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簡要描述:變(bian)頻介質損耗測量(liang)儀 測試(shi)(shi)標(biao)準通過測量(liang)電(dian)路(lu)分(fen)別測得標(biao)準回路(lu)電(dian)流與被試(shi)(shi)回路(lu)電(dian)流幅值及其(qi)相位差,再由數字(zi)信號處理器運(yun)用數字(zi)化實時(shi)采集方法(fa),
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工作原理
變(bian)頻介(jie)(jie)質(zhi)損(sun)耗(hao)(hao)測試儀(yi)在交(jiao)流(liu)電(dian)(dian)(dian)(dian)(dian)(dian)壓作用下,電(dian)(dian)(dian)(dian)(dian)(dian)介(jie)(jie)質(zhi)要消耗(hao)(hao)部分(fen)電(dian)(dian)(dian)(dian)(dian)(dian)能(neng)(neng),這部分(fen)電(dian)(dian)(dian)(dian)(dian)(dian)能(neng)(neng)將轉變(bian)為(wei)熱能(neng)(neng)產生損(sun)耗(hao)(hao)。這種能(neng)(neng)量(liang)(liang)(liang)損(sun)耗(hao)(hao)叫做電(dian)(dian)(dian)(dian)(dian)(dian)介(jie)(jie)質(zhi)的(de)損(sun)耗(hao)(hao)。當電(dian)(dian)(dian)(dian)(dian)(dian)介(jie)(jie)質(zhi)上施加交(jiao)流(liu)電(dian)(dian)(dian)(dian)(dian)(dian)壓時(shi),電(dian)(dian)(dian)(dian)(dian)(dian)介(jie)(jie)質(zhi)中的(de)電(dian)(dian)(dian)(dian)(dian)(dian)壓和(he)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)間成(cheng)在相(xiang)角(jiao)差ψ,ψ的(de)余角(jiao)δ稱(cheng)為(wei)介(jie)(jie)質(zhi)損(sun)耗(hao)(hao)角(jiao),δ的(de)正(zheng)切tgδ稱(cheng)為(wei)介(jie)(jie)質(zhi)損(sun)耗(hao)(hao)角(jiao)正(zheng)切。tgδ值(zhi)是(shi)用來(lai)衡量(liang)(liang)(liang)電(dian)(dian)(dian)(dian)(dian)(dian)介(jie)(jie)質(zhi)損(sun)耗(hao)(hao)的(de)參數(shu)。儀(yi)器(qi)(qi)測量(liang)(liang)(liang)線(xian)(xian)路(lu)(lu)(lu)包括一標準回(hui)路(lu)(lu)(lu)(Cn)和(he)一被試回(hui)路(lu)(lu)(lu)(Cx)。標準回(hui)路(lu)(lu)(lu)由(you)內置高穩(wen)定度標準電(dian)(dian)(dian)(dian)(dian)(dian)容(rong)器(qi)(qi)與(yu)測量(liang)(liang)(liang)線(xian)(xian)路(lu)(lu)(lu)組(zu)成(cheng),被試回(hui)路(lu)(lu)(lu)由(you)被試品(pin)和(he)測量(liang)(liang)(liang)線(xian)(xian)路(lu)(lu)(lu)組(zu)成(cheng)。測量(liang)(liang)(liang)線(xian)(xian)路(lu)(lu)(lu)由(you)取(qu)樣電(dian)(dian)(dian)(dian)(dian)(dian)阻與(yu)前(qian)置放(fang)大器(qi)(qi)和(he)A/D轉換器(qi)(qi)組(zu)成(cheng)。通過測量(liang)(liang)(liang)電(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)分(fen)別測得標準回(hui)路(lu)(lu)(lu)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)與(yu)被試回(hui)路(lu)(lu)(lu)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)幅值(zhi)及其相(xiang)位差,再由(you)數(shu)字信號處(chu)理(li)器(qi)(qi)運(yun)用數(shu)字化實時(shi)采集(ji)方(fang)法,通過矢量(liang)(liang)(liang)運(yun)算(suan)得出(chu)試品(pin)的(de)電(dian)(dian)(dian)(dian)(dian)(dian)容(rong)值(zhi)和(he)介(jie)(jie)質(zhi)損(sun)耗(hao)(hao)正(zheng)切值(zhi)。
變頻介質損耗測量儀 測試標準主要技術參數:
使(shi)用條件 -5℃∽40℃ RH<80%
電 源 AC 220V±10% 頻(pin)率無限制(zhi)
高(gao)壓輸出 1KV∽10KV 每(mei)隔1kV
精 度 5%
最大(da)電流 140mA
容 量 1000VA
自激電源 AC 0V∽30V 45HZ/55HZ
最大電流 15A
分 辨 率 tgδ: 0.001% Cx: 0.1pF
功能特點:
1、儀(yi)器進行故障分析。
2、抗(kang)干(gan)擾(rao)力強,在500KV(甚至更高)電壓等(deng)級下的(de)變(bian)電站(zhan)的(de)現(xian)場也能保(bao)持結(jie)果穩定、可靠,不僅能單頻測試,也可實現(xian)45/55Hz雙頻測試。
3、儀器(qi)的試(shi)驗電壓實行"緩升(sheng)緩降",有效的防止"容(rong)升(sheng)"效應,保護試(shi)品和儀器(qi)的安全。
4、儀器變頻介質損(sun)耗測(ce)試儀實現過(guo)流過(guo)載(zai)的預前保護,能迅(xun)速切(qie)斷試驗(yan)電源,以(yi)保護試品和儀器的安全。
5、儀器(qi)測試電(dian)纜采(cai)用硅橡膠以及(ji)其他特種(zhong)絕緣(yuan)材料復(fu)合制作(zuo)而成,輕便柔軟(ruan),10KV電(dian)壓等級下可(ke)拖(tuo)地使(shi)用。
6、儀器附帶電子萬年歷和大容量(liang)存儲空間(jian),可記憶(yi)100組測試(shi)數(shu)據。
7、儀器帶有標(biao)準的RS232接(jie)口,儀器內大(da)量測試(shi)數據(ju)可上傳(chuan)給大(da)型計算(suan)機使用(yong)。
使用注意事項:
1. 本儀器只能在停(ting)電設備(bei)上使(shi)用,其它設備(bei)可不斷電;
2. 儀器自帶有(you)升(sheng)壓裝置,應(ying)注意高壓引線(xian)的絕緣及人員安全;
3. 儀(yi)器應可靠接地(di);
4. 使用本儀器檢測設(she)備前,應(ying)先對設(she)備進行絕緣檢測;
5. 確定設備的耐壓等級,正確選擇儀器升壓檔位,以(yi)防擊穿設備,損(sun)壞儀器;
6. 儀器變頻介質損耗測量儀 測試標準所配(pei)專用高壓電纜雖出廠時已檢測(ce)合格,但測(ce)量時仍需遠(yuan)離人體;
7. 輸入電壓為AC220V±10%,超出(chu)范圍都有(you)可能影響測試精(jing)度;最(zui)大(da)輸入電壓為AC264V,超過此(ci)值會(hui)造成性損壞,對(dui)此(ci)廠家不予保修;
8. 打(da)印機有可能在搬運過(guo)程中因卷(juan)(juan)紙松動而出現打(da)印卡紙,此時只需(xu)將卷(juan)(juan)紙取出,繞緊后重新裝入;
9. 儀器應注意防(fang)(fang)潮,防(fang)(fang)劇烈(lie)震動;