TA iron cores will produce a lot of remanence when fault current is cut, which will make TA reach saturation under the condition of little primary current.

• 电流互感器(TA)的铁心在故障电流开断时刻，将产生大量的剩磁，这将使TA在较小的一次输入电流情况下就达到饱和状态。