四、如圖二所示之系統，發電機的暫態電抗、變壓器及輸電線的電抗標么值如圖上之標示，假設發電機反電勢 Eg'與無限匯流排電壓 V 之間的功率角為 δ。若 P 點發生三相短路故障，試求故障前、故障

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四、如圖二所示之系統，發電機的暫態電抗、變壓器及輸電線的電抗標么值如圖上之標示，假設發電機反電勢 Eg'與無限匯流排電壓 V 之間的功率角為 δ。若 P 點發生三相短路故障，試求故障前、故障中與故障排除後（發生故障之輸電線切離系統）的發電機功率-角輸出方程式（power-angle equation）。（25 分）

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