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</script> </div>  <div id="f55nvtnxj1n" class="searchbox"> <form name="form1" method="post" action="/products.html" onsubmit="return checkform(form1)" class="input"> <input name="keyword" onblur="if(this.value=='')this.value='請輸入您要查詢的產(chǎn)品'" onfocus="this.value=''" value="請輸入您要查詢的產(chǎn)品" type="text" class="search-txt"> <input name="" type="submit" class="search-btn" value=""> </form> </div> <div id="f55nvtnxj1n" class="clear"></div> </div> </div> <div id="f55nvtnxj1n" class="nybanner"><img src="/skins/106676/images/nybanner.jpg"></div> <script src="http://www.chem17.com/mystat.aspx?u=mbdzkj"></script>  <div id="f55nvtnxj1n" class="ncontent w_1100"> <div id="f55nvtnxj1n" class="h-6">技術(shù)文章<span>您當(dāng)前的位置：<a href="/">首頁</a> > <a href="/article.html">技術(shù)文章</a> > 大地網(wǎng)接地電阻測試儀在變電站測試中</span></div>  <div id="f55nvtnxj1n" class="n-3 c-news"> <div id="f55nvtnxj1n" class="newsnr"> <h1>大地網(wǎng)接地電阻測試儀在變電站測試中</h1> <p class="source"><span>日期：2021-06-25</span><span>瀏覽：869次</span></p> <div> <p style="margin: 0px; padding: 0px; font-family: 宋體, Tahoma, Arial; font-size: 14px; text-align: center;"><strong style="font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 16px; line-height: 30px; font-family: 微軟雅黑;">大地網(wǎng)接地電阻測試儀在變電站測試中的使用圖解</strong></p><p style="margin: 0px; padding: 0px; font-family: 宋體, Tahoma, Arial; font-size: 14px; text-align: justify;"><span style="font-family: 微軟雅黑, "microsoft yahei"; font-size: 16px;"> 測試變電站接地裝置的接地阻抗時(shí)電流極要布置的盡量遠(yuǎn)，通常電流極與被試接地裝置邊緣的距離dCG應(yīng)為被試接地裝置Z大對角線長度D的4～5倍(平行布線法)，在土壤電阻率均勻的地區(qū)可取2倍及以上(三角形布線法)，電壓引線長度為電流引線長度0.618倍(平線布線法)或等于電流線(三角形布線法)。</span></p><p style="margin: 0px; padding: 0px; font-family: 宋體, Tahoma, Arial; font-size: 14px; text-align: justify;"><span style="font-family: 微軟雅黑, "microsoft yahei"; font-size: 16px;">　　1、電位降法</span></p><p style="margin: 0px; padding: 0px; font-family: 宋體, Tahoma, Arial; font-size: 14px; text-align: justify;"><span style="font-family: 微軟雅黑, "microsoft yahei"; font-size: 16px;">　　電位降法測試接地裝置的接地阻抗是按圖1布置測試回路，且符合測試回路的布置的要求。</span><span style="font-family: 微軟雅黑, "microsoft yahei"; font-size: inherit;">　　</span></p><p style="margin: 0px; padding: 0px; font-family: 宋體, Tahoma, Arial; font-size: 14px; text-align: center;"><img alt="大地網(wǎng)接地電阻測試儀在變電站測試中的使用圖解" src="https://www.wh-huayi.com/ueditor/php/upload/image/20200827/1598517644357542.jpg" style="margin: 0px; padding: 0px; border: 0px; max-width: 100%;" /></p><p style="margin: 0px; padding: 0px; font-family: 宋體, Tahoma, Arial; font-size: 14px; text-align: justify;"> </p><p style="margin: 0px; padding: 0px; font-family: 宋體, Tahoma, Arial; font-size: 14px; text-align: justify;"><span style="font-family: 微軟雅黑, "microsoft yahei"; font-size: 16px;">　　G—被試接地裝置;C—電流極;P—電位極;D—被試接地裝置大對角線長度;dCG—電流極與被試接地裝置邊緣的距離;x—電位極與被試接地裝置邊緣的距離;d—測試距離間隔;</span></p><p style="margin: 0px; padding: 0px; font-family: 宋體, Tahoma, Arial; font-size: 14px; text-align: justify;"><span style="font-family: 微軟雅黑, "microsoft yahei"; font-size: 16px;">　　圖1電位降法測試接地裝置的接地阻抗</span></p><p style="margin: 0px; padding: 0px; font-family: 宋體, Tahoma, Arial; font-size: 14px; text-align: justify;"><span style="font-family: 微軟雅黑, "microsoft yahei"; font-size: 16px;">　　流過被試接地裝置G和電流極C的電流I使地面電位變化，電位極P從G的邊緣開始沿與電流回路呈30°~45°的方向向外移動，每間隔d(50m或100m或200m)測試一次P與G之間的電位差U，繪出U與x的變化曲線。