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id="ihno5c4uhq" class="inside_rnewtime">點擊次數(shù)：1264 更新時間：2022-06-14</div> <div id="ihno5c4uhq" class="inside_rnewcon"><p><span style="font-size: 16px;"><strong>絕緣電阻測試儀常見問題</strong></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); text-indent: 2em;">絕緣電阻測試儀適用于各種電氣設(shè)備的維護、維修、測試和檢定中的絕緣測試。</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;">Q1：測量容性負載電阻時，絕緣電阻測試儀的輸出短路電流與實測數(shù)據(jù)有什么關(guān)系，為什么？</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;">A1：絕緣電阻測試儀的輸出短路電流可以反映高壓電源的內(nèi)阻。測試過程開始時，絕緣電阻測試儀中的高壓源應(yīng)通過其內(nèi)阻對電容器充電，逐漸充電至絕緣電阻測試儀輸出的額定高壓值。顯然，如果測試對象的電容值較大或高壓電源內(nèi)阻較大，則充電過程將需要更長的時間。它的長度可以由 R 和 C 負載（以秒為單位）的乘積確定。請注意，在測試過程中，對電容器充電的電流和流經(jīng)被測物絕緣電阻的電流一起流入絕緣電阻測試儀。絕緣電阻測試儀測得的電流不僅包括絕緣電阻上的分量，還包括電容器充電電流的分量。這時，被測電阻會變小。</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;">Q2：測試絕緣時，不僅要測量純電阻，還要測量吸收比和極化指數(shù)。是什么原因？</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;">A2：在絕緣測試中，某一時刻的絕緣電阻值不能*反映測試對象的絕緣性能。這是由于以下兩個原因：一方面，相同性能的絕緣材料的絕緣電阻大時絕緣電阻小，但體積小時絕緣電阻大。</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，在施加高電壓后，絕緣材料中存在電荷吸收率和極化過程。因此，電力系統(tǒng)要求在主變壓器、電纜和電動機的絕緣試驗中，吸收比，即R60s與R15s之比，以及極化指數(shù)，即R10min與R1min之比，應(yīng)為在主變壓器、電纜、電機等絕緣試驗中測量。</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;">Q3：在高電壓、高電阻的測試環(huán)境下，需要用“G"端子連接儀器。為什么？</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;">A3：被測物兩端施加較高額定電壓且絕緣電阻高時，被測物表面潮濕，污染引起的漏電大，示值誤差大。儀器的“G"端為被測物漏面的電流旁路，使漏電流不通過儀器的測試電路，消除漏電流引起的誤差。</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;">Q4：在測量某些類型絕緣儀表“L"和“E"兩端的額定輸出直流高壓時，用指針式萬用表DCV測量L和E處的電壓，為什么電壓下降很多，但數(shù)字萬用表沒有？</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;">A4：用普通指針式萬用表直接測量絕緣電阻測試儀“L"和“E"的額定直流電壓。測量結(jié)果遠小于標稱額定電壓值（超出誤差范圍），而數(shù)字萬用表則不會。這是因為指針萬用表的內(nèi)阻比數(shù)字萬用表小。指針萬用表內(nèi)阻小，絕緣電阻測試儀LE端的輸出電壓下降很多，不是正常工作時的輸出電壓。但是，直接用萬用表測量絕緣電阻測試儀的輸出電壓是錯誤的。 </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;">Q5：可以用兆歐表直接測量被測帶電物體嗎？結(jié)果的影響是什么？為什么？</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;">A5：為了人身安全和正常測試，原則上不允許測量帶電測試對象。如果要測量帶電物體，儀器不會損壞（短時間內(nèi)），但測試結(jié)果不準確。被測物在充電后會與其他被測物相連，因此得到的結(jié)果并不能真實反映實際數(shù)據(jù)，而是與其他被測物并聯(lián)或串聯(lián)的電阻值。</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;">Q6：為什么電子絕緣電阻測試儀的幾節(jié)電池會產(chǎn)生很高的直流電壓？</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;">A6：根據(jù)直流變換的原理，較低的電源電壓經(jīng)過升壓電路處理后升至較高的輸出直流電壓。產(chǎn)生的高壓雖然高，但輸出功率小。