ABB REL 551-C1*2.5 Technical Reference Manual page 5

Application .................................................................................... 38
Logic diagram ............................................................................... 38
Function block............................................................................... 39
Input and output signals................................................................ 39
Self supervision with internal event recorder (INT) ............................ 40
Application .................................................................................... 40
Function block............................................................................... 40
Logic diagram ............................................................................... 41
Input and output signals................................................................ 42
Technical data .............................................................................. 43
Configurable logic blocks (CL1) ......................................................... 44
Application .................................................................................... 44
Inverter function block (INV) ......................................................... 44
OR function block (OR)................................................................. 44
AND function block (AND) ............................................................ 45
Timer function block (TM) ............................................................. 46
Setting parameters .................................................................. 46
Timer long function block (TL) ...................................................... 46
Setting parameters .................................................................. 47
Pulse timer function block (TP)..................................................... 47
Setting parameters .................................................................. 48
Extended length pulse function block (TQ)................................... 48
Setting parameters ................................................................. 48
Exclusive OR function block (XO)................................................. 49
Set-reset function block (SR)........................................................ 49
Set-reset with memory function block (SM) .................................. 50
Controllable gate function block (GT) ........................................... 50
Setting parameters .................................................................. 51
Settable timer function block (TS)................................................. 51
Setting parameters .................................................................. 52
Technical data .............................................................................. 52
Blocking of signals during test (BST) ................................................. 53
Application .................................................................................... 53
Function block............................................................................... 53
Input and output signals................................................................ 53
Chapter 4 Line differential protection ........................................... 55
Line differential protection, phase segregated (DIFL)........................ 56
Application .................................................................................... 56
Functionality.................................................................................. 56
Function block............................................................................... 58
Logic diagram ............................................................................... 59
Input and output signals................................................................ 59
Setting parameters ....................................................................... 60
Technical data .............................................................................. 61
Chapter 5 Current ........................................................................... 63
Instantaneous non-directional overcurrent protection (IOC) .............. 64
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