2 Functions
222
7UM61 Manual
C53000-G1176-C127-3
Operation using the
System Interface
Control of switching devices can be performed via the serial system interface and a
connection to the switchgear control system. For this the required peripherals physi-
cally must exist both in the device and in the power system. Within the device also spe-
cific settings have to be made for the serial interface (see SIPROTEC
®
4 System De-
scription).
2.36.2 Types of Commands
In conjunction with the power system control the following command types can be dis-
tinguished for the device:
2.36.2.1 Functional Description
Commands to the
System
These are all commands that are directly output to the switchgear to change their
process state:
• Switching commands for the control of circuit breakers (not synchronized), discon-
nectors and ground electrode,
• Step Commands, e.g. raising and lowering transformer LTCs
• Set-point commands with configurable time settings, e.g. to control Petersen coils
Internal / Pseudo
Commands
They do not directly operate binary outputs. They serve to initiate internal functions,
simulate changes of state or to acknowledge changes of state.
• Manual overriding commands to manually update information on process-depen-
dent objects such as indications and switching states, e.g. if the communication with
the process is interrupted. Manually overridden objects are flagged as such in the
information status and can be displayed accordingly.
• Tagging commands (for "Setting") for internal object information values, e.g. delet-
ing / presetting switching authority (remote vs. local), parameter set changeovers,
data transmission blockage and metered values.
• Acknowledgment and resetting commands for setting and resetting internal buffers
or data states.
• Information status command to set/reset the additional "information status" of a
process object, such as:
– Input blocking
– Output Blocking
2.36.3 Command Sequence
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. In addition to general fixed prescribed tests, for each resource separately
further interlocks can be configured. The actual execution of the command job also is
then monitored. The entire sequence of a command job is described briefly in the fol-
lowing:
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