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在計算單臺發電機饋電的短路電流時，由于用等效電壓源cUn/ 代替同步發 電機的超瞬態電勢E〃，因此發電機的阻抗應用校正阻抗 。
電阻RG和超瞬態電抗X〃d的關系式可根據發電機額定電壓和視在功率按以下 范圍選用：
對UrG＞1kV，SrG≥100MVA的發電機：RG=0.05X″d
對UrG＞1kV，SrG＜100MVA的發電機：RG=0.07X″d
對UrG≤1000V的發動機：RG=0.15 X″d
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