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class="5hlvxzllpl3" id="submenu_同高電子" style="display:none"> <li id="5hlvxzllpl3" class="left_nav_xl"><a href="/SonList-1408386.html" title="壓敏電阻測試儀">壓敏電阻測試儀</a></li> </div> </ul> </ul> </div> <div id="5hlvxzllpl3" class="page-right"> <div id="5hlvxzllpl3" class="onurl"> <a href="/"><img src="/Skins/333987/images/home.png"></a><a href="/">網(wǎng)站首頁</a>><a href="/article.html">技術(shù)文章</a> > 接地電阻測試儀技術(shù)的基礎(chǔ)知識</div> <div id="5hlvxzllpl3" class="page-news"> <div id="5hlvxzllpl3" class="newshowheader"> <h1 class="nd_title">接地電阻測試儀技術(shù)的基礎(chǔ)知識</h1> <div id="5hlvxzllpl3" class="article-info"> <span> 瀏覽：</span> 999<span id="5hlvxzllpl3" class="split">|</span> <span id="publishtime">更新時(shí)間：2021-11-18</span> <span id="5hlvxzllpl3" class="split">|</span> </div> </div> <div id="5hlvxzllpl3" class="page-newshow"> <p><strong>接地電阻測試儀技術(shù)的基礎(chǔ)知識</strong><br/></p><p style="margin-top: 2px; margin-bottom: 2px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24); text-indent: 2em;">接地電阻測試也稱為接地電阻測試，其起源于 1930 年代初?？捎玫募夹g(shù)有限，因此將零平衡振鏡、十進(jìn)制電阻箱和直流電源結(jié)合起來，成為*接地測試儀之一。</p><p style="margin-top: 2px; margin-bottom: 2px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24);"><br/></p><p style="margin-top: 2px; margin-bottom: 2px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24); text-indent: 2em;">多年后，手搖技術(shù)首先使用發(fā)電機(jī)提供測試電壓。1950 年代和 60 年代的電子產(chǎn)品催生了帶有電子放大器的電子接地測試儀。最終，數(shù)字顯示器出現(xiàn)了，但由于客戶的熟悉和偏好，模擬儀表仍然存在。</p><p style="margin-top: 2px; margin-bottom: 2px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24); text-indent: 2em;"><br/></p><p style="margin-top: 2px; margin-bottom: 2px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24); text-indent: 2em;">術(shù)語“接地"定義為將電路或設(shè)備連接到大地的導(dǎo)電連接。該連接用于盡可能接近地建立和保持電路或與其連接的設(shè)備上的接地電位?！敖拥?由接地導(dǎo)體、連接器、接地電極以及與電極接觸的土壤組成。</p><p style="margin-top: 2px; margin-bottom: 2px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24);"><br/></p><p style="margin-top: 2px; margin-bottom: 2px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24); text-indent: 2em;">“地"有多種保護(hù)應(yīng)用。對于閃電等自然現(xiàn)象，接地用于在人員受傷或系統(tǒng)組件損壞之前釋放系統(tǒng)電流。對于由于具有接地回路的電力系統(tǒng)中的故障引起的外來電位，接地通過提供低電阻故障電流路徑來幫助確保保護(hù)繼電器的快速操作。這提供了盡可能快地去除外部電位。接地設(shè)計(jì)用于在人員受傷和電源或通信系統(tǒng)損壞之前排出外來電位。</p><p style="margin-top: 2px; margin-bottom: 2px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24);"><br/></p><p style="margin-top: 2px; margin-bottom: 2px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24); text-indent: 2em;">理想情況下，為了保持儀器安全的參考電位、防止靜電并將系統(tǒng)限制在框架電壓以保證操作員安全，接地電阻應(yīng)盡可能接近于零歐姆。</p><p style="margin-top: 2px; margin-bottom: 2px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24);"><br/></p><p style="margin-top: 2px; margin-bottom: 2px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24); text-indent: 2em;">典型接地電極系統(tǒng)的基本組件包括以下組件：</p><p style="margin-top: 2px; margin-bottom: 2px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24);"><br/></p><p style="margin-top: 2px; margin-bottom: 2px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24); text-indent: 2em;">1.金屬及其連接的電阻。</p><p style="margin-top: 2px; margin-bottom: 2px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24); text-indent: 2em;">2.周圍大地與電極的接觸電阻。