Functions
6-166 7SA522 Manual
C53000-G1176-C119-2
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 =
ZLWK3,&.83
2 protection
devices with 2
automatic
reclosure
functions
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.
7SA522
Pick-up L1
Pick-up L2
Pick-up L3
Tripping
L+
external
protection device
L–
Starting signal for each phase
7SA522
Pick-up 1-phase
Pick-up 2-phase
Pick-up 3-phase
Tripping
L+
external
protection device
L–
Starting signal 1-phase, 2-phase and 3-phase
Release AR Stage
L– L+
(if nec. for other AR)
Release AR Stage
L– L+
(if nec. for other AR)
!3LFNXS/$5
!3LFNXS/$5
!3LFNXS/$5
!7ULSIRU$5
AR 1.CycZoneRel
!3LFNXSSK$5
!3LFNXSSK$5
!3LFNXSSK$5
!7ULSIRU$5
$5&\F=RQH5HO
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