Interlocking; Interlocked/Non-Interlocked Switching - Siemens siprotec 7SA6 User Manual

Monitoring the
Command
Execution

6.22.3 Interlocking

6.22.3.1 Interlocked/Non-Interlocked Switching

7SA6 Manual
C53000-G1176-C133-1
− Interruption of a command because of a cancel command
− Running time monitor (feedback message monitoring time)
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
interlocking 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,
The command checks that can be selected for the SIPROTEC
referred to as "standard interlocking". These checks can be activated (interlocked) or
deactivated (non interlocked) via DIGSI
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
operation response information. Table 6-16 shows some types of commands and
messages. For the device the messages designated with
®
logs, for DIGSI 4 they appear in spontaneous messages.
types of command and messages
Table 6-16
Type of command
Control issued
Manual tagging (positive / negative)
Input blocking
Output blocking
Control abortion
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
®
®
4.
-
"), immediately followed by an
are displayed in the event
*)
Abbrev. Message
CO CO+/–
MT MT+/–
IB IB+/– *)
OB OB+/– *)
CA CA+/–
Functions
-relays are also
6-297