Section 7 Current protection...........................................................91
Directional phase overcurrent protection, four steps OC4PTOC......91
Identification................................................................................ 91
Application...................................................................................91
Setting guidelines........................................................................ 92
Settings for each step.............................................................94
Setting example......................................................................97
Directional residual overcurrent protection, four steps EF4PTOC .102
Identification.............................................................................. 102
Application.................................................................................102
Setting guidelines...................................................................... 104
Common settings for all steps.............................................. 105
2nd harmonic restrain...........................................................106
Parallel transformer inrush current logic...............................106
Switch onto fault logic...........................................................107
Settings for each step (x = 1, 2, 3 and 4)............................. 108
Four step directional negative phase sequence overcurrent
protection NS4PTOC .....................................................................111
Identification.............................................................................. 111
Application.................................................................................111
Setting guidelines...................................................................... 113
Settings for each step ..........................................................113
Common settings for all steps.............................................. 116
Thermal overload protection, two time constants TRPTTR ...........117
Identification.............................................................................. 118
Application.................................................................................118
Setting guideline........................................................................119
Setting example....................................................................121
Breaker failure protection CCRBRF............................................... 123
Identification.............................................................................. 123
Application.................................................................................124
Setting guidelines...................................................................... 124
Pole discordance protection CCPDSC........................................... 127
Identification.............................................................................. 128
Application.................................................................................128
Setting guidelines...................................................................... 128
Section 8 Voltage protection........................................................ 131
Two step undervoltage protection UV2PTUV ................................131
Identification.............................................................................. 131
Application.................................................................................131
Setting guidelines...................................................................... 132
Equipment protection, such as for motors and generators...132
Table of contents
Busbar protection REB650 2.2 IEC 3
Application manual