How do you calculate positive negative and zero sequence impedance? - Answers

Positive, negative, and zero sequence impedances are calculated using the sequence components of the system's phase currents and voltages. For a three-phase system, you can express the phase currents and voltages in terms of their sequence components using the transformation matrix. The positive sequence impedance is derived from the phase impedances during balanced conditions, while negative and zero sequence impedances are calculated using the same method under unbalanced conditions, typically by analyzing the system's response to faults or imbalances. These impedances are essential for studying fault conditions and system stability in power systems.