Protective Functions

• Sync-check with Phase Angle, ∆V and ∆F with dead line/dead bus

options (25)

• Phase undervoltage (27) protection

• Ground undervoltage (27G) protection

• Dual-setpoint, single or three phase, directional power detection that

can be selected as over/ under power protection (32)

• Dual-zone, offset-mho loss-of-field for generator protection (40)

• Sensitive negative sequence overcurrent protection and alarm (46)

• Negative sequence overvoltage (47)

• Inverse time residual overcurrent (51N)

• Phase overcurrent with voltage restraint/control (51V) protection

• Phase overvoltage (59) protection

• Ground overvoltage (59G) protection

• Peak overvoltage (59I) protection

• VT fuse-loss detection and blocking (60FL)

• Reconnect enable for intertie protection (79)

• Four-step over/under frequency (81) protection