Checking a Command Execution
Please observe the following:
•
Command entry, e.g. using the keypad on the local user interface of the device
– Check password → access rights;
– Check switching mode (interlocking activated/deactivated) → selection of deactivated interlocking
status.
•
User configurable interlocking checks:
– Switching authority;
– Device position check (set vs. actual comparison);
– Zone controlled / bay interlocking (logic using CFC);
– System interlocking (centrally via SICAM);
– Double operation (interlocking against parallel switching operation);
– Protection blocking (blocking of switching operations by protection functions);
– Checking the synchronism before a close command.
•
Fixed commands:
– Internal process time (software watch dog which checks the time for processing the control action
between initiation of the control and final close of the relay contact);
– Configuration in process (if setting modification is in process, commands are rejected or delayed);
– Equipment present as output;
– Output block (if an output block has been programmed for the circuit breaker, and is active at the
moment the command is processed, then the command is rejected);
– Component hardware malfunction;
– 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 or multiple protection
commands configured to the same contact it is checked if a command procedure was already initi-
ated for the output relays concerned or if a protection command is present. Superimposed
commands in the same switching direction are tolerated).
Command Execution Monitoring
The following is monitored:
•
Interruption of a command because of a cancel command,
•
Running time monitor (feedback monitoring time).
Interlocking
Interlocking can be executed by the user-defined logic (CFC). Switchgear interlocking checks in a SICAM/
SIPROTEC 4 system are normally divided in the following groups:
•
System interlocking checked by a central control system (for interbay interlocking),
•
Zone controlled/bay interlocking checked in the bay device (for the feeder).
•
Cross-bay interlocking via GOOSE messages directly between bay controllers and protection relays (with
rollout of IEC 61850; inter-relay communication by GOOSE messaging is performed via the EN100
module)
System interlocking is based on the process image in the central device. Zone controlled/bay interlocking relies
on the object database (feedback information) of the bay unit (here the SIPROTEC 4 relay) as was determined
during configuration (see SIPROTEC 4 System Description).
2.24.1.3
Functions
2.24 Command Processing
304 SIPROTEC 4, 7UT6x, Manual
C53000-G1176-C230-5, Edition 09.2016
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