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【单选题】
谐波制动的变压器保护中设置差动电流速断保护元件的主要原因是（）
A.
为了提高差动保护的动作速度；
B.
保护设置的双重化；
C.
为了防止较高的短路水平时，由于电流互感器的饱和产生谐波，导致差动元件拒动；
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