描述
2.電流互感器的故障處理
對(duì)于電流互感器的故障出爐方法如下:
(1)發(fā)現(xiàn)CT二次開路,要先分清是哪一組電流回路故障、開路的相別、對(duì)保護(hù)有無影響,匯報(bào)調(diào)度,解除有可能誤動(dòng)的保護(hù)。
(2)盡量減小一次負(fù)荷電流。若CT嚴(yán)重?fù)p傷,應(yīng)轉(zhuǎn)移負(fù)荷,停電處理。
(3)盡快設(shè)法在就近的試驗(yàn)端子上用良好的短接線按圖紙將CT二次短路,再檢查處理開路點(diǎn)。
(4)若短接時(shí)發(fā)現(xiàn)有火花,那么短接應(yīng)該是有效的,故障點(diǎn)應(yīng)該就在短接點(diǎn)以下的回路中,可進(jìn)一步查找。若短接時(shí)沒有火花,則可能短接無效,故障點(diǎn)可能在短接點(diǎn)以前的回路中,可逐點(diǎn)向前變換短接點(diǎn),縮小范圍檢查。
(5)在故障范圍內(nèi),應(yīng)檢查容易發(fā)生故障的端子和元件。對(duì)檢查出的故障,能自行處理的,如接線端子等外部元件松動(dòng)、接觸不良等,立即處理后投入所退出的保護(hù)。若開路點(diǎn)在CT本體的接線端子上,則應(yīng)停電處理。
3.互感器運(yùn)用中要注意的事項(xiàng)
互感器在安裝現(xiàn)場(chǎng)要注意的事項(xiàng)包括以下三點(diǎn):
(1)一次繞組重復(fù)工頻耐壓試驗(yàn)應(yīng)在規(guī)定電壓值的80%下進(jìn)行。
(2)電壓互感器二次繞組不得短路,否則互感器將被燒毀。
(3)電流互感器一次有電流通過時(shí),二次繞組不得開路,否則二次產(chǎn)生高壓,對(duì)產(chǎn)品性能和人身安全有影響。當(dāng)電流互感器有繞阻不用時(shí)要短路。
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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》
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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。
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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(西門子):Siemens MOORE,Siemens Simatic C1,Siemens數(shù)控系統(tǒng)等。
⑩Bosch Rexroth(博世力士樂):Indramat,I/O模塊,PLC控制器,驅(qū)動(dòng)模塊等。
◆Motorola(摩托羅拉):MVME 162、MVME 167、MVME1772、MVME177等系列。
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