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三机三机电力系统如题图(1)所示,已知各元件参数标值如下,发电G-1:x' d =0.1,x 2 =0.1,T J =10S;发电机G-2:x' d =0.15,x' d =0.15,T J =7S;发电机G-3:x' d =0.06,x 2 =0.06,T J =15S。变压器电抗:x T1 =0.08,x T2 =0.1,x T3 =0.04,x T4 =0.05。线路电抗:AB段x L1 =0.2,x L0 =3.5x L1 ;BC段x L1 =0.1,x L0 =3.5x L1 。系统的初始运行状态:V D0 =1.0,S LD0 =5.5+j1.25,S 20 =1.0+j0.5,S 30 =3+j0.8。在线路AB段首端f点发生两相短路接地,经0.1S切除故障线路,试判断系统的暂态稳定性。 提示:为简化计算,负荷用恒定阻抗表示,可用网络变换法求各发电机的输入阻抗和转移阻抗,用分段计算法计算各发电机的转子摇摆曲线。