Siemens siprotec 7SA522 User Manual

2 Functions
244
7SA522 Manual
C53000-G1176-C155-3
Figure 2-107 Connection example with external protection device for fault detection depen-
dent dead time — dead time control by pickup signals of the protection device;
AR control mode = with PICKUP
2 Protection Relays
with 2 Automatic
Reclosure Circuits
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 2-108 shows the necessary cross-
connections.
If phase segregated 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 activation of the forced three pole trip (see Section 2.13.2 at subtitle
“Forced Three-Pole Trip”). An external automatic three-pole coupling is therefore not
necessary when the above conditions are satisfied. This rules out two-pole tripping
under all circumstances.

Siemens siprotec 7SA522 Specifications

General

Brand	Siemens
Model	siprotec 7SA522
Category	Protection Device
Language	English