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Protection and Control
Five zone phase-to-phase distance protection (21P)
One zone phase-to-phase distance protection for pilot scheme (85)
Five zone phase-to-ground distance protection (21G)
One zone phase-to-ground distance protection for pilot scheme (85)
High-speed DPFC distance protection (21D)
Pilot directional earth-fault protection (85)
Four stage phase overcurrent protection (50/51P)
Four stage neutral overcurrent protection (50/51G)
Three stages negative-sequence overcurrent protection (50/51Q)
Breaker failure protection for one or two breakers (50BF)
Stub overcurrent protection (87STB)
Three stage undervoltage protection and three stage overvoltage protection (27/59)
Four stage underfrequency protection and four stage overfrequency protection (81)
One stage negative-sequence overvoltage protection (59Q)
Phase overcurrent protection during VT failure (50P VT)
Neutral overcurrent protection during VT failure (50G VT)
Switch-onto-fault (SOTF) logic
Unique power swing blocking releasing logic (PSBR)
Out-of-step protection (78)
Broken conductor protection (46BC)
Dead zone protection (50DZ)
Thermal overload protection (49)
Pole discrepancy protection (62PD)
Reverse power protection (32R)
Single and/or three-pole auto-reclosing (single-breaker or dual-breaker ). (79)
Remote/local control
Synchronism check (25)
Voltage and current drift auto adjustment.
Frequency tracking.
