What are the factors that affect the magnitude of the zero-sequence current flowing through the protection?

(2) The magnitude of the zero-sequence current is related not only to the zero-sequence impedance, but also to the positive and negative sequence impedances.

(3) The magnitude of the zero-sequence current is closely related to the transformer that protects the neutral system and the neutral point of the opposite system.

(4) The magnitude of the zero sequence current is related to the proximity of the short circuit point.