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<p>環(huán)路電阻測試儀和鉗形接地電阻測試儀<br/></p><p><strong style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);">1．環(huán)路電阻測試儀多點接地系統(tǒng)</strong><br style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"/><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; font-family: arial;">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></span><br style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"/><img alt="鉗形接地電阻測試儀多點接地法" src="http://www.yzceshi.com/Upload/Pic/20155261115462.png" style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; padding: 0px; border: 0px; vertical-align: middle; max-height: 100%; max-width: 100%; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"/><br style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"/><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; font-family: arial;">其中：R1為預測的接地電阻。</span></span><br style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"/><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; font-family: arial;">R0為所有其它桿塔的接地電阻并聯(lián)后的等效電阻。</span></span><br style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"/><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; font-family: arial;">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></span><br style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"/><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; font-family: arial;">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></span><br style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"/><strong style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);">2．環(huán)路電阻測試儀有限點接地系統(tǒng)</strong><br style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"/><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; font-family: arial;">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><br style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"/><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; font-family: arial;"> 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><br style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"/><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; font-family: arial;"> 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></span><br style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"/><img alt="鉗形接地電阻測試儀計算公式" src="http://www.yzceshi.com/Upload/Pic/201552611246963.png" style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; padding: 0px; border: 0px; vertical-align: middle; max-height: 100%; max-width: 100%; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"/><br style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"/><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; font-family: arial;">其中：R1、R2、…….RN是我們要求得的N個接地體的接地電阻。</span></span><br style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"/><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; font-family: arial;">R1T、R2T、……RNT分別是用鉗表在各接地支路所測得的電阻。</span></span><br style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"/><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; font-family: arial;"> 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><br style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"/><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; font-family: arial;"> 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><br style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"/><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; font-family: arial;"> 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><br style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"/><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; font-family: arial;"> 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></span><br style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"/><strong style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);">3.環(huán)路電阻測試儀單點接地系統(tǒng)</strong><br style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"/><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; font-family: arial;">從測試原理來說，ETCR系列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></span><br style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"/><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; font-family: arial;">⑴．二點法</span></span><br style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"/><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; font-family: arial;">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></span><br style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"/><img alt="二點法" src="http://www.yzceshi.com/Upload/Pic/201552611630771.png" style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; padding: 0px; border: 0px; vertical-align: middle; max-height: 100%; max-width: 100%; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"/><br style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"/><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; font-family: arial;">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></span><br style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"/><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; font-family: arial;">RT=RA+RB+RL</span></span><br style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"/><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; font-family: arial;"> 其中：RT為鉗表所測的阻值。</span></span><br style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"/><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; font-family: arial;">RL為測試線的阻值。</span></span><br style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"/><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; font-family: arial;">將測試線頭尾相連即可用鉗表測出其阻值RL。</span></span><br style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"/><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; font-family: arial;">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><br style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"/><strong style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);">⑵．環(huán)路電阻測試儀三點法</strong><br style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"/><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; font-family: arial;">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></span><br style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"/><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; font-family: arial;">*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></span><br style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"/><img alt="三點法" src="http://www.yzceshi.com/Upload/Pic/201552611717792.png" style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; padding: 0px; border: 0px; vertical-align: middle; max-height: 100%; max-width: 100%; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"/><br style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"/><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; font-family: arial;">第二步，將RB和RC連接起來，見下圖。用鉗表讀得第二個數(shù)據(jù)R2。</span></span><br style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"/><img alt="鉗形接地電阻測試儀三點法" src="http://www.yzceshi.com/Upload/Pic/201552611852873.png" style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; padding: 0px; border: 0px; vertical-align: middle; max-height: 100%; max-width: 100%; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"/><br style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"/><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; font-family: arial;">第三步，將RC和RA連接起來，見下圖。用鉗表讀得第三個數(shù)據(jù)R3。</span></span><br style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"/><img alt="鉗形接地電阻測試儀使用方法" src="http://www.yzceshi.com/Upload/Pic/201552611945708.png" style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; padding: 0px; border: 0px; vertical-align: middle; max-height: 100%; max-width: 100%; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"/><br style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"/><br style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"/><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; font-family: arial;">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></span><br style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"/><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; font-family: arial;">由于： R1=RA+RB R2=RB+RC R3=RC+RA</span></span><br style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"/><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; font-family: arial;">所以： RA=（R1+R3-R2）÷2</span></span><br style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"/><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; font-family: arial;">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></span><br style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"/><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; font-family: arial;">其它兩個作為參照物的接地體的接地電阻值為：</span></span><br style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"/><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; font-family: arial;">RB=R1-RA RC=R3-RA</span></span><br style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"/><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; font-family: arial;">鉗形接地電阻測試儀電阻測量原理:</span></span><br style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"/><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; font-family: arial;">鉗形接地電阻儀測量接地電阻的基本原理是測量回路電阻。鉗表的鉗口部分由電壓線圈及電流線圈組成。電壓線圈提供激勵信號，并在被測回路上感應一個電勢E。</span></span><br style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"/><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; color: rgb(51, 51, 51); font-family: "microsoft yahei"; background-color: rgb(255, 255, 255);"><span style="-webkit-tap-highlight-color: transparent; -webkit-appearance: none; margin: 0px; font-family: arial;">在電勢E的作用下將在被測回路產(chǎn)生電流I。鉗表對E及I進行測量，并通過下面的公式即可得到被測電阻R。R=E/I</span></span><br/></p> </div> <div id="5hlvxzllpl3" class="pagetb"> <p> 上一條：<a href="/Article-3001566.html">智能型異頻大地網(wǎng)接地阻抗測試儀技術參數(shù)</a></p> <p> 下一條：<a href="/Article-3001553.html">如何選購“環(huán)路電阻測試儀”？【上海康登電氣】</a></p> </div> </div> </div> </div> <div id="5hlvxzllpl3" class="footer"> <div id="5hlvxzllpl3" class="foot"> <p>Copyright © 2024 上?？档请姎饪萍加邢薰?版權所有 <a target="_blank" rel="nofollow">備案號：滬ICP備16026206號-4</a> 傳真：86-021-51714615<br /> 技術支持：<a target="_blank" rel="nofollow">化工儀器網(wǎng)</a> <a href="/sitemap.xml" target="_blank" >sitemap.xml</a> <a target="_blank" rel="nofollow">管理登陸</a> 總流量：370178<br /> 上?？档请姎饪萍加邢薰荆╳ww.laoge123.net.cn）主營：<strong><a href="/">ET3000雙鉗形接地電阻測試儀</a></strong>|<strong><a href="/">ZSR10A直流電阻測試儀</a></strong>|<strong><a href="/">SXJS-IV智能介質(zhì)損耗測試儀</a></strong>|<strong><a href="/">SX-9000全自動油介質(zhì)損耗測試儀</a></strong><br /> </p> </div> </div> <div class="5hlvxzllpl3" 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