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異頻介質損耗測試儀 工作原理

點擊次數:41 發布時間:2023-06-05

異(yi)頻介質損耗測試儀 工作原理

頻介質損耗測試儀是發電廠、變電站等現場或實驗室測試各種高壓電力設備介損正切值及電容量的高精度測試儀器。儀器為一體化結構,內置介損測試電橋,可變頻調壓電源,升壓變壓器和SF6 高穩定度標準電容器。測試高壓源由儀器內部的逆變器產生,經變壓器升壓后用于被試品測試。頻率可變為50Hz、47.5Hz\52.5Hz、45Hz\55Hz、60Hz、57.5Hz\62.5Hz、55Hz\65Hz,采用數字陷波技術,避開了工頻電場對測試的干擾,從根本上解決了強電場干擾下準確測量的難題。同時適用于全部停電后用發電機供電檢測的場合。該儀器配以絕緣油杯加溫控裝置可測試絕緣油介質損耗。 

異頻介(jie)質損耗測試儀工作原理
在(zai)交流電(dian)(dian)(dian)(dian)(dian)壓作用(yong)(yong)下(xia),電(dian)(dian)(dian)(dian)(dian)介(jie)(jie)質(zhi)(zhi)(zhi)要消耗(hao)(hao)(hao)部(bu)分電(dian)(dian)(dian)(dian)(dian)能,這部(bu)分電(dian)(dian)(dian)(dian)(dian)能將轉變為(wei)(wei)熱(re)能產生(sheng)損耗(hao)(hao)(hao)。這種能量(liang)(liang)損耗(hao)(hao)(hao)叫做電(dian)(dian)(dian)(dian)(dian)介(jie)(jie)質(zhi)(zhi)(zhi)的(de)(de)(de)損耗(hao)(hao)(hao)。當(dang)電(dian)(dian)(dian)(dian)(dian)介(jie)(jie)質(zhi)(zhi)(zhi)上施加(jia)交流電(dian)(dian)(dian)(dian)(dian)壓時,電(dian)(dian)(dian)(dian)(dian)介(jie)(jie)質(zhi)(zhi)(zhi)中(zhong)的(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)壓和(he)電(dian)(dian)(dian)(dian)(dian)流間(jian)成在(zai)相角(jiao)差ψ,ψ的(de)(de)(de)余角(jiao)δ稱為(wei)(wei)介(jie)(jie)質(zhi)(zhi)(zhi)損耗(hao)(hao)(hao)角(jiao),δ的(de)(de)(de)正切tgδ稱為(wei)(wei)介(jie)(jie)質(zhi)(zhi)(zhi)損耗(hao)(hao)(hao)角(jiao)正切。tgδ值是用(yong)(yong)來衡量(liang)(liang)電(dian)(dian)(dian)(dian)(dian)介(jie)(jie)質(zhi)(zhi)(zhi)損耗(hao)(hao)(hao)的(de)(de)(de)參數。儀器(qi)測(ce)(ce)(ce)量(liang)(liang)線(xian)路(lu)包括一(yi)(yi)標(biao)準(zhun)回(hui)路(lu)(Cn)和(he)一(yi)(yi)被(bei)試(shi)(shi)回(hui)路(lu)(Cx),如圖2—1所(suo)示。標(biao)準(zhun)回(hui)路(lu)由(you)(you)內(nei)(nei)置高穩定度標(biao)準(zhun)電(dian)(dian)(dian)(dian)(dian)容器(qi)與(yu)測(ce)(ce)(ce)量(liang)(liang)線(xian)路(lu)組成,被(bei)試(shi)(shi)回(hui)路(lu)由(you)(you)被(bei)試(shi)(shi)品(pin)和(he)測(ce)(ce)(ce)量(liang)(liang)線(xian)路(lu)組成。測(ce)(ce)(ce)量(liang)(liang)線(xian)路(lu)由(you)(you)取樣(yang)電(dian)(dian)(dian)(dian)(dian)阻與(yu)前(qian)置放大器(qi)和(he)A/D轉換器(qi)組成。通(tong)過(guo)測(ce)(ce)(ce)量(liang)(liang)電(dian)(dian)(dian)(dian)(dian)路(lu)分別測(ce)(ce)(ce)得標(biao)準(zhun)回(hui)路(lu)電(dian)(dian)(dian)(dian)(dian)流與(yu)被(bei)試(shi)(shi)回(hui)路(lu)電(dian)(dian)(dian)(dian)(dian)流幅值及其(qi)相位差,再(zai)由(you)(you)數字信號處(chu)理器(qi)運用(yong)(yong)數字化(hua)實時采集方法,通(tong)過(guo)矢量(liang)(liang)運算得出(chu)試(shi)(shi)品(pin)的(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)容值和(he)介(jie)(jie)質(zhi)(zhi)(zhi)損耗(hao)(hao)(hao)正切值。儀器(qi)內(nei)(nei)部(bu)已經(jing)采用(yong)(yong)了抗干擾措施,保證在(zai)外電(dian)(dian)(dian)(dian)(dian)場(chang)干擾下(xia)準(zhun)確測(ce)(ce)(ce)量(liang)(liang)。
異頻介質損耗測試儀廠家工作原理
圖 2—1  測量原理圖

