘不做任何操作會自動關機。</span><br /><span style="font-family:宋體; font-size:12px">“雙鉗法▲”：在多點接地的接地網(wǎng)中，用這種方式進行測試；另外，在其它功能時，此鍵為向上光標或增加鍵。</span><br /><span style="font-family:宋體; font-size:12px">“地樁法▼”：按此鍵采用打輔助地樁的方式測量接地電阻，另外，在其它功能時，此鍵為向下光標或減小鍵。</span><br /><span style="font-family:宋體; font-size:12px">“”：光標左移鍵。</span><br /><span style="font-family:宋體; font-size:12px">“”：光標右移鍵。</span><br /><span style="font-family:宋體; font-size:12px">“測試”：在雙鉗法或地樁法測量時，按此鍵開始測量。</span><br /><span style="font-family:宋體; font-size:12px">“確認”：按此鍵進入選定的功能。</span><br /><br /><span style="font-family:宋體; font-size:12px">2、測試端口（見圖1所示）</span><br /><img alt="" src="http://i01.yizimg.com/ComFolder/586162/201403/%E6%88%AA%E5%9B%BE20140321104735.jpg" style="height:auto; margin:0px auto 5px !important; width:352px" /><br /><span style="font-family:宋體; font-size:12px">圖1 面板接線柱</span><br /><span style="font-family:宋體; font-size:12px">該儀表與外界連接的接口有兩組：雙鉗法使用上部的“接收”和“發(fā)射”兩個航插；地樁法使用下部的“C2”、“P2”、“P1”和“C1”四個插孔。</span><br /><span style="font-family:宋體; font-size:12px">充電插孔位于儀器的左下方，當儀表顯示屏左上角的電量指示變低時，請用本公司配套的地阻儀充電器進行充電。該充電器為智能充電器，當電池充滿時，即充電器指示燈熄滅時，自動停止對電池進行充電，有效防止電池過充。</span><br /><span style="font-family:宋體; font-size:12px">注意：儀表長期不用時，應定期對電池進行充電（如兩個月），避免電池過度放電而損壞。用普通電池時切勿充電。</span><br /><br /><span style="font-family:宋體; font-size:12px">六、測量原理及使用方法</span><br /><span style="font-family:宋體; font-size:12px">㈠、雙鉗法</span><br /><span style="font-family:宋體; font-size:12px">1、測量原理</span><br /><span style="font-family:宋體; font-size:12px">此方法的優(yōu)點在于：一是操作簡單。可以在不斷開待測設備電源，在其正常工作時進行測試，不必插入測量探頭，也不必將被測電極分開，只需要雙鉗夾著接地導體就可以測出其接地電阻。二是精度高。其精度可以達到0.01Ω。三是抗干擾能力強?？梢詾V出各種工頻諧波。四是可以作為打地樁方式的補充。在很多條件下（如房屋密集或鋪滿水泥的地區(qū)），很難甚至不可能采用打樁的方式對接地電阻的測量，使用雙鉗口測試原理，可以不用打接地樁進行測量。該測量原理的的不足是：不能夠直接對單點接地系統(tǒng)的測量。在單點接地系統(tǒng)中應慎用鉗形地阻表。</span><br /><span style="font-family:宋體; font-size:12px">其測量原理簡述如下：本儀表配有兩個鉗口：電壓鉗和電流鉗。</span><br /><span style="font-family:宋體; font-size:12px">如圖2所示，電壓鉗在被測回路中激勵出一個感應電勢E，并在被測回路產(chǎn)生電流I，儀表通過電流鉗可以測得I值。通過對E、I的測量，由歐姆定律：R=E/I，即可求得R的值。</span><br /><img alt="" src="http://i01.yizimg.com/ComFolder/586162/201403/%E6%88%AA%E5%9B%BE20140321104805.jpg" style="height:auto; margin:0px auto 5px !important; width:178px" /><br /><span style="font-family:宋體; font-size:12px">圖2 測量原理</span><br /><span style="font-family:宋體; font-size:12px">2、多極并聯(lián)接地電阻的測量</span><br /><span style="font-family:宋體; font-size:12px">對多點接地系統(tǒng)（例如輸電系統(tǒng)桿塔接地、通信電纜接地系統(tǒng)、某些建筑物等），它們通過架空地線（通信電纜的屏蔽層）連接，組成了接地系統(tǒng)。如圖3所示：</span><br /><br /><img alt="" src="http://i01.yizimg.com/ComFolder/586162/201403/%E6%88%AA%E5%9B%BE20140321104825.jpg" style="height:auto; margin:0px auto 5px !important; width:474px" /><br /><span style="font-family:宋體; font-size:12px">圖3 多點接地系統(tǒng)地阻的測量</span><br /><span style="font-family:宋體; font-size:12px">當用鉗表將兩個鉗口鉗入被測接地線上，兩個鉗口的間距為30cm左右，發(fā)射鉗夾插入“發(fā)射”航插孔，接收鉗夾插入“接收”航插孔，兩航插孔不可互換，（如上圖測量時），其等效電路見下圖。</span><br /><img alt="" src="http://i01.yizimg.com/ComFolder/586162/201403/%E6%88%AA%E5%9B%BE20140321104856.jpg" style="height:auto; margin:0px auto 5px !important; width:229px" /><br /><span style="font-family:宋體; font-size:12px">則RT =Rx+ R0</span><br /><span style="font-family:宋體; font-size:12px">其中：</span><br /><span style="font-family:宋體; font-size:12px">RT：儀表測量出的值</span><br /><span style="font-family:宋體; font-size:12px">Rx：待測接地電阻</span><br /><span style="font-family:宋體; font-size:12px">R0：所有其它桿塔的接地電阻并聯(lián)后的等效電阻。