Command Processing; Control Authorization; Command Types - Siemens siprotec 7SD5 User Manual

2 Functions
2.25

Command Processing

A control command process is integrated in the SIPROTEC
operation of circuit breakers and other equipment in the power system. Control com-
mands 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 for switching resources is described in the SIPROTEC
scription under Control of Switchgear.

2.25.1 Control Authorization

2.25.1.1 Command Types

Commands to the This type of commands are directly output to the switchgear to change their process
System state:
• Commands for the operation of circuit breakers (asynchronous; or synchronized
• Step commands, e.g. for raising and lowering transformer taps,
• Setpoint commands with configurable time settings, e.g. to control Petersen coils.
Device-internal These commands do not directly operate binary outputs. They serve for initiating in-
Commands ternal functions, communicating the detection of status changes to the device or for
acknowledging them.
• Manual override commands for „manual update" of information on process-depen-
• Flagging commands (for „setting") the data value of internal objects, e.g. switching
436
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through integration of the synchronism check and closing control function) as well
as commands for the control of isolators and earth switches.
dent objects such as annunciations 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.
authority (remote/local), parameter switchovers, transmission blockages and dele-
tion and presetting of metered values.
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7SD5 Manual
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