Siemens siprotec 7SA522, User Manual

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Functions
6-255
7SA522 Manual
C53000-G1176-C119-2
Monitoring the
Command Execu-
tion
−
Interruption of a command because of a cancel command
−
Running time monitor (feedback message monitoring time)
6.19.3 Interlocking
Interlocking is executed by the user-defined logic (CFC). The interlocking checks of a
SICAM/SIPROTEC
®
-system are classified into:
•
System interlocking checked by a central control system (for a busbar)
•
Zone controlled/bay interlocking checked in the bay device (for the feeder)
System interlocking relies on the system data base in the central control system. Zone
controlled/bay interlocking relies on the status of the circuit breaker and other switches
that are connected to the relay.
The extent of the interlocking checks is determined by the configuration and interlock-
ing logic of the relay.
Switchgear which is subject to system interlocking in the central control system is
marked with a parameter (in the routing matrix)
For all commands the user can select the operation mode with interlocking (normal
mode) or without interlocking (test mode):
−
for local commands by reprogramming the settings with password check,
−
for automatic commands via command processing with CFC,
6.19.3.1 Interlocked/Non-Interlocked Switching
The command checks that can be selected for the SIPROTEC
®
-relays are also re-
ferred to as “standard interlocking”. These checks can be activated (interlocked) or de-
activated (non interlocked) via DIGSI
®
4.
Deactivated interlock switching means the configured interlocking conditions are not
checked in the relay.
Interlocked switching means that all configured interlocking conditions are checked in
the command check. If a condition could not be fulfilled, the command will be rejected
by a message with a minus added to it (e.g. “CO
-
”), immediately followed by an oper-
ation response information. Table 6-11 shows some types of commands and messag-
es. For the device the messages designated with
*)
are displayed in the event logs, for
DIGSI
®
4 they appear in spontaneous messages.
The “plus” appearing in the message is a confirmation of the command execution: the
command execution was as expected, in other words positive. The “minus” is a neg-
Table 6-11
types of command and messages
Type of command Abbrev. Message
Control issued CO CO+/–
Manual tagging (positive / negative) MT MT+/–
Input blocking IB IB+/– *)
Output blocking OB OB+/– *)
Control abortion CA CA+/–