</span><br /><span style="font-family:宋體; font-size:12px">雖然，從嚴格的接地理論來說，由于有所謂的“互電阻”的存在，R0并不是通常的電工學意義上的并聯(lián)值（它會比電工學意義上的并聯(lián)值稍大），但是，由于每一個桿塔的接地半球比起桿塔之間的距離要小得多，而且畢竟接地點數(shù)量很大，R0要比R1小得多。因此，可以從工程角度有理由地假設R0=0。這樣，我們所測的電阻就應該是RX了，即RT≈Rx。</span><br /><span style="font-family:宋體; font-size:12px">多次不同環(huán)境、不同場合下與傳統(tǒng)方法進行對比試驗，證明上述假設是*合理的。</span><br /><span style="font-family:宋體; font-size:12px">非接觸測量法（即雙鉗法）是一種*的測量技術，具有諸多優(yōu)點。不過，測試儀測得的電阻是包括被測接地電阻在內(nèi)的整個回路的電阻。使用中必須牢記這一點，以利對測量結果的分析。</span><br /><span style="font-family:宋體; font-size:12px">注意：發(fā)射鉗夾，接收鉗夾不可互換。</span><br /><span style="font-family:宋體; font-size:12px">3、雙鉗法測獨立接地體的方法</span><br /><span style="font-family:宋體; font-size:12px">a、雙鉗法在測試過程中，一定要有一個有效的閉合回路。解決的辦法是找一個輔助接電極，將被測接地體與接地良好的輔助地（如自來水管等）用連接線連在一起，將二個鉗口鉗入連接線上，（圖5所示）：二者間距30cm左右，此時按“雙鉗”鍵，進行雙鉗法測量界面，再按“測試”鍵直接顯示測量結果。測試獨立接地體接地電阻時可根據(jù)不同的情況采用不同的測試方法。</span><br /><span style="font-family:宋體; font-size:12px">b、當機房處于低樓層時（一、二層）可采用地樁測試方法，直接測出接地電阻。</span><br /><span style="font-family:宋體; font-size:12px">機房處于較高樓層時，（二層以上），可采用“獨立接地體”測試方法此種方法是基于將自來水管網(wǎng)的接地電阻理論上認為是零歐姆，但實際上是有電阻值的，此時測試分為二步：*步，按“獨立接地體”測試方法測出RA；第二步，單獨在一樓將自來水管的接地電阻按“地樁”測試方法測出RB（此時自來水管看作獨立接地體），（RA－RB）即為機房接地裝置的實際接地電阻。 </span><br /><br /><img alt="" src="http://i01.yizimg.com/ComFolder/586162/201403/%E6%88%AA%E5%9B%BE20140321104919.jpg" style="height:auto; margin:0px auto 5px !important; width:415px" /><br /><br /><span style="font-family:宋體; font-size:12px">圖5 獨立接地體地阻測量</span><br /><span style="font-family:宋體; font-size:12px">雙鉗法測電阻時，如果測量值顯示溢出，則說明被測電阻已超過本儀表的測量范圍或說明鉗口沒有鉗繞任何金屬導體或被測接地線。</span><br /><span style="font-family:宋體; font-size:12px">㈡、地樁法</span><br /><span style="font-family:宋體; font-size:12px">采用圖6的連接方法。此時按“地樁”鍵，進入地樁法測試界面。再按“測試”鍵可更地測量出被測接地體的接地電阻值。</span><br /><img alt="" src="http://i01.yizimg.com/ComFolder/586162/201403/%E6%88%AA%E5%9B%BE20140321104944.jpg" style="height:auto; margin:0px auto 5px !important; width:303px" /><br /><span style="font-family:宋體; font-size:12px">㈢、存儲</span><br /><span style="font-family:宋體; font-size:12px">每次測量后，可存貯測量結果。按左移鍵或右移鍵，將光標停在“存儲”上，按“確認”鍵進入存儲功能。輸入要存儲或查看的目號，然后按“確認”即可存儲，例如要將測量數(shù)據(jù)存儲到第7組內(nèi)，則將目號調(diào)整至007。再按“確認”鍵，進行確認，即可完成存儲。如該目號已存有數(shù)據(jù)，則原數(shù)據(jù)被覆蓋。繼續(xù)測試，按“確認”鍵，返回測試狀態(tài)。本機可存儲200組數(shù)據(jù)。</span><br /><span style="font-family:宋體; font-size:12px">㈣、查看/刪除</span><br /><span style="font-family:宋體; font-size:12px">在雙鉗法和地樁法測試界面，將光標移到“返回”上，再按“確認”鍵，即右進入主菜單，再按“▲”“▼”鍵，選擇 “查看歷史數(shù)據(jù)”或“刪除歷史數(shù)據(jù)”。再按“確認”鍵，進入相應的功能。按“” “”左右調(diào)整，按“▲” 、“▼”調(diào)整數(shù)字，按“確認”鍵進行確認，即可查閱存儲數(shù)值或刪除存儲的數(shù)值。</span><br /><span style="font-family:宋體; font-size:12px">㈤、保持</span><br /><span style="font-family:宋體; font-size:12px">在雙鉗法，地樁法測試過程中，由于環(huán)境影響及外界干擾等因素，可能會出現(xiàn)數(shù)值不穩(wěn)定的現(xiàn)象。在雙鉗法、地樁法測試界面，當光標停留在“保持”上時可以按“確認”鍵對測量數(shù)值進行鎖定，便于測量者進行記錄和讀取數(shù)值。此時屏幕上“保持”變?yōu)?ldquo;解除”，再按一下“確認”即可解除鎖定功能。</span></p> </div> <div id="5hlvxzllpl3" class="pagetb"> <p> 上一條：<a 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