Basler BE1-11g Instruction Manual page 6

iv
Frequency (81) Protection ........................................................................................................................ 89
Frequency Measurement......................................................................................................................... 89
Underfrequency and Overfrequency Protection ...................................................................................... 89
Frequency Rate-of-Change Protection .................................................................................................... 90
Logic Connections ................................................................................................................................... 92
Operational Settings ................................................................................................................................ 92
Negative-Sequence Overcurrent (46) Protection ................................................................................... 95
Pickup Settings ........................................................................................................................................ 95
Coordination Settings .............................................................................................................................. 96
Instantaneous Overcurrent (50) Protection ............................................................................................ 97
Element Operation ................................................................................................................................... 97
Logic Connections ................................................................................................................................... 99
Operational Settings ................................................................................................................................ 99
Breaker Failure (50BF) Protection ......................................................................................................... 101
Element Operation ................................................................................................................................. 101
Logic Connections ................................................................................................................................. 103
Operational Settings .............................................................................................................................. 103
Inverse Overcurrent (51) Protection ...................................................................................................... 105
Element Operation ................................................................................................................................. 105
Logic Connections ................................................................................................................................. 110
Operational Settings .............................................................................................................................. 110
Directional Overcurrent (67) Protection ................................................................................................ 113
Polarization Methods ............................................................................................................................. 113
Maximum Torque Angle and Directional Tests ..................................................................................... 115
Theory of Using Sequence Impedances for Fault Direction .................................................................. 116
Phase Current Differential (87) Protection ........................................................................................... 119
Element Operation ................................................................................................................................. 119
Logic Connections ................................................................................................................................. 123
Settings .................................................................................................................................................. 123
Neutral Current Differential (87N) Protection ....................................................................................... 127
Element Operation ................................................................................................................................. 127
Logic Connections ................................................................................................................................. 129
Operational Settings .............................................................................................................................. 130
Phase Differential Protection: Self-Balancing and Split-Phase Configurations (50/51) .................. 131
Self-Balancing ....................................................................................................................................... 131
Split-Phase ............................................................................................................................................ 132
Power (32) Protection ............................................................................................................................. 133
Element Operation ................................................................................................................................. 133
Logic Connections ................................................................................................................................. 136
Operational Settings .............................................................................................................................. 136
Loss of Excitation - Reverse Var Based (40Q) Protection .................................................................. 139
Element Operation ................................................................................................................................. 139
Logic Connections ................................................................................................................................. 140
Operational Settings .............................................................................................................................. 141
Distance (21) Protection ......................................................................................................................... 143
Element Operation ................................................................................................................................. 143
Logic Connections ................................................................................................................................. 144
Operational Settings .............................................................................................................................. 144
Loss of Excitation - Impedance Based (40Z) Protection ..................................................................... 147
Element Operation ................................................................................................................................. 147
Logic Connections ................................................................................................................................. 148
Contents
9424200994 Rev U
BE1-11g