Command Processing
The SIPROTEC 4 7UT6x includes a command processing function for initiating switching operations in the
system.
Control commands can originate from four command sources:
•
Local operation using the keypad on the local user interface of the device
•
Operation using DIGSI
•
Remote operation using a substation automation and control system (e.g. SICAM)
•
Automatic functions (e.g., using a binary input)
Switchgear with single and multiple busbars are supported. The number of switchgear devices to be controlled
is limited only by the number of binary inputs and outputs present. High security against inadvertent device
operations can be ensured if interlocking checks are enabled. A standard set of optional interlocking checks is
provided for each command issued to circuit breakers/switchgear.
Control Authorization
Type of Commands
Commands to the Process
These commands are directly output to the switchgear to change their process state:
•
Commands for the operation of circuit breakers (asynchronous; or synchronized through integration of
the synchronism check and closing control function) as well as commands for the control of isolators and
earth switches.
•
Step commands, e.g. for raising and lowering transformer taps,
•
Setpoint commands with configurable time settings, e.g. to control arc-suppression coils.
Device-internal Commands
These commands do not directly operate binary outputs. They serve for initiating internal functions, communi-
cating the detection of status changes to the device or for acknowledging them.
•
Manual override commands for “manual update”of information on process-dependent objects such as
annunciations and switching states, e.g. if the communication with the process is interrupted. Manually
overridden objects are marked as such in the information status and can be displayed accordingly.
•
Tagging commands (for “setting”) the information value of internal objects, such as switching authority
(remote/local), parameter changeovers, blocking of transmission and deletion/presetting of metered
values.
•
Acknowledgment and resetting commands for setting and resetting internal buffers or data stocks.
•
Information status commands to set/delete the additional “Information Status” item of a process object,
such as
– Acquisition blocking,
– Output blocking.
Sequence in the Command Path
Safety mechanisms in the command sequence ensure that a switch command can only be released after a
thorough check of preset criteria has been successfully concluded. Additionally, user-defined interlocking
conditions can be configured separately for each device. The actual execution of the command is also moni-
tored after its release. The entire sequence of a command is described briefly in the following list:
2.24
2.24.1
2.24.1.1
2.24.1.2
Functions
2.24 Command Processing
SIPROTEC 4, 7UT6x, Manual 303
C53000-G1176-C230-5, Edition 09.2016
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