Functions
2.16 Function Control and Circuit Breaker Test
SIPROTEC, 7SD610, Manual
C53000-G1176-C145-6, Release date 02.2011
233
ed when the circuit breaker pole is open, is set. Address 1135 Reset Trip CMD determines under which
conditions a trip command is reset. If CurrentOpenPole is set, the trip command is reset as soon as the
current disappears. It is important that the value set in address 1130 PoleOpenCurrent (see above) is un-
dershot. If Current AND CB is set, the circuit breaker auxiliary contact must send a message that the circuit
breaker is open. It is a prerequisite for this setting that the position of the auxiliary contact is allocated via a
binary input. If this additional condition is not required for resetting the trip command (e.g. if test sockets are
used for protection testing), it can be switched off with the setting Pickup Reset.
Figure 2-105 Storage and termination of the trip command
Reclosure Interlocking
When a protection function has tripped the circuit breaker, it is often desired to prevent reclosing until the trip-
ping cause has been found. 7SD610 enables this via the integrated reclosure interlocking.
The interlocking state („LOCKOUT“) will be realized by an RS flipflop which is protected against auxiliary
voltage failure (see Figure 2-106). 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 2-106 Reclosure Interlocking
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