Command Processing - Siemens SIPROTEC 7SA522 Manual

2 Functions
2.22

Command processing

2.22.1 Control Authorization
2.22.1.1 Command Types
Commands to the
System
Device-internal
Commands
362
A control command process is integrated in the SIPROTEC
the operation of circuit breakers and other equipment in the power 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 via network control center or substation controller (e.g. SICAM
• Automatic functions (e.g. using a binary inputs, CFC).
The number of switchgear devices that can be controlled is basically limited by the
number of available and required binary inputs and outputs. For the output of control
commands it has to be ensured that all the required binary inputs and outputs are con-
figured and provided with the correct properties.
If specific interlocking conditions are needed for the execution of commands, the user
can program the device with bay interlocking by means of the user-defined logic func-
tions (CFC). The interlocking conditions of the system can be injected via the system
interface and must be allocated accordingly.
The procedure during switching operations is described in detail in the SIPROTEC
System Description, Order No. E50417-H1176-C151.
This type of commands are directly output to the switchgear to change their process
state:
• Commands for the operation of circuit breakers (asynchronous or synchronous
through integration of the 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,
• Set-point commands with configurable time settings, e.g. to control Petersen coils
These commands do not directly operate binary outputs. They serve for initiating in-
ternal functions, communicating the detection of status changes to the device or for
acknowledging them.
• 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 overidden objects are marked as such in the
information status and can be displayed accordingly.
• Flagging commands (for "setting") the data value of internal objects, e.g. switching
authority (remote/local), parameter switchovers, transmission blockages and dele-
tion and presetting of metered values.
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