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href="/article.html">技術(shù)文章</a> > 回路電阻測試儀的原理是什么？有什么作用？</div> <div id="1571n5fppxr7" class="inpage_content"> <div id="1571n5fppxr7" class="nr_main_box"> <h1 class="inside_rnewtil">回路電阻測試儀的原理是什么？有什么作用？</h1> <div id="1571n5fppxr7" class="inside_rnewtime">點(diǎn)擊次數(shù)：566 更新時間：2023-01-14</div> <div id="1571n5fppxr7" class="inside_rnewcon"><p>回路電阻測試儀的原理是什么？有什么作用？</p><p><span style="color: rgb(24, 24, 24); font-family: 微軟雅黑, Arial, 宋體; font-size: 15px; text-indent: 2em;"> 回路電阻測試儀的詳細(xì)介紹按新《電力設(shè)備交接和預(yù)防性試驗(yàn)規(guī)程》要求，各種開關(guān)設(shè)備導(dǎo)電回路電阻的測量，其測試電流不得小于100A。</span><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);"><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;">高壓斷路器導(dǎo)電回路的電阻主要取決于斷路器的動、靜觸頭間的接觸電阻，接觸電阻的存在，增加了導(dǎo)體在通電時的損耗，使接觸處的溫度升高，其值的大小直接影響正常工作時的載流能力，在一定程度上影響短路電流的切斷能力，因此，斷路器每相導(dǎo)電回路電阻測試儀值是斷路器安裝、檢修、質(zhì)量驗(yàn)收的一項(xiàng)重要數(shù)據(jù)。</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;">回路電阻測試儀用途及適用范圍：接地電阻適用直接測量各種接地裝置的接地電阻值。亦可供一般低電阻的測量，四端鈕（0～1～10～100Ω規(guī)格）還可以測量土壤電阻率。</p><div><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;">回路電阻測試儀工作原理：</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;">回路電阻測試儀運(yùn)用脈寬調(diào)制式高頻開關(guān)電源提供大于100A的測試電流。按下測量鍵時，高頻開關(guān)電源輸出大于100A以上的測試電流，與此同時采樣電路開始采樣，取得的信號經(jīng)放大器放大。由A/D轉(zhuǎn)換器將模擬信號轉(zhuǎn)換成數(shù)字信號后。再經(jīng)微處理器對數(shù)據(jù)進(jìn)行濾波、運(yùn)算、處理。最后送顯示器顯示出此次測量的電流和電阻值。顯示10秒鐘后，系統(tǒng)自動復(fù)位。當(dāng)被測的回路電阻值小于400μΩ時，測量的最小分辨率為0、1μΩ。當(dāng)被測的回路電阻值大于400μΩ時，測量的最小分辨率為1μΩ。</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;"><span style="margin: 0px; padding: 0px; border: 0px; font: inherit;"><span style="margin: 0px; padding: 0px; border: 0px; font: inherit;">開關(guān)回路電阻測試儀</span></span>測試原理：</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、工頻交流電源整流后轉(zhuǎn)變成15KHz高頻電源。再變壓整流成低壓直流電源，反饋信號取至于負(fù)載電阻上的壓降。經(jīng)處理后調(diào)整高頻電流的脈沖寬度。即采用脈沖調(diào)寬技術(shù)來達(dá)到自動恒流的效果。</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 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