Siemens Siprotec 7VK61 Manual page 158

Functions
2.8 Function Control
Figure 2-62 Storage and termination of the trip command
Reclosure Interlocking
When tripping the circuit breaker by a protection function the manual reclosure must often be blocked until the
cause for the protection function operation is found. 7VK61 enables this via the integrated reclosure interlock-
ing.
The interlocking state („LOCKOUT") will be realized by an RS flipflop which is protected against auxiliary
voltage failure (see Figure 2-63). The RS flipflop is set via binary input „>Lockout SET" (no. 385). With the
output alarm „LOCKOUT" (no. 530), if interconnected correspondingly, a reclosure of the circuit breaker (e.g.
for automatic reclosure, manual close signal, synchronization, closing via control) can be blocked. Only once
the cause for the protection operation is known, should the interlocking be reset by a manual reset via binary
input „>Lockout RESET" (no. 386).
Figure 2-63
Conditions which cause reclosure interlocking and control commands which have to be interlocked can be set
individually. The two inputs and the output can be wired via the correspondingly allocated binary inputs and
outputs or be linked via user-defined logic functions (CFC).
If, for example, each trip by the protection function has to cause a closing lockout, then combine the trip
command „Relay TRIP" (no. 511) with the interlocking input „>Lockout SET". If automatic reclosure is
158
Reclosure Interlocking
SIPROTEC, 7VK61, Manual
C53000-G1176-C159-3, Release date 05.2009