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class="inside_rnewcon"><p style="margin: 2px 0px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體;"><font style="font-size: 15px; margin: 0px; padding: 0px;"><font color="#181818"> 一、</font><span style="border:0px; color:rgb(24, 24, 24); font:inherit; margin:0px; padding:0px">鉗形地阻表</span><font color="#181818">測(cè)量原理接地電阻測(cè)試儀　　</font><span style="border:0px; color:rgb(24, 24, 24); font:inherit; margin:0px; padding:0px">鉗形地阻表</span><font color="#181818">是一種新穎的測(cè)量工具,它方便、快捷,外形酷似鉗形電流表,測(cè)試時(shí)不需輔助測(cè)試樁,只需往被測(cè)地線上一夾,幾秒鐘即可獲得測(cè)量結(jié)果</font><span style="color:#000000">,daidai</span><font color="#181818">地方便了地阻測(cè)量工作。鉗形地阻表還有一個(gè)很大的優(yōu)點(diǎn)是可以對(duì)在用設(shè)備的地阻進(jìn)行在線測(cè)量,而不需切斷設(shè)備電源或斷開地線?！?nbsp;</font><br /><font color="#181818"> 電路中Ｅ和Ｉ旁的圓環(huán)表示鉗形地阻表的環(huán)形卡口,Ｒｘ為被測(cè)地線樁的地阻,Ｒ１、Ｒ２．．．Ｒｎ為分布式接地系統(tǒng)中其它接地點(diǎn)的地阻。該圖可以進(jìn)一步等效為圖３。測(cè)量時(shí),鉗形地阻表利用電磁感應(yīng)原理通過其前端卡口（內(nèi)有電磁線圈）所構(gòu)成的環(huán)向被測(cè)線纜送入一恒定電壓Ｅ,該電壓被施加在圖３所示的回路中,地阻表可同時(shí)通過其前端卡口測(cè)出回路中的電流Ｉ,根據(jù)Ｅ和Ｉ,即可計(jì)算出回路中的總電阻,即：　?。牛桑剑遥?１／（１／Ｒ１＋１／Ｒ２＋．．．＋１／Ｒｎ）</font><br /><font color="#181818">　?。保ǎ保遥保保遥玻?．．．＋１／Ｒｎ）為Ｒ１、Ｒ２．．．Ｒｎ并聯(lián)后的總電阻　　在分布式多點(diǎn)接地系統(tǒng)中,通常有Ｒｘ＞＞１／（１／Ｒ１＋１／Ｒ２＋．．．＋１／Ｒｎ）, “＞＞”意為“遠(yuǎn)遠(yuǎn)大于”假設(shè)上述條件成立,則被測(cè)地阻Ｒｘ＝Ｅ／Ｉ。</font></font></p><p style="margin: 2px 0px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24);"><font style="font-size: 15px; margin: 0px; padding: 0px;"> 事實(shí)上,<span style="border:0px; font:inherit; margin:0px; padding:0px">鉗形地阻表</span>通過其前端卡環(huán)這一特殊的電磁變換器送入線纜的是１．７ｋＨｚ的交流恒定電壓,在電流檢測(cè)電路中,經(jīng)過濾波、放大、Ａ／Ｄ轉(zhuǎn)換,只有１．７ｋＨｚ的電壓所產(chǎn)生的電流被檢測(cè)出來。正因這樣,鉗形地阻表才排除了商用交流電和設(shè)備本身產(chǎn)生的高頻噪聲所帶來的地線上的微小電流,以獲得準(zhǔn)確的測(cè)量結(jié)果,也正因?yàn)槿绱?鉗形地阻表才具有了在線測(cè)量這一優(yōu)勢(shì)。實(shí)際上,該表測(cè)出的是整個(gè)回路的阻抗,而不是電阻,不過在通常情況下他們相差極小。鉗形地阻表可即刻將結(jié)果顯示在ＬＣＤ顯示屏上,當(dāng)卡口沒有卡好時(shí),它可在ＬＣＤ上顯示“ｏｐｅｎｊａｗ”或類似符號(hào)。<br /> 由于<span style="border:0px; font:inherit; margin:0px; padding:0px">鉗形地阻表</span>的特殊結(jié)構(gòu),使它可以很方便地作為電流表使用,很多這類儀表同時(shí)具有鉗形電流表的功能。另一方面,雖然鉗形地阻表測(cè)試時(shí)使用一定頻率的信號(hào)以排除干擾,但在被測(cè)線纜上有很大電流存在的情況下,測(cè)量也會(huì)受到干擾,導(dǎo)致結(jié)果不準(zhǔn)確。