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Monitoring the Command Execution
The following is monitored:
• Interruption of a command because of a Cancel Command
• Runtime Monitor (feedback message monitoring time)
2.15.4
Switchgear Interlocking
System interlocking is executed by the user-defined logic (CFC).
2.15.4.1 Description
Interlocking checks in a SICAM / SIPROTEC 4 system are normally divided in the following groups:
• System interlocking relies on the system data base in the substation or central control system.
• Bay interlocking relies on the object data base (feedbacks) of the bay unit.
• cross-bay interlocking via GOOSE messages directly between bay units and protection relays (with
IEC61850: The inter-relay communication with GOOSE is performed via the EN100 module)
The extent of the interlocking checks is determined by the configuration of the relay. To obtain more information
about GOOSE, please refer to the SIPROTEC 4 System Description /1/.
Switching objects that require system interlocking in a central control system are assigned to a specific param-
eter inside the bay unit (via configuration matrix).
For all commands, operation with interlocking (normal mode) or without interlocking (Interlocking OFF) can be
selected:
• For local commands, by activation of "Normal/Test"-key switch,
• For automatic commands, via command processing. by CFC and deactivated interlocking recognition,
• For local / remote commands, using an additional interlocking disable command, via Profibus.
Interlocked / Non-Interlocked Switching
The configurable command checks in the SIPROTEC 4 devices are also called "standard interlocking". These
checks can be activated via DIGSI (interlocked switching/tagging) or deactivated (non-interlocked).
Deactivated interlock switching means the configured interlocking conditions are not checked in the relay.
Interlocked switching means that all configured interlocking conditions are checked within the command pro-
cessing. If a condition is not fulfilled, the command will be rejected by a message with a minus added to it (e.g.
"„CO–""), immediately followed by a message.
The following table shows the possible types of commands in a switching device and their corresponding indi-
cations. The indications designated with *) are displayed in the shown form in the Web Monitor in the event
logs, for DIGSI they appear in the spontaneous indications.
Control issued
Manual tagging (positive / negative)
Information state command, input blocking
Information state command, output blocking
Cancel command
SIPROTEC, 7SC80, Manual
E50417-G1140-C486-A1, Release date 12.2011
Type of Command
Command
Cause
Switching
CO
Manual tagging
MT
Input blocking
ST
Output blocking
ST
Cancel
CA
Functions
2.15 Command Processing
Message
CO+/–
MT+/–
ST+/– *)
ST+/– *)
CA+/–
177
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