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If Iaβ is the positive sequence current of an alternator and Zβ, Zβ and Zβ are the sequence impedances of the alternator. The drop produced by the current Iaβ will be
IaβZβ
Iaβ (Zβ + Zβ)
Iaβ(Zβ + Zβ + Zβ)
Iaβ(Zβ + Zβ)