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data-config="" data-state="true"> <div id="pr3mjyzo" class="appMask"></div> <div id="pr3mjyzo" class="appContent"> <div id="pr3mjyzo" class="datum_info"> <h1 class="title">鉗形接地電阻測試儀現(xiàn)場應用</h1> <div id="pr3mjyzo" class="bgcolor_01"> <div id="pr3mjyzo" class="bgcolor_sum"> <div id="pr3mjyzo" class="left">日期：2024-11-18 10:33</div> <div id="pr3mjyzo" class="right">瀏覽次數(shù)：96</div> </div> <div id="pr3mjyzo" class="bgcolor_sum01"> 摘要：上海康登電氣科技有限公司電力技術(shù) </div> </div> <div id="pr3mjyzo" class="content"> <p style="margin-top:0px;margin-bottom:0px;margin-left:52px;padding:0px;font-family:"PingFang SC", Helvetica, "Microsoft YaHei", Arial, sans-serif;font-size:14px;"> <strong><span style="font-family:黑體;font-size:19px;">鉗形接地電阻測試儀現(xiàn)場應用</span></strong> </p> <p style="margin-top:0px;margin-bottom:0px;padding:0px;font-family:"PingFang SC", Helvetica, "Microsoft YaHei", Arial, sans-serif;font-size:14px;"> <strong><span style="font-family:黑體;font-size:19px;">1．鉗形接地電阻測試儀多點接地系統(tǒng)</span></strong> </p> <p style="margin-top:0px;margin-bottom:0px;padding:0px;font-family:"PingFang SC", Helvetica, "Microsoft YaHei", Arial, sans-serif;font-size:14px;text-indent:37px;line-height:24px;"> <span style="font-family:宋體;font-size:19px;">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)。見下圖。當用鉗表測量時，其等效電路如下：</span> </p> <p style="margin-top:0px;margin-bottom:0px;padding:0px;font-family:"PingFang SC", Helvetica, "Microsoft YaHei", Arial, sans-serif;font-size:14px;"> <br> </p> <p style="margin-top:0px;margin-bottom:0px;padding:0px;font-family:"PingFang SC", Helvetica, "Microsoft YaHei", Arial, sans-serif;font-size:14px;"> <img src="https://img63.chem17.com/9/20221105/638032380803913424130.png" title="JW38FW5KO465MUP4U`K0HYP.png" alt="JW38FW5KO465MUP4U`K0HYP.png" style="margin:0px;padding:0px;max-height:100%;"> </p> <p style="margin-top:0px;margin-bottom:0px;padding:0px;font-family:"PingFang SC", Helvetica, "Microsoft YaHei", Arial, sans-serif;font-size:14px;text-indent:37px;line-height:24px;"> <span style="font-family:宋體;font-size:19px;">其中：R1為預測的接地電阻。</span> </p> <p style="margin-top:0px;margin-bottom:0px;padding:0px;font-family:"PingFang SC", Helvetica, "Microsoft YaHei", Arial, sans-serif;font-size:14px;text-indent:93px;line-height:24px;"> <span style="font-family:宋體;font-size:19px;">R0為所有其它桿塔的接地電阻并聯(lián)后的等效電阻。</span> </p> <p style="margin-top:0px;margin-bottom:0px;padding:0px;font-family:"PingFang SC", Helvetica, "Microsoft YaHei", Arial, sans-serif;font-size:14px;text-indent:37px;line-height:24px;"> <span style="font-family:宋體;font-size:19px;">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R1了。</span> </p> <p style="margin-top:0px;margin-bottom:0px;padding:0px;font-family:"PingFang SC", Helvetica, "Microsoft YaHei", Arial, sans-serif;font-size:14px;text-indent:37px;line-height:24px;"> <span style="font-size:19px;font-family:宋體;">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</span><span style="font-size:18px;">合理的</span>。 </p> <p style="margin-top:0px;margin-bottom:0px;padding:0px;font-family:"PingFang SC", Helvetica, "Microsoft YaHei", Arial, sans-serif;font-size:14px;line-height:24px;"> <strong><span style="font-family:黑體;font-size:19px;">2．鉗形接地電阻測試儀有限點接地系統(tǒng)</span></strong><strong></strong> </p> <p style="margin-top:0px;margin-bottom:0px;padding:0px;font-family:"PingFang SC", Helvetica, "Microsoft YaHei", Arial, sans-serif;font-size:14px;text-indent:37px;line-height:24px;"> <span style="font-family:宋體;font-size:19px;">這種情況也較普遍。例如有些桿塔是5個桿塔通過架空地線彼此相連；再如某些建筑物的接地也不是一個獨立的接地網(wǎng)，而是幾個接地體通過導線彼此連接。</span><span style="font-family:宋體;font-size:19px;"><br style="clear:both;"> </span><span style="font-family:宋體;font-size:19px;"> 在這種情況下，如果將上圖中的R0視為0則會對測量結(jié)果帶來較大誤差。</span><span style="font-family:宋體;font-size:19px;"><br style="clear:both;"> </span><span style="font-family:宋體;font-size:19px;"> 出于與上述同樣的理由，我們忽略互電阻的影響，將接地電阻的并聯(lián)后的等效電阻按通常意義上的計算方法計算。這樣，對于N個（N較小，但大于2）接地體的接地系統(tǒng)，就可以列出N個方程：</span> </p> <p style="margin-top:0px;margin-bottom:0px;padding:0px;font-family:"PingFang SC", Helvetica, "Microsoft YaHei", Arial, sans-serif;font-size:14px;text-indent:37px;line-height:24px;"> <span style="font-family:宋體;font-size:19px;"></span> </p> <p style="margin-top:0px;margin-bottom:0px;padding:0px;font-family:"PingFang SC", Helvetica, "Microsoft YaHei", Arial, sans-serif;font-size:14px;text-indent:37px;"> <span style="font-family:宋體;font-size:19px;"><br style="clear:both;"> </span> </p> <p style="margin-top:0px;margin-bottom:0px;padding:0px;font-family:"PingFang SC", Helvetica, "Microsoft YaHei", Arial, sans-serif;font-size:14px;text-indent:37px;"> <span style="font-family:宋體;font-size:19px;"><br style="clear:both;"> </span> </p> <p style="margin-top:0px;margin-bottom:0px;padding:0px;font-family:"PingFang SC", Helvetica, "Microsoft YaHei", Arial, sans-serif;font-size:14px;text-indent:37px;"> <img src="https://img61.chem17.com/9/20221105/638032381614838324590.png" title="2LKX0})N6IZ8OMWP2[[NWW8.png" alt="2LKX0})N6IZ8OMWP2[[NWW8.png" style="margin:0px;padding:0px;max-height:100%;text-indent:28px;"><span style="font-family:宋體;font-size:19px;"><br style="clear:both;"> </span> </p> <p style="margin-top:0px;margin-bottom:0px;padding:0px;font-family:"PingFang SC", Helvetica, "Microsoft YaHei", Arial, sans-serif;font-size:14px;text-indent:37px;"> <span style="font-family:宋體;font-size:19px;">其中：R1、R2、…….RN是我們要求得的N個接地體的接地電阻。</span> </p> <p style="margin-top:0px;margin-bottom:0px;padding:0px;font-family:"PingFang SC", Helvetica, "Microsoft YaHei", Arial, sans-serif;font-size:14px;text-indent:93px;"> <span style="font-family:宋體;font-size:19px;">R1T、R2T、……RNT分別是用鉗表在各接地支路所測得的電阻。</span><span style="font-family:宋體;font-size:19px;"><br style="clear:both;"> </span><span style="font-family:宋體;font-size:19px;"> 這是一個有N個未知數(shù)，N個方程的非線性方程組。它是有確定解的，但是人工解它是十分困難的，當N較大時甚至是不可能的。</span><span style="font-family:宋體;font-size:19px;"><br style="clear:both;"> </span><span style="font-family:宋體;font-size:19px;"> 為此，請選購我公司的有限點接地系統(tǒng)解算程序軟件，用戶即可使用辦公電腦或手提電腦進行機解。