ABB REL650 - Principle for Delta Blocking Scheme

Receive signal
(
CR
)
Trip
Send signal (CS)
Zone 1 TRIP
Zone 1 PICKUP
Zone 2 TRIP
Zone 2
PICKUP
Zone 4
TRIP
Zone 4
PICKUP
Reverse:
ANSI11000077_2_en.vsd
ZQMPDIS (21)
OR
AND
ANSI11000077 V2 EN
Figure 17: Logic of blocking communication scheme
The trip signal from zone 2 must be delayed so that the blocking signal has enough time
for blocking at external faults.
3.1.6.4 Principle for delta blocking scheme
The principle of the logic can be explained as shown in figure
18.
Section 3 1MRK 506 334-UUS A
REL650 setting examples
62
Application manual