曲線平坦處即為電位零點(diǎn)，與曲線點(diǎn)間的電位即為在試驗(yàn)電流下被試接地裝置的電位升高U,接地裝置的接地阻抗為：Z=Um/I</span></p><p style="margin: 0px; padding: 0px; font-family: 宋體, Tahoma, Arial; font-size: 14px; text-align: justify;"><span style="font-family: 微軟雅黑, "microsoft yahei"; font-size: 16px;">　　如果電位測試線與電流線呈角度放設(shè)確實(shí)困難，可與之同路徑放設(shè)，但要保持盡量遠(yuǎn)的距離。</span></p><p style="margin: 0px; padding: 0px; font-family: 宋體, Tahoma, Arial; font-size: 14px; text-align: justify;"><span style="font-family: 微軟雅黑, "microsoft yahei"; font-size: 16px;">　　如果電位將曲線的平坦點(diǎn)難以確定，則可能是受被試接地裝置或電流極C的影響，考慮延長電流回路;或者是地下情況復(fù)雜，考慮以其他方法來測試和校驗(yàn)。</span></p><p style="margin: 0px; padding: 0px; font-family: 宋體, Tahoma, Arial; font-size: 14px; text-align: justify;"><span style="font-family: 微軟雅黑, "microsoft yahei"; font-size: 16px;">　　2、電流—電壓表三極法</span></p><p style="margin: 0px; padding: 0px; font-family: 宋體, Tahoma, Arial; font-size: 14px; text-align: justify;"><span style="font-family: 微軟雅黑, "microsoft yahei"; font-size: 16px;">　　a)直線法</span></p><p style="margin: 0px; padding: 0px; font-family: 宋體, Tahoma, Arial; font-size: 14px; text-align: justify;"><span style="font-family: 微軟雅黑, "microsoft yahei"; font-size: 16px;">　　電流線和電位線同方向(同路徑)防設(shè)稱為三極法中的直線法，示意圖2;dcG符合測試回路的布置的要求, dPG通常為(0.5~0.6) dcG.電位極P應(yīng)在被測接地裝置G與電流極C連線方向移動三次，每次移動的距離為dcG的5%左右，當(dāng)三次測試的結(jié)果誤差在5%以內(nèi)即可。</span></p><p style="margin: 0px; padding: 0px; font-family: 宋體, Tahoma, Arial; font-size: 14px; text-align: justify;"><span style="font-family: 微軟雅黑, "microsoft yahei"; font-size: 16px;">　　<strong style="font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; line-height: 30px; font-family: 微軟雅黑;">大地網(wǎng)接地電阻測試儀</strong>一般不宜采用直線法測試。如果條件所限而必須采用時(shí)，應(yīng)注意使電流線和電位線保持盡量遠(yuǎn)的距離，以減小互感耦合對測試結(jié)果的影響。</span><span style="font-family: 微軟雅黑, "microsoft yahei"; font-size: inherit;">　　</span></p><p style="margin: 0px; padding: 0px; font-family: 宋體, Tahoma, Arial; font-size: 14px; text-align: center;"><img alt="大地網(wǎng)接地電阻測試儀在變電站測試中的使用圖解" src="https://www.wh-huayi.com/ueditor/php/upload/image/20200827/1598517644651999.jpg" style="margin: 0px; padding: 0px; border: 0px; max-width: 100%;" /></p><p style="margin: 0px; padding: 0px; font-family: 宋體, Tahoma, Arial; font-size: 14px; text-align: justify;"> </p><p style="margin: 0px; padding: 0px; font-family: 宋體, Tahoma, Arial; font-size: 14px; text-align: justify;"><span style="font-family: 微軟雅黑, "microsoft yahei"; font-size: 16px;">　　G—被試接地裝置;C—電流極;P—電位極;D—被試接地裝置大對角線長度;dCG—電流極與被試接地裝置邊緣的距離;dPG—電位極與被試接地裝置邊緣的距離;</span></p><p style="margin: 0px; padding: 0px; font-family: 宋體, Tahoma, Arial; font-size: 14px; text-align: justify;"><span style="font-family: 微軟雅黑, "microsoft yahei"; font-size: 16px;">　　圖2 電流—電壓表三極法接線示意圖</span></p><p style="margin: 0px; padding: 0px; font-family: 宋體, Tahoma, Arial; font-size: 14px; text-align: justify;"><span style="font-family: 微軟雅黑, "microsoft yahei"; font-size: 16px;">　　b)夾角法</span></p><p style="margin: 0px; padding: 0px; font-family: 宋體, Tahoma, Arial; font-size: 14px; text-align: justify;"><span style="font-family: 微軟雅黑, "microsoft yahei"; font-size: 16px;">　　只要條件允許，大地網(wǎng)接地電阻測試儀接地阻抗的測試都采用電流——電位線夾角布置的方式。