A communication signal is sent (CS) if a fault is detected by zone 1 (underreach zone).
When a communication signal is received (CR) zone 2 operates instantaneously. The logic
is shown in figure 15.
AND
Trip
ANSI11000074_2_en.vsd
ZQMPDIS (21)
Send signal (CS)
Receive signal (CR)
Zone 1 TRIP
Zone 1 PICKUP
Zone 2 TRIP
Zone 2 PICKUP
OR
ANSI11000074 V2 EN
Figure 15: Logic of under-reach communication scheme
This scheme is used for long lines where it can be assured that the zone 1 reach from both
line ends overlap each other.
3.1.6.3 Principle for blocking scheme
The principle of the logic can be explained as shown in figure 16.
Section 3 1MRK 506 334-UUS A
REL650 setting examples
60
Application manual
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