Siemens siprotec 7SA522 User Manual page 314

Functions
2 protection
devices with 2
automatic
reclosure
functions
6-166
external
protection device
L+
L–
Starting signal for each phase
external
protection device
L+
L–
Starting signal 1-phase, 2-phase and 3-phase
Figure 6-90 Connection example with external protection device for fault detection dependent
dead time — dead time control by start signals of the protection device;
AR control mode =
If redundant protection is provided for a line and each protection operates with its own
automatic reclosure function, a certain signal exchange between the two combinations
is necessary. The connection example in figure 6-91 shows the necessary cross-con-
nections.
If phase segragated auxiliary contacts of the circuit-breaker are connected, a three-
pole coupling by the 7SA522 is guaranteed when more than one CB pole is tripped.
This requires setting of the forced three pole coupling (see section 6.11.2 under sub-
title "Forced three-pole coupling", page 170). An external automatic three-pole cou-
pling is therefore not necessary when the above conditions are satisfied. This rules out
two-pole tripping under all circumstances.
Pick-up L1
Pick-up L2
Pick-up L3
Tripping
Release AR Stage
(if nec. for other AR)
Pick-up 1-phase
Pick-up 2-phase
Pick-up 3-phase
Tripping
Release AR Stage
(if nec. for other AR)
ZLWK 3,&.83
7SA522
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3QvpxˆƒÃG!Ã6S
3QvpxˆƒÃG"Ã6S
3U…vƒÃs‚…Ã6S
AR 1.CycZoneRel
7SA522
3QvpxˆƒÃ ƒuÃ6S
3QvpxˆƒÃ!ƒuÃ6S
3QvpxˆƒÃ"ƒuÃ6S
3U…vƒÃs‚…Ã6S
6Sà 8’pa‚rSry
C53000-G1176-C119-2
L–
L+
L–
L+
7SA522 Manual