Siemens SIPROTEC 6MD665, Manual

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2.2 Command processing
21
6MD665 Manual
C53000-G1876-C103-3
– Operating equipment enabled as output (if an operating equipment component
was configured, but not configured to a binary input, the command is denied)
– 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
denied)
– Module hardware error
– Command in Progress (only one command can be processed at a time for one
piece of equipment, object-related Double Operation Block)
– 1–of–n check (for multiple allocations such as common contact relays it is
checked if a command procedure was already ininitiated for the output relays
concerned).
Command execution monitoring
The following is monitored:
• Interruption of a command because of a Cancel Command
• Running Time Monitor (feedback message monitoring time)
Switchgear interlocking
Switchgear interlocking checks in a SICAM
®
/SIPROTEC
®
system are divided in the
following groups:
1. System interlocking relies on the system database in the central control system,
2. Zone controls, relies on the object image (feedbacks) in the field device and infor-
mation of the neighbouring fields via IRC.
The extent of the interlocking checks is determined by configuration.
Switching objects that require system interlocking in a central control system are
assigned to a specific parameter inside the bay unit (via configuration matrix).
In the level below the SICAM HV components there is no further interlocking available,
therefore the switching fault protection is distributed between the SICAM central
device and SIPROTEC
®
4 bay processing unit.
For all commands, operation with interlocking (normal mode) or without interlocking
(test mode) can be selected:
• for Local commands, by activation of "Normal/Test"-key switch,
• 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 is not fulfilled, the command is rejected,
marked with a minus sign (e.g. "CO–"), and an indication to that effect is output.