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Functions
2.21 Command Processing
2.21.2
Command Types
In conjunction with the power system control several command types can be distinguished for the device:
2.21.2.1 Description
Commands to the Process
These are all commands that are directly output to the switchgear to change their process state:
• Switching commands for controlling the circuit breakers (not synchronized), disconnectors and ground elec-
trodes
• 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-dependent objects such as an-
nunciations and switching states, e.g. if the communication with the process is interrupted. Manually over-
ridden objects are flagged as such in the information status and can be displayed accordingly.
• Tagging commands (for "setting") of the information value of internal objects, for example switching authority
(remote/local), settings group switching, data transmission block and deleting/presetting metered values.
• Acknowledgment and resetting commands for setting and resetting internal buffers or data states.
• Information status command to set/reset the additional information "information status" of a process object,
such as:
– Input blocking
– Output blocking
288
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A5, Release date 11.2012
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