Siemens 6MD85, Manual

Page: 337 / 1256

Table 6-17 Relationship Between Switching Mode and Command Checks
Command Check Switching Mode
Interlocked
Non-Interlocked
Switching authority Checked Checked
Switching direction (set=actual) Checked Checked
Fixed interlocking conditions Checked Checked
Interlocking conditions Checked Not checked
1-out-of-n check (double-activation
blocking) Checked Not checked
Blocking by protection function Checked Not checked
Switching Authority
The switching authority determines which command source is allowed. The following command sources are
possible:
•
Local:
A switching command from the local control (cause-of-error source Location) is possible only if the
switching authority is set to Local and the device is capable of local operation. Setting the switching
authority to Local is typically accomplished with key switch S5 (Local/Remote). In this case, commands
from all other sources are rejected. If the switching authority is set to Local, the setting cannot be
changed remotely.
•
DIGSI:
A switching command from DIGSI (connected via USB or Ethernet, cause-of-error source Maintenance) is
accepted only if the switching authority in the device is set to Remote. Once DIGSI has signed on the
device for command output, no commands from other command sources or a different DIGSI PC will be
executed.
•
Station:
This switching authority level can be activated via a parameter in the General function block. A switching
command from the station level (cause-of-error source Station or Automatic station) is accepted if the
switching authority is set to Remote and the controllable Station switching authority is set. This is
accomplished by a command from the substation automation technology. Switching commands from the
device or from outside the station (cause-of-error source Local, Remote or Automatic remote) are
rejected.
Full support of the this switching authority level is assured only when using the IEC 61850 protocol.
•
Remote:
This switching authority level stands from remote control directly from the network control center or (if
the switching authority level Station is not activated) generally for Remote control. The cause-of-error
source is Automatic remote. Commands from this level are accepted if the switching authority is set to
Remote and the controllable Station switching authority is not set. Switching commands from the
device or from the station (cause-of-error source Local, Station or Automatic station) are rejected.
Control Functions
6.3 Control Functionality
SIPROTEC 5, High-Voltage Bay Controller, Manual 337
C53000-G5040-C015-9, Edition 11.2017