Siemens SIPROTEC 7ST6, Руководство пользователя, Страница: 195 / 356

2.20 Command Processing
195
7ST6 Manual
E50417-G1176-C251-A3
2.20.1.2 Sequence in the Command Path
Security mechanisms in the command path ensure that a switch command can be
carried out only if the test of previously established criteria has been successfully com-
pleted. Additionally, user-defined interlocking conditions can be configured separately
for each device. The actual execution of the command is also monitored after its re-
lease. The entire sequence of a command is described briefly in the following.
Checking a
Command Path 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 deac-
tivated 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 con-
tact);
– Configuration in process (if setting modification is in process, commands are re-
jected 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 reject-
ed);
– 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 initiated for the output relays concerned or if a protection
command is present. Superimposed commands in the same switching direction
are tolerated).
Command Execu-
tion Monitoring The following is monitored:
• Interruption of a command because of a cancel command,
• Running time monitor (feedback monitoring time).
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