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二次绕组准确级介绍
1、TPY:TP类是具有暂态特性的保护用电流互感器。TPY级铁芯剩磁不超过饱和磁密的10%。TPY级为小气隙环形铁芯,由于存在小气隙,励磁阻抗减小,二次闭合回路时间常数TS减小,动态剩磁的衰减加快,有利于改善暂态误差。其中T代表暂态,P代表保护,Y代表气隙。
选型原则:330-500kV线路保护、高压侧为330-500kV的变压器保护,和300MW及以上的发电机组保护,由于一次系统时间常数大,TA暂态饱和严重,宜用TP类TA.
例如:500kV线路保护,因超高压线路保护均配置有重合闸,当重合闸合至永久故障线路时,电流互感器处于重复励磁状态,而此时系统又要求线路保护能在20-30ms内再次可靠动作,切除永久故障。这就要求电流互感器满足饱和倍数和暂态误差的要求,选用TPY时,可保证在两次主保护动作时,TA铁芯不饱和且准确传变一次电流。
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