From: Transmission line protection challenges influenced by inverter-based resources: a review
Angle between Ia2 and Ia0 | Fault type permission |
---|---|
Ia2 is ± 30° of Ia0 | Permit AG or BC |
Ia2 lags Ia0 by 90° − 150° | Permit BG or CA |
Ia2 leads Ia0 by 90° − 150° | Permit CG or AB |
Ia2 leads or lags Ia0 by 30° − 60° | Select the ptp mho element with the lowest calculated reach. Compare |Rag| with the |Rf| of that element |
Ia2 lags Ia0 by 60° − 90° or 150° − 180° | Select the ptp mho element with the lowest calculated reach. Compare |Rbg| with the |Rf| of that element |
Ia2 leads Ia0 by 60° − 90° or 150° − 180° | Select the ptp mho element with the lowest calculated reach. Compare |Rcg| with the |Rf| of that element |