Siemens SIPROTEC 6MD665, Manual

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2 Functions
24
6MD665 Manual
C53000-G1876-C103-3
Table 2-1 Interlocking Commands
1)
Not relevant for 6MD665
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 interlocking conditions are indi-
cated.
Figure 2-3 Example of configured interlocking conditions
Switching Authority (for devices with operator panel)
The interlocking condition "Switching Authority" serves to determine the switching
authorisation. It enables the user to select the authorized command source. For
devices with operator panel the following switching authority ranges are defined in the
following priority sequence:
• LOCAL
• DIGSI
®
• REMOTE
The object "Switching Authority" serves to interlock or enable LOCAL control, but not
remote or DIGSI commands. The 6MD665 is equipped with two key switches. The
top switch is reserved for the switching authority. The condition "LOCAL" allows com-
mands from the user interface of the relay. The position "REMOTE" enables remote
control.
The "Switching authority DIGSI" is used for interlocking and allows commands to be
initiated using DIGSI
®
. Commands are allowed for both a 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
removed.
Commands are checked for their source SC and the device settings, and compared
to the information set in the objects "Switching authority" and "Switching authority
DIGSI".
Interlocking Commands Command Display
Switching authority L L
System interlocking SI A
Zone Control Z Z
SET = ACTUAL (switch direction check) P P
Blocked by protection
1)
B
1)
B
1)