题目内容

发电机功角δ为( )时,发电机向系统发出无功功率。

A. δ<90°
B. δ=90°
C. δ>90°
D. δ>120°

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如果正常运行时向系统输出无功为Q1,失步运行后由系统吸收无功为Q2,则系统出现(Q1+ Q2)的无功缺额。( )

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