</span><span style="font-family:宋體;font-size:19px;"><br style="clear:both;"> </span><span style="font-family:宋體;font-size:19px;"> 從原理上來說，除了忽略互電阻以外，這種方法不存在忽略R0所帶來的測量誤差。</span><span style="font-family:宋體;font-size:19px;"><br style="clear:both;"> </span><span style="font-family:宋體;font-size:19px;"> 但是，用戶需要注意的是：您的接地系統(tǒng)中，有幾個彼此相連接的接地體，就必須測量出同樣個數(shù)的測試值供程序解算，不能或多或少。而程序也是輸出同樣個數(shù)的接地電阻值。</span> </p> <p style="margin-top:0px;margin-bottom:0px;padding:0px;font-family:"PingFang SC", Helvetica, "Microsoft YaHei", Arial, sans-serif;font-size:14px;line-height:24px;"> <strong><span style="font-family:黑體;font-size:19px;">2．鉗形接地電阻測試儀單點接地系統(tǒng)</span></strong><strong></strong> </p> <p style="margin-top:0px;margin-bottom:0px;padding:0px;font-family:"PingFang SC", Helvetica, "Microsoft YaHei", Arial, sans-serif;font-size:14px;text-indent:37px;"> <span style="font-family:宋體;font-size:19px;">從測試原理來說，鉗表只能測量回路電阻，對單點接地是測不出來的。但是，用戶可以利用一根測試線及接地系統(tǒng)附近的接地極，人為地制造一個回路進行測試。下面介紹二種用鉗表測量單點接地的方法，此方法可應用于傳統(tǒng)的電壓-電流法無法測試的場合。</span> </p> <p style="margin-top:0px;margin-bottom:0px;padding:0px;font-family:"PingFang SC", Helvetica, "Microsoft YaHei", Arial, sans-serif;font-size:14px;text-indent:37px;"> <strong><span style="font-family:黑體;font-size:19px;">⑴．二點法</span></strong><strong></strong> </p> <p style="margin-top:0px;margin-bottom:0px;padding:0px;font-family:"PingFang SC", Helvetica, "Microsoft YaHei", Arial, sans-serif;font-size:14px;text-indent:37px;"> <span style="font-family:宋體;font-size:19px;">見下圖，在被測接地體RA附近找一個獨立的接地較好的接地體RB（例如臨近的自來水管、建筑物等）。將RA和RB用一根測試線連接起來。</span> </p> <p style="margin-top:0px;margin-bottom:0px;padding:0px;font-family:"PingFang SC", Helvetica, "Microsoft YaHei", Arial, sans-serif;font-size:14px;text-indent:28px;"> <span style="font-family:宋體;font-size:19px;"> </span> </p> <p style="margin-top:0px;margin-bottom:0px;padding:0px;font-family:"PingFang SC", Helvetica, "Microsoft YaHei", Arial, sans-serif;font-size:14px;text-indent:37px;"> <span style="font-family:宋體;font-size:19px;"> </span> </p> <p style="margin-top:0px;margin-bottom:0px;padding:0px;font-family:"PingFang SC", Helvetica, "Microsoft YaHei", Arial, sans-serif;font-size:14px;text-indent:37px;"> <span style="font-family:宋體;font-size:19px;"> <img src="https://img61.chem17.com/9/20221105/638032382114815528357.png" title="J~C{4T74I@RKF4`OQ9$_C62.png" alt="J~C{4T74I@RKF4`OQ9$_C62.png" style="margin:0px;padding:0px;max-height:100%;"></span> </p> <p style="margin-top:0px;margin-bottom:0px;padding:0px;font-family:"PingFang SC", Helvetica, "Microsoft YaHei", Arial, sans-serif;font-size:14px;text-indent:37px;"> <span style="font-family:宋體;font-size:19px;"> </span> </p> <p style="margin-top:0px;margin-bottom:0px;padding:0px;font-family:"PingFang SC", Helvetica, "Microsoft YaHei", Arial, sans-serif;font-size:14px;"> <span style="font-family:宋體;font-size:19px;"> </span> </p> <p style="margin-top:0px;margin-bottom:0px;padding:0px;font-family:"PingFang SC", Helvetica, "Microsoft YaHei", Arial, sans-serif;font-size:14px;text-indent:37px;"> <span style="font-family:宋體;font-size:19px;">由于鉗表所測的阻值是兩個接地電阻和測試線阻值的串聯(lián)值。