ABB REL 551-C1*2.5 - Function Block

58
Line differential protection, phase segregated
(DIFL)
Chapter 4
Line differential protection
1.3 Function block
Figure 16: DIFL function block for three phase tripping.
Figure 17: DIFL function block for single two and/or three phase tripping.
en03000099.vsd
RTCSEND1
DIFL-
DIFFERENTIAL
BLOCK
CTSUP
RTCSEND2
TRIP
RTCREC1
RTCREC2
CTSAT
COMOK
COMFAIL
RTCREC1
RTCSEND1
xx00000689.vsd
DIFL-
DIFFERENTIAL
BLOCK
CTSUP
RTCSEND2
TRIP
TRL1
TRL2
TRL3
RTCREC2
CTSAT
COMOK
COMFAIL