（比如幾節(jié)電*可以產(chǎn)生幾萬伏的高壓）</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;">Q7：使用絕緣電阻測試儀測量絕緣電阻時，哪些因素會導(dǎo)致測量數(shù)據(jù)不準確？為什么？</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;">A7：</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 電池電壓不足。電池欠壓電壓過低，導(dǎo)致電路不能正常工作，因此測得的讀數(shù)不準確。</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;">② 測試接線不正確?！癓"、“G"、“E"三個端子接錯，或?qū)ⅰ癎"、“L"接在被測物兩端。</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;">③“G"端子未連接。由于被測物因污染、潮濕等因素漏電流引起的誤差，需要連接“G"端子線，以防止漏電流引起的誤差。</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;">④ 干擾過多。如果被測物受到環(huán)境電磁干擾過大，儀表讀數(shù)會跳動。或者指針抖動。結(jié)果是讀數(shù)不準確。</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;">⑤人為讀數(shù)錯誤。用指針式絕緣電阻測試儀測量時，由于人為角度誤差或刻度誤差，示值不準確。</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;">⑥ 儀器錯誤。儀器本身誤差過大，需要重新校正。</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;">Q8：測量容性負載（如主變壓器）時，指針顯示電阻值在某一段突然下降（不是正常測試區(qū)間的緩慢小擺動），來回擺動很快。為什么？</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;">A8：這種現(xiàn)象主要是由于測試系統(tǒng)的某些部分放電和點火引起的。當(dāng)容性測試物被充電到一定電壓時，如果儀器內(nèi)部測試線或被測物的任何部分有擊穿放電和點火，就會出現(xiàn)上述現(xiàn)象。判別方法如下：</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如果儀器測試臺沒有接測試線，打開電源和高壓，看儀器內(nèi)是否有點火（如果有火花，可以聽到放電點火的聲音）。</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;">②連接L、G、E測試線，不要連接被測物。將L測試線端夾懸空，接通高壓，查看測試線上是否有打火現(xiàn)象。點火時，檢查： a) L、G 測試線的芯線（L 端）是否與外露的線（g 端）靠得太近而產(chǎn)生引弧。b) L 端芯線插頭與測試臺或測試夾的屏蔽環(huán)與被測物接觸不良，導(dǎo)致著火。c) 測試線、插頭和夾子之間的假焊開路導(dǎo)致間隙放電。</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;">③連接被測物，檢查端子夾與被測物接觸點附近是否有放電、點火現(xiàn)象。</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;">④排除以上原因，連接被測物，接通高壓。如果儀器仍存在上述現(xiàn)象，則說明被測物絕緣擊穿引起局部放電或飛弧。</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;">Q9：為什么不同的絕緣電阻測試儀測得的值不同？</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;">A9：由于高壓絕緣電阻測試儀的測試電源電壓源不理想，內(nèi)阻RI不同，測量電路的串聯(lián)電阻rm不同，動態(tài)測量精度不同，現(xiàn)場測量操作不合理或錯誤，不同型號的絕緣電阻測試儀對同一被測物的測量結(jié)果會有所不同。在實際測量中，應(yīng)考慮絕緣電阻測試儀絕緣測試條件的特殊性，盡可能減少可能出現(xiàn)的測量誤差：</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 用不同型號的絕緣表測量同一樣品時，應(yīng)采用相同的電壓等級和接線方法。例如，在測量電力變壓器高壓繞組的絕緣時，當(dāng)絕緣電阻測試儀的L端按鈕總是接在繞組的出線端時，有一種直接的方法是將E端按鈕與低電壓連接。電壓繞組和外殼，G端按鈕懸空；E端接低壓繞組，G端接外殼（低電位屏蔽）；G端鈕接高壓繞組套管表面，E端鈕先接低壓繞組，再接或不接外殼（高電位屏蔽））。E端接外殼，G端接低壓繞組。對于不同結(jié)構(gòu)和系統(tǒng)的絕緣電阻測試儀，G端子按鈕的電位不同，因此應(yīng)相應(yīng)改變G端子按鈕在套管表面的放置位置。</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;">② 不同型號的絕緣電阻測試儀量程和示值校準方法不同，校準分辨率不同，測量精度等級不同，會導(dǎo)致示值之間存在差異。