conditions can be configured separately for each device. The actual execution of the command is also moni-
tored after its release. The entire sequence of a command is described briefly in the following list:
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)
2.10.1.3
Functions
2.10 Command Processing
170
SIPROTEC 4, 7VK61, Manual
C53000-G1176-C159-5, Edition 05.2018
Summary of Contents for SIPROTEC 4 7VK61
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