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href="/article.html">技術(shù)文章</a> > 便攜式直流高壓發(fā)生器經(jīng)常出現(xiàn)的問題及使用前準(zhǔn)備</div> <div id="quimsyk" class="inpage_content"> <div id="quimsyk" class="nr_main_box"> <h1 class="inside_rnewtil">便攜式直流高壓發(fā)生器經(jīng)常出現(xiàn)的問題及使用前準(zhǔn)備</h1> <div id="quimsyk" class="inside_rnewtime">點(diǎn)擊次數(shù)：971 更新時(shí)間：2020-06-21</div> <div id="quimsyk" class="inside_rnewcon"><p>便攜式直流高壓發(fā)生器<span style="color:rgb(255, 0, 0)"><strong>使用前準(zhǔn)備</strong></span></p><p>1、直流高壓發(fā)生器在使用前的準(zhǔn)備工作。</p><p>⑴直流發(fā)生器在使用前應(yīng)檢查其完好性,聯(lián)接電纜線不應(yīng)有斷路和短路，設(shè)備無破裂等損壞。</p><p>⑵將機(jī)箱、倍壓筒放置到合適的安全的位置，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)并確保接地良好。嚴(yán)禁各接地線相互串聯(lián)使用，以免擊穿時(shí)地電位抬高形成反擊，損壞儀器。</p><p>⑶檢查電源開關(guān)是否在關(guān)斷的位置上，并檢查調(diào)壓電位器應(yīng)在零位上,過電壓保護(hù)整定撥盤開關(guān)設(shè)置在適當(dāng)?shù)奈恢蒙?，一般?.10～1.20倍測試電壓值。</p><p>2、空載升壓驗(yàn)證過電壓保護(hù)整定值</p><p>⑴請認(rèn)準(zhǔn)電源是單相交流220V，50Hz.接通電源開關(guān),此時(shí)綠燈亮,表示電源接通。</p><p>⑵按紅色按鈕，則紅燈亮，表示高壓接通。</p><p>⑶順時(shí)針方向平緩調(diào)節(jié)調(diào)壓電位器，輸出端即從零開始升壓。電壓表顯示為負(fù)載試品上的電壓（KV）值，電流表則顯示試品上流過的電流與所有泄漏電流之和，電流以微安（uA）為單位。升到所需的電壓后，按規(guī)定時(shí)間記錄電流表讀數(shù)，并檢查控制箱及輸出電纜有無異?，F(xiàn)象及聲響。</p><p>⑷降壓，將調(diào)壓電位器回零后，隨后按綠色按鈕，切斷高壓并關(guān)閉電源開關(guān)。</p><p>3、對試品進(jìn)行泄漏及直流耐壓試驗(yàn)</p><p>⑴在做負(fù)載試驗(yàn)前，將高壓屏蔽微安表安裝到倍壓筒上的高壓輸出端上，并將配套的高壓線分別接到微安表上和被試品上。</p><p>⑵檢查儀器、放電棒、倍壓筒、試品聯(lián)接線、接地線是否正確，接地線聯(lián)接是否可靠，檢查高壓安全距離是否符合要求，方可開始進(jìn)行試品的高壓試驗(yàn)。</p><p>⑶檢查確認(rèn)儀器等無異常情況后，接通單相交流220V電源開關(guān)，此時(shí)綠燈亮，表示電源接通。可開始進(jìn)行試品的直流泄漏和直流耐壓試驗(yàn)。</p><p>⑷按紅色按鈕，則紅燈亮，表示高壓接通，待升高壓。</p><p>⑸順時(shí)針方向平緩調(diào)節(jié)調(diào)壓電位器,輸出端即從零開始升壓。升壓速度以每秒3-5kV上升試驗(yàn)電壓為宜。對于大電容試品升壓時(shí)則需要緩慢升壓，否則可能導(dǎo)致電壓過沖,還需監(jiān)視電流表充電電流不超過直流發(fā)生器的大充電電流。當(dāng)升到所需的電壓或電流后，按規(guī)定時(shí)間記錄電流表及電壓表的讀數(shù)。</p><p>⑹試驗(yàn)完畢后，降壓，將調(diào)壓電位器回零后，隨后按綠色按鈕，切斷高壓并關(guān)閉電源開關(guān)。</p><p>⑺試驗(yàn)完畢后，應(yīng)用放電棒對試品進(jìn)行多次放電，放電后方可靠近試品和拆線工作(放電請?jiān)敿?xì)見放電棒使用說明書)。對小電容試品如氧化鋅避雷器、磁吹避雷器等緩緩調(diào)節(jié)調(diào)壓電位器升壓到所需的電壓(電流)值，然后從數(shù)顯表上讀出電壓(電流)數(shù)值。如需對氧化鋅避雷器進(jìn)行75%VDC-1mA的測量時(shí)，應(yīng)先升到電流到1000uA時(shí)電壓值停止(這時(shí)可記錄電壓、電流值)，然后按下黃色按鈕,電壓即降到原來的75%,并保持此狀態(tài)。此時(shí)可讀取微安表數(shù)值及電壓值。測量完畢后,調(diào)壓電位器逆時(shí)針回到零位,按下綠色按鈕,需再次升壓時(shí)按紅色按鈕即可。對大電容試品時(shí)，升壓應(yīng)更要緩慢，并需要監(jiān)視電流表充電電流不超過發(fā)生器的大充電電流，一定要放慢升壓速度,避免充電電流過大。試驗(yàn)完畢后，將電壓調(diào)節(jié)電位器逆時(shí)針回到零位上，隨后按綠色按鈕，切斷高壓，此時(shí)先不要關(guān)閉電源，電壓表顯示還有電壓值，此為存電電壓，等電壓降到2000V左右,方可用放電棒進(jìn)行多次放電，確保安全。</p><p>4、在使用過程中發(fā)現(xiàn)紅燈滅，綠燈亮，直流高壓下降，即為有關(guān)保護(hù)動作。此時(shí)應(yīng)按下列步驟操作:</p><p>⑴將調(diào)壓電位器退回零位。</p><p>⑵關(guān)閉電源開關(guān),面板指示燈均不亮。</p><p>⑶一分鐘后,待機(jī)內(nèi)低壓電容器充分放電后，才允許再次打開電源開關(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)。</p><p>5、注意：做電纜試驗(yàn)時(shí)，要安裝限流電阻使用。（做其它試驗(yàn)時(shí)，不能使用限流電阻）</p></div> 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