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Operation using
®
DIGSI
4
Operation using the
SCADA Interface
2.46.1 Types of Commands
Control Commands
Internal / Pseudo
Commands
2.46.2 Steps in the Command Sequence
7UM62 Manual
C53000-G1176-C149-3
Control commands for switchgear can also be entered in DIGSI
connected to the operator interface. The procedure to do so is described in the
®
SIPROTEC
4 System Manual (Control of Switchgear).
Control commands for switchgear can also be entered through the serial SCADA
interface communicating with the substation control and protection system. A
prerequisite for this is that the required peripherals physically exist in the device and
the substation. Also, a few settings for the serial interface in the device are required
®
(see SIPROTEC
4 System Manual).
Two types of commands can be processed within the device:
These are all commands that are directly output to the switchgear to change their
process state:
− Commands for the operation of circuit breakers (unsynchronized),
disconnectors, earthing switches
− Step commands (e.g. raising and lowering transformer LTCs)
− Set-point commands with configurable time settings (Petersen coils)
These commands do not directly operate binary outputs. They serve to initiate internal
functions, simulate changes of state, or to acknowledge changes of state.
− Manual overwriting commands to manually update information on process-
dependent objects such as annunciations and switching states, e.g. if the
communication with the process is interrupted. Manually overwritten objects are
marked as such in the information status and can be displayed accordingly.
− Additionally, Tagging commands are issued to establish internal settings, such
as switching authority (remote vs. local), parameter set changeover, data
transmission block to the SCADA interface, and measured value set-points.
− Acknowledgment and resetting commands for setting and resetting internal
buffers.
− Information status command to set/reset the additional „Information status" item
of a process object, such as:
− Controlling activation of binary input status
− Binary Output Blocking
Safety mechanisms in the command sequence ensure that a command can only be
released after a thorough check of preset criteria has been successfully concluded.
Additionally, user-defined interlocking conditions can be programmed separately for
each command. The actual execution of the command is also monitored afterwards.
The entire sequence of a command is described briefly in the following:
Breaker Control
®
4 with a PC that is
299
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