ABB REL 551-C1*2.5 - Page 6

Contents
Application.................................................................................... 64
Functionality ................................................................................. 64
Function block .............................................................................. 64
Logic diagram............................................................................... 66
Input and output signals ............................................................... 66
Setting parameters ....................................................................... 67
Technical data .............................................................................. 67
Definite time non-directional overcurrent protection (TOC) ............... 68
Application.................................................................................... 68
Functionality ................................................................................. 68
Function block .............................................................................. 69
Logic diagram............................................................................... 70
Input and output signals ............................................................... 70
Setting parameters ....................................................................... 71
Technical data .............................................................................. 71
Time delayed residual overcurrent protection (TEF) ........................ 72
Application.................................................................................... 72
Functionality ................................................................................. 72
Function block .............................................................................. 72
Logic diagram............................................................................... 73
Input and output signals ............................................................... 73
Setting parameters ....................................................................... 74
Technical data .............................................................................. 75
Thermal phase overload protection (THOL) ...................................... 76
Application.................................................................................... 76
Functionality ................................................................................. 76
Function block .............................................................................. 76
Logic diagram............................................................................... 77
Input and output signals ............................................................... 77
Setting parameters ....................................................................... 77
Technical data .............................................................................. 79
Chapter 6 Secondary system supervision ................................... 81
Current circuit supervision, current based (CTSU)............................ 82
Application.................................................................................... 82
Functionality ................................................................................. 82
Function block .............................................................................. 82
Logic diagram............................................................................... 83
Input and output signals ............................................................... 83
Setting parameters ....................................................................... 83
Technical data .............................................................................. 84
Chapter 7 Logic............................................................................... 85
Tripping logic (TR) ............................................................................. 86
Application.................................................................................... 86
Functionality ................................................................................. 86
Input and output signals ............................................................... 86
Setting parameters ....................................................................... 86