2 Functions
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7SA522 Manual
C53000-G1176-C155-3
– Command in progress (only one command can be processed at a time for each
circuit breaker or switch);
– 1–of–n check (for multiple allocations such as common contact relays it is
checked if a command procedure was already initiated for the output relays con-
cerned).
Command Execu-
t i o n M o n i t o r i n g
The following is monitored:
• Interruption of a command because of a cancel command,
• Running Time Monitor (feedback message monitoring time)
2.22.1.3 Switchgear Interlocking
Interlocking can be executed by the user-defined logic (CFC). System interlocking
checks in a SICAM
®
/SIPROTEC
®
system are usually categorized as follows:
• System interlocking checked by a central control system (for interbay interlocking),
• Zone controlled/bay interlocking checked in the bay device (for the feeder).
Zone Controlled/Bay Interlocking Zone controlled/bay interlocking relies on the object
data base (feedbacks) of the bay unit (here the SIPROTEC
®
4 relay) as was deter-
mined during configuration (see SIPROTEC
®
4 System Description).
The extent of the interlocking checks is determined by the configuration and interlock-
ing logic of the relay.
Switching objects that require system interlocking in a central control system are as-
signed to a specific parameter inside the bay unit (via configuration matrix).
For all commands, operation with interlocking (normal mode) or without interlocking
(test mode) can be selected:
• for local commands by reprogramming the settings with password check,
• for automatic commands, via command processing by CFC and Deactivated Inter-
locking Recognition,
• for local / remote commands, using an additional interlocking disable command, via
Profibus.
Interlocked/
de-interlocked
Switching
The configurable command checks in the SIPROTEC
®
4 devices are also called “stan-
dard interlocking”. These checks can be activated via DIGSI
®
(interlocked switching /
tagging) or deactivated (non-interlocked).
De-interlocked or non-interlocked switching means that the configured interlock con-
ditions are not tested.
Interlocked switching means that all configured interlocking conditions are checked
within the command processing. If a condition could not be fulfilled, the command will
be rejected by a message with a minus added to it (e.g. “CO–”), followed by an oper-
ation response information. The rejection takes also place if a synchronism check is
carried out before closing and the conditions for synchronism are not fulfilled. Table 2-
17 shows the types of possible commands to switchgear, and the associated annun-
ciations. Indications designated with *) are displayed in the represented form in the
device display in the event logs and in DIGSI
®
on the other hand, they appear in spon-
taneous indications.
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