所以,按照要求,在使用時(shí)應(yīng)先測(cè)線纜上的電流,只有在電流不是非常大時(shí)才可進(jìn)一步測(cè)量地阻。有些儀表在測(cè)量地阻時(shí)自動(dòng)進(jìn)行噪聲干擾檢測(cè),當(dāng)干擾太大以致測(cè)量不能進(jìn)行時(shí)會(huì)給出提示。</font></p><p> <img alt="" src="http://img79.chem17.com/9/20201128/637421526071050895305.jpg" style="width:800px" /></p><p style="margin: 2px 0px; padding: 0px; border: 0px; font: inherit;"><br /> 二、<strong style="border:0px; font:inherit; margin:0px; padding:0px">鉗形地阻表</strong>測(cè)量注意事項(xiàng)<span> </span><br /> 從上面的介紹可以看出,<strong style="border:0px; font:inherit; margin:0px; padding:0px">鉗形地阻表</strong>和手搖式地阻表的測(cè)量原理*不同。手搖式地阻表在使用時(shí),應(yīng)將接地樁與設(shè)備斷開,以避免設(shè)備自身接地體影響測(cè)量的準(zhǔn)確性,手搖式地阻表可獲得較高的精度,而不管是單點(diǎn)接地和多點(diǎn)接地系統(tǒng)；對(duì)于鉗形地阻表,其<span style="color:#000000"><span id="nxnzvbt5" class="bjFfcClass">理想</span></span>的應(yīng)用是用在分布式多點(diǎn)接地系統(tǒng)中,此時(shí)應(yīng)對(duì)接地系統(tǒng)的所用接地樁依次進(jìn)行測(cè)量,并記錄下測(cè)量結(jié)果,然后進(jìn)行對(duì)比,對(duì)測(cè)量結(jié)果明顯大于其它各點(diǎn)的接地樁,要著重檢查,必要時(shí)將該地樁與設(shè)備斷開后用手搖式地阻表進(jìn)行復(fù)測(cè),以暴露出不良的接地樁。<br /> 在單點(diǎn)接地系統(tǒng)中應(yīng)慎用鉗形地阻表,從它的工作原理中可以看出：<strong style="border:0px; font:inherit; margin:0px; padding:0px">鉗形地阻表</strong>測(cè)出的電阻值是回路中的總電阻,只有Ｒｘ＞＞１／（１／Ｒ１＋１／Ｒ２＋．．．＋１／Ｒｎ）時(shí),該阻值才近似于我們要測(cè)的接地樁地阻,而這個(gè)條件,在很多情況下,尤其是在單點(diǎn)接地系統(tǒng)中是不滿足的。對(duì)于已埋設(shè)好而尚未與設(shè)備連接的開路接地樁,其地阻根本不能用該儀表進(jìn)行測(cè)量。</p></div> <div id="nxnzvbt5" class="inside_newsthree"> <p id="newsprev">上一篇：<b class="newsprev"><a href="/Article-2464559.html">工頻耐壓試驗(yàn)安全要注意的六點(diǎn)</a></b></p> <p id="newsnext">下一篇：<b class="newsnext"><a href="/Article-2454279.html">FRC-50KV阻容分壓器操作方法</a></b></p> <span><a href="/article.html">返回列表>></a></span> </div> </div> </div> </div> </div>    <div class="nxnzvbt5" id="z_Footer"> <div id="nxnzvbt5" class="pz_down"> <div id="nxnzvbt5" class="w_1200"> <div id="nxnzvbt5" class="footT"> <div id="nxnzvbt5" class="footAddr"> <div id="nxnzvbt5" class="footTit">上?？档请姎饪萍加邢薰?/div> <div id="nxnzvbt5" class="dAddr"><img class="ico" src="/Skins/334632/images/icon_foot1.png">地址：上海市普陀區(qū)金通路1118弄6號(hào)</div> <div id="nxnzvbt5" class="dAddr"><img class="ico" 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