</span> </p> <p style="margin-top:0px;margin-bottom:0px;padding:0px;font-family:"PingFang SC", Helvetica, "Microsoft YaHei", Arial, sans-serif;font-size:14px;text-indent:37px;"> <span style="font-family:宋體;font-size:19px;">RT=RA+RB+RL</span> </p> <p style="margin-top:0px;margin-bottom:0px;padding:0px;font-family:"PingFang SC", Helvetica, "Microsoft YaHei", Arial, sans-serif;font-size:14px;"> <span style="font-family:宋體;font-size:19px;"> 其中：RT為鉗表所測的阻值。</span> </p> <p style="margin-top:0px;margin-bottom:0px;padding:0px;font-family:"PingFang SC", Helvetica, "Microsoft YaHei", Arial, sans-serif;font-size:14px;text-indent:37px;"> <span style="font-family:宋體;font-size:19px;">RL為測試線的阻值。</span> </p> <p style="margin-top:0px;margin-bottom:0px;padding:0px;font-family:"PingFang SC", Helvetica, "Microsoft YaHei", Arial, sans-serif;font-size:14px;text-indent:37px;"> <span style="font-family:宋體;font-size:19px;">將測試線頭尾相連即可用鉗表測出其阻值RL。</span> </p> <p style="margin-top:0px;margin-bottom:0px;padding:0px;font-family:"PingFang SC", Helvetica, "Microsoft YaHei", Arial, sans-serif;font-size:14px;"> <span style="font-family:宋體;font-size:19px;">所以，如果鉗表的測量值小于接地電阻的允許值，那么這兩個接地體的接地電阻都是合格的。</span><span style="font-family:宋體;font-size:19px;"><br style="clear:both;"> </span> </p> <p style="margin-top:0px;margin-bottom:0px;padding:0px;font-family:"PingFang SC", Helvetica, "Microsoft YaHei", Arial, sans-serif;font-size:14px;text-indent:37px;line-height:24px;"> <span style="font-family:宋體;font-size:19px;"><br style="clear:both;"> </span> </p> <p style="margin-top:0px;margin-bottom:0px;padding:0px;font-family:"PingFang SC", Helvetica, "Microsoft YaHei", Arial, sans-serif;font-size:14px;text-indent:37px;"> <span style="font-family:宋體;font-size:19px;">阻都是合格的。</span><span style="font-family:宋體;font-size:19px;"><br style="clear:both;"> </span><span style="font-family:黑體;"> </span><strong><span style="font-family:黑體;font-size:19px;"> ⑵．鉗形接地電阻測試儀三點法</span></strong> </p> <p style="margin-top:0px;margin-bottom:0px;padding:0px;font-family:"PingFang SC", Helvetica, "Microsoft YaHei", Arial, sans-serif;font-size:14px;text-indent:37px;"> <span style="font-family:宋體;font-size:19px;">如下圖，在被測接地體RA附近找二個獨立的接地體RB和RC。</span> </p> <p style="margin-top:0px;margin-bottom:0px;padding:0px;font-family:"PingFang SC", Helvetica, "Microsoft YaHei", Arial, sans-serif;font-size:14px;text-indent:37px;"> <span style="font-family:宋體;font-size:19px;">**步，將RA和RB用一根測試線連接起來，見下圖。用鉗表讀得**個數(shù)據(jù)R1。</span> </p> <p style="margin-top:0px;margin-bottom:0px;padding:0px;font-family:"PingFang SC", Helvetica, "Microsoft YaHei", Arial, sans-serif;font-size:14px;text-indent:37px;"> <span style="font-family:宋體;font-size:19px;"><img src="https://img66.chem17.com/9/20221105/638032384287057430273.png" title="O[BA01)OSK4ZGUFXFJV5BWP.png" alt="O[BA01)OSK4ZGUFXFJV5BWP.png" width="1" height="1" style="margin:0px;padding:0px;max-height:100%;width:1px;height:1px;"><img src="https://img63.chem17.com/9/20221105/638032384662612479424.png" title="O[BA01)OSK4ZGUFXFJV5BWP.png" alt="O[BA01)OSK4ZGUFXFJV5BWP.png" style="margin:0px;padding:0px;max-height:100%;"></span> </p> <p