描述
接線(xiàn)比較復(fù)雜,因?yàn)橐话愕碾娏骰ジ衅麟娏骷拥筋~定值時(shí),電壓已達(dá)400V以上,單用調(diào)壓器無(wú)法升到試驗(yàn)電壓,所以還必須再接一個(gè)升壓變(其高壓側(cè)輸出電流需大于或等于電流互感器二次側(cè)額定電流)升壓和一個(gè)PT讀取電壓。
試驗(yàn)前應(yīng)將電流互感器二次繞組引線(xiàn)和接地線(xiàn)均拆除。試驗(yàn)時(shí),一次側(cè)開(kāi)路,從電流互感器本體二次側(cè)施加電壓,可預(yù)先選取幾個(gè)電流點(diǎn),逐點(diǎn)讀取相應(yīng)電壓值。通入的電流或電壓以不超過(guò)制造廠技術(shù)條件的規(guī)定為準(zhǔn)。當(dāng)電壓稍微增加一點(diǎn)而電流增大很多時(shí),說(shuō)明鐵芯已接近飽和,應(yīng)極其緩慢地升壓或停止試驗(yàn)。試驗(yàn)后,根據(jù)試驗(yàn)數(shù)據(jù)繪出伏安特性曲線(xiàn)。
三注意事項(xiàng)
1.電流互感器的伏安特性試驗(yàn),只對(duì)繼電保護(hù)有要求的二次繞組進(jìn)行。
2.測(cè)得的伏安特性曲線(xiàn)與過(guò)去或出廠的伏安特性曲線(xiàn)比較,電壓不應(yīng)有顯著降低。若有顯著降低,應(yīng)檢查二次繞組是否存在匝間短路。當(dāng)有匝間短路時(shí),其曲線(xiàn)開(kāi)始部分電流較正常的略低,如圖中曲線(xiàn)2、3所示(指保護(hù)CT有匝間短路,曲線(xiàn)2為短路1匝,曲線(xiàn)3為短路2匝),因此,在進(jìn)行測(cè)試時(shí),在開(kāi)始部分應(yīng)多測(cè)幾點(diǎn)。
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主營(yíng):世界知名品牌的PLC、DCS系統(tǒng)備件模塊
①Allen-Bradley(美國(guó)AB)系列產(chǎn)品》
②Schneider(施耐德電氣)系列產(chǎn)品》
③General electric(通用電氣)系列產(chǎn)品》
④Westinghouse(美國(guó)西屋)系列產(chǎn)品》
⑤SIEMENS(西門(mén)子系列產(chǎn)品)》
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⑦estinghouse(西屋):OVATION系統(tǒng)、WDPF系統(tǒng)、MAX1000系統(tǒng)備件。
⑧Invensys Foxboro(??怂共_):I/A Series系統(tǒng),F(xiàn)BM(現(xiàn)場(chǎng)輸入/輸出模塊)
順序控制、梯形邏輯控制、事故追憶處理、數(shù)模轉(zhuǎn)換、輸入/輸出信號(hào)處理、數(shù)
據(jù)通信及處理等。Invensys Triconex:冗余容錯(cuò)控制系統(tǒng)、基于三重模件冗余(TMR)
結(jié)構(gòu)的zui現(xiàn)代化的容錯(cuò)控制器。
⑨Siemens(西門(mén)子):Siemens MOORE,Siemens Simatic C1,Siemens數(shù)控系統(tǒng)等。
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◆Motorola(摩托羅拉):MVME 162、MVME 167、MVME1772、MVME177等系列。
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