Types Of Commands; Description - Siemens SIPROTEC 7SJ61 Manual

Functions
2.18 Breaker Control
2.18.2

Types of Commands

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

2.18.2.1 Description

Commands to the System
These are all commands that are directly output to the switchgear to change their process state:
• Switching commands for the control of circuit breakers (not synchronized), disconnectors and ground elec-
trode,
• Step Commands, e.g. raising and lowering transformer LTCs
• Setpoint 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 indi-
cations and switching states, e.g. if the communication with the process is interrupted. Manually overridden
objects are flagged as such in the information status and can be displayed accordingly.
• Tagging commands (for "Setting") for internal object information values, e.g. deleting / presetting switching
authority (remote vs. local), parameter set changeovers, data transmission blockage and metered values.
• Acknowledgment and resetting commands for setting and resetting internal buffers or data states.
• Information status command to set/reset the additional "information status" of a process object, such as:
– Input blocking
– Output Blocking
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SIPROTEC, 7SJ61, Manual
C53000-G1140-C210-1, Release date 02.2008