ABB REL650 Applications Manual page 69

1MRK 506 334-UUS A
Application manual
Delta based fault
inception detection and
forward fault inhibit
A
REL 650
Y
ANSI11000250 V1 EN
Figure 18: Principle of delta blocking communication scheme
When a communication signal is received (CR) the overeaching zone (zone2) is blocked.
The logic is shown in figure 19.
ZQMPDIS (21)
Zone 1 TRIP
Zone 1 PICKUP
Zone 2 TRIP
Zone 2 PICKUP
Receive signal (CR)
ZCPSCH (85)
Delta based fault
inception detection
CS
ANSI11000251 V1 EN
Figure 19: Logic of delta blocking communication scheme
Zone 2
Zone 1
Z 1 = R 1 + jX 1
Z 0 = R 0 + jX0
Communication
Zone 1
Zone 2
AND
AND
Section 3
REL650 setting examples
B
REL 650
C
Y
Delta based fault
inception detection and
forward fault inhibit
ANSI11000250-1-en.vsd
OR
Send signal (CS)
ANSI11000251-1-en.vsd
Trip
63