直流高壓發生器你知道如何使用嗎?

如做容性負載試驗時，一定要接上限流電阻。

1.試(shi)驗器在使用前應(ying)檢查(cha)其完好性，聯接電(dian)纜不(bu)應(ying)有(you)斷路(lu)和(he)短(duan)路(lu)，設(she)備無(wu)破(po)裂等(deng)損壞(huai)。

2.將機(ji)箱、倍壓(ya)筒(tong)放置到合適(shi)位置分別聯接(jie)(jie)好(hao)電(dian)源(yuan)線(xian)、電(dian)纜線(xian)和接(jie)(jie)地(di)(di)(di)(di)線(xian)，保護接(jie)(jie)地(di)(di)(di)(di)線(xian)與(yu)工作接(jie)(jie)地(di)(di)(di)(di)線(xian)以及放電(dian)棒(bang)的接(jie)(jie)地(di)(di)(di)(di)線(xian)均應單獨接(jie)(jie)到試品(pin)的地(di)(di)(di)(di)線(xian)上(即一點(dian)接(jie)(jie)地(di)(di)(di)(di))。嚴禁各(ge)接(jie)(jie)地(di)(di)(di)(di)線(xian)相(xiang)互(hu)串聯。為此，應使用DHV接(jie)(jie)地(di)(di)(di)(di)線(xian)。

3.電(dian)(dian)(dian)源開(kai)關放在關斷位(wei)置并檢查調壓電(dian)(dian)(dian)位(wei)器應在零(ling)位(wei)。過電(dian)(dian)(dian)壓保(bao)護整定值一般為試驗電(dian)(dian)(dian)壓的1．1倍。

4.空載升壓驗證過電(dian)壓保護(hu)整定是(shi)否(fou)靈敏(min)。

5.接(jie)通電源(yuan)開關，此時紅(hong)燈亮，表(biao)示電源(yuan)接(jie)通。

6.按(an)綠色按(an)鈕，則綠燈亮，表示高(gao)壓接通。

7.順時(shi)(shi)針(zhen)方(fang)向(xiang)平緩調(diao)節調(diao)壓(ya)(ya)(ya)電(dian)位器，輸出(chu)端即(ji)從零開(kai)始升壓(ya)(ya)(ya)，升至所需電(dian)壓(ya)(ya)(ya)后，按規定時(shi)(shi)間記錄電(dian)流表(biao)讀數，并檢(jian)查控制箱及(ji)高壓(ya)(ya)(ya)輸出(chu)線(xian)有無(wu)異常現象(xiang)及(ji)聲(sheng)響(xiang)。

8.降壓(ya)，將(jiang)調壓(ya)電位器回(hui)零后(hou)，隨即(ji)按紅色(se)按鈕，切(qie)斷高壓(ya)并關(guan)閉電源開關(guan)。

9.對試(shi)品(pin)進行泄漏(lou)及直流(liu)耐(nai)壓試(shi)驗(yan)。在進行檢查試(shi)驗(yan)確認試(shi)驗(yan)器(qi)無異常情況后，即可開(kai)始進行試(shi)品(pin)的泄漏(lou)及直流(liu)耐(nai)壓試(shi)驗(yan)。將試(shi)品(pin)、地(di)線等聯接好(hao)，檢查無誤后即打開(kai)電(dian)源(yuan)。

10.升壓(ya)(ya)至(zhi)所需(xu)(xu)電(dian)(dian)壓(ya)(ya)或電(dian)(dian)流(liu)。升壓(ya)(ya)速度(du)以(yi)每秒3—5kV試(shi)驗(yan)(yan)電(dian)(dian)壓(ya)(ya)為宜。對(dui)(dui)于大(da)(da)電(dian)(dian)容(rong)試(shi)品升壓(ya)(ya)時(shi)還需(xu)(xu)監視電(dian)(dian)流(liu)表充電(dian)(dian)電(dian)(dian)流(liu)不(bu)超(chao)過試(shi)驗(yan)(yan)器的(de)大(da)(da)充電(dian)(dian)電(dian)(dian)流(liu)。對(dui)(dui)小(xiao)電(dian)(dian)容(rong)試(shi)品如(ru)(ru)氧(yang)化鋅(xin)避(bi)(bi)雷(lei)器、磁吹避(bi)(bi)雷(lei)器等先升至(zhi)所需(xu)(xu)電(dian)(dian)壓(ya)(ya)(電(dian)(dian)流(liu))的(de)95％，再緩慢(man)仔細升至(zhi)所需(xu)(xu)的(de)電(dian)(dian)壓(ya)(ya)(電(dian)(dian)流(liu))。然后(hou)從數顯表上讀出電(dian)(dian)壓(ya)(ya)(電(dian)(dian)流(liu))值。如(ru)(ru)需(xu)(xu)對(dui)(dui)氧(yang)化鋅(xin)避(bi)(bi)雷(lei)器進行0.75UDC—1mA測(ce)量時(shi)，先升至(zhi)UDC1mA電(dian)(dian)壓(ya)(ya)值，然后(hou)按(an)(an)下黃色按(an)(an)鈕(niu)(niu)，此時(shi)電(dian)(dian)壓(ya)(ya)即降至(zhi)原來的(de)75％，并保(bao)持此狀態。此時(shi)可(ke)讀取(qu)電(dian)(dian)流(liu)。測(ce)量完(wan)畢后(hou)，調壓(ya)(ya)電(dian)(dian)位器逆時(shi)針回(hui)到零，按(an)(an)下綠色按(an)(an)鈕(niu)(niu)。需(xu)(xu)再次升壓(ya)(ya)時(shi)按(an)(an)紅色按(an)(an)鈕(niu)(niu)即可(ke)。

