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【单选题】
一台同步发电机额定电压为10.5kV,额定电流为1718A,进行空载试验励磁电流为20A时发电机的空载电势为1200V(线值),进行短路试验励磁电流为100A时短路电流为500A,则直轴同步电抗不饱和值为( )欧姆。
A.
2.4
B.
12
C.
6.93
D.
1.39
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