Siemens SIPROTEC 7SJ61 Manual page 252

Functions
2.18 Breaker Control
The following figure shows all interlocking conditions (which usually appear in the display of the device) for
three switchgear items with the relevant abbreviations explained in the previous table. All parameterized inter-
locking conditions are indicated.
Figure 2-85
Enabling Logic via CFC
For the bay interlocking an enabling logic can be structured using the CFC. Via specific release conditions the
information „released" or „bay interlocked" are available (e.g. object „52 Close" and „52 Open" with the data
values ON / OFF).
Switching Authority
The interlocking condition "Switching Authority" serves to determine the switching authorization. It enables the
user to select the authorized command source. The following switching authority zones are defined in the fol-
lowing priority sequence:
• LOCAL
• DIGSI
• REMOTE
The object "Switching Authority" serves to interlock or enable LOCAL control, but not REMOTE or DIGSI com-
mands. For the 7SJ61 the switching authority can be changed between "REMOTE" and "LOCAL" in the oper-
ator panel after having entered the password or by means of CFC also via binary input and function key.
The "Switching authority DIGSI" is used for interlocking and allows commands to be initiated using DIGSI.
Commands are allowed for both remote and a local DIGSI connection. When a (local or remote) DIGSI PC logs
on to the device, it enters its Virtual Device Number (VD). The device only accepts commands having that VD
(with switching authority = OFF or REMOTE). When the DIGSI PC logs off, the VD is cancelled.
Commands are checked for their source and the device settings, and compared to the information set in the
objects "Switching authority" and "Switching authority DIGSI".
Configuration
Switching authority available
Switching authority DIGSI available:
Specific Device (e.g. switching device)
Specific Device (e.g. switching device)
252
Example of configured interlocking conditions
y/n (create appropriate object)
y/n (create appropriate object)
Switching authority LOCAL (check for Local sta-
tus): y/n
"Switching authority REMOTE (check for
LOCAL, REMOTE, or DIGSI commands): y/n
C53000-G1140-C210-1, Release date 02.2008
SIPROTEC, 7SJ61, Manual