全自動抗干擾介損測試儀工作原理及介紹

在(zai)交流電(dian)(dian)(dian)壓(ya)作用(yong)(yong)下，電(dian)(dian)(dian)介(jie)(jie)(jie)質要(yao)消耗(hao)部(bu)分(fen)電(dian)(dian)(dian)能(neng)，這(zhe)部(bu)分(fen)電(dian)(dian)(dian)能(neng)將轉(zhuan)變(bian)為(wei)(wei)(wei)熱能(neng)產(chan)生損耗(hao)。這(zhe)種(zhong)能(neng)量(liang)(liang)損耗(hao)叫做電(dian)(dian)(dian)介(jie)(jie)(jie)質的損耗(hao)。當電(dian)(dian)(dian)介(jie)(jie)(jie)質上(shang)施(shi)加交流電(dian)(dian)(dian)壓(ya)時(shi)，電(dian)(dian)(dian)介(jie)(jie)(jie)質中(zhong)的電(dian)(dian)(dian)壓(ya)和(he)電(dian)(dian)(dian)流間(jian)成(cheng)在(zai)相角(jiao)差ψ，ψ的余角(jiao)δ稱為(wei)(wei)(wei)介(jie)(jie)(jie)質損耗(hao)角(jiao)，δ的正切(qie)tgδ稱為(wei)(wei)(wei)介(jie)(jie)(jie)質損耗(hao)角(jiao)正切(qie)。tgδ值(zhi)(zhi)是(shi)用(yong)(yong)來(lai)衡量(liang)(liang)電(dian)(dian)(dian)介(jie)(jie)(jie)質損耗(hao)的參數。儀(yi)器(qi)(qi)測(ce)量(liang)(liang)線路(lu)(lu)(lu)包括一標準回路(lu)(lu)(lu)(Cn)和(he)一被(bei)試回路(lu)(lu)(lu)(Cx)，如圖1所示。標準回路(lu)(lu)(lu)由(you)內置高穩定度標準電(dian)(dian)(dian)容(rong)器(qi)(qi)與(yu)(yu)測(ce)量(liang)(liang)線路(lu)(lu)(lu)組(zu)成(cheng)，被(bei)試回路(lu)(lu)(lu)由(you)被(bei)試品和(he)測(ce)量(liang)(liang)線路(lu)(lu)(lu)組(zu)成(cheng)。測(ce)量(liang)(liang)線路(lu)(lu)(lu)由(you)取樣電(dian)(dian)(dian)阻與(yu)(yu)前置放大器(qi)(qi)和(he)A/D轉(zhuan)換(huan)器(qi)(qi)組(zu)成(cheng)。通過測(ce)量(liang)(liang)電(dian)(dian)(dian)路(lu)(lu)(lu)分(fen)別測(ce)得標準回路(lu)(lu)(lu)電(dian)(dian)(dian)流與(yu)(yu)被(bei)試回路(lu)(lu)(lu)電(dian)(dian)(dian)流幅值(zhi)(zhi)及其相位差，再(zai)由(you)數字信號(hao)處理器(qi)(qi)運(yun)用(yong)(yong)數字化實時(shi)采(cai)集(ji)方(fang)法，通過矢量(liang)(liang)運(yun)算(suan)得出(chu)試品的電(dian)(dian)(dian)容(rong)值(zhi)(zhi)和(he)介(jie)(jie)(jie)質損耗(hao)正切(qie)值(zhi)(zhi)。

  全自(zi)動抗干(gan)擾介(jie)損測(ce)試(shi)儀是發電(dian)(dian)(dian)廠(chang)、變電(dian)(dian)(dian)站等(deng)現場全自(zi)動測(ce)量(liang)各種高壓電(dian)(dian)(dian)力設備介(jie)損正切值及電(dian)(dian)(dian)容量(liang)的高精度儀器(qi)(qi)。主電(dian)(dian)(dian)源(yuan)由(you)儀器(qi)(qi)內部(bu)的逆變器(qi)(qi)產生，經(jing)變壓器(qi)(qi)升壓后用(yong)于被試(shi)品測(ce)試(shi)。主電(dian)(dian)(dian)源(yuan)的頻率為(wei)45HZ和(he)55HZ，避開(kai)了工頻電(dian)(dian)(dian)場對試(shi)品的干(gan)擾，從根本上(shang)解決了強(qiang)電(dian)(dian)(dian)場干(gan)擾下(xia)準確測(ce)量(liang)的難(nan)題。同時適(shi)用(yong)于全部(bu)停(ting)電(dian)(dian)(dian)后用(yong)發電(dian)(dian)(dian)機(ji)供(gong)電(dian)(dian)(dian)的場合。

  全自(zi)動抗干擾(rao)介損(sun)測試儀配備了大屏幕(240×128)中文(wen)菜(cai)單界面，每一步驟都有中文(wen)提(ti)示，結果可以打印輸(shu)出，操作(zuo)人員不需要專業(ye)培訓就(jiu)能使(shi)用。一次操作(zuo)，微(wei)機自(zi)動完成(cheng)全過程(cheng)的(de)測量，是目前非常(chang)理想的(de)介損(sun)測量設備。

  該(gai)儀器同樣適用于車(che)間、試驗室、科研(yan)單位測量高壓電器設備的(de)tgδ及電容量;配以絕(jue)緣油(you)杯可測試絕(jue)緣油(you)介質損耗。

  該儀(yi)器可用正、反接線方法(fa)測(ce)(ce)量不(bu)接地或直接接地的(de)高壓電(dian)(dian)器設備。同時(shi)還可以測(ce)(ce)試全(quan)密封的(de)CVT(電(dian)(dian)容式(shi)電(dian)(dian)壓互感器)。

  儀器內(nei)部的逆變器和采(cai)樣電(dian)路全(quan)部由數字(zi)化控制，輸出電(dian)壓連續可調(diao)。

  全自動抗干擾介損測試(shi)儀具備(bei)輸(shu)入電壓(ya)波(bo)動、輸(shu)出短路、過壓(ya)、過流(liu)、溫度等多重保護措施(shi),保證了儀器安(an)全.