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Functions
2.18 Breaker Control
2.18.2
Command Types
In conjunction with the power system control several command types can be distinguished for the device:
2.18.2.1 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 are issued to establish internal settings, e.g. deleting / presetting the switching authority
(remote vs. local), a parameter set changeover, data transmission block to the SCADA interface, and mea-
sured value setpoints.
• 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
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SIPROTEC, 7SD80, Manual
E50417-G1140-C474-A1, Release date 09.2011
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