為了保證電力設(shè)備的準確測量，必須避免使用精度低、不方便的兆歐表。</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;">③ 大部分樣品含有電容成分，有介電極化現(xiàn)象。即使測試條件相同，也很難獲得理想的數(shù)據(jù)重復(fù)性。</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;">④ 測量時，絕緣介質(zhì)溫度和油溫應(yīng)與環(huán)境溫度保持一致，差異一般為±5%。</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;">⑤ 應(yīng)在特定時間段允許的時間差內(nèi)盡快讀取測量值。為使測量誤差不大于±5%，讀數(shù)R60s時間允許誤差為±3S，而r15s讀數(shù)時間不應(yīng)相差±1s。</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;">⑥ 高壓測試電源不是理想的電壓源，重載時輸出電壓低于其額定值（被測物絕緣電阻值?。瑫?dǎo)致絕緣電阻測量精度下降由于換算系數(shù)的變化，測試儀采用單支直讀法。這種變化隨絕緣電阻測試儀測試的電源負載特性而變化。</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;">⑦ 對于不同動態(tài)測試容量指標的絕緣電阻測試儀，測試對象（和采樣電阻）上的測試電壓的建立過程和測試對象的充電容量不同，測量結(jié)果也會不同。網(wǎng)絡(luò)（包括指針式儀表的機械慣性），示值響應(yīng)速度慢，要正確反映被測物真實絕緣電阻值隨時間的變化規(guī)律為時已晚。特別是在測試初期，電容器的充電電流沒有*衰減到零，會使r15s和吸收比讀數(shù)值有較大的誤差（較?。?。</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;">⑧ 電介質(zhì)的極化與外加電壓有關(guān)。由于測試電壓不能很快達到額定值，或者由于絕緣電阻測試儀測試電源的負載特性不同，施加在被測物上的測試電壓不同，被測物的初始極化狀態(tài)不同，導(dǎo)致不同的吸收電流和不同的邊緣電阻測量指示值。</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;">⑨ 國外一些絕緣電阻測試儀的測試高壓是連續(xù)可調(diào)的，開機后從零調(diào)到額定值。絕緣電阻測試儀讀數(shù)開始時間的不確定性和高壓達到額定值時間的不確定性，使被測物的初始極化不同，也會造成示值之間的差異。</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;">⑩ 不同的絕緣電阻測試儀具有不同的靈敏度和抗場干擾能力，同一樣品的讀數(shù)值會有所不同。</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;">? 示值差異是由于數(shù)據(jù)隨機波動的常規(guī)測量誤差與絕緣電阻測試儀的方法誤差不同造成的。</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;">? 介質(zhì)放電不充分是造成重復(fù)測量結(jié)果差異的重要原因之一。根據(jù)充電吸收電流與其反向放電電流的對應(yīng)可逆特性，如果需要對同一個樣品進行第二次測量，第一次測量后樣品的短路放電間隔時間應(yīng)大于測量的目的為了充分釋放積累的吸收電荷，樣品的絕緣介質(zhì)可以*恢復(fù)到原來的非極化狀態(tài)，否則會影響二次測量數(shù)據(jù)的準確性。為使被測物無殘留電荷，每次測試前也應(yīng)將測量端對地短接，有時甚至接近1小時，與無關(guān)設(shè)備連接的電線應(yīng)拆除?？傊?，同一樣品不同時期的絕緣測量應(yīng)采用相同的試驗電壓等級和接線方式，并盡量使用同型號或相近性能的絕緣電阻計，以保證測量數(shù)據(jù)的可比性。 .</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;">? 特別強調(diào)選擇動態(tài)測量精度低、高壓測試電源容量小的儀器。由于電容器充電電流還沒有*衰減到零，儀器的示值不能準確實時跟蹤被測物表觀絕緣電阻值的變化，R15s的電阻值偏低，有是一個很大的錯誤測試人員應(yīng)該特別注意。這也可能是不同型號的高壓絕緣電阻測試儀測量同一樣品時吸收比不同的主要原因。也說明吸收率指標不如極化指標科學(xué)性和客觀性。</p></div> <div id="ihno5c4uhq" class="inside_newsthree"> <p id="newsprev">上一篇：<b class="newsprev"><a href="/Article-3041007.html">絕緣電阻測試儀操作步驟及注意事項</a></b></p> <p id="newsnext">下一篇：<b class="newsnext"><a href="/Article-3041005.html">如何有效地選擇大電流發(fā)生器？</a></b></p> <span><a 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