Siemens SIPROTEC 7SA6 Manual page 160

Distance protection relay for all voltage levels
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Configuration
5-32
Figure 5-29
Dialogue box: object properties for a command with feedback
The conditional checks that should be conducted before execution of a switching com-
mand can also be defined:
• Substation interlocking: interlocking of substations is carried out (configuration via
a substation)
• Zone controlled (Bay Specific Interlocking): Logic functions in the device created
with CFC are processed for interlocked switching.
• Switching direction check (scheduled/actual): The switching command is negated
and a corresponding indication is issued if the circuit-breaker is already in the
scheduled position. As soon as this check is activated, the switching direction check
will not only be enabled for interlocked, but also for non-interlocked switching.
• Blocked by protection: CLOSE commands to the switchgear are blocked as soon
as one of the protective functions in the device picks up a fault. TRIP commands,
in contrast, can always be executed.
7SA6 Manual
C53000-G1176-C156-2

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