单选题:变压器的零序电抗与其构造和绕组连接方式有关。对于YN,d接线、三相四柱式双绕组变压器,其零序电抗为:(  )

题目内容:
变压器的零序电抗与其构造和绕组连接方式有关。对于YN,d接线、三相四柱式双绕组变压器,其零序电抗为:(  ) A.XD=∞
B.XD=X1+X1+X″o
C.XD=X1
D.XD =X1+3Z

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