必要時用外接高壓分壓器比對控制箱(xiang)上的電(dian)壓。

11.試驗完畢，降(jiang)壓，關閉電(dian)源。

12.直流高壓發生器幾種測(ce)量方法

1)一般(ban)測量(liang)時，當(dang)接(jie)好線后，先(xian)把聯(lian)接(jie)試(shi)品的線懸空，升到(dao)試(shi)驗(yan)電壓(ya)后讀取(qu)空試(shi)時的電暈和雜散電流I，然(ran)后接(jie)上試(shi)品升到(dao)試(shi)驗(yan)電壓(ya)讀取(qu)總電流Ⅰ1；試(shi)品泄(xie)漏電流：Io =Ⅰ1—I’

2)當需(xu)要(yao)測量被試品泄漏(lou)電流(liu)時，則(ze)應在高壓側串入高壓微(wei)安表(見下圖)

微安表(biao)必須有金(jin)屬屏蔽(bi)(bi)，應采用屏蔽(bi)(bi)線(xian)(xian)與(yu)試(shi)品(pin)聯(lian)接(jie)。高壓(ya)引線(xian)(xian)的屏蔽(bi)(bi)引出應與(yu)儀表(biao)端(duan)的屏蔽(bi)(bi)緊密聯(lian)接(jie)。如果(guo)試(shi)品(pin)表(biao)面污穢要排(pai)除試(shi)品(pin)表(biao)面泄漏電流的影響可在試(shi)品(pin)高電位端(duan)用裸金(jin)屬軟線(xian)(xian)緊密繞(rao)幾圈后與(yu)高壓(ya)引線(xian)(xian)的屏蔽(bi)(bi)相聯(lian)接(jie)(見下圖)。

3)對氧(yang)化鋅、磁(ci)吹(chui)避雷(lei)器(qi)等(deng)試(shi)品(pin)(pin)(pin)(pin)接地(di)端可拆開(kai)的情況下，也可采(cai)用在(zai)試(shi)品(pin)(pin)(pin)(pin)的底部(地(di)電位側)串入電流表(biao)進行(xing)測量的方式。 當要排(pai)除試(shi)品(pin)(pin)(pin)(pin)表(biao)面泄漏電流的影響，可用軟的裸銅線(xian)在(zai)試(shi)品(pin)(pin)(pin)(pin)地(di)電位端繞上幾圈(quan)并(bing)與屏蔽線(xian)的屏蔽相聯接(見下圖)

13.對于(yu)氧(yang)化(hua)鋅避雷器等(deng)小電(dian)(dian)容試品一(yi)般通(tong)過測壓電(dian)(dian)阻放電(dian)(dian)時間很(hen)快。而對電(dian)(dian)纜等(deng)大電(dian)(dian)容試品一(yi)般要待試品電(dian)(dian)壓自放電(dian)(dian)至試驗電(dian)(dian)壓的(de)20％以(yi)下，再通(tong)過配套(tao)的(de)放電(dian)(dian)棒進行(xing)放電(dian)(dian)。待試品充分(fen)放電(dian)(dian)后掛(gua)好接(jie)地線(xian)，才允(yun)許進行(xing)高壓引(yin)線(xian)的(de)拆除(chu)和更(geng)換(huan)接(jie)線(xian)工作。

14.保(bao)護動作(zuo)后的操作(zuo)

在(zai)使用過程中發(fa)現綠燈(deng)(deng)滅，紅(hong)燈(deng)(deng)亮，電(dian)(dian)壓下降，即(ji)為有關保護(hu)動作。此時應關閉(bi)電(dian)(dian)源開(kai)關，面(mian)板指示燈(deng)(deng)均(jun)不亮。將(jiang)調(diao)壓電(dian)(dian)位器(qi)退(tui)回(hui)零位，一(yi)分(fen)鐘后待機內低壓電(dian)(dian)容器(qi)充(chong)分(fen)放電(dian)(dian)后才允許(xu)再次打開(kai)電(dian)(dian)源開(kai)關。重新進行(xing)空(kong)載(zai)試驗(yan)并查明(ming)情況(kuang)后可再次升壓試驗(yan)。