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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> > 接觸電阻測試的目</div> <div id="5hlvxzllpl3" class="page-news"> <div id="5hlvxzllpl3" class="newshowheader"> <h1 class="nd_title">接觸電阻測試的目</h1> <div id="5hlvxzllpl3" class="article-info"> <span> 瀏覽：</span> 855<span id="5hlvxzllpl3" class="split">|</span> <span id="publishtime">更新時間：2021-12-09</span> <span id="5hlvxzllpl3" class="split">|</span> </div> </div> <div id="5hlvxzllpl3" class="page-newshow"> <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;">斷路器在運(yùn)行過程中，不僅要受到機(jī)械力、電、熱等的作用，還要受到自然環(huán)境的影響。要求能長期穩(wěn)定工作，并有足夠的電氣和機(jī)械壽命。在一定條件下，要求斷路器各部分的溫升不超過損害電氣性能的允許溫度值，以保證電氣絕緣不被破壞，并能承受系統(tǒng)的最大工作電壓，內(nèi)部過電壓和外部雷擊過電壓。足夠的短路故障合閘能力，能可靠分?jǐn)囝~定電流和各種故障電流。簡而言之。斷路器在電網(wǎng)中主要起兩個作用：</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);"> </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;">控制功能：根據(jù)電網(wǎng)運(yùn)行需要，利用斷路器使部分電力設(shè)備或線路投入或停止運(yùn)行。</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);"> </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;">保護(hù)功能：當(dāng)電力線路或用電設(shè)備出現(xiàn)故障時，斷路器能迅速切斷故障部分與電網(wǎng)的連接，保證電網(wǎng)*部分的正常運(yùn)行。</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);"> </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;">總之，斷路器可以在正常工作條件下實(shí)現(xiàn)各種負(fù)載電路（包括變壓器、輸電線路等）的合閘和分?jǐn)?，也可以在?guī)定的時間內(nèi)分?jǐn)嗑€路中的短路故障。 . 實(shí)現(xiàn)自動重合。</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);"> </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;">電氣產(chǎn)品的可靠性一直是工程質(zhì)量的重要指標(biāo)之一。電網(wǎng)的可靠性很大程度上取決于電網(wǎng)中各種開關(guān)設(shè)備的可靠性。一旦交換設(shè)備出現(xiàn)故障，整個系統(tǒng)將無法正常工作，甚至癱瘓，造成的經(jīng)濟(jì)損失往往遠(yuǎn)高于交換設(shè)備本身的價值。統(tǒng)計(jì)顯示，在供配電系統(tǒng)中，由斷路器引起的意外停電在時間和數(shù)量上最多?，F(xiàn)代電網(wǎng)事故造成的經(jīng)濟(jì)損失不再單純以對系統(tǒng)的危害為依據(jù)。開關(guān)柜，特別是斷路器，是電網(wǎng)的核心部件之一，</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);"> </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;">一方面，回路電阻作為開關(guān)柜電氣參數(shù)中最重要的特性指標(biāo)之一，是早期發(fā)現(xiàn)供電異常的關(guān)鍵信息，也是電力系統(tǒng)性能和衰減可靠的指標(biāo)。在評估大多數(shù)類型電源連接的可靠性和預(yù)測故障時，包括斷路器、隔離開關(guān)、負(fù)載開關(guān)等，回路電阻穩(wěn)定性測試是很有效的，回路電阻的大小直接影響負(fù)載斷路器額定值短路條件下工作電流的溫升和動熱穩(wěn)定性。接觸電阻值的變化也會直接影響斷路器的可靠性 s 分合閘和斷路器操作的安全。具體來說，如果斷路器的回路電阻因某種原因增加，就會破壞原有的熱平衡，接觸部分的溫升增加，從而使導(dǎo)體的電阻率增加，進(jìn)一步增加發(fā)熱。在大電流情況下，會引起接觸面氧化和支撐絕緣子軟化或老化，從而引起斷路器失靈，使其在短路狀態(tài)下無法正常工作。并且接觸部分的溫升會增加，這會增加導(dǎo)體的電阻率并進(jìn)一步增加熱量的產(chǎn)生。在大電流情況下，會引起接觸面氧化和支撐絕緣子軟化或老化，從而引起斷路器失靈，使其在短路狀態(tài)下無法正常工作。并且接觸部分的溫升會增加，這會增加導(dǎo)體的電阻率并進(jìn)一步增加熱量的產(chǎn)生。在大電流情況下，會引起接觸面氧化和支撐絕緣子軟化或老化，從而引起斷路器失靈，使其在短路狀態(tài)下無法正常工作。</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);"> </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，雖然開關(guān)柜的回路電阻比較小，但從表中可以看出，在正常大電流運(yùn)行的情況下，接觸電阻異常（一般是電阻值增大）也會帶來大量的能量損失。此外，電路電阻試驗(yàn)也是斷路器出廠試驗(yàn)、型式試驗(yàn)、交接試驗(yàn)、預(yù)防性試驗(yàn)中的強(qiáng)制性項(xiàng)目。同時，斷路器導(dǎo)電回路的電阻值是斷路器安裝、維修和質(zhì)量驗(yàn)收的重要組成部分。</p> </div> <div id="5hlvxzllpl3" class="pagetb"> <p> 上一條：<a href="/Article-2872030.html">C31直流微安表講解</a></p> <p> 下一條：<a href="/Article-2867480.html">直流電阻測試儀常見故障及解決方法？</a></p> </div> </div> </div> </div> <div id="5hlvxzllpl3" class="footer"> <div id="5hlvxzllpl3" class="foot"> <p>Copyright © 2024 上?？档请姎饪萍加邢薰?版權(quán)所有 <a target="_blank" rel="nofollow">備案號：滬ICP備16026206號-4</a> 傳真：86-021-51714615<br /> 技術(shù)支持：<a target="_blank" rel="nofollow">化工儀器網(wǎng)</a> <a href="/sitemap.xml" target="_blank" >sitemap.xml</a> <a target="_blank" rel="nofollow">管理登陸</a> 總流量：370674<br /> 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