style="margin-top:0px;margin-bottom:0px;padding:0px;font-family:"PingFang SC", Helvetica, "Microsoft YaHei", Arial, sans-serif;font-size:14px;text-indent:37px;"> <span style="font-family:宋體;font-size:19px;"><br style="clear:both;"> </span> </p> <p style="margin-top:0px;margin-bottom:0px;padding:0px;font-family:"PingFang SC", Helvetica, "Microsoft YaHei", Arial, sans-serif;font-size:14px;text-indent:37px;"> <span style="font-family:宋體;font-size:19px;"><br style="clear:both;"> </span> </p> <p style="margin-top:0px;margin-bottom:0px;padding:0px;font-family:"PingFang SC", Helvetica, "Microsoft YaHei", Arial, sans-serif;font-size:14px;text-indent:37px;"> <br> </p> <p style="margin-top:0px;margin-bottom:0px;padding:0px;font-family:"PingFang SC", Helvetica, "Microsoft YaHei", Arial, sans-serif;font-size:14px;text-indent:37px;line-height:24px;"> <span style="font-family:宋體;font-size:19px;">上面三步中，每一步所測得的讀數(shù)都是兩個接地電阻的串聯(lián)值。這樣，就可以很容易地計算出每一個接地電阻值：</span> </p> <p style="margin-top:0px;margin-bottom:0px;padding:0px;font-family:"PingFang SC", Helvetica, "Microsoft YaHei", Arial, sans-serif;font-size:14px;text-indent:37px;line-height:24px;"> <span style="font-family:宋體;font-size:19px;">由于： R1=RA+RB R2=RB+RC R3=RC+RA</span> </p> <p style="margin-top:0px;margin-bottom:0px;padding:0px;font-family:"PingFang SC", Helvetica, "Microsoft YaHei", Arial, sans-serif;font-size:14px;text-indent:37px;line-height:24px;"> <span style="font-family:宋體;font-size:19px;">所以： RA=（R1+R3-R2）÷2</span> </p> <p style="margin-top:0px;margin-bottom:0px;padding:0px;font-family:"PingFang SC", Helvetica, "Microsoft YaHei", Arial, sans-serif;font-size:14px;text-indent:37px;"> <span style="font-family:宋體;font-size:19px;">這就是接地體RA的接地電阻值。為了便于記憶上述公式，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減對邊電阻除2。</span> </p> <p style="margin-top:0px;margin-bottom:0px;padding:0px;font-family:"PingFang SC", Helvetica, "Microsoft YaHei", Arial, sans-serif;font-size:14px;text-indent:37px;line-height:24px;"> <span style="font-family:宋體;font-size:19px;">其它兩個作為參照物的接地體的接地電阻值為：</span> </p> <p style="margin-top:0px;margin-bottom:0px;padding:0px;font-family:"PingFang SC", Helvetica, "Microsoft YaHei", Arial, sans-serif;font-size:14px;text-indent:37px;"> <span style="font-family:宋體;font-size:19px;">RB=R1-RA RC=R3-RA</span> </p> </div> <div id="pr3mjyzo" class="datumrelate"> <span>下一篇：</span> <a href="/kangdengdq_Article_11750639.html" title="發(fā)電機表面電位測試儀使用方法">發(fā)電機表面電位測試儀使用方法</a> <br> <span>上一篇：</span> <a href="/kangdengdq_Article_11750649.html" title=" 康登回路電阻測試儀的接線方法是怎樣的"> 康登回路電阻測試儀的接線方法是怎樣的</a> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> <footer id="footer" class="footer" data-appid="layout"> <div class="pr3mjyzo" id="footerWrapper" class="footerWrapper" data-appid="wrapper"> <div class="pr3mjyzo" id="footerContainer" class="footerContainer" data-appid="container"> <div id="pr3mjyzo" class="row" role="draggable" data-appid="row" id="layout_31454041"> <div id="pr3mjyzo" class="rowPatch"> 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