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href="/article.html">技術(shù)文章</a> > 真空度真空開關(guān)測試儀測算原理工作原理</div> <div id="pvhr3jx3r5" class="inpage_content"> <div id="pvhr3jx3r5" class="nr_main_box"> <h1 class="inside_rnewtil">真空度真空開關(guān)測試儀測算原理工作原理</h1> <div id="pvhr3jx3r5" class="inside_rnewtime">點(diǎn)擊次數(shù)：576 更新時(shí)間：2023-09-17</div> <div id="pvhr3jx3r5" class="inside_rnewcon"><p><strong><span style="font-size: 16px;">真空度真空開關(guān)測試儀測算原理工作原理</span></strong></p><p style="text-indent:43px;line-height:150%"><span style="font-size: 16px;"><span style="line-height: 150%; font-family: 仿宋_GB2312;">本儀器采用磁控放電法進(jìn)行測量。將真空開關(guān)滅弧室的兩觸頭拉開一定的距離，施加電場脈沖高壓，將滅弧室置于螺線管圈內(nèi)或?qū)⑿滦碗姶啪€圈置于滅弧室外側(cè)，向線圈通以大電流，從而在滅弧室內(nèi)產(chǎn)生與高壓同步的脈沖磁場。這樣，在脈沖強(qiáng)磁場和強(qiáng)電場的作用下，滅弧室中的帶電離子作螺旋運(yùn)動(dòng)，并與殘余氣體分子發(fā)生碰撞電離，所產(chǎn)生的離子電流與殘余氣體密度即真空度近似成比例關(guān)系。</span><strong><span style="line-height: 150%; font-family: 仿宋_GB2312;">對(duì)于不同的真空管型號(hào)（管型），由于其結(jié)構(gòu)不同，在同等觸頭開距、同等真空度、同等電場與磁場的條件下，離子電流的大小也不相同。</span></strong><span style="line-height: 150%; font-family: 仿宋_GB2312;">通過實(shí)驗(yàn)可以標(biāo)定出各種管型的真空度與離子電流間的對(duì)應(yīng)關(guān)系曲線。當(dāng)測知離子電流后，就可以通過查詢該管型的離子電流一真空度曲線獲得該管型的真空度。</span></span></p><p style="text-indent:32px;line-height:150%"><span style="font-size: 16px;"><span style="line-height: 150%; font-size: 16px; font-family: 仿宋_GB2312;">在常規(guī)磁控放電測試滅弧室的真空度時(shí)，為了提高其測試靈敏度，需從斷路器上卸下滅弧室，并置于螺線管線管內(nèi)。這樣一來，滅弧室在重新裝回?cái)嗦菲鲿r(shí)需要調(diào)整機(jī)械參數(shù)，工作量很大并需專業(yè)人員。</span><strong><span style="line-height: 150%; font-size: 16px; font-family: 仿宋_GB2312;">而使用新型磁控線圈可以從側(cè)面包圍滅弧室，這樣就不必拆卸滅弧室。而采用單片微</span></strong><strong></strong></span></p><p style="line-height:150%"><strong style="font-size: 16px;"><span style="line-height: 150%; font-family: 仿宋_GB2312;">機(jī)進(jìn)行同步控制與數(shù)據(jù)采集處理，提高了滅弧室真空度的現(xiàn)場測試靈敏度。</span></strong></p><p style="line-height:150%"><span style="font-size: 16px;"><strong><span style="line-height: 150%; font-size: 16px; font-family: 仿宋_GB2312;"><strong style="white-space: normal;"><span style="font-size: 16px;">真空度真空開關(guān)測試儀工作原理</span></strong></span></strong></span></p><p style="line-height:33px"><span style="font-family: 仿宋_GB2312; font-size: 16px;">真空度測試儀框圖如圖1所示。</span></p><p style="text-align: center"><img style="max-width:800px;max-height:300%;" src="https://img57.chem17.com/9/20230917/638305364721514281537.png" title="PQ4RF9LIQ`GI8E$P%EJ5HU9.png" alt="PQ4RF9LIQ`GI8E$P%EJ5HU9.png"/></p><p style="text-align: center"><img style="max-width: 800px; max-height: 300%; width: 455px; height: 486px;" src="https://img57.chem17.com/9/20230917/638305364943857113156.png" title="_)7GY974S)}V7W}LVTU.png" alt="_)7GY974S)}V7W}LVTU.png" width="455" height="486"/></p><p style="text-align:center;line-height:33px"><span style=";font-family:宋體;font-size:19px"><span style="font-family:宋體">圖</span><span style="font-family:Calibri">2</span></span><span style=";font-family:Calibri;font-size:19px"> </span><span style=";font-family:宋體;font-size:19px"><span style="font-family:宋體">放電波形圖</span></span><strong></strong></p><p style="text-indent:43px;line-height:150%"><span style="font-family: 仿宋_GB2312; line-height: 150%; font-size: 16px;">整機(jī)由測量控制電路、電場高壓產(chǎn)生電路、磁場線圈電流控制電路、通訊、打印機(jī)、液晶顯示電路等組成。其工作過程為：由測量控制電路發(fā)出指令，由開關(guān)電源給磁場電容充電，通過控制電路監(jiān)控，當(dāng)磁場電容上的電壓達(dá)到預(yù)定值后，控制電路發(fā)出兩路控制信號(hào)分別控制電場高壓的輸出和磁場線圈電流的導(dǎo)通，使滅弧室處于強(qiáng)電場、強(qiáng)磁場的狀態(tài)中，滅弧室開始放電，產(chǎn)生離子電流I，如圖2中的曲線I所示。該電流經(jīng)取樣電阻R和預(yù)處理電路后輸入單片機(jī)，最后經(jīng)運(yùn)算由液晶顯示屏顯示測得的真空度值。</span></p><p><br/></p></div> <div id="pvhr3jx3r5" class="inside_newsthree"> <p id="newsprev">上一篇：<b class="newsprev"><a href="/Article-3480566.html">使用直流高壓發(fā)生器的三種測試方法</a></b></p> <p id="newsnext">下一篇：<b class="newsnext"><a href="/Article-3477694.html">真空度真空開關(guān)測試儀特點(diǎn)與技術(shù)</a></b></p> <span><a href="/article.html">返回列表>></a></span> </div> </div> </div> </div> </div>    <div class="pvhr3jx3r5" id="z_Footer"> <div id="pvhr3jx3r5" class="pz_down"> <div id="pvhr3jx3r5" 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