dcG符合測試回路的布置的要求,一般為4D~5D，對超大型接地裝置則盡量遠(yuǎn);dPG的長度與dcG相近。接地阻抗可用公式(2)修正(2)式中θ---電流線和電位線的夾角;Z'--- 接地阻抗的測試值。</span><span style="font-family: 微軟雅黑, "microsoft yahei"; font-size: inherit;">　　</span></p><p style="margin: 0px; padding: 0px; font-family: 宋體, Tahoma, Arial; font-size: 14px; text-align: center;"><img alt="大地網(wǎng)接地電阻測試儀在變電站測試中的使用圖解" src="https://www.wh-huayi.com/ueditor/php/upload/image/20200827/1598517644153119.jpg" style="margin: 0px; padding: 0px; border: 0px; max-width: 100%;" /></p><p style="margin: 0px; padding: 0px; font-family: 宋體, Tahoma, Arial; font-size: 14px; text-align: justify;"> </p><p style="margin: 0px; padding: 0px; font-family: 宋體, Tahoma, Arial; font-size: 14px; text-align: justify;"><span style="font-family: 微軟雅黑, "microsoft yahei"; font-size: 16px;">　　如果土壤電阻率均勻，可采用 dcG和 dpG相等的等腰三角形布線，此時(shí)使θ 約為30°，dcG=dpG=2D接地修正公式2。</span></p><p style="margin: 0px; padding: 0px; font-family: 宋體, Tahoma, Arial; font-size: 14px; text-align: justify;"><span style="font-family: 微軟雅黑, "microsoft yahei"; font-size: 16px;">　　3、接地電阻測試儀法。</span></p><p style="margin: 0px; padding: 0px; font-family: 宋體, Tahoma, Arial; font-size: 14px; text-align: justify;"><span style="font-family: 微軟雅黑, "microsoft yahei"; font-size: 16px;">　　圖3是接地電阻測試儀測試接地網(wǎng)接地電阻的接線方法;測試原理、布線、要求與三極法類似。</span></p><p style="margin: 0px; padding: 0px; font-family: 宋體, Tahoma, Arial; font-size: 14px; text-align: justify;"><span style="font-family: 微軟雅黑, "microsoft yahei"; font-size: 16px;">　　E極在使用三極法測量時(shí)須與P1短接起來，但當(dāng)?shù)鼐W(wǎng)接地電阻很小，當(dāng)?shù)鼐W(wǎng)接地電阻較小時(shí)(≤0.5Ω),為了提高測量精度,減小儀器與地網(wǎng)測量引線電阻及接觸電阻對測量結(jié)果的影響,可將E.P短路片解開;減小接觸電阻引起的誤差，需單獨(dú)引線與地網(wǎng)測試點(diǎn)相連。</span><span style="font-family: 微軟雅黑, "microsoft yahei"; font-size: inherit;">　　</span></p><p style="margin: 0px; padding: 0px; font-family: 宋體, Tahoma, Arial; font-size: 14px; text-align: center;"><img alt="大地網(wǎng)接地電阻測試儀在變電站測試中的使用圖解" src="https://www.wh-huayi.com/ueditor/php/upload/image/20200827/1598517645795892.jpg" style="margin: 0px; padding: 0px; border: 0px; max-width: 100%;" /></p><p style="margin: 0px; padding: 0px; font-family: 宋體, Tahoma, Arial; font-size: 14px; text-align: justify;"> </p><p style="margin: 0px; padding: 0px; font-family: 宋體, Tahoma, Arial; font-size: 14px; text-align: justify;"><span style="font-family: 微軟雅黑, "microsoft yahei"; font-size: 16px;">　　注：1、E――接被測量地網(wǎng);2、P1――接被測量地網(wǎng);3、P2――接測量電壓線(其長度取電流線長度的0.618倍);</span></p><p style="margin: 0px; padding: 0px; font-family: 宋體, Tahoma, Arial; font-size: 14px; text-align: justify;"><span style="font-family: 微軟雅黑, "microsoft yahei"; font-size: 16px;">　　4、C――接測量電流線(其長度取地網(wǎng)對角線長度的4～5倍);</span></p><p style="margin: 0px; padding: 0px; font-family: 宋體, Tahoma, Arial; font-size: 14px; text-align: justify;"> </p> <div id="f55nvtnxj1n" class="clear"></div> </div> <div id="f55nvtnxj1n" class="article"> <p>上一篇：<a href="/Article-2690703.html">分流器與電流表連接方式</a></p> <p>下一篇：<a href="/Article-2690700.html">大地網(wǎng)接地電阻測試儀在變電站測試中的使用</a></p> </div> <div id="f55nvtnxj1n" class="clear"></div> </div> </div> <div id="f55nvtnxj1n" class="n-9"> <div id="f55nvtnxj1n" class="c-right"> <div id="f55nvtnxj1n" class="c-1 r-pro"> <div id="f55nvtnxj1n" class="c-left"> <div 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