</p><p style="margin-top: 2px; margin-bottom: 2px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24); text-indent: 2em;">3.周圍地球?qū)﹄娏鞯碾娮璺Q為土壤電阻率，這通常是最重要的因素。</p><p style="margin-top: 2px; margin-bottom: 2px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24);"><br/></p><p style="margin-top: 2px; margin-bottom: 2px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24); text-indent: 2em;">接地電極通常由非常導(dǎo)電的金屬（銅或銅包層）制成，具有足夠的橫截面，因此總電阻可以忽略不計(jì)。標(biāo)準(zhǔn)與技術(shù)研究院已經(jīng)證明，如果電極沒有油漆、油脂或其他涂層，并且地球緊緊地包裹在它周圍，則電極與周圍地球之間的電阻可以忽略不計(jì)。</p><p style="margin-top: 2px; margin-bottom: 2px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24);"><br/></p><p style="margin-top: 2px; margin-bottom: 2px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24); text-indent: 2em;">剩下的組成部分是周圍地球的電阻。</p><p style="margin-top: 2px; margin-bottom: 2px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24);"><br/></p><p style="margin-top: 2px; margin-bottom: 2px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24); text-indent: 2em;">可以認(rèn)為電極被地球或土壤的同心殼包圍，厚度相同。殼離電極越近，其表面越小；因此，它的阻力越大。殼離電極越遠(yuǎn)，殼的表面積越大；因此，電阻越低。最終，在距接地電極一定距離處添加外殼將不再顯著影響電極周圍的整體接地電阻。發(fā)生這種效應(yīng)的距離稱為有效電阻面積，直接取決于接地電極的深度。</p><p style="margin-top: 2px; margin-bottom: 2px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24);"><br/></p><p style="margin-top: 2px; margin-bottom: 2px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24); text-indent: 2em;">電位下降測試方法需要放置兩個(gè)輔助電極，一個(gè)國際上稱為 H 的注射器和一個(gè)稱為 S 的電位電極。</p><p style="margin-top: 2px; margin-bottom: 2px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24);"><br/></p><p style="margin-top: 2px; margin-bottom: 2px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24); text-indent: 2em;">精確測量對地電阻的目標(biāo)是將輔助電流注入電極 H 放置在距離被測接地電極足夠遠(yuǎn)的位置，我們將其標(biāo)記為 E，以便輔助電位電極 S 位于兩個(gè)接地電極的有效電阻區(qū)域之外。接地極和輔助電流極。確定輔助電位棒 S 是否在有效電阻區(qū)域之外的最佳方法是將其在 E 和 H 之間移動(dòng)并在每個(gè)位置讀取讀數(shù)。如果輔助電位棒 S 位于有效電阻區(qū)域（或如果它們重疊則在兩個(gè)區(qū)域內(nèi)），通過移動(dòng)它（見圖 A），讀取的讀數(shù)值會發(fā)生顯著變化，通常變化 5% 或更多。在這些條件下，無法確定接地電阻的確切值。</p><p style="margin-top: 2px; margin-bottom: 2px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24);"><br/></p><p style="margin-top: 2px; margin-bottom: 2px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24); text-indent: 2em;">另一方面，如果輔助電位棒 S 位于有效電阻區(qū)域之外（見圖 B），則當(dāng)它來回移動(dòng)時(shí)，讀數(shù)變化最小。讀取的讀數(shù)應(yīng)彼此相對接近，并且是系統(tǒng) E 對地電阻的最佳值。應(yīng)繪制讀數(shù)以確保它們位于圖 B 所示的“高原"區(qū)域。該區(qū)域通常被稱為“62% 區(qū)域"。通常每 10% 距離被測地面和注入器電極讀取一次讀數(shù)，總共進(jìn)行 9 次測量。沿測試路徑通常出現(xiàn)在 50% 和 70% 之間的三個(gè)接近讀數(shù)的平均值是被測系統(tǒng)的有效電阻。</p><p style="margin-top: 2px; margin-bottom: 2px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24);"><br/></p><p style="margin-top: 2px; margin-bottom: 2px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24); text-indent: 2em;">經(jīng)過多年對實(shí)際測試數(shù)據(jù)的分析，采用了簡化的測試方法，即62%方法。在這種情況下，僅在接地系統(tǒng)和注入器電極之間距離的 52%、62% 和 72% 處進(jìn)行三個(gè)測量，三個(gè)讀數(shù)的平均值用于確定被測系統(tǒng)的有效電阻，只要電極放置在彼此影響之外。</p> </div> <div id="5hlvxzllpl3" class="pagetb"> <p> 上一條：<a href="/Article-2844754.html">數(shù)字絕緣電阻表測量的注意事項(xiàng)</a></p> <p> 下一條：<a href="/Article-2839922.html">掌握TQSB高壓試驗(yàn)變壓器正確的操作步驟注意一些小事項(xiàng)</a></p> </div> </div> </div> </div> <div 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