描述
電流互感器二次端子過熱的原因：未接負載的電流互感器二次側端子短接片未壓時，端子連接處發(fā)熱，電流互感器有時有電磁聲，一旦負荷增大，噪聲也隨著增大，同時與環(huán)境溫度也有密切的聯(lián)系，環(huán)境溫度35攝氏度左右時聲音開始異常。電流互感器可拆卸的電流端子接頭連接不緊密。負荷小時，接頭壓接不緊的端子發(fā)熱不明顯，也不易發(fā)現(xiàn)。當改變運行方式或一次側負荷過大時，一次側的穿越功率增加，電流增大，電流互感器二次側電流也開始隨之增加，壓接不緊的端子便會過熱。電流互感器二次側端子連接片接觸不良造成接觸電阻值增大，電流通過時發(fā)熱，導致局部接觸面溫度逐漸升高，并使周圍的材料受熱升高，箱內(nèi)散熱不好，端子接觸面氧化加快，電阻值進一步增大，長時間加熱加上震動使端子變松，從過熱接觸面開始，發(fā)展過周圍端子排也逐漸過熱燒熔，燒損面積逐漸增大。電流互感器端子質(zhì)量存在問題，如螺栓的螺紋不規(guī)范，絕緣塑料較薄、強度不夠，安裝過程中極易滑絲、損傷或斷裂。
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