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微軟雅黑;">大地網(wǎng)接地電阻測(cè)試儀在變電站測(cè)試中的使用圖解</strong></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-family: 宋體, Tahoma, Arial; text-align: justify;"><span microsoft="" font-size:=""> 測(cè)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(duì)角線長(zhǎng)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(zhǎng)度為電流引線長(zhǎng)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-top: 0px; margin-bottom: 0px; padding: 0px; font-family: 宋體, Tahoma, Arial; text-align: justify;"><span microsoft="" font-size:="">　　1、電位降法</span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-family: 宋體, Tahoma, Arial; text-align: justify;"><span microsoft="" font-size:="">　　電位降法測(cè)試接地裝置的接地阻抗是按圖1布置測(cè)試回路，且符合測(cè)試回路的布置的要求。</span><span microsoft="" font-size:="">　　</span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-family: 宋體, Tahoma, Arial; text-align: center;"><img alt="大地網(wǎng)接地電阻測(cè)試儀在變電站測(cè)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%; max-height: 100%;"/></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-family: 宋體, Tahoma, Arial; text-align: justify;"> </p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-family: 宋體, Tahoma, Arial; text-align: justify;"><span microsoft="" font-size:="">　　G—被試接地裝置;C—電流極;P—電位極;D—被試接地裝置大對(duì)角線長(zhǎng)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(cè)試距離間隔;</span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-family: 宋體, Tahoma, Arial; text-align: justify;"><span microsoft="" font-size:="">　　圖1電位降法測(cè)試接地裝置的接地阻抗</span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-family: 宋體, Tahoma, Arial; text-align: justify;"><span microsoft="" font-size:="">　　流過(guò)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(kāi)始沿與電流回路呈30°~45°的方向向外移動(dòng)，每間隔d(50m或100m或200m)測(cè)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-top: 0px; margin-bottom: 0px; padding: 0px; font-family: 宋體, Tahoma, Arial; text-align: justify;"><span microsoft="" font-size:="">　　如果電位測(cè)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-top: 0px; margin-bottom: 0px; padding: 0px; font-family: 宋體, Tahoma, Arial; text-align: justify;"><span microsoft="" font-size:="">　　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(zhǎng)電流回路;或者是地下情況復(fù)雜，考慮以其他方法來(lái)測(cè)試和校驗(yàn)。</span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-family: 宋體, Tahoma, Arial; text-align: justify;"><span microsoft="" font-size:="">　　2、電流—電壓表三極法</span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-family: 宋體, Tahoma, Arial; text-align: justify;"><span microsoft="" font-size:="">　　a)直線法</span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-family: 宋體, Tahoma, Arial; text-align: justify;"><span microsoft="" font-size:="">　　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(cè)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(cè)接地裝置G與電流極C連線方向移動(dòng)三次，每次移動(dòng)的距離為dcG的5%左右，當(dāng)三次測(cè)試的結(jié)果誤差在5%以內(nèi)即可。</span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-family: 宋體, Tahoma, Arial; text-align: justify;"><span microsoft="" font-size:="">　　<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(cè)試儀</strong>一般不宜采用直線法測(cè)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(duì)測(cè)試結(jié)果的影響。</span><span microsoft="" font-size:="">　　</span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-family: 宋體, Tahoma, Arial; text-align: center;"><img alt="大地網(wǎng)接地電阻測(cè)試儀在變電站測(cè)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%; max-height: 100%;"/></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-family: 宋體, Tahoma, Arial; text-align: justify;"> </p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-family: 宋體, Tahoma, Arial; text-align: justify;"><span microsoft="" font-size:="">　　G—被試接地裝置;C—電流極;P—電位極;D—被試接地裝置大對(duì)角線長(zhǎng)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-top: 0px; margin-bottom: 0px; padding: 0px; font-family: 宋體, Tahoma, Arial; text-align: justify;"><span microsoft="" font-size:="">　　圖2 電流—電壓表三極法接線示意圖</span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-family: 宋體, Tahoma, Arial; text-align: justify;"><span microsoft="" font-size:="">　　b)夾角法</span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-family: 宋體, Tahoma, Arial; text-align: justify;"><span microsoft="" font-size:="">　　只要條件允許，大地網(wǎng)接地電阻測(cè)試儀接地阻抗的測(cè)試都采用電流——電位線夾角布置的方式。dcG符合測(cè)試回路的布置的要求,一般為4D~5D，對(duì)超大型接地裝置則盡量遠(yuǎn);dPG的長(zhǎng)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(cè)試值。</span><span microsoft="" font-size:="">　　</span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-family: 宋體, Tahoma, Arial; text-align: center;"><img alt="大地網(wǎng)接地電阻測(cè)試儀在變電站測(cè)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%; max-height: 100%;"/></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-family: 宋體, Tahoma, Arial; text-align: justify;"> </p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-family: 宋體, Tahoma, Arial; text-align: justify;"><span microsoft="" font-size:="">　　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-top: 0px; margin-bottom: 0px; padding: 0px; font-family: 宋體, Tahoma, Arial; text-align: justify;"><span microsoft="" font-size:="">　　3、接地電阻測(cè)試儀法。</span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-family: 宋體, Tahoma, Arial; text-align: justify;"><span microsoft="" font-size:="">　　圖3是接地電阻測(cè)試儀測(cè)試接地網(wǎng)接地電阻的接線方法;測(cè)試原理、布線、要求與三極法類似。</span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-family: 宋體, Tahoma, Arial; text-align: justify;"><span microsoft="" font-size:="">　　E極在使用三極法測(cè)量時(shí)須與P1短接起來(lái)，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(cè)量精度,減小儀器與地網(wǎng)測(cè)量引線電阻及接觸電阻對(duì)測(cè)量結(jié)果的影響,可將E.P短路片解開(kāi);減小接觸電阻引起的誤差，需單獨(dú)引線與地網(wǎng)測(cè)試點(diǎn)相連。</span><span microsoft="" font-size:="">　　</span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-family: 宋體, Tahoma, Arial; text-align: center;"><img alt="大地網(wǎng)接地電阻測(cè)試儀在變電站測(cè)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%; max-height: 100%;"/></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-family: 宋體, Tahoma, Arial; text-align: justify;"> </p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-family: 宋體, Tahoma, Arial; text-align: justify;"><span microsoft="" font-size:="">　　注：1、E――接被測(cè)量地網(wǎng);2、P1――接被測(cè)量地網(wǎng);3、P2――接測(cè)量電壓線(其長(zhǎng)度取電流線長(zhǎng)度的0.618倍);</span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-family: 宋體, Tahoma, Arial; text-align: justify;"><span microsoft="" font-size:="">　　4、C――接測(cè)量電流線(其長(zhǎng)度取地網(wǎng)對(duì)角線長(zhǎng)度的4～5倍);</span></p> <div id="ag0icou4w4" class="pagetb"> <p> 上一條：<a href="/Products-24908093.html">KD2571C1、CN大型地網(wǎng)接地電阻儀</a></p> <p> 下一條：<a href="/Products-24908150.html">KD2531T等電位 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