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如何來(lái)鑒別電流互感器有沒(méi)有出現(xiàn)異常損壞?
Publisher:admin Time:2013/9/28 16:49:18 Click:5170
小編教大家一招來(lái)鑒定判別
電流互感器
是否存在損壞的好方法,我們可以利用伏安的特性原理,因?yàn)殡娏骰ジ衅鞯蔫F心是處在逐漸飽和的狀態(tài)下的,如果在短路的電流下,那么
電流互感器
的鐵心就會(huì)慢慢趨向于飽和,假如勵(lì)磁電流以超快的速度上升的話,那么在電流中的勵(lì)磁電流占的比例就會(huì)加大很多,就會(huì)造成比差逐漸變成負(fù)值且會(huì)不斷加大負(fù)值。因?yàn)槔^電器的動(dòng)作電流是高出額定電流好多倍的,所以電流互感器在這樣的短路電流下要確保繼電器是能夠正常穩(wěn)定地運(yùn)作。
怎么樣才能達(dá)到上述中提出的要求呢,那么就要在使用電流互感器之前先采用伏安特性作出10%的誤差曲線,在測(cè)量伏安特性曲線的時(shí)候還可以同時(shí)進(jìn)行二次線圈的檢查,主要檢查它有沒(méi)有出現(xiàn)匝間短路。
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