異頻(pin)介質損(sun)(sun)耗(hao)測(ce)(ce)試儀(yi)是(shi)發電(dian)(dian)(dian)(dian)(dian)廠、變電(dian)(dian)(dian)(dian)(dian)站等現(xian)場(chang)或實驗室測(ce)(ce)試各種高(gao)壓電(dian)(dian)(dian)(dian)(dian)力設備介損(sun)(sun)正切值及電(dian)(dian)(dian)(dian)(dian)容量的高(gao)精度測(ce)(ce)試儀(yi)器(qi)(qi)。儀(yi)器(qi)(qi)為一(yi)體化結構,內(nei)置(zhi)介損(sun)(sun)測(ce)(ce)試電(dian)(dian)(dian)(dian)(dian)橋,可變頻(pin)調壓電(dian)(dian)(dian)(dian)(dian)源,升壓變壓器(qi)(qi)和(he)SF6 高(gao)穩定度標準(zhun)電(dian)(dian)(dian)(dian)(dian)容器(qi)(qi)。適用于(yu)全部停電(dian)(dian)(dian)(dian)(dian)后(hou)用發電(dian)(dian)(dian)(dian)(dian)機(ji)供電(dian)(dian)(dian)(dian)(dian)檢(jian)測(ce)(ce)的場(chang)合。
異頻介質損耗測試儀廠家
異頻(pin)介質(zhi)損耗測(ce)試儀廠(chang)家性能特點
?超大液(ye)晶(jing)中(zhong)文顯示
操作(zuo)簡單(dan),儀器配(pei)備了的(de)全觸(chu)摸(mo)液晶(jing)顯示屏,超大全觸(chu)摸(mo)操作(zuo)界(jie)面,每過程都非常(chang)清晰明了,操作(zuo)人員不需要額外的(de)專業培(pei)訓(xun)就能(neng)使用。輕輕點擊一(yi)下就能(neng)完成整個過程的(de)測量(liang),是(shi)目前非常(chang)理想的(de)智(zhi)能(neng)型介損測量(liang)設備。
?海量存儲數據(ju)
異頻介質損耗(hao)測(ce)試儀內部(bu)配備有日歷芯(xin)片和(he)大容量存儲器,保存數(shu)據200組,能將(jiang)檢(jian)測結果按時(shi)間(jian)順序保存,隨時(shi)可(ke)以(yi)查(cha)看歷史記錄,并可(ke)以(yi)打印輸出。
?科學(xue)先進的數據(ju)管(guan)理
異頻介(jie)質損耗(hao)測試儀數據可以(yi)通過U盤導出,可在任意一臺PC機(ji)上(shang)通過我公(gong)司專用軟件,查看(kan)和管(guan)理數據。
?多種測試模式
異(yi)頻介質損耗測試儀使用內(nei)高壓、內(nei)標準(zhun)的方式測試(shi),正接(jie)法、反接(jie)法、自(zi)激法。
?CVT測(ce)試(shi)一步到位
該儀(yi)器還可以測試全密封的CVT(電(dian)容式電(dian)壓互感器)C1、C2的介損和(he)電(dian)容量。
?不拆高(gao)壓引線測量CVT
儀(yi)器(qi)可在不拆除(chu)CVT高壓(ya)引線的情(qing)況下正確(que)測量CVT的介質損耗值和(he)電(dian)容值。
?CVT反接屏蔽(bi)法測量C0
儀器(qi)可采用(yong)反接(jie)屏(ping)蔽法測量CVT上端C0的介質損耗值和電容(rong)值。
?高速(su)采樣信號
儀器內部(bu)的逆變器和(he)采樣(yang)電(dian)路全部(bu)由數字化控(kong)制,輸出電(dian)壓(ya)連續可調。
?多(duo)重保(bao)護安全可(ke)靠
儀(yi)器具備輸入電壓(ya)波動(dong)、高壓(ya)電流(liu)、輸出短路、電源故障、過(guo)壓(ya)、過(guo)流(liu)、溫度等多重保護措施,保證(zheng)了儀(yi)器安全、可靠。儀(yi)器還具備設置接地檢測功能,確保不接地設備不允許升壓(ya)。

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