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style="font-family:宋體">1．試驗(yàn)原理</span></span></strong><strong></strong></p><p style="text-indent:32px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:16px"> </span></p><p style="text-indent:32px;text-align:center;line-height:150%"><br/></p><p style="text-indent:32px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:16px"><span style="font-family:宋體">圖</span><span style="font-family:宋體">1所示為JS型動(dòng)作記數(shù)器的原理接線圖。圖1（a）為JS型動(dòng)作記數(shù)器的基本結(jié)構(gòu)，即所謂的雙閥片式結(jié)構(gòu)。當(dāng)避雷器動(dòng)作時(shí)，放電電流流過(guò)閥片R1，在R1上的壓降經(jīng)閥片R2給電容器C充電，然后C再對(duì)電磁式記數(shù)器的電感線圈L放電，使其轉(zhuǎn)動(dòng)1格，記1次數(shù)。改變R1及R2的阻值，可使記數(shù)器具有不同的靈敏度。一般最小動(dòng)作電流為100A（8／20μs）的沖擊電流。因R1上有一定的壓降，將使避雷器的殘壓有所增加，故它主要用于40</span></span><span style=";font-family:宋體;line-height:150%;font-size:16px"><span style="font-family:宋體">kV</span></span><span style=";font-family:宋體;line-height:150%;font-size:16px"><span style="font-family:宋體">以上的高壓避雷器。圖</span><span style="font-family:宋體">1（b）表示JS－8型動(dòng)作記數(shù)器的結(jié)構(gòu)，系整流式結(jié)構(gòu)。避雷器動(dòng)作時(shí)，高溫閥片R1上的壓降經(jīng)全波整流給電容器C充電，然后C再對(duì)電磁式記數(shù)器的L放電，使其記數(shù)。該記數(shù)器的閥片R1的阻值較?。ㄔ?0kA時(shí)的壓降為1.1</span></span><span style=";font-family:宋體;line-height:150%;font-size:16px"><span style="font-family:宋體">kV</span></span><span style=";font-family:宋體;line-height:150%;font-size:16px"><span style="font-family:宋體">），通流容量較大（</span><span style="font-family:宋體">1200A方波），最小動(dòng)作電流也為100A（8／20μs）的沖擊電流。JS－8型記數(shù)器可用于6.0～330</span></span><span style=";font-family:宋體;line-height:150%;font-size:16px"><span style="font-family:宋體">kV</span></span><span style=";font-family:宋體;line-height:150%;font-size:16px"><span style="font-family:宋體">系統(tǒng)的避雷器，</span><span style="font-family:宋體">JS－8A型記數(shù)器可用于500</span></span><span style=";font-family:宋體;line-height:150%;font-size:16px"><span style="font-family:宋體">kV</span></span><span style=";font-family:宋體;line-height:150%;font-size:16px"><span style="font-family:宋體">系統(tǒng)的避雷器。</span></span></p><p style="text-indent:32px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:16px"> </span></p><p style="text-align: center"><img style="max-width:800px;max-height:300%;" src="https://img48.chem17.com/9/20231010/638325193362781078503.png" title="0C3G_@S8R@Z1GTD$P2MM_)S.png" alt="0C3G_@S8R@Z1GTD$P2MM_)S.png"/></p><p style="text-indent:32px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:16px"></span><br/></p><p style="line-height:150%"><strong><span style=";font-family:宋體;line-height:150%;font-size:16px"><span style="font-family:宋體">2．動(dòng)作的檢查方法及計(jì)數(shù)器檢測(cè)儀原理</span></span></strong><strong></strong></p><p style="line-height:150%"><strong><span style=";font-family:宋體;line-height:150%;font-size:16px"> </span></strong></p><p style="text-indent:32px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:16px"><span style="font-family:宋體">由于密封不良，動(dòng)作記數(shù)器在運(yùn)行中可能進(jìn)入潮氣或水分，使內(nèi)部元件銹蝕，導(dǎo)致記數(shù)器不能正常動(dòng)作，所以《規(guī)程》規(guī)定，每年應(yīng)檢查</span><span style="font-family:宋體">1次?，F(xiàn)場(chǎng)檢查記數(shù)器動(dòng)作的方法有電容器放電流支、交流法和標(biāo)準(zhǔn)沖擊電流法。研究表明，以標(biāo)準(zhǔn)沖擊電流法最為可靠，其原理接線如圖2所示。</span></span></p><p style="text-indent:32px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:16px"> </span></p><p style="text-indent:32px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:16px"><span style="font-family:宋體">將沖擊電流發(fā)生器發(fā)生的</span><span style="font-family:宋體">8／20μs、100A的沖擊電流波作用于動(dòng)作記數(shù)器，若記數(shù)器動(dòng)作正常，則說(shuō)明儀器良好，否則應(yīng)解體檢修。例如某電業(yè)局曾用此法對(duì)27只記數(shù)器進(jìn)行檢測(cè)，其中有3只不動(dòng)作，解體發(fā)現(xiàn)內(nèi)部元件受潮、損壞。</span></span></p><p style="text-indent:32px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:16px"> </span></p><p style="text-indent:32px;line-height:150%"><span style=";font-family:宋體;line-height:150%;font-size:16px"><span style="font-family:宋體">《規(guī)程》規(guī)定，連續(xù)測(cè)試</span><span style="font-family:宋體">3～5次，每次應(yīng)正常動(dòng)作，每次時(shí)間間隔不少于30s。測(cè)試后記錄器應(yīng)調(diào)到0。</span></span></p><p style="text-align: center"><img style="max-width:800px;max-height:300%;" src="https://img51.chem17.com/9/20231010/638325197581780686375.png" title="}6UTO$~UA_NFSPYVT)VFEJH.png" alt="}6UTO$~UA_NFSPYVT)VFEJH.png"/></p><p><br/></p> <div id="iqaqewgi6e" class="clear"></div> </div> <div id="iqaqewgi6e" class="article"> <p>上一篇：<a href="/Article-3494392.html">高壓交流驗(yàn)電器概述</a></p> <p>下一篇：<a href="/Article-3494374.html">雷擊計(jì)數(shù)器校驗(yàn)儀技術(shù)參數(shù)及性能</a></p> </div> <div id="iqaqewgi6e" class="clear"></div> </div> </div> <div id="iqaqewgi6e" class="n-9"> <div id="iqaqewgi6e" class="c-right"> <div id="iqaqewgi6e" class="c-1 r-pro"> <div id="iqaqewgi6e" class="c-left"> <div id="iqaqewgi6e" class="h-2"><a href="/products.html">產(chǎn)品分類</a></div> 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