104年 - 104 國立中山大學_碩士班招生考試_電機系(丁組)：電力工程#110208

(a) Calculate the Z matrix after the line between Bus 2 and Bus 4 is removed； (15%)

(b) Assuming the bus voltages before fault are all 1.0p.u. Calculate the short circuit current when a three-phase short-circuit fault occurred at Bus 3 for (a) and bus voltages after this fault. (10%)

(a) the zero-, positive- and negative-sequence line-to-neutral voltages ； (5%)

(b) the zero-, positive- and negative-sequence line-to-line voltages； (5%)

(c) the zero-, positive- and negative-sequence line currents. (5%) (All answers should be in p.u.)

3.Calculate the line flows and power flows from Bus i to Bus j and Bus j to Bus i for Fig. 2 and the line loss for this line (all values in Fig. 2 are in p.u.). (20%)

(a) Determine the swing equation and the initial operating power angle. (10%)

(b) Calculate the critical clearing time for the generator when a three-phase bolted short-circuit at the generator terminals causes P_e =0. (15%)

(a) unity power factor,

(b) lagging power factor and

(c) leading power factor. (15%)

104年 - 104 國立中山大學_碩士班招生考試_電機系(丁組)：電力工程#110208

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