ABB REL 551-C1*2.5 - Logic Diagram; Input and Output Signals

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Line differential protection, phase segregated
(DIFL)
Chapter 4
Line differential protection
1.4 Logic diagram
Figure 18: Simplified block diagram, line differential protection function
1.5 Input and output signals
Table 69: Input signals for the DIFL (DIFL-) function block
1 Communication interface
2 Communication logic
3 Remote trip
4 Remote current value
5 Remote saturation detection
6 Remote block
7 Fourier filter
8 Saturation detector
7
8
1≥
DIFL-BLOCK
1≥
DIFL-RTCSEND1
DIFL-RTCSEND2
Idiff
Ibias
5
6
DIFL-CTSAT
DIFL-BLOCK
4
DIFL-RTCREC1
DIFL-RTCREC2
DIFL-TRIP
2
DATA TRANSMIT
DATA RECEIVE
1
1≥
3
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I
Signal Description
BLOCK Block of line differential function
CTSUP Block from current circuit supervision function