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class="Navlist w1000"> <ul> <li id="Top1"></li> </ul> <div id="zbbbnpu2h4x" class="clear"></div> </div> <div id="zbbbnpu2h4x" class="clear"></div> </div> <div id="zbbbnpu2h4x" class="clear"></div> </div> <div id="zbbbnpu2h4x" class="blockindex h450"> <div id="zbbbnpu2h4x" class="new9"> <div id="zbbbnpu2h4x" class="new91"> <h1>直流高壓發(fā)生器【上?？档请姎狻渴褂梅椒?/h1> 發(fā)布時(shí)間：2024-06-06 </div> <div id="zbbbnpu2h4x" class="new92"> <div class="zbbbnpu2h4x" id="contentt"></div> 直流高壓發(fā)生器【上?？档请姎狻渴褂梅椒?br>1.試驗(yàn)器在使用前應(yīng)檢查其完好性，聯(lián)接電纜不應(yīng)有斷路和短路，設(shè)備無(wú)破裂等損壞。<br>2.將機(jī)箱、倍壓筒放置到合適位置分別聯(lián)接好電源線、電纜線和接地線，保護(hù)接地線與工作接地線以及放電棒的接地線均應(yīng)單獨(dú)接到試品的地線上(即一點(diǎn)接地)。嚴(yán)禁各接地線相互串聯(lián)。為此，應(yīng)使用dhv接地線。<br>3.電源開(kāi)關(guān)放在關(guān)斷位置并檢查調(diào)壓電位器應(yīng)在零位。過(guò)電壓保護(hù)整定值一般為試驗(yàn)電壓的1．1倍。<br>4.空載升壓驗(yàn)證過(guò)電壓保護(hù)整定是否靈敏。<br>5.接通電源開(kāi)關(guān)，此時(shí)紅燈亮，表示電源接通。<br>6.按綠色按鈕，則綠燈亮，表示高壓接通。<br>7.順時(shí)針?lè)较蚱骄徴{(diào)節(jié)調(diào)壓電位器，輸出端即從零開(kāi)始升壓，升至所需電壓后，按規(guī)定時(shí)間記錄電流表讀數(shù)，并檢查控制箱及高壓輸出線有無(wú)異?，F(xiàn)象及聲響。<br>8.降壓，將調(diào)壓電位器回零后，隨即按紅色按鈕，切斷高壓并關(guān)閉電源開(kāi)關(guān)。<br>9.對(duì)試品進(jìn)行泄漏及直流耐壓試驗(yàn)。在進(jìn)行檢查試驗(yàn)確認(rèn)試驗(yàn)器無(wú)異常情況后，即可開(kāi)始進(jìn)行試品的泄漏及直流耐壓試驗(yàn)。將試品、地線等聯(lián)接好，檢查無(wú)誤后即打開(kāi)電源。<br>10.升壓至所需電壓或電流。升壓速度以每秒3—5kv試驗(yàn)電壓為宜。對(duì)于大電容試品升壓時(shí)還需監(jiān)視電流表充電電流不超過(guò)試驗(yàn)器的大充電電流。對(duì)小電容試品如氧化鋅避雷器、磁吹避雷器等先升至所需電壓(電流)的95％，再緩慢仔細(xì)升至所需的電壓(電流)。然后從數(shù)顯表上讀出電壓(電流)值。如需對(duì)氧化鋅避雷器進(jìn)行0.75udc—1ma測(cè)量時(shí)，先升至udc1ma電壓值，然后按下黃色按鈕，此時(shí)電壓即降至原來(lái)的75％，并保持此狀態(tài)。此時(shí)可讀取電流。測(cè)量完畢后，調(diào)壓電位器逆時(shí)針回到零，按下綠色按鈕。需再次升壓時(shí)按紅色按鈕即可。<br>必要時(shí)用外接高壓分壓器比對(duì)控制箱上的電壓。<br>11.試驗(yàn)完畢，降壓，關(guān)閉電源。<br>12.幾種測(cè)量方法<br>1)一般測(cè)量時(shí)，當(dāng)接好線后，先把聯(lián)接試品的線懸空，升到試驗(yàn)電壓后讀取空試時(shí)的電暈和雜散電流i，然后接上試品升到試驗(yàn)電壓讀取總電流ⅰ1；試品泄漏電流：io =ⅰ1—i’<br>2)當(dāng)需要測(cè)量被試品泄漏電流時(shí)，則應(yīng)在高壓側(cè)串入高壓微安表(見(jiàn)下圖)<br>微安表必須有金屬屏蔽，應(yīng)采用屏蔽線與試品聯(lián)接。高壓引線的屏蔽引出應(yīng)與儀表端的屏蔽緊密聯(lián)接。如果試品表面污穢要排除試品表面泄漏電流的影響可在試品高電位端用裸金屬軟線緊密繞幾圈后與高壓引線的屏蔽相聯(lián)接(見(jiàn)下圖)。<br>3)對(duì)氧化鋅、磁吹避雷器等試品接地端可拆開(kāi)的情況下，也可采用在試品的底部(地電位側(cè))串入電流表進(jìn)行測(cè)量的方式。當(dāng)要排除試品表面泄漏電流的影響，可用軟的裸銅線在試品地電位端繞上幾圈并與屏蔽線的屏蔽相聯(lián)接(見(jiàn)下圖)<br>13.對(duì)于氧化鋅避雷器等小電容試品一般通過(guò)測(cè)壓電阻放電時(shí)間很快。而對(duì)電纜等大電容試品一般要待試品電壓自放電至試驗(yàn)電壓的20％以下，再通過(guò)配套的放電棒進(jìn)行放電。待試品充分放電后掛好接地線，才允許進(jìn)行高壓引線的拆除和更換接線工作。<br>14.保護(hù)動(dòng)作后的操作<br>在使用過(guò)程中發(fā)現(xiàn)綠燈滅，紅燈亮，電壓下降，即為有關(guān)保護(hù)動(dòng)作。此時(shí)應(yīng)關(guān)閉電源開(kāi)關(guān)，面板指示燈均不亮。將調(diào)壓電位器退回零位，一分鐘后待機(jī)內(nèi)低壓電容器充分放電后才允許再次打開(kāi)電源開(kāi)關(guān)。重新進(jìn)行空載試驗(yàn)并查明情況后可再次升壓試驗(yàn)。<br> <div class="zbbbnpu2h4x" id="contentb"></div> </div> <div id="zbbbnpu2h4x" class="clearfix"></div> </div> <div>上一個(gè)：<a href="n882423.htm">農(nóng)村污水分散式凈化槽</a><br /> 下一個(gè)：<a 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