Command Types; Description - Siemens SIPROTEC 7SK80 Manual

2.19.2

Command Types

In conjunction with the power system control several command types can be distinguished for the device:

2.19.2.1 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
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A4, Release date 08.2010
Functions
2.19 Breaker Control
271